Before Using This Section
Before using this section, you should have performed the Diagnostic System Check
- Engine Controls and determined that the following criteria:
- The control module and the malfunction indicator lamp (MIL) are operating
correctly.
- There are no diagnostic trouble codes (DTCs) stored, or a DTC exists but
without MIL.
Several of the following symptom procedures call for a careful visual and physical
inspection. The visual and physical inspection is very important. The inspection can
lead to correcting a problem without further inspection which may save valuable time.
Visual and Physical Inspection
Inspect the following items:
| • | The control module grounds for being clean, tight, and in their proper
location. |
| • | The vacuum hoses for splits, kinks, and proper connections, as shown on
the Vehicle Emission Control Information label. |
| • | The wiring for the following items: |
| • | Inspect for the installation of any Power Enhancing Devices. It may be
necessary to remove these items for proper diagnosis. |
| • | The following symptom tables contain groups of possible causes for each
symptom. The order of these procedures is not important. If the scan tool readings
do not indicate the problems, then proceed in a logical order, easiest to inspect
or most likely to cause first. In order to determine if a specific vehicle is using
a particular system or component, refer to
Engine Controls Schematics
for an application. |
Verify Customer's Concern
Locate the correct symptom table. Inspect the items indicated under that symptom
from the following symptom tables:
