Engine Controls - Self-Diagnostics: Other Jaguar XKR I

OBD-II

The ECM monitors system operation using inputs from various sensors and stores Diagnostic Trouble Codes (DTCs) to aid in fault diagnosis. System requires either one or two drive cycles before a DTC is stored. With the exception of catalyst efficiency, all inputs and outputs will have been checked by the end of an appropriate drive cycle. The catalyst monitoring test requires 3 drive cycles, which include a period of steady driving.

Malfunction Indicator Light (MIL)

For most DTCs, the Check Engine Indicator (located in the lower portion of the tachometer) will illuminate when a fault is detected on the second drive cycle. (Scheme 30) Only catalyst-damaging misfires, certain internal ECM failures and Controller Area Network (CAN) faults will illuminate the Check Engine Indicator when the fault is detected on the first drive cycle. In certain circumstances, the Message Center (located in the lower portion of the speedometer), will display fault warning information simultaneously with the Check Engine Indicator, or when a fault is detected on the first drive cycle. Also, in certain circumstances, the Amber or Red MIL (located above the Message Center) simultaneously with the Check Engine Indicator and Message center indicating the priority of the fault.

Red MIL indicates a primary warning, loss of power and driveability. Do not drive vehicle. Amber MIL indicates a secondary warning, loss of power and driveability. Vehicle may still be driven.

Scheme 30

Hard Failures

If any warning lights and/or messages were displayed when the fault occurred, refer to RETRIEVING DIAGNOSTIC TROUBLE CODES for retrieving DTC information. Some warnings will appear to clear when the ignition is cycled. This is often because the warning has flagged as a result of one of the vehicle's drive cycles having run to detect the fault. If the same drive cycle has not run when the ignition was switched on, the warning will not reflag until the drive cycle does run. See DRIVE CYCLES .

Intermittent Failures

If the DTC flagged was not present for 2 or more consecutive drive cycles, it is classed as temporary, and will be deleted following 3 drive cycles in which no fault was present. This could result in a reported warning light/message with no stored DTCs. If a fault is present for 3 consecutive drive cycles, the DTC becomes permanent, and will remain in the module's memory for 40 drive cycles. A cycle is an ignition ON/OFF, which will occur during the owner's normal use of the vehicle. No action on the part of the technician is necessary to perform this cycle. A drive cycle is a series of conditions needed to make the on-board diagnostic routine run, and may need a specific action on the part of the technician. See DRIVE CYCLES .

CONDITIONS REQUIRING PROGRAMMING

Whenever the battery is disconnected, the Engine Control Module (ECM) adaptations are reset to a "Green" ECM condition. In this condition, certain functions of the ECM are inhibited, and the ECM must relearn these functions. To enable the ECM to do this, the vehicle will have to perform some maneuvers which it may or may not do during a normal road test. This routine should be carried out at Pre-Delivery Inspection, and after any emissions related repair work involving the disconnection of the battery.

CONDITIONS FOR REPROGRAMMING

Make sure the following conditions are checked and corrected, as necessary, before performing reprogramming procedure

1. Engine oil level.
2. Coolant level.
3. Fuel level greater than 30 percent but less than 80 percent.
4. Fuel filler cap seal is in good condition and cap is correctly fitted and secure.
5. All repair work relating to DTCs completed.
6. Fuel, ignition and cooling systems are in good order.
7. All Diagnostic Trouble Codes (DTCs) cleared.
8. All repair work relating to DTCs completed.
9. Fuses, harnesses and electrical connectors are in good order.

PROGRAMMING DRIVE CYCLE (FUELLING ADAPTATIONS)

Note. Ensure engine is at normal operating temperature.

Using the Jaguar Portable Diagnostic Unit (PDU) scan tool or a generic scan tool connected to the 16-pin Data Link Connector (DLC), measure the mass air flow rate (most generic scan tools should be capable of reading this parameter). See PROGRAMMING DRIVE CYCLE table. Depending on road conditions and dealer location, it may be difficult to achieve the road speeds necessary to reach the air flow indicated. It is possible to reach these air flow figures by inducing a load on the vehicle (making use of hills, using a lower gear ratio, etc.) or, if no alternative is possible, by restraining the vehicle and reaching the air flow figure stationery in Drive.

Programming Drive Cycle

DRIVE CYCLES

Note. The following drive cycles will enable the monitors to run, but only after fuelling adaptations are complete. During the drive cycle, drive gently, avoiding hard acceleration, braking or cornering and rough roads.

1. Entry conditions: Catalyst Monitor Engine speed is 1100-1600 RPM, vehicle speed is 31-45 MPH and MAF is 5-30 grams/second. All conditions for 23 seconds. HO2S Engine speed is 600-2500 RPM, vehicle speed is 18-70 MPH and MAF is 4-16 grams/second. Fuel cut for more than 10 seconds, but less than 30 seconds. Catalyst Monitor Sensor MAF is 10-90 grams/second for 140 seconds. Fuel System Greater than 6 grams/second for 33 seconds. Air Assist Close Valve Vehicle speed is 38-75 MPH and MAF is 4-16 grams/second. Fuel is cut for 2 seconds. P/N Switch Engine speed is 1800-2200 RPM and vehicle speed is 50-63 MPH for 31 seconds. Evaporative Emissions Vehicle speed is 30-55 MPH and at idle. For MAF readings and time frames, see «DRIVE CYCLE LEAK TEST»(ref-11917-S05410378492004060700000) .
2. Drive at 52-60 MPH for 40 seconds. Accelerate to 70 MPH. Close the throttle (ideally at the start of a decel) continue with closed throttle for 10 seconds (fuel cut). Drive at 35-40 MPH, holding the throttle as steady as possible, on a flat level road for a minimum of 30 seconds.

SUMMARY

If no hard trouble codes (or only pass codes) are present, driveability symptoms exist or intermittent Diagnostic Trouble Codes (DTCs) exist, see TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedure.

Monitoring Conditions

Drive vehicle. Accelerate quickly to cruise, decelerate to stop. Repeat several times.

System Default Action

When Check Engine Indicator is activated (DTC sets on second trip with fault present), ECM sets VVT drive Pulse Width Modulated (PWM) duty cycle to zero (intake camshaft fully retarded).

Possible Causes

1. VVT solenoid valve to ECM PWM drive circuit fault.
2. VVT solenoid valve to ECM ground circuit fault.
3. VVT solenoid failure.

Drive vehicle. Accelerate quickly to cruise, decelerate to stop. Repeat several times.

When Check Engine Indicator is activated (DTC sets on second trip with fault present), ECM sets VVT drive Pulse Width Modulated (PWM) duty cycle to zero (intake camshaft fully retarded).

1. VVT solenoid valve to ECM PWM drive circuit fault.
2. VVT solenoid valve to ECM ground circuit fault.
3. VVT solenoid failure.

1. Engine at normal operating temperature.
2. Idle for 3 minutes.

ECM default

1. Bank 1 close loop fuel metering and adaptive fuel metering inhibited.
2. Canister purge inhibited.
3. Bank 1 upstream HO2S heater control circuit switched off.

1. HO2S heater power supply circuit open.
2. HO2S heater control circuit open or high resistance.
3. HO2S heater failure.

Ignition on for more than 5 seconds.

ECM default

1. Bank 1 close loop fuel metering and adaptive fuel metering inhibited.
2. Canister purge inhibited.
3. Bank 1 upstream HO2S heater control circuit switched off.

1. HO2S heater control circuit shorted to ground.
2. HO2S heater failure.

1. Engine at normal operating temperature.
2. Idle for 3 minutes.

None.

1. HO2S heater control circuit shorted to ground.
2. HO2S heater failure.

1. Engine at normal operating temperature.
2. Idle for 3 minutes.

None.

1. HO2S heater control circuit open or shorted to ground.
2. HO2S heater failure.

1. Engine at normal operating temperature.
2. Idle for 3 minutes.

ECM default

1. Bank 2 close loop fuel metering and adaptive fuel metering inhibited.
2. Canister purge inhibited.
3. Bank 2 upstream HO2S heater control circuit switched off.

1. HO2S heater power supply circuit open.
2. HO2S heater control circuit open or high resistance.
3. HO2S heater failure.

Ignition on for more than 5 seconds.

ECM default

1. Bank 2 close loop fuel metering and adaptive fuel metering inhibited.
2. Canister purge inhibited.
3. Bank 2 upstream HO2S heater control circuit switched off.

1. HO2S heater control circuit shorted to ground.
2. HO2S heater failure.

1. Engine at normal operating temperature.
2. Idle for 3 minutes.

None.

1. HO2S heater control circuit shorted to ground.
2. HO2S heater failure.

1. Engine at normal operating temperature.
2. Idle for 3 minutes.

None.

1. HO2S heater control circuit open or high resistance.
2. HO2S heater failure.

1. Engine at normal operating temperature. Intake Air Temperature (IAT) more than 18°F (-8°C)
2. Drive and accelerate to 60 MPH, release the accelerator and coast to 37 MPH. Engine RPM 1000-3000 RPM during coast.

None.

1. Air assist piping blocked.
2. Throttle body air channel blocked.
3. AACV stuck.

Engine coolant temperature ambient, start engine and bring to normal operating temperature.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits AACV range/performance diagnostic monitoring.

1. AACV power circuit failure.
2. AACV ground circuit fault.
3. AACV to ECM pulse width modulation drive circuit open, shorted or high resistance.
4. AACV failure.

1. Engine at normal operating temperature.
2. Vehicle driven at a steady speed (43-59 MPH) on a level road with engine speed at 1500-2500 RPM for more than 10 seconds.
3. Fuel level more than 10 percent capacity. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Will substitute throttle angle for engine load measurement.
2. Limit engine speed to 3000 RPM.
3. Inhibit canister purge.

1. Blocked air cleaner.
2. Air intake leak.
3. Engine breather leak.
4. Throttle control malfunction.
5. MAF sensor to ECM sensing circuit high resistance.
6. MAF sensor to ECM sensing circuit intermittent short to ground.
7. MAF sensor supply circuit high resistance.
8. MAF sensor failure.

Ignition on for more than 5 seconds.

When Amber MIL is activated (DTC logged; first trip), ECM will

1. Substitute throttle angle for engine load measurement.
2. Limit engine speed to 3000 RPM.
3. Inhibit canister purge.

1. Blocked air cleaner.
2. MAF sensor to ECM sensing circuit high resistance or open circuit.
3. MAF sensor to ECM sensing circuit intermittent short to ground.
4. MAF sensor supply circuit open or shorted to ground.
5. MAF sensor failure.

Ignition on for more than 5 seconds.

When Amber MIL is activated (DTC logged; first trip), ECM will

1. Substitute throttle angle for engine load measurement.
2. Limit engine speed to 3000 RPM.
3. Inhibit canister purge.

1. MAF sensor to ECM reference ground circuit open.
2. MAF sensor to ECM sensing circuit short circuit to voltage.
3. MAF sensor failure.

Ignition on for more than 5 seconds.

When DTC is logged (first trip), ECM substitutes fixed value of 29.92 in. Hg (1013 mbar).

1. MAP sensor to ECM circuit(s) fault.
2. MAP sensor failure.

Engine running at idle for more than 5 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM substitutes fixed value of 29.92 in. Hg (1013 mbar).

Possible Cause

BARO failure (internal ECM fault).

1. Ignition on for more than 5 seconds.
2. Vehicle driven with engine speed more than 1000 RPM. Engine Coolant Temperature (ECT) is less than 104°F (40°C). Conditions present for more than 20 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM substitutes fixed temperature of 122°F (50°C).

1. Blocked air cleaner.
2. Air intake leak.
3. Engine breather leak.
4. IAT senor to ECM wiring open or high resistance.
5. IAT sensor to ECM sensing circuit shorted to voltage.
6. IAT sensor failure.

Ignition on for more than 5 seconds.

When DTC is logged (first trip), ECM substitutes fixed temperature of 122°F (50°C).

1. IAT sensor to ECM wiring open or high resistance.
2. IAT sensor to ECM sensing circuit shorted to voltage.
3. IAT sensor failure.

Ignition on for more than 5 seconds.

When DTC is logged (first trip), ECM substitutes fixed temperature of 122°F (50°C).

1. IAT sensor to ECM wiring shorted to ground.
2. IAT sensor failure.

1. Ignition on for more than 5 seconds.
2. ECT ambient and Intake Air Temperature (IAT) more than 18°F (-8°C). Start engine and bring to normal operating temperature. Drive vehicle with engine speed more than 1500 RPM. Conditions present for more than 3 minutes.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Substitutes transmission fluid temperature via Controller Area Network (CAN).
2. Limits engine speed to 3000 RPM.
3. Inhibits canister purge.

1. Low coolant level.
2. Contaminated coolant.
3. Engine thermostat failure.
4. ECT sensor to ECM sensing circuit high resistance when hot.
5. ECT sensor to ECM sensing circuit intermittent high resistance.
6. ECT sensor failure.

Ignition on for more than 5 seconds.

When Amber MIL is activated (DTC logged; first trip), ECM

1. Substitutes transmission fluid temperature via Controller Area Network (CAN).
2. Limits engine speed to 3000 RPM.
3. Inhibits canister purge.

1. ECT sensor disconnected.
2. ECT sensor to ECM sensing circuit high resistance, open or shorted to voltage.
3. ECT sensor failure.

Ignition on for more than 5 seconds.

When Amber MIL is activated (DTC logged; first trip), ECM

1. Substitutes transmission fluid temperature via Controller Area Network (CAN).
2. Limits engine speed to 3000 RPM.
3. Inhibits canister purge.

1. Engine overheating condition.
2. ECT sensor to ECM wiring short circuit to ground.
3. ECT sensor failure.

1. Ignition on.
2. Battery voltage more than 9 volts.
3. Slowly move throttle through full range.
4. Conditions present for more than 40 seconds.

When Red MIL is activated DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. TPS to ECM wiring open or high resistance.
2. TPS to ECM sensing circuits 1 or 2 shorted to voltage.
3. TPS failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. TPS to ECM sensing circuit 1 (TPS terminal No. 3) open or high resistance.
2. TPS failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. TPS to ECM sensing circuit 1 (TPS terminal No. 3) open or high resistance.
2. TPS failure.

ECT ambient and Intake Air Temperature (IAT) more than 18°F (-8°C). Start engine and bring to normal operating temperature. Drive vehicle with engine speed more than 1500 RPM. Conditions present for more than 3 minutes.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Substitutes transmission fluid temperature via Controller Area Network (CAN).
2. Limits engine speed to 3000 RPM.
3. Inhibits canister purge.

1. Low coolant level.
2. Contaminated coolant.
3. Engine thermostat failure.
4. ECT sensor to ECM sensing circuit high resistance when hot.
5. ECT sensor to ECM sensing circuit intermittent high resistance.

Engine Coolant Temperature (ECT) 18-104°F (-8-40°C). Intake Air Temperature (IAT) more than 18°F (-8°C). Engine running at idle.

None.

1. Contaminated coolant.
2. Engine coolant thermostat failure.
3. ECT sensor failure (ECT DTCs are also set).

Start and run engine for more than 5 seconds.

None.

1. HO2S disconnected.
2. HO2S to ECM variable current circuit fault (HO2S pin No. 3).
3. ECM to HO2S constant current circuit fault (HO2S pin No. 4).
4. HO2S failure.

Start and run engine for more than 5 seconds.

None.

1. HO2S disconnected.
2. HO2S to ECM variable current circuit fault (HO2S pin No. 3).
3. ECM to HO2S constant current circuit fault (HO2S pin No. 4).
4. HO2S failure.

Engine at normal operating temperature. IAT more than 18°F (-8°C). Vehicle driven at 37-59 MPH. Engine speed 1500-2000 RPM for more than 30 seconds. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Inhibits Bank 1 closed loop fuel metering.
2. Inhibits Bank 1 adaptive fuel metering.
3. Inhibits Bank 1 downstream HO2S control.

1. Engine misfire.
2. HO2S disconnected.
3. HO2S mechanical damage.
4. HO2S to ECM wiring fault.
5. HO2S short circuit to ground.
6. HO2S to ECM variable current circuit shielding open.
7. HO2S heater circuit fault.
8. Exhaust leak.
9. Low exhaust temperature.
10. Injector flow partially blocked.
11. Catalyst efficiency decrease.
12. HO2S failure.

Ignition on for more than 5 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Inhibits Bank 1 closed loop fuel metering.
2. Inhibits Bank 1 adaptive fuel metering.
3. Inhibits Bank 1 downstream HO2S control.

1. HO2S disconnected.
2. HO2S heater power supply circuit open.
3. HO2S heater circuit to ECM wiring shorted or open.
4. HO2S heater failure.

Start and run engine for more than 5 seconds.

None.

1. HO2S disconnected.
2. HO2S to ECM wiring open.
3. HO2S shorted to ground.
4. HO2S failure.

1. Start engine and bring to normal operating temperature.
2. Intake Air Temperature (IAT) more than 18°F (-8°C).
3. Engine running for more than one minute.

None.

1. HO2S sensing circuit shorted to voltage.
2. HO2S ground (braided shield) open circuit.
3. HO2S failure.

1. Engine at normal operating temperature.
2. Vehicle driven at more than 40 MPH.
3. Conditions present for more than 2 minutes 30 seconds.

None.

1. HO2S disconnected.
2. HO2S mechanical damage.
3. HO2S to ECM wiring open.
4. HO2S sensing circuit shorted to voltage.
5. HO2S shorted to ground.
6. HO2S ground (braided shield) open.
7. Exhaust leak.
8. Low exhaust temperature.
9. HO2S failure.

Ignition on for more than 5 seconds.

None.

1. HO2S disconnected.
2. HO2S mechanical damage.
3. HO2S to ECM wiring fault.
4. HO2S heater failure.

Start and run engine for more than 5 seconds.

None.

1. HO2S disconnected.
2. HO2S to ECM variable current circuit fault (HO2S pin No. 3).
3. ECM to HO2S constant current circuit fault (HO2S pin No. 4).
4. HO2S failure.

Start and run engine for more than 5 seconds.

None.

1. HO2S disconnected.
2. HO2S to ECM variable current circuit fault (HO2S pin No. 3).
3. ECM to HO2S constant current circuit fault (HO2S pin No. 4).
4. HO2S failure.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at 37-59 MPH. Engine speed 1500-2000 RPM for more than 30 seconds.
3. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Inhibits Bank 2 closed loop fuel metering.
2. Inhibits Bank 2 adaptive fuel metering.
3. Inhibits Bank 2 downstream HO2S control.

1. Engine misfire.
2. HO2S disconnected.
3. HO2S mechanical damage.
4. HO2S to ECM wiring fault.
5. HO2S shorted to ground.
6. HO2S to ECM variable current circuit shielding open.
7. HO2S heater circuit fault.
8. Exhaust leak.
9. Low exhaust temperature.
10. Injector flow partially blocked.
11. Catalyst efficiency decrease.
12. HO2S failure.

Ignition on for more than 5 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Inhibits Bank 2 closed loop fuel metering.
2. Inhibits Bank 2 adaptive fuel metering.
3. Inhibits Bank 2 downstream HO2S control.

1. HO2S disconnected.
2. HO2S to ECM wiring open.
3. HO2S shorted to ground.
4. HO2S heater failure.

Start and run engine for more than 5 seconds.

None.

1. HO2S disconnected.
2. HO2S to ECM wiring open.
3. HO2S shorted to ground.
4. HO2S failure.

1. Start engine and bring to normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Engine running for more than one minute.

None.

1. HO2S sensing circuit shorted to voltage.
2. HO2S ground (braided shield) open.
3. HO2S failure.

1. Engine at normal operating temperature.
2. Vehicle driven at more than 40 MPH.
3. Conditions present for more than 2 minutes 30 seconds.

None.

1. HO2S disconnected.
2. HO2S mechanical damage.
3. HO2S to ECM wiring open.
4. HO2S sensing circuit shorted to voltage.
5. HO2S shorted to ground.
6. HO2S ground (braided shield) open.
7. Exhaust leak.
8. Low exhaust temperature.
9. HO2S failure.

Ignition on for more than 5 seconds.

None.

1. HO2S Disconnected.
2. HO2S mechanical damage.
3. HO2S to ECM wiring fault.
4. HO2S heater failure.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at a steady speed of more than 40 MPH.
3. Conditions present for more than one minute.

When Check Engine indicator is activated (DTC flagged; second trip), ECM inhibits downstream HO2S control. If DTC P0174 is also set, ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits canister purge (when lean fault is first detected).

1. Engine misfire.
2. Air intake leak between MAF sensor and throttle.
3. Fuel filter or fuel system blockage.
4. Fuel injector blockage.
5. Fuel pressure regulator failure (low fuel pressure).
6. Low fuel pump output.
7. HO2S wiring harness condition fault.
8. Exhaust leak before catalyst.
9. ECM receiving incorrect signal from one or more of the following components: ECT sensor, MAF sensor, IAT sensor or TPS.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at a steady speed of more than 40 MPH.
3. Conditions present for more than one minute.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits downstream HO2S control. If DTC P0175 is also set, ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits canister purge.

1. Blocked air filter.
2. Fuel system return blockage.
3. Leaking fuel injector(s).
4. Fuel pressure regulator failure (high fuel pressure).
5. ECM receiving incorrect signal from one or more the following components: ECT sensor, MAF sensor, IAT sensor or TPS.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at a steady speed of more than 40 MPH.
3. Conditions present for more than one minute.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits downstream HO2S control. If DTC P0171 is also set, ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits canister purge (when lean fault is first detected).

1. Engine misfire.
2. Air intake leak between MAF sensor and throttle.
3. Fuel filter or fuel system blockage.
4. Fuel injector blockage.
5. Fuel pressure regulator failure (low fuel pressure).
6. Low fuel pump output.
7. HO2S wiring harness condition fault.
8. Exhaust leak before catalyst.
9. ECM receiving incorrect signal from one or more of the following components: ECT sensor, MAF sensor, IAT sensor or TPS.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at a steady speed of more than 40 MPH.
3. Conditions present for more than one minute.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits downstream HO2S control. If DTC P0172 is also set, ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits canister purge.

1. Blocked air filter.
2. Fuel system return blockage.
3. Leaking fuel injector(s).
4. Fuel pressure regulator failure (high fuel pressure).
5. ECM receiving incorrect signal from one or more the following components: ECT sensor, MAF sensor, IAT sensor or TPS.

1. EOT sensor and ECT sensor ambient. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at a steady speed of more than 40 MPH.
3. Conditions present for more than one minute.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM substitutes ECT value.

1. EOT sensor to ECM sensing circuit high resistance when hot.
2. EOT sensor to ECM sensing circuit intermittent high resistance.
3. EOT sensor failure.

Ignition on for more than 5 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM substitutes ECT value.

1. EOT sensor to ECM wiring shorted to ground.
2. EOT sensor failure.

Ignition on for more than 5 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM substitutes ECT value.

1. EOT sensor disconnected.
2. EOT sensor to ECM sensing circuit high resistance, open or shorted to voltage.
3. EOT sensor failure.

Start engine and bring to normal operating temperature. Vary engine speed between idle and 2500 RPM more than 10 times.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM limits engine speed to 3000 RPM, inhibits canister purge. If DTCs for all Bank 1 injectors are set, ECM

1. Inhibits Bank 1 closed loop fuel metering (P0201-P0204). Inhibits Bank 2 closed loop fuel metering (P0205-P0208).
2. Inhibits Bank 1 adaptive fuel metering (P0201-P0204). Inhibits Bank 2 adaptive fuel metering (P0205-P0208).
3. Inhibits Bank 1 downstream HO2S control (P0201-P0204). Inhibits Bank 2 downstream HO2S control (P0205-P0208).

1. Injector disconnected.
2. Injector harness wiring open or shorted.
3. Injector failure.

Ignition for more than 5 seconds.

When Red MIL is activated (DTC flagged; second trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode.
3. Engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders.
4. Inhibits idle speed control.
5. Inhibits cruise control and inhibits traction control/stability control.

1. TPS to ECM sensing circuit 2 (TPS pin No. 2) open circuit or high resistance.
2. TPS failure.

Ignition for more than 5 seconds.

When Red MIL is activated (DTC flagged; second trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode.
3. Engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders.
4. Inhibits idle speed control.
5. Inhibits cruise control and inhibits traction control/stability control.

1. TPS to ECM sensing circuit 2 (TPS pin No. 2) shorted to voltage.
2. TPS failure.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at steady speed between idle and 2500 RPM.
3. Conditions present for more than 2 minutes 30 seconds. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits Bank closed loop fuel metering.
3. Inhibits adaptive fuel metering.
4. Inhibits canister purge.

1. Cylinder compression low.
2. Worn camshaft/broken valve spring(s).
3. Fuel delivery pressure low or high.
4. Fuel injector(s) blocked or leaking.
5. Fuel injector(s) continuously open.
6. Fuel contamination.
7. Fuel injector circuit fault(s). Injector DTCs is also flagged.
8. Spark plug failure, fouled or incorrect gap.
9. ECM to ignition module primary circuit fault (cylinder misfire DTC is also set).
10. Ignition module ground circuit open or high resistance.
11. Ignition module or coil failure.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at steady speed between idle and 2500 RPM.
3. Conditions present for more than 2 minutes 30 seconds. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits Bank 1closed loop fuel metering (P0301-P0304) and inhibits Bank 2 closed loop fuel metering (P0305-P0308).
3. Inhibits Bank 1adaptive fuel metering (P0301-P0304) and inhibits Bank 2 adaptive fuel metering (P0305-P0308).
4. Inhibits canister purge.

1. Cylinder compression low.
2. Worn camshaft/broken valve spring(s).
3. Fuel delivery pressure low or high.
4. Fuel injector(s) blocked or leaking.
5. Fuel injector(s) continuously open.
6. Fuel contamination.
7. Fuel injector circuit fault(s). Injector DTCs are also flagged.
8. Spark plug failure, fouled or incorrect gap.
9. ECM to ignition module primary circuit fault (cylinder misfire DTC is also set).
10. Ignition module ground circuit open or high resistance.
11. Ignition module or coil failure.

Start engine and run for more than 5 seconds.

When DTC is logged (first trip), ECM sets ignition retard to maximum and limits engine speed to 3000 RPM.

1. Poor sensor contact with the cylinder block.
2. KS to ECM sensing circuit shorted to ground.
3. KS failure.

Start engine and run for more than 5 seconds.

When DTC is logged (first trip), ECM sets ignition retard to maximum and limits engine speed to 3000 RPM.

1. Poor sensor contact with the cylinder block.
2. KS to ECM sensing circuit open or high resistance.
3. KS to ECM sensing circuit shorted to voltage.
4. KS failure.

Start engine and run for more than 5 seconds.

When DTC is logged (first trip), ECM sets ignition retard to maximum and limits engine speed to 3000 RPM.

1. Poor sensor contact with the cylinder block.
2. KS to ECM sensing circuit shorted to ground.
3. KS failure.

Start engine and run for more than 5 seconds.

When DTC is logged (first trip), ECM sets ignition retard to maximum and limits engine speed to 3000 RPM.

1. Poor sensor contact with the cylinder block.
2. KS to ECM sensing circuit open or high resistance.
3. KS to ECM sensing circuit shorted to voltage.
4. KS failure.

Crank engine more than 2 seconds (engine will not start) or start engine and run at a steady speed more than 1000 RPM. Engine stall. Ignition on.

When Check Engine Indicator is activated (DTC flagged; first trip), ECM limits engine speed to 3000 RPM.

1. CKP sensor disconnected.
2. CKP sensor gap incorrect or foreign matter on sensor face.
3. CKP sensor sensing circuit open, shorted to ground or shorted to voltage.
4. CKP sensor failure.

Start engine and idle for more than 5 seconds. If CKP sensor signal is not present, engine will not start. The engine will stop if CKP sensor signal is lost while running.

None.

1. CKP sensor reluctor (on drive plate) foreign matter or damaged teeth.
2. CKP sensor sensing circuit intermittent open, shorted to ground or shorted to high voltage.
3. CKP sensor failure.

1. Engine cranking for more than 5 seconds (battery voltage 6-10.5 volts during cranking) or start engine and idle at more than 600 RPM.
2. If Bank 1 CMP sensor signal is not present, engine may start (50 percent chance). The engine will run normally if Bank 1 CMP sensor signal is lost while running.

None.

1. CMP sensor disconnected.
2. CMP sensor gap incorrect or foreign matter on sensor face.
3. CMP sensor sensing circuit open, shorted to ground or shorted to voltage.
4. CMP sensor failure.

1. Start engine. Idle for more than 5 seconds.
2. If Bank 1 CMP sensor signal is not present, engine may start (50 percent chance). The engine will run normally if Bank 1 CMP sensor signal is lost while running.

None.

1. CMP sensor disconnected.
2. CMP sensor gap incorrect or foreign matter on sensor face.
3. CMP sensor sensing circuit open circuit, short circuit to ground or short circuit to high voltage.
4. CMP sensor failure.

Engine running at a steady speed of less than 2500 RPM for more than 5 seconds.

When fault is detected, ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits individual cylinder fuel injection.
3. Inhibits Bank 1 closed loop fuel metering.
4. Inhibits Bank 1 downstream HO2S control.

1. ECM to ignition module primary circuit open, shorted to ground or high resistance.
2. Ignition module ground circuit open or high resistance.
3. Ignition module or coil failure.

1. Engine at normal operating temperature.
2. Normal varied driving for 3 minutes. Vehicle speed 37-75 MPH. Engine speed 1300-2500 RPM. Decelerate at fuel cut-off (foot off accelerator pedal).
3. Elevation less than 8000 feet.

None.

1. EGR pipe blocked.
2. EGR valve stuck open, closed or blocked.
3. EGR valve failure.

Ignition on for more than 5 seconds.

None.

1. EGR valve power supply circuit open.
2. EGR valve to ECM drive circuit pair (EGR valve pins No. 1 and 4, 6 and 3), open or high resistance.
3. EGR valve failure (stepper motor open circuit).

Ignition on for more than 5 seconds.

None.

1. EGR valve to ECM drive circuit pair (EGR valve pins No. 1 and 4, 6 and 3), shorted to ground or high voltage.
2. EGR valve failure (stepper motor short circuit).

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Varied driving for 3 minutes, then constant steady throttle 30-38 MPH. Engine speed 1100-1475 RPM for more than 25 seconds.
3. Elevation less than 8000 feet.

None.

1. HO2S disconnected.
2. HO2S to ECM wiring fault.
3. HO2S heater to ECM wiring fault.
4. HO2S heater failure.
5. Upstream HO2S failure.
6. Downstream HO2S failure.
7. Catalyst failure.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Varied driving for 3 minutes, then constant steady throttle 30-38 MPH. Engine speed 1100-1475 RPM for more than 25 seconds.
3. Elevation less than 8000 feet.

None.

1. HO2S disconnected.
2. HO2S to ECM wiring fault.
3. HO2S heater to ECM wiring fault.
4. HO2S heater failure.
5. Upstream HO2S failure.
6. Downstream HO2S failure.
7. Catalyst failure.

1. Fuel tank level between 15-85 percent capacity. After start-up, run engine 13 minutes.
2. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
3. Vehicle driven 12-60 MPH for more than 6 minutes. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits adaptive fuel metering and inhibits canister purge.

1. Fuel cap seal defective.
2. EVAP system leak (canister damage, line damage).
3. EVAP valve to ECM drive circuit open, shorted or high resistance.
4. EVAP valve power supply circuit open.
5. EVAP valve to engine purge pipe damaged, blocked or leaking.
6. EVAP valve operating vacuum hose leak or blockage.
7. EVAP valve failure.
8. Fuel tank leak.

Monitoring occurs during EVAP leak check.

1. Fuel tank level between 15-85 percent capacity. After start-up, run engine 13 minutes.
2. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
3. Vehicle driven 12-60 MPH for more than 6 minutes. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits EGR diagnostic monitoring.

1. EVAP valve to ECM drive circuit open, shorted or high resistance.
2. EVAP valve power supply circuit open.
3. EVAP valve operating vacuum hose leak or blockage.
4. EVAP valve failure.

Engine at normal operating temperature. Vehicle stationary, brakes applied, gear selector in "D" and engine idling for more than 10 seconds.

None.

1. EVAP to ECM drive circuit open, shorted or high resistance.
2. EVAP failure.

Engine at normal operating temperature. Vehicle stationary, brakes applied, gear selector in "D", engine idling for more than 10 seconds.

None.

1. EVAP to ECM drive circuit open, shorted or high resistance.
2. EVAP failure.

Monitoring occurs during EVAP leak check.

1. Fuel tank level between 15-85 percent capacity. After start-up, run engine 13 minutes.
2. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
3. Vehicle driven 12-60 MPH for more than 6 minutes. Elevation less than 8000 feet.

None.

1. Canister Close Valve (CCV) power supply circuit fault.
2. CCV to ECM drive circuit open, high resistance or short to voltage.
3. CCV failure.

Ignition on for more than 5 seconds. ECM CCV drive inactive (valve open).

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits EVAP leak check monitoring, inhibits adaptive fuel metering and inhibits canister purge.

1. CCV power supply circuit fault.
2. CCV to ECM drive circuit open, high resistance or shorted to voltage.
3. CCV failure.

Monitoring occurs during EVAP leak check.

1. Fuel tank level between 15-85 percent capacity. After start-up, run engine 13 minutes.
2. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
3. Vehicle driven 12-60 MPH for more than 6 minutes. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Inhibits EVAP leak check monitoring.
2. Inhibits adaptive fuel metering.
3. Inhibits canister purge.

1. CCV to ECM drive circuit short circuit to ground.
2. CCV failure.

Monitoring occurs during EVAP leak check.

1. Fuel tank level between 15-85 percent capacity. After start-up, run engine 13 minutes.
2. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
3. Vehicle driven 12-60 MPH for more than 6 minutes. Elevation less than 8000 feet.

None.

1. FTP sensor disconnected.
2. FTP sensor to ECM sensing circuit open, shorted to ground or shorted to voltage.
3. FTP sensor to ECM power supply circuit open or shorted to ground.
4. FTP sensor to ECM wiring (supply sensing, signal ground) shorted to each other.
5. FTP sensor failure.

Ignition on for more than 5 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits EVAP leak check monitoring.

1. FTP sensor disconnected.
2. FTP sensor to ECM sensing circuit open or shorted to ground.
3. FTP sensor to ECM power supply circuit open or shorted to ground.
4. FTP sensor failure.

Ignition on for more than 5 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits EVAP leak check monitoring.

1. FTP sensor to ECM signal ground circuit open.
2. FTP sensor to ECM wiring (supply sensing, signal ground) shorted to each other.
3. FTP sensor to ECM sensing circuit shorted to voltage.
4. FTP sensor failure.

1. Fuel tank level between 15-85 percent capacity. After start-up, run engine 13 minutes.
2. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
3. Vehicle driven 12-60 MPH for more than 6 minutes. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits adaptive fuel metering and inhibits canister purge.

1. Fuel cap missing.
2. Fuel cap seal defective.
3. EVAP system leak (canister damage, line damage).
4. EVAP valve to ECM drive circuit open, shorted or high resistance.
5. EVAP valve power supply circuit open.
6. EVAP valve to engine purge pipe damaged, blocked or leaking.
7. EVAP valve operating vacuum hose leak or blockage.
8. EVAP valve failure.
9. Fuel tank leak.

1. Fuel tank level between 15-85 percent capacity. After start-up, run engine 13 minutes.
2. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
3. Vehicle driven 12-60 MPH for more than 6 minutes. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits adaptive fuel metering and inhibits canister purge.

1. Fuel cap seal defective.
2. EVAP system leak (canister damage, line damage).
3. EVAP valve to ECM drive circuit open, shorted or high resistance.
4. EVAP valve power supply circuit open.
5. EVAP valve to engine purge pipe damaged, blocked or leaking.
6. EVAP valve operating vacuum hose leak or blockage.
7. EVAP valve failure.
8. Fuel tank leak.

Vehicle driven more than 30 miles.

None.

1. Fuel level sensor to instrument pack circuits intermittently shorted, open or high resistance.
2. Fuel level sensor failure.
3. Instrument pack fault (incorrect fuel level data).

Engine at normal operating temperature. Fans cycle on/off.

None.

1. Radiator fan control relay module to ECM (series) drive circuit (relay pin No. 9) fault.
2. Relay coil ignition power supply circuit open.
3. ECM ground circuit fault (relay coil drive).
4. ECT sensor circuit malfunction. See «DTC P0116: ENGINE COOLANT TEMPERATURE SENSOR RANGE/PERFORMANCE»(ref-11917-S11157825142001041600000) .

Engine at normal operating temperature. Fans cycle on/off.

None.

1. Radiator fan control relay module to ECM (parallel) drive circuit (relay pin No. 7) fault.
2. Relay coil ignition power supply circuit open.
3. ECM ground circuit fault (relay coil drive).
4. ECT sensor circuit malfunction. See «DTC P0116: ENGINE COOLANT TEMPERATURE SENSOR RANGE/PERFORMANCE»(ref-11917-S11157825142001041600000) .

1. Engine and transmission at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Gear selector in "N" position. Engine idling for more than 30 seconds with no electrical load, A/C compressor, radiator fans or brake pedal applied.
3. Elevation less than 8000 feet.

None.

1. Air intake blockage.
2. Accessory drive overload (defective or seized component).
3. Throttle valve stuck closed.
4. Throttle assembly failure.

1. Engine and transmission at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Gear selector in "N" position. Engine idling for more than 30 seconds with no load, A/C compressor, radiator fans or brake pedal applied.
3. Elevation less than 8000 feet.

None.

1. Intake air leak between MAF sensor and throttle.
2. Intake air leak between throttle and engine.
3. Engine breather leak.
4. Throttle valve stuck open.
5. Throttle assembly failure.

Ignition on for more than 35 seconds.

None.

1. ECM battery power supply open circuit (high resistance).
2. ECM ignition power supply open circuit (high resistance).

Ignition on for more than 75 seconds.

When fault is detected, ECM inhibits cruise control.

1. Cruise control switches internal steering wheel shorted to ground.
2. Steering wheel clockspring shorted to ground.
3. Clockspring to ECM circuit shorted to ground.
4. CANCEL switch failure (stuck on).

Ignition on for more than 75 seconds.

When fault is detected, ECM inhibits cruise control.

1. Cruise control switches internal steering wheel shorted to ground.
2. Steering wheel clockspring shorted to ground.
3. Clockspring to ECM circuit shorted to ground.
4. RESUME switch failure (stuck on).

Ignition on for more than 5 seconds.

When fault is detected, ECM inhibits cruise control.

1. Cruise control switches internal steering wheel open circuit.
2. Steering wheel clockspring open or high resistance.
3. Clockspring to ECM circuit (ACCEL/DECEL) open or high resistance.
4. ACCEL/DECEL switch failure.

Ignition on for more than 10 minutes.

When fault is detected, ECM inhibits cruise control.

1. Cruise control switches internal steering wheel shorted to ground.
2. Steering wheel clockspring shorted to ground.
3. Clockspring to ECM circuit shorted to ground.
4. DECEL switch failure (stuck on).

Ignition on for more than 10 minutes.

When fault is detected, ECM inhibits cruise control.

1. Cruise control switches internal steering wheel shorted to ground.
2. Steering wheel clockspring shorted to ground.
3. Clockspring to ECM circuit shorted to ground.
4. ACCEL/SET switch failure (stuck on).

Ignition on for more than 5 seconds.

When Check Engine Indicator is activated (DTC flagged; first trip), ECM: inhibits all diagnostic monitoring except

1. Throttle control.
2. Upstream HO2S control.
3. CPU 1 and 2.

ECM failure.

"System Readiness Test".

None.

The Systems Readiness Test is accessed from the PDU menu structure. PDU will report if any portion of the Systems Readiness Test has not been completed. The following less frequently performed test are identified as incomplete

1. Module $11 (identifies EMS ECM).
2. Catalyst.
3. O2 sensor.
4. O2 sensor heaters.

Further confirmation of the System Readiness Test status is available by retrieving the stored DTCs. If DTC P1000 is set in memory, the on-board diagnostic tests have not been completed. If DTC P1111 is set in memory, all on-board diagnostic tests have been completed. See DTC P1000: SYSTEM CHECKS NOT COMPLETE SINCE LAST MEMORY CLEAR & DTC P1111: SYSTEM CHECKS COMPLETE SINCE LAST MEMORY CLEAR under PROGRAMMING.

Ignition on for more than 5 seconds.

When Amber MIL is activated (DTC logged; first trip), ECM

1. Limits engine speed to 3000 RPM.
2. Substitutes throttle angle for engine load measurement.
3. Inhibits canister purge.

1. MAF sensor to ECM reference ground circuit open, shorted to high voltage or high resistance.
2. MAF sensor to ECM sensing circuit open circuit.
3. MAF sensor failure.

Ignition on for more than 5 seconds.

When DTC logged (first trip), ECM substitutes fixed value of 29.92 in. Hg (1013 mbar).

1. MAP sensor to ECM sensing circuit open or shorted to ground.
2. MAP sensor to ECM reference voltage circuit open or shorted to ground.
3. MAP sensor failure.

Ignition on for more than 5 seconds.

When DTC logged (first trip), ECM substitutes fixed value of 29.92 in. Hg (1013 mbar).

1. MAP sensor to ECM reference ground circuit open.
2. MAP sensor to ECM wiring shorted to each other.
3. MAP sensor to ECM sensing circuit shorted to voltage.
4. MAP sensor failure.

"System Readiness Test".

None.

The Systems Readiness Test is accessed from the PDU menu structure. PDU will report if any portion of the Systems Readiness Test has not been completed. The following less frequently performed test are identified as incomplete

1. Module $11 (identifies EMS ECM).
2. Catalyst.
3. O2 sensor.
4. O2 sensor heaters.

Further confirmation of the System Readiness Test status is available by retrieving the stored DTCs. If DTC P1000 is set in memory, the on-board diagnostic tests have not been completed. If DTC P1111 is set in memory, all on-board diagnostic tests have been completed.

Ignition on for more than 5 seconds.

When Amber MIL is activated (DTC logged; first trip), ECM

1. Limits throttle opening to 30 percent.
2. Substitutes fixed charge air temperature of 244°F (118°C).

1. IAT sensor 2 to ECM sensing circuit open, high resistance or shorted to voltage.
2. IAT sensor 2 failure.

Ignition on for more than 5 seconds.

When Amber MIL is activated (DTC logged; first trip), ECM

1. Limits throttle opening to 30 percent
2. Substitutes fixed charge air temperature of 244°F (118°C).

1. Supercharger intercooler failure.
2. IAT sensor 2 to ECM sensing circuit shorted to ground.
3. IAT sensor 2 failure.

1. Ignition on. Battery voltage more than 9 volts.
2. Slowly move accelerator pedal through full range.
3. Conditions present for more than 40 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. PPS cable adjustment incorrect.
2. PPS to ECM sensing circuits 1 and 2 open, shorted or high resistance.
3. PPS power supply fault.
4. PPS reference ground fault.
5. PPS failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. PPS to ECM sensing circuit 1 (sensor pin No. 4) wire open or high resistance.
2. PPS power supply fault.
3. PPS failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. PPS to ECM sensing circuit 1 (sensor pin No. 4) wire shorted to voltage.
2. PPS failure.

Ignition on. Fan operating.

None.

1. Cooling fan power supply (fuse) fault.
2. Cooling fan drive circuit fault.
3. Cooling fan motor failure.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Drive and accelerate to 60 MPH. Release accelerator and coast to 37 MPH and ensure engine speed is 1000-3000 RPM during coast.

None.

1. AAI piping blocked.
2. Throttle body air channel blocked.
3. AACV stuck.

Engine Coolant Temperature (ECT) sensor at ambient temperature. Start engine and bring to normal operating temperature.

When Check Engine Indicator is activated (DTC logged; second trip), ECM inhibits AACV range/performance diagnostic monitoring.

1. AACV power supply circuit fault.
2. AACV ground circuit fault.
3. AACV to ECM Pulse Width Modulated (PWM) drive circuit open, shorted or high resistance.
4. AACV failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. PPS to ECM sensing circuit 2 (sensor pin 2) open or high resistance.
2. PPS power supply fault.
3. PPS failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. PPS to ECM sensing circuit 2 (sensor pin No. 2) wire shorted to voltage.
2. PPS failure.

Ignition on for more than 3 minutes.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. Throttle adaptations not performed after battery disconnect.
2. TPS disconnected.
3. TPS to ECM sensing circuits open or high resistance.
4. Throttle motor power relay failure.
5. Throttle motor power relay to ECM circuit fault.
6. Throttle motor power relay power supply open circuit.
7. ECM ground circuit fault (relay coil drive).
8. Throttle motor to ECM drive circuits open, shorted or high resistance.
9. Throttle motor failure.
10. Throttle assembly failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode (engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders).
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. Throttle motor disconnected.
2. Throttle motor to ECM drive circuits shorted or open.
3. Throttle motor failure.

Ignition off. Ignition on for more than 5 seconds.

On normally aspirated engines, there is no default action. On supercharged engines, when fault is detected, ECM operates fuel pump No. 2.

1. Fuel pump relay failure.
2. Fuel pump relay to ECM circuit fault.
3. Fuel pump relay coil power supply circuit open.
4. ECM ground circuit fault (relay coil drive).

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode, engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders.
3. Inhibits idle speed control.
4. Inhibits cruise control
5. Inhibits traction control/stability control.

1. ECM to sensors reference voltage circuit shorted to ground, shorted to voltage, open or high resistance.
2. Throttle Position Sensor (TPS), Pedal Position Sensor (PPS) or Fuel Tank Pressure (FTP) sensor failure(s).

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode, engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders.
3. Inhibits idle speed control.
4. Inhibits cruise control
5. Inhibits traction control/stability control.

1. ECM to sensors reference voltage circuit shorted to ground.
2. Throttle Position Sensor (TPS), Pedal Position Sensor (PPS) or Fuel Tank Pressure (FTP) sensor failure(s).

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode, engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders.
3. Inhibits idle speed control.
4. Inhibits cruise control
5. Inhibits traction control/stability control.

1. ECM to sensors reference voltage circuit open, high resistance or shorted to voltage.
2. Throttle Position Sensor (TPS), Pedal Position Sensor (PPS) or Fuel Tank Pressure (FTP) sensor failure(s).

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode, engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinders.
3. Inhibits idle speed control.
4. Inhibits cruise control
5. Inhibits traction control/stability control.

1. ECM to sensors reference ground circuit open (high resistance).
2. TPS, PPS, ECT sensors, IAT sensor or FTP sensor failure(s).

Start engine and idle.

When Amber MIL is activated (DTC logged; first trip), ECM limits engine speed to 3000 RPM.

Starter relay coil to ECM/BPM circuit open.

Start engine. Drive vehicle and accelerate to more than 13 MPH with engine speed 1200-1300 RPM. Decelerate to stop. Repeat drive cycle 5 times.

When Amber MIL is activated (DTC logged; first trip), ECM limits engine speed to 3000 RPM.

1. Starter relay coil to ECM/BPM circuit shorted to voltage.
2. BPM failure.

Ignition on. Ignition off for more than 3 seconds. Ignition on.

When fault is detected, ECM

1. Limits throttle valve movement in response to normal accelerator pedal movement.
2. Limits vehicle speed to 80 MPH.
3. Inhibits cruise control.

Throttle return spring failure (throttle failure).

Ignition on for more than 10 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode, engine speed controlled to between 1000-1250 RPM by fuel cutoff to cylinder.
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. Throttle motor power relay failure.
2. Throttle motor power relay to ECM circuit fault.
3. Throttle motor power relay coil power supply circuit open.
4. ECM ground circuit fault (relay coil drive).

Ignition on. Ignition off for more than 3 seconds. Ignition on.

When fault is detected, ECM

1. Limits throttle valve movement in response to normal accelerator pedal movement.
2. Limits vehicle speed to 80 MPH.
3. Inhibits cruise control.

Throttle limp home spring failure (throttle failure).

Ignition on for more than 10 seconds.

None.

1. Key Transponder Module (KTM) to ECM circuit shorted, high resistance or open.
2. Loss of ignition switched power supply to the ECM harness connector EM82 terminal No. 9 for more than 16 milliseconds.
3. KTM failure.
4. Security system incorrectly configured (KTM/ECM).

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at steady speed between idle and 2500 RPM.
3. Conditions present for more than 2 minutes 30 seconds.
4. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits Bank 1 closed loop fuel metering.
3. Inhibits Bank 1 adaptive fuel metering
4. Inhibits canister purge.

1. Cylinder compression low.
2. Worn camshaft/broken valve spring(s).
3. Fuel delivery pressure low or high.
4. Fuel injector(s) blocked or leaking.
5. Fuel injector(s) continuously open.
6. Fuel contamination.
7. Fuel injector circuit fault(s). Injector DTCs are also flagged.
8. Spark plug failure, fouled or incorrect gap.
9. ECM to ignition module primary circuit fault(s). Cylinder misfire DTC is also set.
10. Ignition module ground circuit open (high resistance).
11. Ignition module or coil failure.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at steady speed between idle and 2500 RPM.
3. Conditions present for more than 2 minutes 30 seconds.
4. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits Bank 1 closed loop fuel metering.
3. Inhibits Bank 1 adaptive fuel metering.
4. Inhibits canister purge.

1. Cylinder compression low.
2. Worn camshaft/broken valve spring(s).
3. Fuel delivery pressure low or high.
4. Fuel injector(s) blocked or leaking.
5. Fuel injector(s) continuously open.
6. Fuel contamination.
7. Fuel injector circuit fault(s). Injector DTCs are also flagged.
8. Spark plug failure, fouled or incorrect gap.
9. ECM to ignition module primary circuit fault(s). Cylinder misfire DTC is also set.
10. Ignition module ground circuit open (high resistance).
11. Ignition module or coil failure.

1. Engine at normal operating temperature. Intake air temperature is more than 18°F (-8°C).
2. Vehicle driven at steady speed between idle and 2500 RPM.
3. Conditions present for more than 2 minutes 30 seconds.
4. Elevation less than 8000 feet.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM

1. Limits engine speed to 3000 RPM.
2. Inhibits Bank 1 closed loop fuel metering.
3. Inhibits Bank 1 adaptive fuel metering.
4. Inhibits canister purge.

1. Cylinder compression low.
2. Worn camshaft/broken valve spring(s).
3. Fuel delivery pressure low or high.
4. Fuel injector(s) blocked or leaking.
5. Fuel injector(s) continuously open.
6. Fuel contamination.
7. Fuel injector circuit fault(s). Injector DTCs are also flagged.
8. Spark plug failure, fouled or incorrect gap.
9. ECM to ignition module primary circuit fault(s). Cylinder misfire DTC is also set.
10. Ignition module ground circuit open (high resistance).
11. Ignition module or coil failure.

1. Engine cranking for more than 5 seconds (battery voltage 6-10.5 volts during cranking) or start engine and idle at more than 600 RPM.
2. If Bank 1 CMP sensor signal is not present, engine may start (50 percent chance). The engine will run normally if Bank 1 CMP sensor signal is lost while running.

None.

1. CMP sensor disconnected.
2. CMP sensor gap incorrect or foreign matter on sensor face.
3. CMP sensor sensing circuit open, shorted to ground or shorted to high voltage.
4. CMP sensor failure.

Start engine. Idle for more than 5 seconds. If Bank 1 CMP sensor signal is not present, engine may start (50 percent chance). The engine will run normally if Bank 1 CMP sensor signal is lost while running.

None.

1. CMP sensor disconnected.
2. CMP sensor gap incorrect or foreign matter on sensor face.
3. CMP sensor sensing circuit open, shorted to ground or shorted to voltage.
4. CMP sensor failure.

Engine running at a steady speed of less than 2500 RPM for more than 5 seconds.

When fault is set, ECM limits engine speed to 3000 RPM.

1. Ignition monitoring circuit between splice and ECM open, shorted to ground or shorted circuit to voltage.
2. Ignition module/coil group ground circuit fault.
3. Ignition coil relay failure.

Engine running at a steady speed of less than 2500 RPM for more than 5 seconds.

When fault is set, ECM limits engine speed to 3000 RPM.

1. Ignition monitoring circuit between splice and ECM open, shorted to ground or shorted to voltage.
2. Ignition module/coil group ground circuit fault.
3. Ignition coil relay failure.

Drive vehicle. Accelerate quickly to cruise, decelerate to stop. Repeat several times.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM sets VVT drive Pulse Width Modulated (PWM) duty cycle to zero (intake camshaft fully retarded).

1. VVT solenoid valve to ECM PWM drive circuit fault.
2. VVT solenoid valve to ECM ground circuit fault.
3. VVT solenoid failure.
4. VVT oil flow fault (DTC P1384).
5. VVT camshaft mechanical failure (DTC P1384).

Drive vehicle. Accelerate quickly to cruise, decelerate to stop. Repeat several times.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM sets VVT drive Pulse Width Modulated (PWM) duty cycle to zero (intake camshaft fully retarded).

1. VVT solenoid valve to ECM PWM drive circuit fault.
2. VVT solenoid valve to ECM ground circuit fault.
3. VVT solenoid failure.
4. VVT oil flow fault (DTC P1396).
5. VVT camshaft mechanical failure (DTC P1396).

Ignition off. Ignition on for more than 5 seconds.

When Amber MIL is activated (DTC logged; first trip), ECM limits throttle opening to 30 percent.

1. Intercooler coolant pump relay battery power supply circuit open.
2. Intercooler pump relay failure.
3. Intercooler pump ECM to relay drive circuit fault.
4. Intercooler pump relay coil ground circuit fault.
5. ECM power supply fault (relay drive).

Engine at normal operating temperature. Drive vehicle at 50-63 MPH with engine speed 1800-2200 RPM. Conditions present for more than 35 seconds.

None.

1. Gear selector cable setting incorrect.
2. Transmission Rotary (TR) switch to ECM circuit open or high resistance.
3. TR switch failure.
4. D-4 switch to TCM circuit open or high resistance.
5. D-4 switch fault.

During engine start.

When fault is set, ECM inhibits fuel injection.

1. Gear selector cable setting incorrect.
2. Transmission Rotary (TR) switch to ECM circuit open or high resistance.
3. TR switch failure.

Drive vehicle. Engage cruise control for more than 10 seconds. Disengage cruise control. Repeat drive cycle 5 times.

When fault is set, ECM inhibits cruise control.

1. Brake switch to ECM circuit open, shorted to ground or high resistance.
2. Brake switch ignition switched ground circuit open.
3. Brake switch failure.
4. Brake cancel switch to ECM circuit open, shorted to ground or high resistance.
5. Brake cancel switch to cruise control switch to ECM circuit open, shorted to ground or high resistance.
6. Brake cancel switch ignition switched power supply circuit open.
7. Brake cancel switch failure.
8. Cruise control switch failure.

Ignition on.

None.

1. DTC indicates that the inertia switch has tripped (vehicle impact).
2. If no vehicle impact, inertia switch to ECM circuit, short circuit to ground or inertial switch failure.

Ignition on. Ignition off. Ignition on for more than 5 seconds.

None.

1. ECM control relay failure.
2. ECM control relay to ECM circuit fault.
3. ECM control relay coil power supply circuit open.
4. ECM ground circuit fault (relay coil drive).

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode, engine speed controlled to between 1000-1250 RPM by fuel cut-off to cylinders.
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. ECM FCCP (programming) circuit (ECM harness connectors EM80 terminal No. 19 or 27) shorted to ground.
2. ECM failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode, engine speed controlled to between 1000-1250 RPM by fuel cut-off to cylinders.
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

ECM failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode, engine speed controlled to between 1000-1250 RPM by fuel cut-off to cylinders.
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

1. Throttle motor relay coil to ECM circuit open, shorted to ground or shorted to voltage.
2. ECM failure.

Ignition on for more than 5 seconds.

When Red MIL is activated (DTC logged; first trip), ECM

1. Switches off throttle motor (via relay).
2. Initiates throttle "limp home" mode, engine speed controlled to between 1000-1250 RPM by fuel cut-off to cylinders.
3. Inhibits idle speed control.
4. Inhibits cruise control.
5. Inhibits traction control/stability control.

ECM failure.

Ignition on. Ignition off for more than 3 seconds. Ignition on. Ignition off again for more than 3 seconds. Ignition on.

When fault is set, ECM

1. Limits throttle valve movement in response to normal accelerator pedal movement.
2. Limits vehicle speed to 80 MPH.
3. Inhibits cruise control.

ECM failure.

Ignition on for more than 5 seconds.

When fault is set, ECM inhibits cruise control and idle speed control quality deteriorates.

1. CAN open circuit fault (ABS/TCCM to ECM).
2. CAN short circuit fault.
3. ABS/TCCM failure.
4. ECM failure.

Ignition on for more than 5 seconds.

None. Engine speed and coolant temperature data will be missing at instrument pack.

1. CAN open circuit fault (INST to ECM).
2. CAN short circuit fault.
3. INST failure.
4. ECM failure.

Ignition on for more than 5 seconds.

When fault is set, ECM limits throttle to approximately 30 percent and inhibits cruise control (all CAN data unavailable).

1. CAN short circuit fault.
2. Control module failure (check for additional flagged DTC(s) to locate control module source.

Ignition on for more than 5 seconds.

When fault is set, ECM limits throttle to approximately 30 percent and inhibits cruise control (torque reduction request data missing results in harsh transmission shifts).

1. CAN open circuit fault (TCM to ECM).
2. CAN short circuit fault.
3. TCM failure.
4. ECM failure.

Start engine and run for more than 5 seconds.

When fault is detected, ECM limits engine speed to 3000 RPM.

1. Fuel pump 2 relay failure.
2. Fuel pump 2 relay to ECM circuit fault.
3. Fuel pump 2 relay coil power supply circuit open.
4. ECM ground circuit fault (relay coil drive).

Start engine and run for more than 5 seconds.

When DTC is set (first trip), ECM sets ignition retard to maximum and limits engine speed to 3000 RPM.

ECM failure.

Ignition on.

None.

ECM to Data Link Connector (DLC) circuit shorted to ground or shorted to voltage.

Ignition on for more than 5 seconds.

None.

ECM failure.

Ignition on. Ignition off for more than 3 seconds. Ignition on. Ignition off again for more than 3 seconds. Ignition on.

When fault is set, ECM

1. Limits throttle valve movement in response to normal accelerator pedal movement.
2. Limits vehicle speed to 80 MPH.
3. Inhibits cruise control.

ECM failure.

Ignition on. Ignition off for more than 3 seconds. Ignition on. Ignition off again for more than 3 seconds. Ignition on.

When fault is set, ECM

1. Limits throttle valve movement in response to normal accelerator pedal movement.
2. Limits vehicle speed to 80 MPH.
3. Inhibits cruise control.

1. Throttle motor power relay failure (contacts stuck on).
2. Throttle motor power relay to ECM coil circuit shorted to ground.
3. Throttle motor power relay to ECM supply circuit shorted to voltage.

Ignition on for more than 5 seconds.

When fault is set, ECM inhibits cruise control.

1. CAN open circuit fault; Adaptive Speed Control (ASC) control module or Adaptive Speed Control Booster (ASCB) control module to ECM.
2. CAN short circuit fault.
3. ASC control module or ASCB control module failure.

Ignition on for more than one minute.

When fault is detected, ECM inhibits cruise control.

Adaptive speed control switch(es) failure.

Ignition on for more than 8 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits (Bank 1, Upstream 1) HO2S operation.

1. HO2S heater failure.
2. HO2S sensing circuit shorted to ground or voltage.
3. HO2S sensing circuit open.
4. ECM failure.

Ignition on for more than 8 seconds.

When Check Engine Indicator is activated (DTC flagged; second trip), ECM inhibits (Bank 1, Upstream 1) HO2S operation.

1. HO2S heater failure.
2. HO2S sensing circuit shorted to ground or voltage.
3. HO2S sensing circuit open.
4. ECM failure.

XJ8

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

XJR

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

XK8

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

XKR

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.