Engine Controls - Self Diagnostics - 6.6L: Diagnosis Chevrolet Silverado 1500 HD

ON-BOARD DIAGNOSTICS

ECM is equipped with a self-diagnostic system which detects system failures or abnormalities. When a malfunction occurs, ECM will store a Diagnostic Trouble Code (DTC) and, in most cases, illuminate the Malfunction Indicator Light (MIL) located on instrument cluster.

There are 2 paths for accessing on-board diagnostics. It is necessary to access information through both paths, as each path presents some different information.

1. Generic OBD-II This provides all generic codes and some OEM codes, serial data PIDs required for generic OBD-II and some OEM PIDs, monitor status, pending codes and freeze frame.
2. OEM All DTCs, all PIDs, failure records, enhanced scan tool information and all other OEM scanner functions.

Scan Tool Snapshot

The scan tool can be set up to take a snapshot of the parameters available via serial data. The snapshot function records live data over a period of time. The recorded data can be played back and analyzed. The scan tool can also graph parameters singly or in combinations of parameters for comparison. The snapshot can be triggered manually at the time the symptom is noticed, or set up in advance to trigger when a DTC sets. An abnormal value captured in the recorded data may point to a system or component that needs to be investigated further. Refer to the scan tool user instructions for more information on the Snapshot function.

DIAGNOSTIC STARTING POINT - ENGINE CONTROLS

Diagnosis of computerized engine control system should be performed in the following order

1. Ensure all engine systems not related to computer system are operating properly. DO NOT proceed with testing unless all other problems have been repaired. Diagnostic system check must be performed before using specific DTC testing procedure. See «DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS»(ref-158516-S41425574832003100300000) .
2. If no DTCs are present and a driveability problem exists, see «SYMPTOMS»(ref-152999-S03767149722003031000000) in TROUBLE SHOOTING - NO CODES - 6.6L SIERRA & SILVERADO - DIESEL article. Doing so will help identify proper system or component to check in «SYSTEM & COMPONENT TESTING - 6.6L SIERRA & SILVERADO - DIESEL»(ref-153295) article.
3. After necessary repairs are made, clear DTCs, verify vehicle will enter "closed loop" operation and ensure DTC does not reset.

Diagnostic Procedure

Note. Do not perform this diagnostic if there is not a driveability concern, unless another procedure directs you to this diagnostic. Before you proceed with diagnosis, search for applicable service bulletins. Unless a diagnostic procedure instructs you, do NOT clear the DTCs. If there is a condition with the starting system, see appropriate STARTERS article in ELECTRICAL. Ensure the battery has a full charge. Ensure the battery cables are clean and tight. Ensure the ECM grounds are clean, tight, and in the correct location.

1. Install a scan tool. Does the scan tool turn ON? If yes, go to next step. If no, see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
2. Turn ON the ignition, with the engine OFF. Attempt to establish communication with the listed control modules. If you are using a Tech 2®, obtain the information using the Class 2 Message Monitor feature: ECM. Body Control Module (BCM). Instrument Panel (IP) cluster. Electronic Brake Control Module (EBCM). Driver Information Center (DIC). Heating, Ventilation, and Air Conditioning (HVAC). Does the scan tool communicate with all the listed control modules? If yes, go to next step. If no, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
3. Access CLASS 2 POWER MODE in DIAGNOSTIC CIRCUIT CHECK on scan tool. Rotate ignition switch through all positions while observing IGNITION SWITCH POWER MODE parameter. Actual ignition switch position should match IGNITION SWITCH POWER MODE parameter on scan tool. (Scheme 814) Do all ignition switch positions match all IGNITION SWITCH POWER MODE parameters on scan tool? If yes, go to next step. If no, see «POWER MODE MISMATCH»(ref-158516-S22589840642003100300000).
4. Attempt to start the engine. Does the engine start and idle? If yes, go to next step. If no, see ENGINE CRANKS BUT DOES NOT RUN in «TROUBLE SHOOTING - NO CODES - 6.6L SIERRA & SILVERADO - DIESEL»(ref-152999) article.
5. Select the DTC display function for the following control modules: ECM, BCM, IP Cluster, EBCM, DIC and HVAC. Does the scan tool display any DTCs? If yes, go to next step. If no, go to step 10.
6. Using a scan tool, select CAPTURED INFO in order to store the powertrain DTC information. When complete, go to next step.
7. Does the scan tool display DTCs which begin with a "U"? If yes, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT for diagnosis. If no, go to next step.
8. Does the scan tool display DTC P0601, P0602, P0604 or P0606? If yes, see «DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681 & P1683: ECM MEMORY»(ref-158516-S11806393082003100300000) under DIAGNOSTIC TESTS. If no, go to next step.
9. Does the scan tool display DTC P0562, P0563, P1637 or P1638? If yes, see appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If no, see «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-158516-S25875883752003100300000).
10. Is the customer's concern with the automatic transmission? If yes, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If no, go to next step.
11. Is the customer's concern with Inspection and Maintenance (I/M) testing? If yes, see «INSPECTION/MAINTENANCE SYSTEM CHECK»(ref-158516-S13422433262003100300000) under DRIVE CYCLES.
12. Review the following symptoms. Hard start, surges/chugs, lack of power, sluggishness, sponginess, detonation/spark knock, hesitation, sag, stumble, cuts out, misses, poor fuel economy, poor fuel fill quality, rough, unstable, or incorrect idle and stalling, dieseling, run-on and backfire. See «TROUBLE SHOOTING - NO CODES - 6.6L SIERRA & SILVERADO - DIESEL»(ref-152999) article. Did you find and correct the condition? If yes, system is okay. If no, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000).

1. The Diagnostic System Check will provide the following information: The identification of the control module(s) which command the system. The ability of the control module(s) to communicate through the serial data circuit. The identification of any stored Diagnostic Trouble Codes (DTCs) and their status. The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
2. Install a scan tool. Does the scan tool turn ON? If yes, go to next step. If no, see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
3. Turn ON the ignition, with the engine OFF. Attempt to establish communication with the ECM. If you are using a Tech 2®, obtain the information using the Class 2 Message Monitor feature. Does the scan tool communicate with the ECM? If yes, go to next step. If no, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
4. Select the Engine Control Module display DTCs function on the scan tool. Does the scan tool display any DTCs? If yes, go to next step. If no, see «COOLING SYSTEM TROUBLE SHOOTING»(ref-27342-S11025938142001112800000) under ENGINE MECHANICAL in TROUBLE SHOOTING - BASIC PROCEDURES article in GENERAL INFORMATION.
5. Does the scan tool display DTCs which begin with a "U"? If yes, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT for diagnosis. If no, go to next step.
6. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-158516-S25875883752003100300000) .

Note. This procedure is used if the observed vehicle power mode does not match the actual ignition switch position. Open the driver's door and leave it open during this test. This will disable the RAP power mode and eliminate this power mode from the power mode parameter list.

