Important Preliminary Checks Before Starting
Before using the Symptom tables:
| • | Perform the Powertrain On-Board Diagnostic (OBD) System Check
and verify all of the following items: |
| • | 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 checks
and can save valuable time. This check should include the following
areas:
| • | Check 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. Check thoroughly
for any type of leak or restriction. |
| • | Check the air intake ducts for collapsed or damaged areas, especially
between the MAF sensor and the throttle body. |
| • | Check for air leaks at 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. |
| • | Check for loose, damaged or missing sensors/components. |
The following Symptom tables are located in this section:
