GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Engine running.
  2. Connect a scan tool and monitor the system voltage.

Is the voltage greater than the specified value?

10.6 Volts

Go to Step 2

Go to Step 4

2

  1. Turn key to the LOCK position.
  2. Disconnect the PCM connector C2.

    Turn the ignition switch to the RUN position.

Does the volt indicator or check gauges message with engine telltale sill on.

--

Go to Step 3

Go to Step 5

3

Refer to instrument cluster section for diagnosis.

Is repair completed?

--

Go to Starter and Charging System Check

--

4

Perform the generator function test.

Is repair completed?

--

Go to Starter and Charging System Check

--

5

Check for open or poor contact terminal at the PCM connector C2.

Is repair completed?

--

Go to Starter and Charging System Check

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