Strategy Based Diagnostics
- Perform a Diagnostic System Check - Vehicle in Vehicle DTC Information
before using the symptom tables.
- Review the system operations in order to familiarize yourself with the
system functions. Refer to
Disassembled Views,
Engine Component Description,
Lubrication Description, Displacement on Demand (DoD) System Description
in Engine Controls - 6.0L 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. |
| • | 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:
