Diagnostic Procedures
WARNING: This page is about a different variant/trim than selected.
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
- If a MAP or MAF DTC is present, diagnose affected DTCs first. If no other DTCs are present, go to next step.
- Inspect exhaust system for modifications from original parts or leaks. Repair as necessary. After repairs, go to step 7. If exhaust system is okay, go to next step.
- Check EGR valve gasket and pipe for leaks. Repair or clean EGR components as necessary. After repairs, go to step 7. If EGR components are okay, go to next step.
- Remove EGR valve. Check EGR pintle and passages for leak or restriction. Repair or replace as necessary. After repairs, go to step 7. If EGR valve is okay, go to next step.
- Remove EGR inlet and outlet pipes from exhaust and intake manifolds. Check for leaks or restrictions. Repair as necessary. After repairs, go to next step. If repairs were not required, problem is intermittent. See DIAGNOSTIC AIDS .
- Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2.
- Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test.