Aerostar Van/Wagon – Bronco – Econoline/Club Wagon – Explorer – F-Series – Ranger (1992 – 1997)

ModelYearEngine identificationSystem
Aerostar Van/Wagon 3.0/4.0L1992·95VIN position 8 = U/XFord EEC-IV
Bronco 5.0/5.8L1992·95VIN position 8 = H/N/RFord EEC-IV
Econoline/Club Wagon 4.9/5.0/5.8/7.5L1992·95VIN position 8 = G/H/N/R/Y/ZFord EEC-IV
Econoline/Club Wagon 5.8/7.5L(without 16 pin DLC)1996VIN position 8 = G/HFord EEC-IV
Explorer 4.0L1992·95VIN position 8 = XFord EEC-IV
F-Series 4.9/5.0/5.8/7.5L1992·95VIN position 8 = G/H/N/R/YFord EEC-IV
F-Series 5.8/7.5L (without 16 pin DLC)1996·97VIN position 8 = G/HFord EEC-IV
Ranger 2.3/3.0/4.0L1992·94VIN position 8 = A/U/XFord EEC-IV

General information

  • Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.
  • Trouble codes can be displayed by the MIL or by using an analogue voltmeter or Scan Tool connected to the data link connectors (DLC) 1 and 2:
    • Aerostar 1
    • Bronco/F-Series 2
    • Econoline/Club Wagon 3
    • Explorer 4
    • Ranger 5

Preparatory conditions

  1. Automatic transmission in “PARK”.
  2. All auxiliary equipment, including air conditioning, switched OFF.

Accessing -Key On Engine Off (KOEO) test

Using malfunction indicator lamp (MIL)

  • Start engine.
  • Allow to idle until engine at normal operating temperature.
  • Switch ignition OFF.
  • Wait 10 seconds.
  • If engine does not start or stalls: Continue with KOEO test.
  • If fitted: Remove ‘EEC TEST’ cover to access data link connector (DLC).
  • 4.9L MT: Depress clutch pedal for entire accessing procedure.
  • Jump DLC 1 terminal (STI) to DLC 2 terminal 2 (SIG RTN) 6.
  • Switch ignition ON .

NOTE: MIL may flash briefly while fast DTCs are issued for Scan Tool followed by slow DTC output.

  • Count MIL flashes. Note trouble codes. Compare with trouble code table.
  • Each trouble code is displayed twice. Firstly for present faults followed by those for memorized faults as follows:
    • Trouble codes are displayed by illuminated MIL switching OFF.
    • Each trouble code consists of two or three digits.
    • A group of 0.5 second flashes indicate each digit 7 [A].
    • A 0.5 second pause separates each flash 7[B].
    • A 2 second pause separates each trouble code digit 7 [C].
    • A 4 second pause separates each trouble code 7 [D].
For example: Three digit trouble code 122 displayed 7. Throttle position (TP) sensor.

NOTE: Two digit trouble codes displayed in a similar pattern.

  1. A 6-9 second pause [8] [B] indicates the end of trouble code output for present faults [8] [A] .
  2. A 0.5 second flash (separator code) [8] [C], followed by a 6-9 second pause [8] [D] indicates the start of trouble code output for memorized faults [8] [E].
  3. Trouble codes for memorized faults displayed in the same manner as those for present faults.

NOTE: Memorized trouble codes refer to faults that have occurred in the last 80 warm-up cycle.

  • Switch ignition OFF.
  • Remove jump lead.
  • 4.9L MT: Release clutch pedal.
  • Trouble codes can also be displayed by using a Scan Tool connected to the data link connectors (DLC) 1 and 2.

Using analogue voltmeter

  • Ensure ignition switched OFF.
  • If fitted: Remove ‘EEC TEST’ cover to access data link connector (DLC).
  • Connect an analogue voltmeter between data link connector (DLC) 2 terminal 4 (STO) and battery (12 volt) positive 9.
  • Set analogue voltmeter to a DC voltage range of 0-20 V.
  • Start engine.
  • Allow to idle until engine at normal operating temperature.
  • Switch ignition OFF.
  • Wait 10 seconds.
  • If engine does not start or stalls: Continue with KOEO test.
  • 4.9L MT: Depress clutch pedal for entire accessing procedure.
  • Jump DLC 1 terminal (STI) to DLC 2 terminal 2 (SIG RTN) 1iJ.
  • Switch ignition ON.

NOTE: Voltmeter needle may briefly deflect while fast OTCs are issued for Scan Tool followed by slow OTC output.

  • Count voltmeter needle deflections. Note trouble codes. Compare with trouble code table.
  • Each trouble code is displayed twice. Firstly for present faults followed by those for memorized faults as follows:
    • Trouble codes are displayed by voltmeter needle deflecting to zero.
    • Each trouble code consists of two or three digits .
    • A group of 0.5 second needle deflections indicate each digit 7 [A].
    • A 0.5 second pause separates each needle deflection 7 [B].
    • A 2 second pause separates each trouble code digit 7 [C].
    • A 4 second pause separates each trouble code 7 [D].
    • For example: Three digit trouble code 122 displayed 7. Throttle position (TP) sensor.
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NOTE: Two digit trouble codes displayed in a similar pattern.

  • A 6-9 second pause [8] [B] indicates the end of trouble code output for present faults [8] [A].
  • A 0.5 second needle deflection (separator code) [8] [e]. followed by a 6-9 second pause [8] [0] indicates the start of trouble code output for memorized faults [8] [E].
  • Trouble codes for memorized faults displayed in the same manner as those for present faults.

NOTE: Memorized trouble codes refer to faults that have occurred in the last 80 warm-up cycles.

  • Switch ignition OFF.
  • Remove jump lead and voltmeter.
  • 4.9L MT: Release clutch pedal.
  • Trouble codes can also be displayed by using a Scan Tool connected to the data link connectors (DLC) 1 and 2.

Accessing -Key On Engine Running (KOER) test

Using malfunction indicator lamp (MIL)

  • Start engine.
  • Allow to idle until engine at normal operating temperature.
  • Increase engine speed to over 2000 rpm for 2 minutes.
  • Switch ignition OFF.
  • Wait 10 seconds.
  • If fitted: Remove ‘EEC TEST’ cover to access data link connector (DLC).
  • Jump DLC 1 terminal (STI) to DLC 2 terminal 2 (SIG RTN) 6.
  • Start engine.
  • Engine identification code displayed as follows:
    • 4 cylinder: Two 0.5 second flashes.
    • 6 cylinder: Three 0.5 second flashes.
    • 8 cylinder: Four 0.5 second flashes.
    • For example: 6 cylinder engine identified 10[A].
  • With PSP switch: Within 1-2 seconds, tum steering wheel at least Y. a tum and release.
  • With BPP switch: Oepress and release brake pedal.
  • If fitted: Operate overdrive selection switch twice.
  • If after 6-20 seconds 10 [B], a single 0.5 second flash is displayed (dynamic response signal) 10 [C]: Briefly fully open throttle.

NOTE: DO NOT fully open throttle during KOER test if no dynamic response signal is displayed.

  • Trouble codes displayed for present faults after 4-15 second pause [10] [D].
  • Fast OTCs are issued for Scan Tool during 4-15 second pause [10] [E].
  • Count MIL flashes. Note trouble codes. Compare with trouble code table.

NOTE: Each trouble code is displayed twice.

  • Trouble codes for KOER test are displayed in the same manner as those for KOEO test [10] [F].
  • For example: Three digit trouble code 111 is displayed [10] . No fault found.
  • Switch ignition OFF.
  • Remove jump lead.
  • Trouble codes can also be displayed by using a Scan Tool connected to the data link connectors (DLC) 1 and 2.
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Using analogue voltmeter

  • Ensure ignition switched OFF.
  • If fitted: Remove ‘EEC TEST’ cover to access data link connector (DLC).
  • Connect an analogue voltmeter between data link connector (DLC) 2 terminal 4 (STO) and battery (12 volt) positive 9.
  • Set analogue voltmeter to a OC voltage range of 0-20 V.
  • Start engine.
  • Allow to idle until engine at normal operating temperature.
  • Increase engine speed to over 2000 rpm for 2 minutes.
  • Switch ignition OFF.
  • Wait 10 seconds.
  • Jump DLC 1 terminal (STI) to DLC 2 terminal 2 (SIG RTN) 9
  • Start engine.
  • Engine identification code displayed as follows:
    • 4 cylinder: Two 0.5 second needle deflections.
    • 6 cylinder: Three 0.5 second needle deflections.
    • 8 cylinder: Four 0.5 second needle deflections

For example: 6 cylinder engine identified 10 [A].

  • With PSP switch: Within 1-2 seconds, turn steering wheel at least Y, a turn and release.
  • With BPP switch: Depress and release brake pedal.
  • If fitted: Operate overdrive selection switch twice.
  • If after 6-20 seconds [10] [B], a single 0.5 second needle deflection is displayed (dynamic response signal) IE tel: Briefly fully open throttle.

NOTE: DO NOT fully open throttle during KOER test if no dynamic response signal is displayed.

  • Trouble codes displayed for present faults after 4-15 second pause [10] [D).
  • Fast OTCs are issued for Scan Tool during 4-15 second pause [10] [E).
  • Count needle deflections. Note trouble codes. Compare with trouble code table.

NOTE: Each trouble code is displayed twice.

  • Trouble codes for KOER test are displayed in the same manner as those for KOEO test 10 [F).
  • For example: Three digit trouble code 111 is displayed [10] . No fault found .
  • Switch ignition OFF.
  • Remove jump lead and voltmeter.
  • Trouble codes can also be displayed by using a Scan Tool connected to the data link connectors (DLC) 1 and 2.

Erasing

NOTE: Disconnecting battery ground lead may cause driveabi/ity problems until the engine management system relearns basic values.

Using malfunction indicator lamp (MIL)

  • Ensure ignition switched OFF.
  • If fitted: Remove “EEC TEST” cover to access data link connector (DLC).
  • Jump DLC 1 terminal (STI) to DLC 2 terminal 2 (SIG RTN) 6.
  • Switch ignition ON.
  • When trouble codes start to be displayed: Remove jump lead.
  • Switch ignition OFF.
  • Repeat accessing procedure to ensure no memorized trouble codes remain in ECM fault memory.
  • Trouble codes can also be erased by using a Scan Tool connected to the data link connectors (DLC) 1 and 2.
  • If emission related component(s) have been replaced:
    1. Disconnect battery ground cable for at least 5 minutes to erase adaptive memory from ECM.
    2. If required: Drive vehicle for 10 miles or more to allow ECM to relearn basic values.

NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio.

Using analogue voltmeter

  • Ensure ignition switched OFF.
  • If fitted: Remove “EEC TEST” cover to access data link connector (DLC).
  • Connect an analogue voltmeter between data link connector (DLC) 2 terminal 4 (STO) and battery (12 volt) positive 9.
  • Set analogue voltmeter to a DC voltage range of 0-20 V.
  • Jump DLC 1 terminal (STI) to DLC 2 terminal 2 (SIG RTN) 9.
  • Switch ignition ON .
  • When trouble codes start to be displayed: Remove jump lead.
  • Switch ignition OFF.
    • Repeat accessing procedure to ensure no
    • memorized trouble codes remain in ECM fault memory.
  • Trouble codes can also be erased by using a Scan Tool connected to the data link connectors (DLC) 1 and 2.
  • If emission related component(s) have been replaced:
    1. Disconnect battery ground cable for at least 5 minutes to erase adaptive memory from ECM.
    2. If required: Drive vehicle for 10 miles or more to allow ECM to relearn basic values.

NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio.

Trouble code  identification

Flash codeFault locationProbable cause
11No fault found
12Idle speed, high RPM check -unable to controlduring KOER testIntake system, throttle tight/sticking, lAC valve/lSC actuator, ECM
13Idle speed, low RPM check -unable to control during KOER testIntake system, throttle tight/sticking, lAC valve/lSC actuator, ECM
14Engine speed (RPM) sensor/profile ignition pickup(PIP) circuit -intermittent signalIncorrectly installed RPM sensor, wiring, poor connection, electrical interference, RPM sensor,ECM
15Engine control module (ECM) -KAM/ROM faultBattery disconnected, wiring, fuses, ECM
16Engine RPM too low for heated oxygen sensor (H02S) testIntake system, throttle tight/sticking, lAC valve/lSC actuator, ECM
Ignition diagnostic monitor (IDM) circuit no signal during KOEO testWiring, ICM, ECM
18Spark output (SPOUT) circuit openWiring, ICM, ECM
Ignition diagnostic monitor (IDM) circuit/spark output (SPOUT) circuit groundedWiring, ICM, ECM
19Engine control module (ECM) -intemal voltagefaultECM
21Engine coolant temperature (ECT) sensorincorrect signalWiring, ECT sensor, ECM
22Manifold absolute pressure (MAP) sensor/ barometric pressure (BARO) sensor -incorrect signalVacuum hose damaged, trapped vacuum, high atmospheric pressure, excessive EGR, wiring, MAP!BARO sensor, ECM
23Throttle position (TP) sensor -incorrect signalThrottle valve tight/sticking, wiring, TP sensor, ECM
24Intake air temperature (IAT) sensor incorrectsignalWiring, IAT sensor, ECM
25Knock sensor (KS) no signal during dynamic response testWiring, KS, ECM
26 HMass air flow (MAF) sensor -incorrect signalIntake leak/blockage, wiring, MAF sensor, ECM
260 DTransmission fluid temperature (TFT) sensors,ignal highllowATF level, wiring, TFT sensor, ECM
29Vehicle speed signal -incorrect signalWiring, rear ABS system, vehicle speed interface module, ECM
31Exhaust gas recirculation (EGR) valve position sensor below minimum voltageWiring short circuit to ground, EGR valve/ position sensor, ECM
32Exhaust gas recirculation (EGR) valve position sensor below closed limitWiring short circuit to ground, EGR valve! position sensor, ECM
33Exhaust gas recirculation (EGR) valve not openingWiring, EGR valve tight/sticking, ECM
34Exhaust gas recirculation (EGR) valve position sensor above closed limitWiring short circuit to positive, EGR valve! position sensor, ECM
35Exhaust gas recirculation (EGR) valve position sensor above maximum voltageWiring short circuit to positive, EGR valvel position sensor, ECM
41Heated oxygen sensor (H02S), bank 1 mixture leanlnot switchingIntake leak, fuel pressure low, fuel filterl pump, injectors, H02S, AIR system, MAF/MAP sensor, ECM
42Heated oxygen sensor (H02S), bank 1 mixture rich/not switchingIntake blocked, excessive fuel in engine oil, fuel pressure high, breather system, injectors, H02S, AIR system, EVAP system, MAF/MAP sensor, ignitionsystem, ECM
43Throttle position (TP) sensor -incorrect signal at idleIncorrectly adjusted, TP sensor, ECM
44Secondary air injection (AIR) system, bank 1 inoperativeHose connection, wiring, AIR pump motor, AIR solenoid, ECM
45Secondary air injection (AIR) -upstream during KOER testHose connection, wiring, AIR solenoid, ECM
46Secondary air injection (AIR) -not bypassed during KOER testHose connection, wiring, AIR solenoid, ECM
47Four wheel drive selector switch -closed during KOEO testWiring short circuit, four wheel drive selector switch, internal damage to transfer case, ECM
490Gear shift, 1·2 -malfunctionATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
51Engine coolant temperature (ECT) sensor open circuitWiring open circuit, ECT sensor, ECM
52Power steering pressure (PSP) switch -open circuiVno signal changeWiring open circuit, PSP switch, ECM
53Throttle position (TP) sensor -above maximum voltageTP sensor loose, wiring short circuit to positive, TP sensor, ECM
54Intake air temperature (IAT) sensor -open circuitWiring open circuit, IAT sensor, ECM
56 HMass air flow (MAF) sensor -above maximum voltageWiring short circuit to positive, MAF sensor, ECM
560 DTransmission fluid temperature (TFT) sensor-above maximum voltageATF level, wiring open circuit, TFT sensor, ECM
590Gear shift, 2·3 -malfunctionATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
61Engine coolant temperature (ECT) sensor short circuit to groundWiring short circuit to ground, ECT sensor, ECM
620Torque converter clutch (TCC) -excessive clutch slipATF level/condition, TCC slipping, ECM
63Throttle position (TP) sensor -below minimum voltageTP sensor loose, wiring open circuit/short circuit to ground, TP sensor, ECM
64Intake air temperature (IAT) sensor -short circuit to groundWiring short circuit to ground, IAT sensor, ECM
650Overdrive selection switch -no signal change during KOEO testIncorrect switch operation, wiring, fuse, overdrive selection switch, ECM
66 HMass air flow (MAF) sensor -below minimum voltageWiring short circuit to ground, MAF sensor, ECM
66 0 DTransmission fluid temperature (TFT) sensorbelow minimum voltageATF level, wiring short circuit to ground, TFT sensor, ECM
67Neutral position (NP) switch -open circuitIncorrect adjustment, wiring open circuit, NP switch, ECM
Clutch pedal position (CPP) switch -circuit malfunctionIncorrect adjustment, wiring, CPP switch, ECM
AlC on during KOEO testWiring, AlC switch, ECM
670Transmission range (TR) sensor -voltage high/ lowIncorrect adjustment, wiring, TR sensor, ECM
680Automatic transmission flu id (ATF) temperature highATF level, transmission cooling system, towing weight limit exceeded, clutch slipping, wiring, TFT sensor, ECM
690Gear shift, 3-4 -malfunctionATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
72Manifold absolute pressure (MAP) sensor/mass air flow (MAF) sensor -incorrect signal change during dynamic response testIntake leak, wiring, MAP sensor, ECM
73Throttle position (TP) sensor -incorrect signal change during dynamic response testIncorrect throttle operation, wiring, TP sensor, ECM
74Brake pedal position (BPP) switch -open circuit/no signal change during KOER testIncorrect brake pedal operation, wiring, BPP switch, ECM
75Brake pedal position (BPP) switch -closed circuitWiring, BPP switch, ECM
77Wide open throttle (WOT) switch -no signal change during dynamic response testIncorrect throttle operation, wiring, WOT switch,ECM
79AlC on during KOEO testWiring, AlC switch, ECM
81Secondary air injection (AIR) divert solenoid -circuit malfunction during KOEO testWiring, AIR divert solenoid, ECM
82Secondary air injection (AIR) bypass solenoid -circuit malfunction during KOEO testWiring, AIR bypass solenoid, ECM
84Exhaust gas recirculation (EGR) solenoid -circuit malfunction during KOEO testWiring, EGR solenoid, ECM
85Evaporative emission (EVAP) canister purge valve-circuit malfunction during KOEO testWiring, EVAP canister purge valve, ECM
86AT -shift solenoidWiring, shift solenoid, ECM
87Fuel pump, primary circuit -circuit malfunctionIF5 switch, wiring, fuel pump, ECM
89Torque converter clutch (TCC) lock-up solenoidWiring, TCC lock-up solenoid, ECM
91Heated oxygen sensor (H02S), bank 2 mixture lean/not switching during KOER testIntake leak, fuel pressure low, fuel filter/ pump,injectors, H025, AIR system, MAF/MAP sensor,ECM
91 0Shift solenoid (SS) 1 -circuit malfunction during KOEO testWiring, 55, ECM
92Heated oxygen sensor (H02S), bank 1 mixture rich/not switching during KOER testIntake blocked, excessive fuel in engine oil, fuel pressure high, breather system, injectors, H025, AIR system, EVAP system, MAF/MAP sensor, ignition system, ECM
920Shift solenoid (SS) 2 -circuit malfunction during KOEO testWiring, 55, ECM
930Transmission coast clutch solenoid -circuit malfunction during KOEO testWiring, transmission coast clutch solenoid, ECM
94Secondary air injection (AIR) system. bank 2inoperative during KOER testHose connection, wiring, AIR pump motor, AIR solenoid, ECM
940Torque converter clutch (TCC) solenoid -circuitmalfunction during KOEO testWiring, TCC solenoid, ECM
95Fuel pump. secondary circuit -circuit malfunctionIFS switch, wiring, fuel pump, ECM
96Fuel pump. secondary circuit -circuit malfunctionIFS switch, wiring open circuit to battery, fuel pump, ECM
970Overdrive indicator lamp -circuit malfunctionBulb, wiring, fuse, ECM
98Engine control module (ECM) -hard fault detected during KOER testH025 bank 2 -indicates lean, ECM
980Engine control module (ECM). transmission fluidpressure (TFP) control -open driver circuit during KOEO testECM
99Engine control module (ECM) -idle speed notlearnt during KOER testIdle speed adjusted, ECM
990Transmission fluid pressure (TFP) solenoid -circuit malfunction during KOEO testWiring, poor connection, TFP solenoid, ECM
111No fault found
112Intake air temperature (IAT) sensor belowminimum voltageWiring short circuit to ground, poor connection, IAT sensor, ECM
113Intake air temperature (IAT) sensor -abovemaximum voltageWiring open circuit, poor connection, IAT sensor, ECM
114Intake air temperature (IAT) sensor incorrect signalAir temperature below 10°C (50°F), poor connection, IAT sensor, ECM
116Engine coolant temperature (ECT) sensor incorrect signalCoolant level low, poor connection, ECT sensor, ECM
117Engine coolant temperature (ECT) sensor below minimum voltageWiring short circuit to ground, poor connection, ECT sensor, ECM
118Engine coolant temperature (ECT) sensor above maximum voltageWiring open circuit, poor connection, IAT sensor, ECM
121Throttle position (TP) sensor -closed throttle voltage high/lowThrottle valve tight/sticking, TP sensor loosel damaged, ECM
Throttle position (TP) sensor -voltage inconsistent with MAF sensor signalThrottle valve tight/sticking, TP sensor loosel damaged, ECM
122Throttle position (TP) sensor -below minimumvoltageTP sensor loose, wiring open circuit/short circuit to ground, TP sensor, ECM
123Throttle position (TP) sensor -above maximumvoltageTP sensor loose, wiring short circuit to positive, TP sensor, ECM
124Throttle position (TP) sensor -voltage highThrottle tight/sticking, intake leak, MAP/BARO sensor, ECM
125Throttle position (TP) sensor -voltage lowThrottle tight/sticking, intake leak, MAP/BARO sensor, ECM
126Manifold absolute pressure (MAP) sensor/barometric pressure (BARO) sensor -voltage highllowVacuum hose damaged/trapped, high atmospheric pressure, excessive EGR, wiring, MAP/BARO sensor, ECM
128Manifold absolute pressure (MAP) sensor -loss of vacuumVacuum hose damaged/disconnected, MAP sensor, ECM
129Manifold absolute pressure (MAP) sensorinsufficient voltage change during KOER dynamicresponse testIncorrect throttle operation, vacuum hose damaged/disconnected, MAP sensor, lAC system,ECM
Mass air flow (MAF) sensor -insufficient voltagechange during KOER dynamic response testIncorrect throttle operation, intake leak, wiring,MAF sensor, lAC system, ECM
136Heated oxygen sensor (H02S), bank 2 mixture lean during KOER testIntake leak, fuel pressure low, fuel filter/pump,injectors, H02S, AIR system, MAP sensor, ECM
137Heated oxygen sensor (H02S), bank 2 mixture richduring KOER testIntake blocked, excessive fuel in engine oil, fuel pressure high, breather system, injectors, H02S,AIR system, EVAP system, MAP sensor, ignitionsystem, ECM
138Cold start injector -insufficient flow during KOERtestFuel pressure, wiring, cold start injector, ECM
139Heated oxygen sensor (H02S), bank 2 -not switchingIntake leak/blocked, injectors, H02S, AIR system,breather system, EVAP system, MAP sensor,ignition system, ECM
141Fuel system indicates leanIntake leak, fuel pressure low, fuel filter/pump,injectors, H02S, ECM
144Heated oxygen sensor (H02S), bank 1 not switchingIntake leak/blocked, injectors, H02S, AIR system,breather system, EVAP system, MAP sensor,ignition system, ECM
157Mass air flow (MAF) sensor -below minimum voltageWiring short circuit to ground, poor connection,MAF sensor, lAC system, ECM
158Mass air flow (MAF) sensor -above maximumvoltageWiring short circuit to positive, MAF sensor screen blocked, MAF sensor, ECM
159 0Mass air flow (MAF) sensor -voltage highllowIntake leak, lAC valve, MAF sensor, ECM
167Throttle position (TP) sensor -insufficient voltagechange during KOER dynamic response testIncorrect throttle operation, TP sensor, ECM
171Fuel system control, bank 1 -adaptive limitsreachedIntake leak/blocked, breather system, fuel pressure, fuel filter/pump, injectors, H02S, AIR system, EVAP system, MAP sensor, ignition system, ECM
172Heated oxygen sensor (H02S), bank 1 mixture leanIntake leak, fuel pressure low, fuel filter/pump, injectors, H02S, AIR system, MAP sensor, ECM
173Heated oxygen sensor (H02S), bank 1 mixture richIntake blocked, excessive fuel in engine oil, fuel pressure high, breather system, injectors, H02S, AIR system, EVAP system, MAP sensor, ignition system, ECM
174Heated oxygen sensor (H02S), bank 1 -slow responseIntake leak, excessive fuel in engine oil, fuel pressure, fuel filter/pump, injectors, H02S, AIR system, MAF/MAP sensor, ECM
175Fuel system control, bank 2 -adaptive limits reachedIntake leak/blocked, excessive fuel in engine oil, breather system, fuel pressure, fuel filter/ pump, injectors, H02S, AIR system, EVAP system, MAP sensor, ignition system, ECM
176Heated oxygen sensor (H02S), bank 2 mixture leanIntake leak, fuel pressure low, fuel filter/pump, injectors, H02S, AIR system, MAP sensor, ECM
177Heated oxygen sensor (H02S), bank 2 mixture richIntake blocked, fuel pressure high, breather system, injectors, H02S, AIR system, EVAP system, MAP sensor, ignition system, ECM
178Heated oxygen sensor (H02S), bank 2 -slow responseIntake leak, excessive fuel in engine oil, fuel pressure, fuel filter/pump, injectors, H02S, AIR system, MAF/MAP sensor, ECM
179Fuel control system, bank 1 -lean adaption limit reached at part throttle, mixture richIntake leak, fuel pressure low, fuel filter blocked, wiring, injector, MAP sensor, ECM
181Fuel control system, bank 1 -rich adaption limit reached at part throttle, mixture leanIntake blocked, fuel pressure high, wiring, injector,MAP sensor, ECM
182Fuel control system, bank 1 -lean adaption limit reached at idle, mixture richIntake leak, fuel pressure low, fuel filter blocked,wiring, injector, MAP sensor, ECM
183Fuel control system, bank 1 -rich adaption limit reached at idle, mixture leanIntake blocked, fuel pressure high, wiring, injector, MAP sensor, ECM
184Mass air flow (MAF) sensor -signal highMAF sensor screen blocked, MAF sensor, ECM
185Mass air flow (MAF) sensor -signal lowIntake leak, breather system, MAF sensor, ECM
186Injector -pulse width long/mass air flow (MAF)sensor signal lowIntake leak, fuel pressure low, MAF sensor, ECM
187Injector -pulse width short/mass air flow (MAF) sensor signal highIntake blocked, fuel pressure high, MAF sensor, ECM
188Fuel system control, bank 2 -lean adaption limit reached at part throttle, mixture richIntake leak, fuel pressure low, fuel filter blocked,wiring, injector, MAP sensor, ECM
189Fuel system control, bank 2 -rich adaption limit reached at part throttle, mixture leanIntake blocked, fuel pressure high, wiring, injector, MAP sensor, ECM
191Fuel system control, bank 2 -lean adaption limit reached at idle, mixture richIntake leak, fuel pressure low, fuel filter blocked, wiring, injector, MAP sensor, ECM
192Fuel system control, bank 2 -rich adaption limit reached at idle, mixture leanIntake blocked, fuel pressure high, wiring, injector,MAP sensor, ECM
193Fuel quality sensor -circuit malfunctionWiring, fuel separation, fuel quality sensor, ECM
194Cylinder balance test -malfunctionWiring, injector, ECM
195Cylinder balance test -malfunctionWiring, injector, ECM
211Profile ignition pickup (PIP) -circuit malfunctionWiring, poor connection, arcing secondary ignition component coil/cap/rotor/HT leads/ plugs, electrical interference, ECM
212Ignition control module (ICM) -ignition diagnostic monitor (10M) signal missingWiring, ICM, ECM
213Spark output (SPOUT) -open circuitWiring, ICM, ECM
214 fJCamshaft position (CMP) sensor -circuit malfunctionWiring, CMP sensor, ICM, ECM
214 DCrankshaft position (CKP) sensor, CIO signal -circuit malfunctionWiring, CKP sensor, ICM, ECM
215Ignition coil 1 -primary circuit malfunctionWiring, ignition coil, ICM, ECM
216Ignition coil 2 -primary circuit malfunctionWiring, ignition coil, ICM, ECM
217Ignition coil 3 -primary circuit malfunctionWiring, ignition coil, ICM, ECM
218Ignition diagnostic monitor (10M), left side signal miSSingWiring, ignition coil, ECM
219Ignition timing, defaulted to 10° -spark output (SPOUT) circuit openWiring open circuit, ICM, ECM
221Ignition timing errorWiring, ICM, ECM
222Ignition diagnostic monitor (10M), right side signal missingWiring, ignition coil, ECM
223Loss of dual plug inhibit (OPI) controlWiring, ICM, ECM
224Ignition coil 1, 2, 3 or 4 -primary circuit malfunctionWiring, ignition coil, ICM, ECM
225Knock sensor (KS) -no signal during KOER dynamic response testWiring, KS, ECM
226Ignition control module (ICM) -ignition diagnostic monitor (10M) signal missingWiring open circuit, ICM, ECM
232Ignition coil 1! 2, 3 or 4 -primary circuit malfunctionWiring, ignition coil, ICM, ECM
238Ignition coil 4 -primary circuit malfunctionWiring, ignition coil, ICM, ECM
241Ignitfon control module (ICM) -ignition diagnostic monitor (10M) signal malfunctionWiring, ICM, ECM
244Cylinder identification (CIO) fault when cylinder balance test requestedWiring, CKP sensor, CMP sensor, ICM, ECM
311Secondary air injection (AIR) system, bank 1inoperative during KOER testHose blockedlleaking, AIR bypass/divert solenoid,AIR pump, ECM
312Secondary air injection (AIR) system misdirected during KOER testHose connections
313Secondary air injection (AIR) system not bypassed during KOER testHose blocked/leaking, AIR bypass solenoid, AIR pump
314Secondary air injection (AIR) system, bank 2 inoperative during KOER testHose blockedlleaking, AIR bypass/divert solenoid, AIR pump, ECM
326Exhaust gas pressure sensor -voltage lowHose blockedlleaking, wiring, exhaust gas pressure sensor, ECM
327 DExhaust gas recirculation (EGR) valve position sensor minimum voltage exceededWiring open circuit/short circuit to ground, EGR valve/position sensor, ECM
327 ~Exhaust gas pressure sensor -minimum voltage exceededHose blockedlleaking, wiring open circuit/ short circuit to ground, exhaust gas pressure sensor, ECM
328Exhaust gas recirculation (EGR) valve position sensor, closed position -voltage lowWiring, EGR valve/position sensor, ECM
332 DExhaust gas recirculation (EGR) systeminsufficient flow detectedHose blocked/leaking, wiring, EGR solenoid filter, EGR solenoid, EGR valve/position sensor, ECM
332 DExhaust gas recirculation (EGR) systeminsufficient flow detectedHose blockedlleaking, EGR solenoid, exhaust gas pressure sensor, EGR valve, ECM
334Exhaust gas recirculation (EGR) valve positionsensor, closed position -voltage highWiring, EGR valve/position sensor, EGR solenoid, ECM
3350Exhaust gas pressure sensor -voltage high/lowduring KOEO testExhaust gas pressure sensor, blocked inlet hose, ECM
336Exhaust gas pressure sensor -voltage highExhaust system restricted, wiring, EGR solenoid, exhaust gas pressure sensor, EGR valve, hose routing, ECM
337 DExhaust gas recirculation (EGR) position sensor above maximum voltageWiring open circuit/short circuit to positive, EGR valve/position sensor, ECM
337 ~Exhaust gas pressure sensor -above maximum voltage (Incorrect hose routing, wiring short circuit, signal wire open circuit, exhaust gas pressure sensor, EGR solenoid/valve, ECM
338Engine coolant temperature (ECT) -too lowThermostat stuck open, coolant leak, ECM
339Engine coolant temperature (ECT) -too highCoolant level low, thermostat stuck closed, coolingsystem blocked, coolant blower motor worn/damaged, water pump defective, coolant leak,ECM
341Octane adjuster -open circuitWiring, octane adjuster, ECM
381AlC compressor clutch -excessive cyclingAlC system incorrectly charged, cycling switchdefective, AlC circuit fault, wiring intermittent open circuit to AlC system, ECM
411Idle air control (lAC) valve no control during KOER low RPM checkIdle speed adjustment, intake leak, throttle valve tight/sticking, ignition timing incorrect, wiring short circuit to ground, lAC valve, ECM
412Idle air control (lAC) valve no control during KOER high RPM checkIdle speed adjustment, throttle valve tight/ sticking, wiring open circuit/short circuit to ground, lAC valve, ECM
415Idle air control (lAC) valve -lower limit reachedIntake leak, throttle valve tight/sticking, lAC valve, ECM
416Idle air control (lAC) valve -upper limit reachedAir filter blocked, throttle body dirty/damaged, lAC valve, ECM
452 [8]Vehicle speed signal -incorrect signalWiring, rear ABS system, vehicle speed interface module, ECM
4520Vehicle speed sensor (VSS) -incorrect signalWiring, VSS, ECM
453Servo leaking down -cruise control KOER testServo defective, ECM
454Servo leaking up -cruise control KOER testServo defective, ECM
455Insufficient RPM increase -cruise control KOER testIntake system, ECM
456Insufficient RPM decrease -cruise control KOER testIntake system, ECM
457Cruise control master/selector switch -circuit malfunction during KOEO testWiring, cruise control master/selector switch, ECM
458Cruise control master/selector switch -short circuit to ground during KOEO testWiring short circuit to ground, cruise control master/selector switch, ECM
459Cruise control system -ground open circuit during KOEO testWiring open circuit, ECM
511Engine control module (ECM) -ROM fault during KOEO testECM
512Engine control module (ECM) -KAM faultBattery disconnected, wiring, fuses, ECM
513Engine control module (ECM) -internal voltage faultECM
519Power steering pressure (PSP) switch -open circuit during KOEO testPSP switch not fitted -disregard trouble code, wiring open circuit, PSP switch, ECM
521Power steering pressure (PSP) switch -no signal change during KOEO testPSP switch not fitted -disregard trouble code,wiring, PSP switch, ECM
522 IlJPark/neutral position (PNP) switch/neutral position (NP) switch -not in parklneutral during KOEO test/open circuitIncorrect gear lever position, incorrect adjustment,wiring open circuit, starter motor relay disconnected, PNP/NP switch, ECM
Transmission range (TR) sensor not in parkl neutral during KOEO testIncorrect shift lever position, incorrect adjustment,wiring, TR sensor, ECM
524Fuel pump (FP) -engine does not startWiring open circuit, fuel pump (FP) relay, ECM
Fuel pump (FP) -engine startsLeft/front H02S short circuit to positive, ECM
525Vehicle in gear during KOEO testIncorrect shift lever position, incorrect adjustment, PNP switch open, ECM
AlC -ON during KOEO testAlC ON, AlC wiring short circuit to positive, ECM
526Neutral position (NP) switch -switch closed circuit during KOEO testWiring short circuit, NP switch, ECM
AlC -ON during KOEO testAlC ON, AlC wiring short circuit to positive, AlC switch, ECM
527 IlJPark/neutral position (PNP) switch/neutral position switch -open circuit during KOEO testWiring open circuit, starter motor relay disconnected, PNP/NP switch, ECM
AlC -ON during KOEO testAlC ON, AlC wiring short circuit to positive, AlC switch, ECM
528Clutch pedal position (CPP) switch -circuit malfunctionWiring open circuit, CPP switch, ECM
529Data link/engine control module (ECM) -circuit malfunctionWiring, ECM
532Instrument panel -circuit malfunctionWiring, instrument panel, ECM
533Data link/instrument panel -circuit malfunctionWiring, instrument panel, ECM
536Brake pedal position (BPP) switch -circuit malfunction/no signal change during KOER testIncorrect brake pedal operation, wiring, BPP switch, ECM
538 f)KOER dynamic response test -insufficient rpmchangeIncorrect throttle operation, ECM
KOER cylinder balance test -invalid testThrottle operated during test, CMP sensor, ECM
538 IDKOER dynamic response test -insufficient rpm changeIncorrect throttle operation, ECM
KOERcylinder balance test -invalid testThrottle operated during test, CKP sensor CID signal, ECM
539AlC -ON during KOEO testWiring, AlC switch, ECM
542Fuel pump (FP) secondary circuit -engine does not startIFS switch, supply wire open circuit, FP ground wire, FP, ECM
Fuel pump (FP) secondary circuit -engine startsSupply wire short circuit to positive, FP relay, FP to ECM wire open circuit, left/front H02S short circuit to positive, ECM
543Fuel pump (FP) secondary circuit -engine does not startSupply wire open circuit, fuel pump relay, ECM
Fuel pump (FP) secondary circuit -engine startsLeft/front H02S short circuit to positive, ECM
551Idle air control (lAC) valve -circuit malfunction during KOEO testWiring, lAC valve, ECM
552Secondary air injection (AIR) bypass solenoid -circuit malfunction during KOEO testWiring, AIR bypass solenoid, ECM
553Secondary air injection (AIR) divert solenoid circuit malfunction during KOEO testWiring, AIR divert solenoid, ECM
554Fuel pressure control solenoid -circuit malfunctionHose connection, wiring, fuel pressure control solenoid, ECM
556Fuel pump (FP) primary circuitIFS switch, wiring, fuel pump relay, constant control relay module, ECM
557Fuel pump (FP) primary circuit, low speedWiring, FP relay/constant control relay module, ECM
558Exhaust gas recirculation (EGR) solenoid :circuit malfunction during KOEO testHose damaged, wiring, EGR solenoid, ECM
559AlC relay, primary circuit -circuit malfunctionWiring, AlC relay, ECM
562Engine coolant blower motor relay -circuit malfunctionWiring, engine coolant blower motor relay, ECM
563Engine coolant blower motor relay, high speed -circuit malfunctionWiring, engine coolant blower motor relay/ constant control relay module, ECM
564Engine coolant blower motor relay, low speedcircuit malfunctionWiring, engine coolant blower motor relayl constant control relay module, ECM
565Evaporative emission (EVAP) canister purge valve 1 -malfunctionHose damaged, wiring, EVAP canister purge valve, ECM
566 IlJShift solenoid (SS) 3-4 -circuit malfunctionWiring, 55, ECM
567Cruise control vent valve -circuit malfunctionWiring, cruise control vent valve, ECM
568Cruise control vacuum valve -circuit malfunctionWiring, cruise control vacuum valve, ECM
569Evaporative emission (EVAP) canister purge valve 2 -malfunctionHose damaged, wiring, EVAP canister purge valve, ECM
571Exhaust gas recirculation (EGR) atmospheric solenoid -circuit malfunction during KOEOWiring, EGR atmospheric solenoid, ECM
572Exhaust gas recirculation (EGR) vacuum solenoid -circuit malfunction during KOEOWiring, EGR vacuum solenoid, ECM
578AlC pressure sensor -short circuitSupply wire short ground, AlC pressure sensor, variable control relay module, ECM
579AlC pressure sensor -insufficient pressure changeWiring, AlC fault, AlC pressure sensor, variable control relay module, wiring to AlC compressor clutch open circuit, ECM
