GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Connector End View Reference: Engine Electrical Connector End Views or Engine Control Module Connector End Views in Engine Controls - 2.2 L (L61) or Powertrain Control Module Connector End Views in Engine Controls - 2.0 L (LSJ)

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Turn ON the ignition, with the engine OFF.

Does the battery charge indicator illuminate?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Install a scan tool.
  2. With a scan tool, command the lamp and gages On and Off.

Does the charge indicator turn On and Off with each command?

Go to Step 4

Go to Step 7

4

Test the generator turn on signal circuit for a short to ground or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 5

5

Inspect for poor connections at the harness connector of the engine control module (ECM)/powertrain control module (PCM). Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 6

6

Important: The replacement ECM/PCM must be programmed.

Replace the ECM/PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 8

--

7

Replace the instrument panel cluster. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2