Strategy Based Diagnostics
- Perform the
Diagnostic Starting Point - Engine Controls
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:
