Important Preliminary Checks
Checks
| Action
|
Before
Using This Section
| Before using this section, you should have performed the Diagnostic
System Check-Engine Controls. Refer to
Diagnostic System Check - Engine Controls
. 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 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.
|