1. Connect a scan tool to Data Link Connector (DLC). Turn OFF the ignition. Using a scan tool, under the DIAGNOSTIC CIRCUIT CHECK menu, observe the CLASS 2 POWER MODE parameter. Does the displayed power mode parameter match the actual ignition switch position? If yes, go to next step. If no, go to step 6 .
2. Turn the ignition switch to the UNLOCK position. Using a scan tool, under the DIAGNOSTIC CIRCUIT CHECK menu, observe the CLASS 2 POWER MODE parameter. Does the displayed power mode parameter match the actual ignition switch position? If yes, go to next step. If no, go to step 6 .
3. Turn ON the ignition, with the engine OFF. Using a scan tool, under the DIAGNOSTIC CIRCUIT CHECK menu, observe the CLASS 2 POWER MODE parameter. Does the displayed power mode parameter match the actual ignition switch position? If yes, go to next step. If no, go to step 6 .
4. Turn the ignition switch to the CRANK position. Using a scan tool, under the DIAGNOSTIC CIRCUIT CHECK menu, observe the CLASS 2 POWER MODE parameter. Does the displayed power mode parameter match the actual ignition switch position? If yes, go to next step. If no, go to step 6 .
5. Turn the ignition switch to the ACCY position. Using a scan tool, under the DIAGNOSTIC CIRCUIT CHECK menu, observe the CLASS 2 POWER MODE parameter. Does the displayed power mode parameter match the actual ignition switch position? If yes, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) . If no, go to next step.
6. Turn OFF the ignition. Disconnect the BCM. Hold the ignition switch in the position that indicated the incorrect power mode. Using a test light connected to a good ground, test the BCM ignition switch inputs for voltage. See WIRING DIAGRAMS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. Is voltage present on only the inputs specified for the ignition switch position? If yes, go to next step. If no, go to step 8 .
7. Hold the ignition switch in the position that indicated the incorrect power mode. Using a test light connected to a good ground, test the BCM ignition switch inputs for voltage. See WIRING DIAGRAMS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If voltage does not exist on any inputs specified for the ignition switch position, go to step 9 . If voltage exists on any inputs specified for the ignition switch position, go to step 11 .
8. Disconnect the ignition switch. See appropriate STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT. Test the BCM ignition switch input circuits for a short to voltage. Test the BCM ignition switch circuits for a short between circuits. See BODY CONTROL MODULES in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Did you find and correct the condition? If yes, go to step 14 . If no, go to step 10 .
9. Disconnect the ignition switch. See appropriate STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT. Test the BCM ignition switch input circuits for an open. See BODY CONTROL MODULES in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Did you find and correct the condition? If yes, go to step 14 . If no, go to next step.
10. Inspect for poor connections and terminal tension at the harness connector of the ignition switch. Did you find and correct the condition? If yes, go to step 14 . If no, go to step 12 .
11. Inspect for poor connections and terminal tension at the harness connector of the BCM. Did you find and correct the condition? If yes, go to step 14 . If no, go to step 13 .
12. Replace the ignition switch. See appropriate STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT. After ignition switch replacement, go to step 14 .
13. Replace the BCM. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. After BCM replacement, go to next step.
14. Reconnect all disconnected components and connectors. Using a scan tool, under the DIAGNOSTIC CIRCUIT CHECK menu, observe the CLASS 2 POWER MODE parameter. Cycle the ignition switch through all possible positions, one at a time. Does the displayed power mode parameter match the actual ignition switch position? If yes, system is okay. If no, go to step 1 .

RETRIEVING DIAGNOSTIC TROUBLE CODES

DTCs are retrieved using a Tech 2® scan tool, or other OBD-II compatible scan tool connected to OBD-II 16-pin Data Link Connector (DLC). See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS. (Scheme 815) DLC is located below left side of dash.

Scheme 814

CLEARING DIAGNOSTIC TROUBLE CODES

There are 3 methods to clear DTCs.

Scan Tool

Scan tool is preferable way to clear DTC information. Freeze frame and failure record data will also be cleared.

Diagnostic Aids

The I/M System Status display provides an indication of when the control module has completed the required tests. This does not necessarily mean that the test has passed, only that a decision was made. If the diagnostic fails, a DTC will indicate the failure. If a failure indication is present for a DTC associated with one of the I/M regulated systems, the failure indication may prevent other required tests from running. The I/M System Status information may be useful for a technician to determine if diagnostics have run when verifying repairs.

Conditions for Running

Cold Start

1. The Engine Coolant Temperature (ECT) is less than 133°F (56°C).
2. The Intake Air Temperature (IAT) is more than 20°F (7°C).
3. The transmission fluid temperature is between 68-266°F (20-130°C).

If a step is interrupted before completion, perform the remaining portion of the set procedure. Any portion of the set procedure that requires the engine at operating temperature may be repeated. This will allow most of the diagnostic tests to run and the remaining tests can be performed using the individual system set procedures.

The engine coolant temperature (ECT) is between 133-219°F (56-104°C).

If the status does not update, the test outlined in this procedure can be repeated until the I/M System Status updates to YES.

The I/M System Status does not indicate whether the test has passed or failed, only that a decision was made. When all of the diagnostics for a specific system have run and passed, the I/M System Status will update to YES. If a test for a specific system has failed, the I/M System Status will update to YES, indicating a determination was made, even if all of the required tests have not run. When a failure occurs, the Emission Related DTC portion of the I/M System Status display will indicate the Malfunction Indicator Lamp (MIL) is requested. The I/M System Status also registers the number of Diagnostic Trouble Codes (DTCs).

The first failure of a type B DTC does not constitute a final determination of pass or fail, and will not update the I/M System Status to YES. A second trip is required, and all the conditions to run must be met in order for the test to run again. These conditions may include a partial to complete engine cool down.

The I/M System Status will update only when an emission related DTC fails the second time, or when all of the tests pass.

If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the set procedure. If the test does not run after numerous attempts and no DTC is set, review the appropriate scan tool data list and the service information for an indication of why the test does not complete. Some tests may abort due to changes in the conditions while the test is running. For example, changes in engine load, such as a cooling fan or an A/C compressor clutch turning ON, may cause the test to abort.

If a diagnostic test is difficult to run, maintain necessary enable conditions until the system status updates to YES.

1. Did you perform the Inspection/Maintenance (I/M) System Check? If YES, go to next step. If NO, see «INSPECTION/MAINTENANCE SYSTEM CHECK»(ref-158516-S13422433262003100300000) .
2. Ensure the vehicle is within the Conditions for Running specified in the supporting text. Set the vehicle parking brake. Verify the transmission is in Park for automatic transmissions and Neutral for manual transmissions. Turn OFF all of the accessories, e.g., A/C, blower fan, etc. Start the engine, and allow the engine to idle. Allow the engine to idle for the specified time or until the I/M System Status indicator updates to YES. Did the Misfire Monitoring System Status update to YES? If YES, go to step 5 . If NO, go to next step.
3. Observe the DTC information with a scan tool. Does the scan tool indicate any failed DTCs? If YES, see «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-158516-S25875883752003100300000) . If NO, go to next step.
4. Refer to «INSPECTION/MAINTENANCE SYSTEM DTCS»(ref-158516-S33808202992003100300000) to determine which DTCs are required to run in order to complete this test. Observe the Not Ran Since Code Cleared parameter with a scan tool. Determine which of the DTCs required for a YES status has not run. Enter the DTC number in the Specific DTC menu of the scan tool. Operate the vehicle within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC. Repeat the procedure until the scan tool indicates the diagnostic test has run. Repeat steps 4-6 for any additional required DTCs that have not run. Observe the I/M System Status with a scan tool. Did the Misfire Monitoring System Status update to YES? If YES, go to next step. If NO, see «Diagnostic Aids»(ref-158516-S07501171262003111700000) .
5. Observe the Emission Related DTC portion of the I/M System Status with a scan tool. Does the scan tool indicate any Emission Related DTCs set? If YES, «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-158516-S25875883752003100300000) . If NO, system is okay.

1. The Engine Coolant Temperature (ECT) is less than 133°F (56°C).
2. The Intake Air Temperature (IAT) is more than 20°F (7°C).
3. The transmission fluid temperature is between 68-266°F (20-130°C).

If the status does not update, the test outlined in this procedure can be repeated until the I/M System Status updates to YES.

The I/M System Status does not indicate whether the test has passed or failed, only that a decision was made. When all of the diagnostics for a specific system have run and passed, the I/M System Status will update to YES. If a test for a specific system has failed, the I/M System Status will update to YES, indicating a determination was made, even if all of the required tests have not run. When a failure occurs, the Emission Related DTC portion of the I/M System Status display will indicate the Malfunction Indicator Lamp (MIL) is requested. The I/M System Status also registers the number of Diagnostic Trouble Codes (DTCs).

