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| • | Review the Exhaust System Description and Operation in order to familiarise yourself with the system functions. 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. |
| • | Inspect for aftermarket or non-OEM devices such as, but not including; tailpipe extensions, headers, and exhaust cutouts. This 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.
| • | 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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