581Engine coolant blower motor -excessive current drawWiring short circuit to ground, engine coolantblower motor, variable control relay module, ECM
582Engine coolant blower motor -open circuit! short circuit to positiveSupply wire open circuit/short circuit to positive, ground wire open circuit, engine coolant blower motor, variable control relay module, ECM
583Fuel pump -excessive current drawWiring short circuit to ground, fuel pump, ECM
584Variable control relay module -ground open circuitWiring open circuit, variable control relay module, ECM
585AlC compressor clutch -excessive current drawWiring short circuit to ground, AlC compressor clutch, variable control relay module, ECM
586AlC compressor clutch -open circuit!short circuit to positiveWiring open circuit/short circuit to positive, AlC compressor clutch, variable control relay module, ECM
587Variable control relay module -communicationerrorWiring, variable control relay module, ECM
593Heated oxygen sensor (H02S) -heater circuit malfunctionWiring, H02S heater relay, H02S, ECM
617 IlJGear shift, 1-2 -malfunctionATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
618 IlJGear shift, 2-3 -malfunctionATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
619 IlJGear shift, 3-4 -malfunctionATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
621 [8]Shift solenoid (SS) 1 -circuit malfunction duringKOEOWiring, 55, ECM
622 [8]Shift solenoid (SS) 2 -circuit malfunction during KOEOWiring, 55, ECM
623 [8]Overdrive indicator lamp -circuit malfunctionBulb, wiring, fuse, ECM
624 [8]Transmission fluid pressure (TFP) solenoid -circuit malfunctionWiring, poor connection, TFP solenoid, ECM
625 [8]Engine control module (ECM), TFP control open driver circuitECM
626 [8]Transmission coast clutch solenoid -circuitmalfunction during KOEO testWiring, transmission coast clutch solenoid, ECM
627 [8]Torque converter clutch (TCC) solenoid -circuit malfunctionWiring, TCC solenoid, ECM
628 [8]Torque converter clutch (TCC) -excessive clutch slipATF level/condition, TCC slipping, ECM
629 [8]Torque converter clutch (TCC) solenoid -circuitmalfunctionWiring, TCC solenoid, ECM
631 [8]Overdrive indicator lamp -circuit malfunction during KOEO testBulb, wiring, fuse, ECM
632 [8]Overdrive selection switch -no signal change during KOEO testIncorrect switch operation, wiring, fuse, overdrive selection switch, ECM
633Four wheel drive selector switch -closed during KOEO testWiring short circuit, four wheel drive selector switch, internal damage to transfer case, ECM
634 [8]Transmission range (TR) sensor -voltage high/ lowIncorrect adjustment, wiring, TR sensor, ECM
636 [8]Transmission fluid temperature (TFT) sensor signal highllowATF level, wiring, TFT sensor, ECM
637 [8]Transmission fluid temperature (TFT) sensorabove maximum voltageATF level, wiring open circuit, TFT sensor, ECM
638 [8]Transmission fluid temperature (TFT) sensor below minimum voltageATF level, wiring short circuit to ground, TFT sensor, ECM
639 [8]Turbine shaft speed (TSS) sensor/output shaft speed (OSS) sensor -signal lowWiring, T55/055 sensor, ECM
641 [8]Shift solenoid (SS) 3 -circuit malfunction during KOEOWiring, 55, ECM
643 [8]Torque converter clutch (TCC) solenoid -circuit malfunction during KOEO testWiring, TCC solenoid, ECM
645 [8]Incorrect gear ratio, 1 st gearATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
646 [8]Incorrect gear ratio, 2nd gearATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
647 [8]Incorrect gear ratio, 3rd gearATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
648 [8]Incorrect gear ratio, 4th gearATF level/condition, poor connection, wiring, TR sensor, 55, clutch slipping, ECM
649 [8]Transmission fluid pressure (TFP) solenoid -signal highllowWiring, poor connection, TFP solenoid, ECM
651 (jJTransmission fluid pressure (TFP) solenoid -circuit malfunctionWiring, poor connection, TFP solenoid, ECM
652 (jJTorque converter clutch (TCC) solenoid -circuit malfunctionWiring, TCC solenoid, ECM
653 (jJOverdrive selection switch -no signal change during KOEO testIncorrect switch operation, wiring, fuse, overdrive selection switch, ECM
654 (jJTransmission range (TR) sensor -“P” signal during KOEO testTransmission not in “P” during KOEO test, incorrect adjustment, ECM
655 (jJTransmission range (TR) sensor -“N” signal during KOEO testTransmission not in “N” during KOEO test, incorrect adjustment, ECM
656 (jJTorque converter clutch (TCC) -continuous clutch slipATF level/condition, TCC slipping, ECM
657 [8]Automatic transmission fluid (ATF) temperature highATF level, transmission cooling system, towing weight limit exceeded, clutch slipping, wiring, TFT sensor, ECM
659 (jJHigh vehicle speed – transmission in “P”TR sensor/PNP switch, ECM
667 (jJTransmission range (TR) sensor -below minimum voltageWiring open circuit/short circuit to ground, TR sensor, ECM
668 [8]Transmission range (TR) sensor -above maximum voltageWiring open circuit/short circuit to positive, TR sensor, ECM
675 (jJTransmission range (TR) sensor -out of rangeWiring, TR sensor, ECM
691Four wheel drive selector fault -incorrect engine RPM/vehicle speedWiring short circuit, four wheel drive selector switch, internal damage to transfer case, ECM
692 [8]Transmission state does not match calculated ratioTransmission fault, ECM
998Engine control module (ECM) -hard fault presentECM