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 inspection. |
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 Inspection
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 checks
and can save valuable time. This check should include the
following areas:
| • | Inspect the Powertrain Control Module (PCM) grounds for being
clean, tight, and in their proper location. |
| • | Inspect vacuum hoses for splits, kinks, and proper connections,
as shown on the 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 the throttle body mounting area, mass
air flow (MAF) sensor and intake manifold sealing surfaces. |
| • | Inspect the wiring harness for poor connections, pinches, cuts,
or other damage. |
| • | Inspect for loose, damaged, or missing sensors/components. |
Use the following tables when diagnosing a symptom complaint:
