Important Preliminary Checks Before Starting
Before using the Symptom tables:
| • | The PCM and Malfunction Indicator Lamp (MIL) are operating correctly. |
| • | There are no DTCs stored. |
| • | Verify the customer complaint. |
| • | Perform the Visual/Physical check. |
Locate the correct symptom in the list at the end of this section. Follow
the procedures in the appropriate diagnostic table. If the problem can not
be duplicated, also refer to
Intermittent Conditions
.
Visual/Physical Check
Notice: Use the connector test adapter kit J 35616-A for any test that
requires probing the following items:
| • | The PCM harness connectors |
| • | The electrical center fuse/relay cavities |
| • | The component terminals |
| • | The component harness connector |
Several of the symptom procedures call for a careful Visual/Physical
inspection. This can lead to correcting a problem without further inspections
and can save valuable time. This inspect should include the
following areas:
| • | Inspect the PCM grounds for being clean, tight, and in their
proper location. |
| • | Inspect vacuum hoses for splits, kinks, and proper connections,
as shown on Vehicle Emission Control Information label. Inspect thoroughly
for any type of leak or restriction. |
| • | Inspect the air intake ducts for collapsed or damaged areas,
especially between the MAF sensor and the throttle body. |
| • | Inspect for air leaks at throttle body mounting area, Mass Air
Flow (MAF) sensor and intake manifold sealing surfaces. |
| • | Inspect the wiring harness for faulty connections, pinches, cuts
or other damage. |
| • | Inspect for loose, damaged or missing sensors/components. |
Use the following tables when diagnosing a symptom complaint:
