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
in the 6.6L Section of the Unit Repair Manual, and to the
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 problem.
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. |
| • | 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:
