Strategy Based Diagnostics
- Perform A Diagnostic System Check 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
, and
Lubrication 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 problem. 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. |
| • | Check 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:
