Diagnostic Aids

Carbon build-up around EGR pintle bore opening may restrict exhaust gas flow, causing DTC to set. Ensure EGR valve is not stuck or carbon plugged. Check EGR valve operation.

An intermittent malfunction may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside insulation. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, or poor terminal-to-wire connections before component replacement.