Strategy Based Diagnostics
- Perform the
Diagnostic System Check - Vehicle before using the symptom tables, if applicable.
- Review the system operations in order to familiarize yourself with the system functions. Refer to
Disassembled Views and
Engine Component 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 may always be used in order to resolve a system condition. The diagnostic flow is the place to
start when repairs are necessary.
Visual/Physical Inspection
| • | Inspect for aftermarket devices which could affect the operation of the engine. |
| • | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. |
| • | Inspect for the correct oil level, proper oil viscosity, and correct filter application. |
| • | Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, ambient temperature, engine temperature, amount of engine warm-up time, and other specifics. |
| • | Compare the engine sounds, if applicable, to a known good engine and make sure you are not trying to correct a normal condition. |
Intermittent
Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
