EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-74 90-860074--1 FEBRUARY 2002
Troubleshooting Charts
IMPORTANT PRELIMINARY CHECKS
BEFORE USING THIS SECTION
Before using this section you should have determined that:
1. The ECM is operating correctly.
2. There are no diagnostic trouble codes (DTC) stored.
SYMPTOM
Verify the customer complaint, and locate the correct symptom. Check the items
indicated under that symptom.
VISUAL/PHYSICAL CHECK
Several of the symptom procedures call for a careful visual/physical check.
The importance of this step cannot be stressed too strongly. It can lead to cor-
recting a problem without further checks and can save valuable time. These
checks should include:
1. ECM grounds and sensors for being clean, tight and in their proper locations.
2. Fuel lines or hoses for splits, kinks, and proper connections. Check thoroughly
for any type of leak or restriction.
3. Air leaks at intake manifold sealing surfaces.
4. Wiring for proper connections, pinches and cuts.
5. Salt corrosion on electrical connections.
6. Ensure engine is in good mechanical condition.
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