GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Starting and Charging Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Disconnect the generator harness connector.
  2. Start the engine.

Does the charge indicator illuminate?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Test the generator L-terminal signal circuit a short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 6

Go to Step 4

4

Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 6

Go to Step 5

5

Important: Perform the set up procedures for the PCM.

Replace the PCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 6

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6

Operate the system for which the symptom occurred.

Did you correct the condition?

System OK

Go to Step 2