Diagnostic Test
- NO RESPONSE NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red.
Does the scan tool display a Vehicle Network problem or NO RESPONSE condition?
Yes
- Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing and perform the appropriate No Response diagnostic procedure.
No
- Go to step 2
- NO START
Does the vehicle have a NO START condition?
Yes
- Check the vehicle for any DTCs, including Vehicle Theft Security related DTCs, that may cause a no-start condition.
- If no DTCs are present that relate to a no-start condition. Refer to DIAGNOSIS AND TESTING for procedures related to Fuel and Starting.
No
- Go to step 3
- VEHICLE REPAIR HISTORY AND TSB(s)
- Check the vehicle repair history for repairs that may relate to the current condition.
- Inspect the vehicle for aftermarket accessories that may have been installed incorrectly.
- Check for any Technical Service Bulletins (TSBs) related to the condition or DTCs.
- If a TSB applies, follow the procedure outlined in the TSB.
Select the appropriate response for the condition that applies:
Performing a TSB procedure repaired the condition.
- Test Complete.
- Perform the ECM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
A DTC is present, no TSB applies, or the TSB didn't repair the condition.
- Go to step 4
No DTCs or conditions are present.
- See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure and perform the INTERMITTENT DTC diagnostic procedure.
- VEHICLE INSPECTION WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near pulleys, belts or fan. Do not wear loose clothing.
- Based on the diagnostic condition that applies, review the following list and perform any tests that relate to the condition:
- If multiple DTCs are set in the ECM, review the wiring schematics for problems in any shared supply or ground circuits. Refer to DIAGNOSIS AND TESTING and perform the CHECKING THE ECM POWER AND GROUND CIRCUITS diagnostic procedure.
- Inspect the air intake system and turbocharger related tubes for damage, restriction, or poor connection.
- Inspect the exhaust system and related tubes for damage, restriction, or poor connection.
- Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause an air flow restriction.
- If the ECM detects and stores a DTC, the ECM also stores the environmental conditions under which the DTC was set.
- Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
- Using the scan tool, Clear the stored DTCs.
- Attempt to duplicate the environmental conditions under which the DTC was set.
- Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the vehicle conditions under which the DTC conditions will be monitored. Operate the vehicle under those conditions.
- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the component and the module.
- If the DTCs are fuel or air related, check the fuel level and quality.
Were any repairs made that corrected the DTC or condition?
Yes
- Test complete.
- Perform the ECM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
No
- Perform the appropriate diagnostic procedure.
- Based on the diagnostic condition that applies, review the following list and perform any tests that relate to the condition: