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| • | Review the exhaust system description in order to familiarise yourself with the exhaust system components and the intended function of the components. Refer to Exhaust System Description . |
| • | All diagnostics on a vehicle should follow a logical process. Strategy Based diagnostics is a uniform approach for repairing all systems. The diagnostic flow is the place to start when repairs are necessary and may always be used in order to resolve a system problem. For a detailed explanation, refer to Strategy Based Diagnosis . |
| • | Inspect for aftermarket or non-OEM devices such as, but not limited to; tailpipe extensions, headers, and exhaust cutouts. Any aftermarket exhaust system devices could affect the operation and proper performance of the exhaust system. |
| • | Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, engine temperature, engine load, and frequency of concern. |
| • | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause any symptom. |
Test the vehicle under the same conditions that the customer reported in order to verify the system is operating as designed.
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
| • | Loss of power |
| Refer to Restricted Exhaust |
| • | Poor acceleration |
| Refer to Restricted Exhaust |
| • | Poor fuel economy |
| Refer to Restricted Exhaust |
| • | Excessive smoke diesel |
| Refer to Restricted Exhaust |
| • | Exhaust hissing noise |
| Refer to Exhaust Leakage |
| • | Exhaust popping noise |
| Refer to Exhaust Leakage |
| • | Exhaust rattle noise |
| Refer to Exhaust Noise |
| • | Loud exhaust noise |
| Refer to Exhaust Noise |
| • | Exhaust buzz, groan, hum noise |
| Refer to Exhaust Noise |
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