The first failure of a type B DTC does not constitute a final determination of pass or fail, and will not update the I/M System Status to YES. A second trip is required, and all the conditions to run must be met in order for the test to run again. These conditions may include a partial to complete engine cool down.

The I/M System Status will update only when an emission related DTC fails the second time, or when all of the tests pass.

If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the set procedure. If the test does not run after numerous attempts and no DTC is set, review the appropriate scan tool data list and the service information for an indication of why the test does not complete. Some tests may abort due to changes in the conditions while the test is running. For example, changes in engine load, such as a cooling fan or an A/C compressor clutch turning ON, may cause the test to abort.

If a diagnostic test is difficult to run, maintain necessary enable conditions until the system status updates to YES.

1. Did you perform the Inspection/Maintenance (I/M) System Check? If YES, go to next step. If NO, see «INSPECTION/MAINTENANCE SYSTEM CHECK»(ref-158516-S13422433262003100300000) .
2. Ensure the vehicle is within the Conditions for Running specified in the supporting text. Turn OFF all of the accessories, e.g., A/C, blower fan, etc. Start the engine, and allow the engine to idle for 2 minutes. In order for this test to run, the vehicle must operate in the following conditions: Acceleration at part throttle to 50 mph (80 km/h) with this speed maintained until the engine reaches operating temperature. This may be up to 10 minutes depending on the start up coolant temperature. Continue the operating conditions for an additional 3 minutes after the engine reaches operating temperature. After the specified time has elapsed, vehicle requires acceleration at 75 percent throttle until a speed of 68 mph (110 km/h) is attained. Review the I/M System Status display with a scan tool. Did the Component Monitoring System Status update to YES? If YES, go to 5 . If NO, go to next step.
3. Observe the DTC Information with a scan tool. Does the scan tool indicate any failed DTCs? If YES, go to «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-158516-S25875883752003100300000) . In NO, go to next step.
4. Refer to «INSPECTION/MAINTENANCE SYSTEM DTCS»(ref-158516-S33808202992003100300000) to determine which DTCs are required to run in order to complete this test. Observe the Not Ran Since Code Cleared parameter with a scan tool. Determine which of the DTCs required for a YES status has not run. Enter the DTC number in the Specific DTC menu of the scan tool. Operate the vehicle within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC. Repeat the procedure until the scan tool indicates the diagnostic test has run. Repeat steps 4-6 for any additional required DTCs that have not run. Observe the I/M System Status with a scan tool. Did the Component Monitoring System Status update to YES? If YES, go to next step. If NO, see «Diagnostic Aids»(ref-158516-S06249832862003111700000) .
5. Observe the Emission Related DTC portion of the I/M System Status with a scan tool. Does the scan tool indicate any Emission Related DTCs set? If YES, see «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-158516-S25875883752003100300000) . If NO, the system is okay.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DIAGNOSTIC TROUBLE CODE INDEX

Scheme 815

Scheme 816

Scheme 817

Scheme 818

Scheme 819

Scheme 820

Scheme 821

Scheme 822

Scheme 823

Scheme 824

Scheme 825

Scheme 826

Scheme 827

Scheme 828

Scheme 829

Scheme 830

Scheme 831

Scheme 832

Scheme 833

Scheme 834

Scheme 835

Scheme 836

Scheme 837

Scheme 838

Scheme 839

Scheme 840

Scheme 841

Scheme 842

Scheme 843

Scheme 844

Scheme 845

Scheme 846

Scheme 847

Scheme 848

Scheme 849

Scheme 850

Scheme 851

Scheme 852

Scheme 853

Scheme 854

If the condition is intermittent, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.

DIAGNOSTIC TESTS

Note. Before clearing DTCs, perform powertrain diagnostic system check. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM. Record FREEZE FRAME and FAILURE RECORDS for reference during testing. Data will be erased when DTCs are cleared. If ECM is replaced, NEW ECM must be programmed using special manufacturer's equipment. See ENGINE CONTROL MODULE under PROGRAMMING.

Conditions For Running DTC

The engine is cranking or running.

Conditions For Setting DTC

When the engine is cranking or running, the cam sensor pulses received by the ECM do not equal 3 or 0 per 2 crankshaft revolutions.

Action Taken When DTC Sets

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame. and updates the Failure Records.

Conditions For Clearing MIL/DTC

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Inspect the following items

1. A loose CMP sensor causing a variance in the sensor signal.
2. Excessive free play or damage of the timing gears.
3. The Camshaft Reference Signal Missed parameter will only increment for an intermittent. A constant failure of the CMP sensor will not cause the parameter to increment, but will set DTC P0340.

1. DTCs P0192, P0193, or P0641 are not set.
2. The ignition is ON.

The actual FRP is less than 0.0 MPa at 0-400 RPM, or less than 22.5 MPa at more than 600 RPM.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
3. The ECM will limit fuel injection.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

A restricted fuel supply line may cause DTCs P0087 and P1093 to set at the same time. See FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 6.6L SIERRA & SILVERADO - DIESEL article.

1. DTCs P0192, P0193, or P0641 are not set.
2. The ignition is ON.

The actual fuel pressure is more than 167 MPa.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
3. The control module will limit fuel injection and fuel rail pressure.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

There are no driveability concerns associated with the fuel rail pressure regulator unless a DTC is present. The most likely cause of this DTC is sticking fuel rail pressure regulator. If the fuel system pressure is actually too high, a fuel knock and smoke condition will exist.

1. DTCs P0192, P0193, or P0641 are not set.
2. The ignition is ON.

1. The difference between actual and desired FRP is more than 20 MPa.
2. Commanded fuel pump flow is 100 mm 3 /second or less.

Action Taken When DTC Sets - California

1. The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

Action Taken When DTC Sets - Federal

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The Malfunction Indicator Lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stored this information in the Freeze Frame/Failure Records.
4. The driver information center, if equipped, may display a message.

Conditions For Clearing MIL/DTC - California

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Use a scan tool in order to clear the MIL and the DTC.

Conditions For Clearing DTC - Federal

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
3. Use a scan tool in order to clear the DTC.

1. The ignition is on.
2. The commanded FRP regulator is between 400-1500 mA.

The FRP regulator circuit is not between 50-1600 mA.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL/DTC with a scan tool.

1. DTC P016, P0102, P0103, P0112, P0113, P0234, P0236, P0237, P0238, P0335, P0336, P02227, P2228, P2229 are not set.
2. The ignition 1 signal is between 9-18 volts.
3. The engine speed is less than 2500 RPM.
4. The engine speed is steady within a range of 50 RPM.
5. The Accelerator Pedal Position (APP) indicated angle is less than 50 percent.
6. The above conditions are met for more than 2 seconds.

The ECM detects that the actual MAF sensor voltage signal is not within a predetermined range of the calculated MAF value for more than 2 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The Malfunction Indicator Lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Use a scan tool in order to clear the MIL/DTC.

Conditions For Clearing MIL/DTC - Federal

1. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
3. Use a scan tool in order to clear the MIL/DTC.

Inspect for the following conditions

1. Any unmetered air - Any unmetered air that enters the engine downstream of the MAF sensor may cause this DTC to set.
2. A sluggish or unresponsive MAF sensor - A short between the signal circuit of the MAF sensor and the signal circuit of the Intake Air Temperature (IAT) sensor. This will cause the MAF sensor to have a very limited output voltage range.
3. A malfunctioning MAF sensor can cause excessive engine emissions.
4. An open on the 5-volt reference circuit of the Barometric Pressure Sensor (BARO) may cause this DTC to set.
5. A short to ground on the signal circuit of the BARO sensor may cause this DTC to set.
6. This signal circuit of the BARO sensor shorted to 5-volts may cause this DTC to set.
7. An open signal circuit of the BARO sensor may cause this DTC to set.
8. The MAF display should increase from 42-50 g/s at idle to 420 g/s or more at the 2-3 shift during a Wide-Open Throttle (WOT) acceleration. If not, inspect for a restriction in the induction system or the exhaust system.
9. If the condition is intermittent, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

Scheme 855

Scheme 856

Scheme 857

ALTITUDE VERSUS BAROMETRIC PRESSURE

1. The engine is running for more than 2 seconds.
2. The engine speed is more than 500 RPM.
3. The ignition 1 signal is more than 9 volts.
4. The MAF sensor frequency is stable for more than 2 seconds.

The ECM detects that the MAF sensor frequency signal is less than 16 g/s.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Inspect for the following conditions

1. Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components: Any unmetered air - Any unmetered air that enters the engine downstream of the MAF sensor may cause this DTC to set. A sluggish or unresponsive MAF sensor - A short between the signal circuit of the MAF sensor and the signal circuit of the intake air temperature (IAT) sensor. This will cause the MAF sensor to have a very limited output voltage range. Any debris that may be blocking the sensing elements of the MAF sensor. Any water in the air induction system. The MAF display should increase from 42-50 g/s at idle to 420 g/s or more at the 2-3 shift during a Wide-Open Throttle (WOT) acceleration. If not, inspect for a restriction in the induction system or the exhaust system. If the condition is intermittent, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

1. The engine is running for more than 2 seconds.
2. The engine speed is more than 500 RPM.
3. The ignition 1 signal is more than 9 volts.
4. The above conditions are met for more than 2 seconds.

1. the ECM detects that the MAF sensor signal is more than 4.8 volts. This equals a MAF value of more than 490 g/s.
2. The condition is met for more than 2 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. A sluggish or unresponsive MAF sensor. A short between the signal circuit of the MAF sensor and the signal circuit of the Intake Air Temperature (IAT) sensor. This will cause the MAF sensor to have a very limited output voltage range.
2. Any water in the air induction system will skew the sensor and may cause DTC P0103 to set.

Scheme 858

Scheme 859

1. DTCs P0116, P0117 and P0128 are not set.
2. The Engine Coolant Temperature (ECT) is less than 122° F (50° C).

The IAT is more than 298°F (148°C) for 2 seconds.

1. The Engine Control Module (ECM) illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The ECM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the ECM records the operating conditions at the time of the failure. The ECM writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The ECM turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. When the engine is at ambient temperature the IAT sensor and ECT sensor temperatures should be relatively close to each other.
2. If an intermittent condition exists, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

Scheme 860

Scheme 861

1. DTCs P0116, P0117, P0118, or P0128, are not set.
2. The engine run time is more than 8 minutes.

The IAT is less than -38°F(-39°C) for more than 2 seconds.

1. The Engine Control Module (ECM) illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The ECM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the ECM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the ECM records the operating conditions at the time of the failure. The ECM writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The ECM turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. When the vehicle is at ambient temperature the IAT sensor and ECT sensor temperatures should be relatively close to each other.
2. If a short to a separate 5-volt source occurs, this DTC may set. If this condition exists, a continuity test to all other ECM 5-volt reference circuits will be necessary.
3. If an intermittent condition exists, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

1. The ignition is ON.
2. DTCs P0112, P0113, P0117, P0118, P0128, P0601, P0602, P01621, P2610 are not set.
3. The vehicle has a minimum soak time of 8 hours (28800 seconds).

1. If the ECM detect a temperature difference between the ECT sensor and the IAT sensor of more than 252°F (140°C) at start up.
2. The time spent cranking the engine, without starting is more than 10 seconds with a temperature difference between the ECT sensor and the IAT sensor more than 36°F (20°C).
3. If the ECM detects a temperature between the ECT sensor and the IAT sensor of more than 36°F (20°C), then the vehicle must be driven for 5 minutes over 15 MPH. If the IAT sensor temperature decreases more than 12.6°F (7°C), then a block heater is detected and the test is aborted. If the IAT sensor temperature does not decrease, then a block heater was not detected and DTC P0116 sets.

1. The Engine Control Module (ECM) illuminates the Malfunction Indicator Light (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The ECM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the ECM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the ECM records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.
2. A history DTC clears after 40 consecutive warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 40° F (22° C) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 158° F (70° C) during the same ignition cycle.
3. Clear the DTC with a scan tool.

1. DTC P0116 is designed to detect a ECT sensor that is skewed high.
2. An IAT sensor that is skewed low could cause this DTC to set.
3. When testing the ECT sensor or the IAT sensor, the Temperature Vs Resistance table should be used to determine if a skewed sensor is the problem. See «TEMPERATURE VS. RESISTANCE»(ref-158516-S23202488142003100300000) .

The engine run time is more than 10 seconds.

The ECT sensor temperature is more than 300°F (149°C).

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions For Clearing MIL or DTC

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. An overheating condition may cause this DTC to set.
2. After starting the engine, the ECT sensor temperature should rise steadily to about 194°F (90°C) then stabilize after the thermostat opens.
3. Use the Temperature vs. Resistance Value Table in order to test the ECT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor.
4. If an intermittent condition exists, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

The engine has been running for more than 8 minutes.

The ECT sensor temperature is less than -38°F (-39°C) for 10 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. If a short to a separate 5-volt source occurs, this DTC may set.
2. A skewed sensor could result in poor driveability conditions.
3. After starting the engine, the ECT should rise steadily, then stabilize when the thermostat opens.
4. If an intermittent condition exists, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

Scheme 862

Scheme 863

1. DTCs P0112, P0113, P0116, P0117, or P0118, are not present.
2. The coolant temperature is more than 19°F (-7°C).
3. The air temperature is more than 19°F (-7°C) or more.
4. The engine is running less than 22 minutes (1320 seconds).

1. The engine coolant temperature is less than 161°F (72°C).
2. The air temperature is more than 19°F (-7°C).
3. The engine has been operating for more than 22 minutes (1320 seconds).
4. The fuel burned since start up is more than 12 million mm 3 .

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. A DTC P0128 is designed to detect a faulty thermostat.
2. A skewed ECT sensor may cause a P0128 to set.
3. This DTC will not run if either the intake air or coolant temperature is too low at start-up.
4. If an intermittent condition exists, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.
5. Using Freeze Frame/Failure Records may aid in determining the conditions under which the failure occurred.

The ignition is ON.

The fuel temperature sensor is above 252°F (122°C) for more than 5 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. DTCs P0112, P0113, P0183, P0500, P2610 are not set.
2. The engine must be turned OFF for 10 hours or longer.
3. The start-up intake air temperature (IAT) is more than 59°F (15°C).

1. The fuel temperature and the ECT are more than 18°F (9.75°C) of each other at start-up.
2. The IAT has dropped less than 10°F (5.25°C) after running more than 400 seconds above 15 MPH.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. The engine is running.
2. The fuel temperature sensor is continuously monitored by the ECM.

The fuel temperature sensor is more than 248°F (120°C) for 2 seconds; or, the fuel temperature sensor voltage is less than 0.24 volts for 2 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. After starting a cold engine, the fuel temperature should be within a few degrees of the Intake Air Temperature (IAT) sensor.
2. Use the Temperature vs. Resistance table in order to test the fuel temperature sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor could result in poor driveability concerns.
3. If an intermittent condition exists, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

The engine has been running for more than 4 minutes.

The fuel temperature sensor is less then -22°F (-30°C) for 2 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL/DTC with a scan tool.

1. If a short to a separate 5-volt source occurs, this Diagnostic Trouble Code (DTC) may set. If this is the problem, continuity test to all other ECM circuits will be necessary in order to diagnose the specific circuit.
2. After starting a cold engine, the fuel temperature sensor should be within a few degrees of the intake air temperature (IAT) reading.
3. Use the Temperature vs. Resistance table in order to test the fuel temperature sensor at various temperature levels and in order to evaluate the possibility of a skewed sensor.
4. If an intermittent condition exists, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

1. DTCs P0641 or P0651 are not set.
2. The ignition is ON.

The ECM detects the signal circuit is less than 1.2 MPa.

1. The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL/DTC with a scan tool.

1. DTC P0641 or P0651 are not set.
2. The ignition is ON.
3. The system is not in Powerdown Mode.

The ECM detects the signal circuit is more than 175 MPa.

1. The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
3. The control module limits fuel injection and fuel rail pressure.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 864

Scheme 865

1. DTCs U1800, and U2104 are not set.
2. The engine is running.
3. The charging system voltage is between 6-18 volts.

1. The FICM detects an incorrect current on a fuel injector circuit.
2. The condition exists for less than 1 second.

1. The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
3. The control module disables the set of fuel injectors that have a concern.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. DTC P0238 is not set.
2. The engine speed is more than 500 RPM.

The measured boost pressure is above the expected range by 35 kPa or more for 12 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
3. The ECM limits fuel delivery.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. DTC P0238 is not set.
2. The engine speed is less than 2,700 RPM.
3. The fuel quantity is less than 70 mm 3 .
4. The total fuel quantity burned is more than 2,000 mm 3 .

The measured boost pressure is above the expected range by 35 kPa or more for 12 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
3. The ECM limits fuel delivery.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. DTCs P0237, P2227, P2228, P2229 are not set.
2. The engine speed is more than 500 RPM.
3. The total fuel quantity burned is more than 2,000 mm 3 .
4. The engine coolant temperature (ECT) is more than 140°F (60°C).

The measured boost pressure is below the expected range by 35 kPa or more for 12 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 866

Scheme 867

Scheme 868

1. DTC P0237 is not set.
2. The engine speed is between 500-2,700 RPM.
3. The total fuel quantity burned is more than 2,000 mm 3 .
4. The engine coolant temperature (ECT) is more than 72°C (158°F).

The measured boost pressure is below the expected range by 50 kPa or more for 12 seconds.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 869

Scheme 870

Scheme 871

The ignition is ON.

The boost pressure is less than 38 kPa for 2 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
3. The ECM limits fuel delivery.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

The ignition is ON.

The boost pressure is less than 38 kPa for 2 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
3. The ECM limits fuel delivery.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

The ignition is ON.

The boost pressure is less than 38 kPa for 2 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
3. The ECM limits fuel delivery.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

The ignition is ON.

The boost pressure is more than 254 kPa for 2 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
3. The ECM limits fuel delivery.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic
4. Clear the MIL and the DTC with a scan tool.

1. The engine is running at idle for more than 30 seconds.
2. The engine coolant temperature (ECT) is more than 132°F (56°C).

The fuel rate adjustment for more than one cylinder exceeds an acceptable value.

Action Taken When DTC Sets (California)

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Action Taken When DTC Sets (Federal)

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The Malfunction Indicator Lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

Conditions For Clearing MIL/DTC (California)

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Conditions For Clearing MIL/DTC (Federal)

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Use the scan tool to clear the DTC.

A misfire with no other DTCs will be caused by an engine mechanical or fuel injector problem.

Scheme 872

1. The engine is running at idle for more than 90 seconds.
2. The engine coolant temperature (ECT) is more than 132°F (56°C).

The fuel rate adjustment for a cylinder exceeds an acceptable value.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. the control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Use a scan tool in order to clear the MIL and the DTC.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Use a scan tool in order to clear the DTC.

A misfire with on other DTCs will be caused by an engine mechanical or fuel injector problem.

Scheme 873

1. The engine is cranking or running.
2. The Camshaft Position (CMP) sensor signal is present.

The Engine Control Module (ECM) determines no signal from the CKP sensor for less than 8 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. Remove any debris from the ECM connector surfaces before servicing the ECM. Inspect the ECM connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets are installed correctly. The gaskets prevent containment intrusion into the ECM.
2. For any test that requires probing the ECM or the component harness connectors, use the J 35616-A Connector Test Adapter Kit. Using this kit prevents any damage to the harness connector terminals.
3. The following conditions may cause this DTC to set: Any poor connections or poor terminal tension at the sensor. Crankshaft reluctor wheel damage or improper installation. Foreign material passing between the CKP sensor and the reluctor wheel. Insufficient fuel. Excessive air gap between the CKP sensor and the reluctor wheel.
4. Excess crankshaft end play causes the CKP sensor reluctor wheel to move out of alignment with the CKP sensor. This could result in a no start, start and stall or erratic performance.
5. For an intermittent, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

Scheme 874

Scheme 875

The engine is cranking or running.

The Engine Control Module (ECM) determines that the CKP sensor signal is out of range for less than 2 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. An intermittent CKP sensor signal may cause DTC P0336 to set. Wiggle the wiring harness with the engine running and observe the CKP Signal Missed parameter of the scan tool. If the parameter indicates anything other than 0, there is an intermittent condition. For an intermittent, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.
2. A short from the 12 volt reference circuit to the Low reference circuit internally in the Camshaft Position (CMP) or Crankshaft Position (CKP) sensor can cause all 3 DTCs P0336, P0340, P1345 to set.

Scheme 876

1. The ignition is ON.
2. The engine is turning faster than 50 RPM.

The ECM does not see a CMP sensor signal for more than 2 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails.
3. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. An intermittent CMP sensor signal may cause DTC P0340 to set. Wiggle the wiring harness with the engine running and observe the Cam Signal Missed parameter of the scan tool. If the parameter indicates anything other than 0, there is an intermittent condition. If the condition is intermittent, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.
2. A short from the 12-volt reference circuit to the low reference circuit internally in the Camshaft Position (CMP) or Crankshaft Position (CKP) sensor can cause all 3 DTCs P0336, P0340, and P0016 to set.
3. If the CMP sensor signal is lost while running, the engine will operate normally. If the CMP sensor signal is not present on start-up, the engine will not start.

1. The ignition is ON.
2. The engine is turning faster than 50 RPM.

The Engine Control Module (ECM) determines that the CMP sensor signal is out of range for less than 2 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. An intermittent CMP sensor signal may cause DTC P0341 to set. Wiggle the wiring harness with the engine running and observe the Cam Signal Missed parameter of the scan tool. If the parameter indicates anything other than 0, there is an intermittent condition. If the condition is intermittent, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.
2. A short from the 12-volt reference circuit to the low reference circuit internally in the Camshaft Position (CMP) or Crankshaft Position (CKP) sensor can cause DTCs P0336, P0340, P0341 and P0016 to set.
3. If the CMP sensor signal is lost while running, the engine will operate normally. If the CMP sensor signal is not present on start-up, the engine will not start.

Scheme 877

The engine is cranking or running.

The FICM does not receive a crank signal, but does receive injection requests from the ECM; or, receives an invalid crank signal from the ECM.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL/DTC with a scan tool.

A missing high resolution signal will cause a no-start condition.

Scheme 878

Scheme 879

The ignition is ON.

1. The glow plugs are commanded OFF and the glow plug feedback is more than 2 volts.
2. The glow plugs are commanded on and the glow plug feedback is not between 5 volts and 6.2 volts.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Note. If the glow plug relay is stuck in the ON position, check for proper operation of the glow plugs. When the glow plugs are commanded ON by the scan tool, an internal Engine Control Module (ECM) timer protects the glow plugs from damage by cycling them ON for 3 seconds and then OFF for 12 seconds. The glow plug relay battery feed wire nut at the relay should be tested for proper torque. The California glow plug system will send the following voltages, or signals to the ECM. See GLOW PLUG SIGNAL VOLTAGE .

GLOW PLUG SIGNAL VOLTAGE

An intermittent may be caused by the following

1. Poor connections, terminal tension.
2. Rubbed-through wire insulation.
3. Broken wire inside the insulation.
4. A short to battery positive voltage on the glow plug relay control circuit.

The ignition switch is in the ON position.

1. The ECM has commanded glow plugs ON and the glow plug signal voltage is less than 4 volts.
2. The ECM has commanded glow plugs OFF and the glow plug signal voltage is more than 4 volts.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

Conditions For Clearing DTC

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

If the glow plug relay is stuck in the ON position, check for proper operation of the glow plugs. See GLOW PLUG SYSTEM DIAGNOSIS under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 6.6L SIERRA & SILVERADO - DIESEL article. When glow plugs are commanded ON by the scan tool, an internal ECM timer protects the glow plugs from damage by cycling them ON for 3 seconds and the OFF for 12 seconds.

The glow plug output feed wire nut and battery feed wire nut at the relay should be checked for proper torque, 44 INCH lbs. (5 N.m) and for corrosion.

An intermittent may be caused by the following

1. Poor Connections
2. Rubbed Through Wire Insulation
3. Broken Wire Inside The Insulation

1. DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0405, P0406, P0489, P0490, P0500, P0651, P2142, P2144, and P2145 are not set.
2. The ECM is not in the Reduced Engine Power mode.
3. The Engine Run Time parameter is more than 5 seconds.
4. The BARO parameter is more than 72 kPa.
5. The Engine Speed parameter is between 610-820 RPM and is steady within 50 RPM for more than 3 seconds.
6. The ECT Sensor parameter is between 60-100°C (140-212°F).
7. The Calculated Fuel Rate parameter is between 3-20 mm 3 .
8. The power take off (PTO) is disabled, if equipped.
9. The IAT Sensor parameter is more than 0°C (32°F).
10. The APP Indicated Angle parameter is less than 1 percent.
11. The Ignition 1 Signal parameter is between 11-18 volts.
12. The Vehicle Speed Sensor parameter is less than 0.40 km/h (0.25 mph).
13. All of the above conditions are met for more than 3 seconds.

1. The ECM detects a calibrated difference between the expected MAF rate and the actual MAF rate during EGR system operation.
2. The ECM detects no difference between the expected EGR vacuum sensor signal and the actual EGR vacuum sensor signal.
3. The above conditions are met for more than 4 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Inspect the MAF sensor for proper operation. An inaccurate MAF sensor signal may cause this DTC to set. If the condition is determined to be intermittent, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.

Scheme 880

1. DTCs P0101, P0102, P0103, P0112, P0113, P0116, P0117, P0118, P0405, P0406, P0489, P0490, P0500, P0651, P2142, P2144, and P2145 are not set.
2. The EGR valve vacuum control solenoid has been commanded to more than 70 percent.
3. The ECM is not in the Reduced Engine Power mode.
4. The Engine Run Time parameter is more than 5 seconds.
5. The BARO parameter is more than 72 kPa.
6. The Engine Speed parameter is between 610-820 RPM and is steady within 50 RPM for more than 3 seconds.
7. The ECT Sensor parameter is between 60-100°C (140-212°F).
8. The Calculated Fuel Rate parameter is between 3-20 mm 3 .
9. The power take off (PTO) is disabled, if equipped.
10. The IAT Sensor parameter is more than 0°C (32°F).
11. The APP Indicated Angle parameter is less than 1 percent.
12. The Ignition 1 Signal parameter is between 11-18 volts.
13. The Vehicle Speed Sensor parameter is less than 0.40 km/h (0.25 mph).
14. All of the above conditions are met for more than 3 seconds.

1. The ECM detects a lower than expected EGR vacuum sensor signal and a higher than expected MAF rate.
2. The above condition is met for more than 8 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Inspect for the following conditions

1. Vacuum leaks and restrictions in the EGR control system vacuum lines.
2. Vacuum leaks and restrictions in the EGR control system components.
3. A stuck closed EGR vacuum vent solenoid.
4. A stuck closed EGR valve vacuum control solenoid.
5. Proper vacuum line connections.

Scheme 881

Scheme 882

1. DTC P0101, P0489, or P0651 are not set.
2. The ignition is ON.
3. The Ignition 1 Signal parameter is between 11-18 volts.

1. The EGR Position Sensor parameter is less than 19 kPa.
2. The above condition is met for more than 5 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunctions Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL/DTC with a scan tool.

Scheme 883

Scheme 884

1. DTC P0651 is not set.
2. The ignition is ON.
3. The Ignition 1 Signal parameter is between 11-18 volts.

1. The EGR Vacuum Sensor parameter is more than 158 kPa.
2. The above conditions are met for more than 5 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. The Engine Run Time parameter is more than 0.5 seconds.
2. The Ignition 1 Signal parameter is between 11-18 volts.
3. The EGR Solenoid Command parameter is less than 71 percent.

The ECM detects a low voltage condition on the EGR valve solenoid control circuit for more than 2 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic
4. Clear the MIL and the DTC with a scan tool.

Scheme 885

Scheme 886

1. The Engine Run Time parameter is more than 0.5 seconds.
2. The Ignition 1 Signal parameter is between 11-18 volts.
3. The EGR Solenoid Command parameter has been commanded to more than 10 percent.

The ECM detects a high voltage condition on the EGR valve vacuum solenoid control circuit for more than 2 seconds.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 887

1. The battery voltage is between 10-18 volts.
2. The intake air temperature (IAT) is less than 73°F (23°C) with the engine running; or, the coolant temperature is less than 121°F (49°C) with the ignition ON, engine OFF for more than 3 seconds.

1. The heater line voltage is more than 8.1 volts with the relay OFF.
2. OR The heater line voltage is between 3.8-8.1 volts with the ignition OFF.
3. AND The heater line voltage is less than 0.5 volt below battery voltage with the ignition ON.
4. OR The heater line voltage is less than 3.8 volts with the relay OFF.
5. AND The reference line voltage is low with the relay OFF.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. The battery voltage is between 10-18 volts.
2. The intake air temperature (IAT) is less than 23°C (73°F) with the engine running.
3. OR The coolant temperature is less than 49°C (121°F) with the ignition ON, and with the engine OFF for more than 3 seconds.

1. The IAH line voltage is between 3.8-8.1 volts with the IAH relay OFF.
2. The IAH line voltage is less than 0.5 volt below battery voltage with the IAH relay ON.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 888

1. The ignition is ON.
2. DTC U1800 or U2104 are not set.

The FICM detects an internal circuit fault.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 889

The ignition is ON.

The feedback voltage does not match the output state.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 890

The engine is running.

1. The ECM detects a voltage out of tolerance condition on the 5-volt reference A circuit.
2. The above condition is present for longer than 10 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating condition to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

The engine is running.

1. The control module detects that the commanded start of the MIL driver and the actual state of the control circuit do not match.
2. The conditions are present for a minimum of 30 seconds.

The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. A Last Test Failed, or current DTC, clears when the diagnostic runs and does not fail.
2. A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
3. Use a scan tool in order to clear the DTC.

The engine is running.

1. The ECM detects a voltage out of tolerance condition on the 5-volt reference 2 circuit.
2. The above conditions is present for longer than 10 seconds.

Action Take When DTC Sets

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malefaction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

The engine is running.

The TCM is requesting MIL illumination, or that the MIL request circuit is shorted to ground.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed. clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

The ignition is ON.

The ECM is detecting an incorrect voltage level on the TCM MIL request circuit.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunctions Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if not failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 891

Scheme 892

1. DTCs P0192, P0193, or P0641 are not set.
2. The ignition is ON.

The difference between commanded fuel pressure and actual fuel pressure is more than 20 MPa; or, more than 15,000 mm 3 at 800 RPM, or more than 38,000 at 2000 RPM.

1. The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
4. The driver information center, if equipped, may display a message.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Use a scan tool in order to clear the MIL and the DTC.

Conditions For Clearing DTC (Federal)

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
3. Use a scan tool in order to clear the DTC.

This DTC does not set for an idle condition.

A number of conditions may cause DTC P0087 and DTC P1093 to set

1. Excessive fuel return to the tank.
2. A fuel injection pump failure.
3. A fuel pressure regulator (RPCV) failure.

If you have to prime the fuel system, check for the following conditions

1. A restricted fuel supply line.
2. A fuel supply line air leak. Diagnose fuel system. See «FUEL SYSTEMS»(ref-152810-S12921263442003022600000) in BASIC DIAGNOSTIC PROCEDURES - 6.6L SIERRA & SILVERADO - DIESEL article.

A sticking fuel pressure regulator may set this DTC. Diagnose fuel system. See

FUEL SYSTEMS

in BASIC DIAGNOSTIC PROCEDURES - 6.6L SIERRA & SILVERADO - DIESEL article. If the condition is determined to be intermittent, see

INTERMITTENT CONDITIONS

under SELF-DIAGNOSTIC SYSTEM.

1. DTCs P0192, P0193, or P0641 are not set.
2. The ignition is ON.

The difference between FRP sensor and commanded fuel injection pump flow is more than 30 MPa.

1. The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. If you have to prime the fuel system, inspect for a restricted fuel supply line or a fuel supply line air leak. See «FUEL SYSTEMS»(ref-152810-S12921263442003022600000) in BASIC DIAGNOSTIC PROCEDURES - 6.6L SIERRA & SILVERADO - DIESEL article.
2. If the condition is determined to be intermittent, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

Scheme 893

1. The ignition switch is in the crank or run position.
2. the ignition voltage is between 7-16 volts.

1. The ECM detects a condition with more than one APP sensor.
2. All of the conditions present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining two APP sensors to calculate throttle response.
5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount of throttle control. The message center displays Reduced Engine Power.
6. If all 3 APP sensors are out of range, the following occurs
7. The control module commands Reduced Engine Power mode.
8. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle.
9. The message center displays Reduced Engine Power.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

1. APP sensor 1 and APP sensor 3, 5-volt reference circuits are internally connected within the ECM.
2. The APP sensor 2, 5-volt reference circuit is shared with the barometric pressure (BARO) sensor and the turbo boost solenoid and they are internally connected within the ECM.
3. If an intermittent condition is suspected, see «INTERMITTENT CONDITIONS»(ref-158516-S11601437092003100300000) under SELF-DIAGNOSTIC SYSTEM.

1. DTCs P0461, P0462, P0463, P0500, P2066, P2067, or P2068 are not set.
2. The engine is running.
3. The vehicle speed is 0 MPH.
4. The primary fuel level is less than 6.6 gal. (25 L).
5. The secondary fuel level is between 0.8-2.6 gal. (3-10 L).
6. The above conditions are met for 20 seconds before the secondary pump is commanded ON.
7. The secondary fuel pump is commanded ON for 120 seconds.

The ECM detects a primary fuel level increases an a secondary fuel level decreases of less than 1.06 gallons (4 liters) each.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The Malfunction Indicator Lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The drive information center, if equipped, may display a message.

1. A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
2. A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Use a scan tool in order to clear the DTC.

1. The engine is running.
2. The ignition voltage is between 6-18 volts.

1. The ECM detects that the command state and the actual state of the control circuit does not match.
2. The condition exists for less than one second.

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Refer to IDENTIFYING MALFUNCTIONING INJECTOR CONTROL CIRCUITS to determine which fuel injector is malfunctioning.

IDENTIFYING MALFUNCTIONING INJECTOR CONTROL CIRCUITS

1. DTCs P0117, P0118, P1114, and P1115 are not active.
2. The engine is running.

The engine coolant temperature is above 270°F (132°C) for 10 seconds or more.

1. The ECM will illuminate the Malfunction Indicator Lamp (MIL) during the first trip in which the diagnostic test has been run and failed.
2. The ECM will signal the IPC to turn ON the Service Engine Soon indicator.
3. The ECM will alternately disable two groups of four cylinders by turning OFF the fuel injectors.
4. The ECM will store conditions which were present when the DTC set as Freeze Frame and File Records data.

1. The ECM will turn the MIL OFF after 3 consecutive trips that the diagnostic has been run and passed.
2. The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
3. The DTC can be cleared by using the scan tool Clear DTC Information function.

Scheme 894

1. The ignition switch is in the Crank or Run position.
2. The ignition voltage is between 7-16 volts.

1. The ECM microprocessor can not process APP analog data into digital data.
2. The above condition is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. The driver information center, if equipped, may display a message.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 895

1. DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0405, P0406, P0489, P0490, P0500, P0651, P2142, P2144, and P2145 are not set.
2. The EGR valve vacuum control solenoid has been commanded to more than 70 percent.
3. The ECM is not in the Reduced Engine Power mode.
4. The BARO parameter is more than 72 kPa.
5. The Engine Speed parameter is between 610-820 RPM and is steady within 50 RPM for more than 3 seconds.
6. The ECT Sensor parameter is between 60-100°C (140-212°F).
7. The Calculated Fuel Rate parameter is between 3-20 mm 3 .
8. The power take off (PTO) is disabled, if equipped
9. The IAT Sensor parameter is more than 0°C (32°F).
10. The APP Indicated Angle parameter is less than 1 percent.
11. The Ignition 1 Signal parameter is between 11-18 volts.
12. The Vehicle Speed Sensor parameter is less than 0.40 km/h (0.25 mph).
13. The Engine Run Time parameter is more than 5 seconds.
14. All of the above conditions are met for more than 3 seconds.

1. The ECM detects a higher than desired EGR vacuum sensor signal and a lower than expected MAF rate.
2. The above conditions are met for more than 4 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Inspect for the following conditions

1. A stuck open EGR vacuum vent solenoid.
2. A stuck open EGR valve vacuum control solenoid.
3. Proper vacuum line connections.
4. A restriction in the exhaust system causing high back pressure.

1. The ignition is ON.
2. DTC U1800 or U2104 are not set.

The FICM detects low supply voltage.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 896

1. DTC U1800, U2104, or U2106 are not set.
2. The ignition is ON.

The FICM detects current through an internal driver when the driver is OFF

1. The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

There is no external failure that can cause DTC P1658 to set. This DTC is an internal circuit failure. An intermittent or hard code will result in FICM replacement.

Scheme 897

1. DTCs P0641 or P0651 are not set.
2. The ignition switch is in the Crank or Run position.
3. The ignition voltage is between 7-16 volts.

1. The APP sensor 1 voltage is less than 0.25 volt.
2. The above condition is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining two APP sensors to calculate throttle response.
5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount of throttle control. The message center displays Reduced Engine Power.
6. If all three APP sensors are out of range, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle. The message center displays Reduced Engine Power.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 898

Scheme 899

1. DTCs P0641 or P0651 are not set.
2. The ignition switch is in the Crank or Run position.
3. The ignition voltage is between 7-16 volts.

1. The APP sensor 1 voltage is more than 4.75 volts.
2. The above condition is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
3. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining 2 APP sensors to calculate throttle response.
4. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount or throttle control. The message center displays Reduced Engine Power.
5. If all 3 APP sensors are out of range, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle. The message center displays Reduced Engine Power.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 900

Scheme 901

1. DTCs P0641 or P0651 are not set.
2. The ignition is in the Crank or Run position.
3. The ignition voltage is between 7-16 volts.

1. The APP sensor 2 voltage is less than 0.25 volt.
2. The above condition is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining 2 APP sensors to calculate throttle response.
5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount of throttle control. The message center displays Reduced Engine Power.
6. If all 3 APP sensors are out of range, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle. The message center displays Reduced Engine Power.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 902

Scheme 903

1. DTC P0641 or P0651 are not set.
2. The ignition switch is in the Crank or Run position.
3. The ignition voltage is between 7-16 volts.

1. The APP sensor 2 voltage is more than 4.75 volts.
2. The above conditions is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining 2 APP sensors to calculate throttle response.
5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount of throttle control. The message center displays Reduced Engine Power.
6. If all three APP sensors are out of range, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle. The message center displays Reduced Engine Power.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 904

Scheme 905

1. DTC P0641 or P0651 are not set.
2. The ignition switch is in the Crank or Run position.
3. The ignition voltage is between 7-16 volts.

1. The APP sensor 3 voltage is less than 1.49 volts.
2. The above condition is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining two APP sensors to calculate throttle response.
5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount of throttle control. The message center displays Reduced Engine Power.
6. If all 3 APP sensors are out of range, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle. The message center displays Reduced Engine Power.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 906

Scheme 907

1. DTC P0641 or P0651 are not set.
2. The ignition switch is in the Crank or Run position.
3. The ignition voltage is between 7-16 volts.

1. The APP sensor 3 voltage is more than 4.75 volts.
2. The above conditions is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining 2 APP sensors to calculate throttle response.
5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount of throttle control. The message center displays Reduced Engine Power.
6. If all 3 APP sensors are out of range, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle. The message center displays Reduced Engine Power.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 908

Scheme 909

1. DTCs P0641, P0651, P2122, P2123, P2132, P2133 are not set.
2. The ignition switch is in the Crank or Run position.
3. The ignition voltage is between 7-16 volts.

1. The APP sensor 1 and the APP sensor 2 are more than 10 percent out of range of each other.
2. The above condition is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining two APP sensors to calculate throttle response.
5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount of throttle control. The message center displays Reduced Engine Power.
6. If all 3 APP sensors are out of range, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle. The message center displays Reduced Engine Power.

Scheme 910

Scheme 911

Scheme 912

1. DTCs P0641, P0651, P2127, P2128, P2132 and P2133 are not set.
2. The ignition switch is in the Crank or Run position.
3. The ignition voltage is between 7-16 volts.

1. The APP sensor 2 and the APP sensor 3 are more than 10 percent out of range or each other.
2. The above condition is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining two APP sensors to calculate throttle response.
5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount of throttle control. The message center displays Reduced Engine Power.
6. If all 3 APP sensors are out of range, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle. The message center displays Reduced Engine Power.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 913

Scheme 914

1. DTCs P0641, P0651, P2122, P2123, P2132 or P2133 are not set.
2. The ignition switch is i the Crank or Run position.
3. The ignition voltage is between 7-16 volts.

1. The APP sensor 1 and the APP sensor 3 are more than 10 percent out of range of each other.
2. The above condition is present for less than 1 second.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. If one or more APP sensor DTCs are set for a single APP sensor, the following occurs: The control module will not command Reduced Engine Power mode. The control module will use the remaining two APP sensors to calculate throttle response.
5. If certain multiple APP sensor DTCs are set for more than one APP sensor, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to a predetermined value to limit the amount of throttle control. The message center displays Reduced Engine Power.
6. If all 3 APP sensors are out of range, the following occurs: The control module commands Reduced Engine Power mode. The APP indicated angle is limited to 0 percent. The control module only allows the engine to idle. The message center displays Reduced Engine Power.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A History DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non emission related diagnostic.
3. Clear the DTC with a scan tool.

Scheme 915

1. The ignition is ON for more than 0.5 seconds.
2. The EGR throttle valve vacuum control solenoid is commanded OFF.
3. The Ignition 1 Signal parameter is between 11-18 volts.

1. A low voltage condition on the control circuit of the EGR throttle valve vacuum control solenoid is detected by the ECM when the EGR throttle valve vacuum control solenoid is commanded OFF.
2. The above conditions are met for more than 4 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 916

Scheme 917

1. The ignition is on for more than 0.5 seconds.
2. The EGR throttle valve control solenoid is commanded ON.
3. The Ignition 1 Signal parameter is between 11-18 volts.

1. A high voltage condition on the control circuit of the EGR throttle valve vacuum control solenoid is detected by the ECM when the EGR throttle valve vacuum control solenoid is commanded ON.
2. The above conditions are met for more than 4 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 918

Scheme 919

1. The ignition is ON.
2. The EGR vacuum vent solenoid is commanded OFF.
3. The Ignition 1 Signal parameter is between 11-18 volts.

A low voltage condition on the control circuit of the EGR vacuum vent solenoid is selected by the ECM when the EGR vacuum vent solenoid is commanded OFF.

The above conditions are met for more than 4 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 920

Scheme 921

1. The ignition is ON for more than 0.5 seconds.
2. The EGR vacuum vent solenoid is commanded ON.
3. The Ignition 1 Signal parameter is between 11-18 volts.

1. High voltage condition on the control circuit of the EGR vacuum vent solenoid is detected by the ECM when the EGR vacuum vent solenoid is commanded ON.
2. The above conditions are met for more than 4 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 922

Scheme 923

1. The ignition is ON.
2. DTC U1800, or U2104 are not set.

The ECM detects a circuit fault related to the high voltage circuit to cylinders 1, 4, 6, and 7.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Scheme 924

1. The ignition is ON.
2. DTC U1800, or U2104 are not set.

The ECM detects a circuit fault related to the high voltage circuit to cylinders 2, 3, 5, and 8.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL/DTC with a scan tool.

Condition For Running DTC

1. DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0236, P0237, P0238, P0335, P0336, P0404, P0405, P0406, P0500, P2228, P2229 is not set.
2. The engine speed is between 500-3600 RPM.
3. The engine run time is more than 8 seconds.
4. The vehicle speed is less than 100 mph (161 km/h).
5. The Mass Air Flow (MAF) is less than 444 g/s.
6. The Engine Coolant Temperature (ECT) is more than 20°C (68°F).
7. The Exhaust Gas Recirculation (EGR) system is not active.
8. The Power Take Off (PTO) is OFF.
9. The above conditions exist for 5 seconds.

The difference between the BARO sensor and the EGR vacuum sensor is more than 10 kPa for 10 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0236, P0237, P0238, P0335, P0336, P0500, P2228, P2229 is not set.
2. The engine speed is between 500-900 RPM.
3. The engine run time is more than 20 seconds.
4. The accelerator pedal angle is less than 20 percent.
5. The vehicle speed is less than 40 km/h (25 mph).
6. The Mass Air Flow (MAF) is less than 50 g/s.
7. The Engine Coolant Temperature (ECT) is more than 80°C (176°F).
8. The Power Take Off (PTO) is OFF.
9. The above conditions exist for 5 seconds.

The difference between the BARO sensor and the boost sensor is more than 20 kPa for 2 seconds.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

The engine is running.

The BARO is less than 44 kPa for 10 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

The ignition is ON.

The BARO is less than 44 kPa for 2 seconds.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The Malfunction Indicator Lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

The engine is running.

The BARO is more than 110 kPa for 10 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

The ignition is ON.

The BARO is more than 110 kPa for 2 seconds.

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The Malfunction Indicator Lamp (MIL) will not illuminate.
3. The control module records the operating condition s at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

1. DTCs P0101, P0102, P0103, P0112, P0113, P0116, P0117, P0118, P0405, P0406, P0489, P0490, P0500, P0651, P2141, P2142, P2144, P2145, P2227, P2228, P2229 are not set.
2. The engine is running for more than 60 seconds.
3. The Barometric Pressure (BARO) sensor pressure is more than 72 kPa (10 psi).
4. The ignition 1 voltage is between 9-16 volts.
5. The vehicle speed is less than 1.6 km/h (1 mph).
6. The engine speed is between 600-700 RPM.
7. The coolant temperature is between 0-80°C (32-176°F).

1. The ECM detects an intake leak that is more than the calibrated value, internal to the ECM.
2. The condition is met for 2 seconds.

1. The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

1. The most likely cause of the DTC is a leaking intake duct after the MAF sensor.
2. To run the diagnostic test the following conditions must be met: The engine is at full operating temperature. The vehicle is in drive. The vehicle has been idling for more than 1 minute.
3. After meeting these conditions, shift the vehicle into park, and hold the engine speed steady between 1,500-2,100 RPM for 30 seconds. If the diagnostic test still fails to run, the vehicle must be driven.