Strategy Based Diagnostics
- Perform the
Diagnostic System Check - Engine Controls
in Engine Controls - 3.5L (L66) 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
Intake Rocker Arm Control System Operation
.
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 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 ensure 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:
