Strategy Based Diagnostics
- Perform the
Diagnostic System Check - Engine Controls
in Engine Controls before using the symptom
tables, if applicable.
- Review the system operations in order to familiarize yourself
with the system functions. Refer to
Disassembled Views
,
Engine Component Description
,
Lubrication Description
,
and Drive Belt System Description.
All diagnosis 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. For
a detailed explanation, refer to Strategy Based Diagnosis in General Information.
Visual/Physical Inspection
| • | Inspect for aftermarket devices which could affect the operation
of the Engine. Refer to Checking Aftermarket Accessories in Wiring Systems. |
| • | 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:
| • | Drive Belt Chirping Diagnosis |
| • | Drive Belt Squeal Diagnosis |
| • | Drive Belt Whine Diagnosis |
| • | Drive Belt Rumbling Diagnosis |
| • | Drive Belt Vibration Diagnosis |
| • | Drive Belt Falls Off Diagnosis |
| • | Drive Belt Excessive Wear Diagnosis |
| • | Drive Belt Tensioner Diagnosis |
