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P0401- EGR SYSTEM PERFORMANCE For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes INTERMITTENT CONDITION EGR VALVE INTAKE OR EXHAUST SYSTEM PROBLEM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. VERIFY ACTIVE DTC With the scan tool, erase ECM DTC’s Test drive the vehicle. With the scan tool, read ECM DTC’s Did this DTC set again? Yes >> Refer to symptom CHECKING THE EGR SYSTEM for further diagnosis. No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 1111 |