Strategy Based Diagnostics
- Perform a
Diagnostic System Check - Engine Controls
in Engine Controls - 4.0L 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
,
Drive Belt System Description
,
Lubrication Description
and
New Product Information
.
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 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:
