Important Preliminary Checks Before Starting
Before using the Symptom tables:
| • | Perform the Diagnostic System Check-Engine Controls. Verify
all of the following items: |
| - | The powertrain control module (PCM) and the malfunction indicator
lamp (MIL) are operating correctly. |
| - | There are no DTCs stored. |
| • | Verify the customer complaint. |
| • | Perform the visual and 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, 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 and physical
inspection. This can lead to correcting a problem without further inspections
and can save valuable time. This inspection should include the
following areas:
| • | Verify that the PCM grounds are clean, tight, and in the correct
locations. |
| • | Inspect the vacuum hoses for splits, kinks, and correct 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 mass airflow (MAF) sensor and the throttle body. |
| • | Inspect for air leaks at the throttle body mounting area, the
MAF sensor, and the intake manifold sealing surfaces. |
| • | Inspect the wiring harness for poor connections, pinches, cuts,
or other damage. |
| • | Inspect for loose, damaged, or missing sensors and components. |
The following symptom tables are located in this section:
