Inspection And Verification
WARNING: This page is about a different variant/trim than selected.
CAUTION:
Diagnosis by substitution from a donor vehicle is NOT
acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.
NOTE:
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
- Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage.VISUAL INSPECTION
MECHANICAL ELECTRICAL - Engine breather system
- Oil separator
- Exhaust Gas Recirculation (EGR) pipes/hoses (check for cracks)
- Exhaust Gas Recirculation (EGR) valve(s)
- Exhaust Gas Recirculation (EGR) cooler(s)
- Vacuum system
- Fuse(s)
- Wiring harness
- Loose or corroded electrical connector(s)
- Intake air shut off throttle
- Exhaust Gas Recirculation (EGR) valve(s)
- Powertrain Control Module (PCM)
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, verify the symptom and refer to the SYMPTOM CHART , alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC INDEX .