Important Preliminary Checks
Checks
| Action
|
Before Using This Section
| Before using this section, you
should have performed the Powertrain On-Board Diagnostic System Check . Refer
to
Powertrain On Board Diagnostic (OBD) System Check
. Several of the following symptom procedures
call for a careful visual and physical check. The visual and physical
checks are very important. These checks can lead to correcting a problem
which may save valuable time.
|
Visual and Physical Checks
|
| • | Check the VCM grounds for being clean, tight and in their proper
location. Refer to Vehicle Control Module Description
. |
| • | Check the vacuum hoses for splits, kinks and proper connections,
as shown on the Vehicle Emission Control Information label. |
| • | Check thoroughly for any type of leak or restriction. |
| • | Check for air leaks at all the mounting areas of the intake manifold
sealing surfaces. |
| • | Check the ignition wires for the following conditions: |
| • | Check the wiring for the following items: |
| • | The following symptom tables contain groups of possible causes
for each symptom and cover several engines. The following symptom tables cover
several engines. 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 check or most likely to cause first.
In order to determine if a specific vehicle is using a particular
system or component, refer to the Control Module Wiring Diagrams
for an application. |
|
Symptom
|
- Verify the customer complaint.
- Locate the correct symptom table.
- Check the items indicated under that symptom.
Use the following tables when diagnosing a symptom complaint.
|
