| Diagnosis and Testing Inspection and Verification - Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart | Mechanical | Electrical | - Exhaust gas recirculation (EGR) valve
- EGR valve tube
- EGR mixer tube
- EGR cooler
- Gaskets/seals
- Hose(s)/hose joints
| - Fuse(s)
- Wiring harness
- Electrical connector(s)
- Relay(s)
- Sensor(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 WDS to diagnose the system.
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