Turn all electrical loads OFF. Start the engine and allow it to idle briefly. Use a DMM to check the voltage across the battery terminals.

Is the voltage within the specified range?

13.0-16.0 V

Go to Step 2

Go to Step 5

Compare the DMM reading with a reading taken at the same time (engine at idle) from the vehicle voltmeter.

Is the difference between the vehicle voltmeter reading and the DMM reading within the specified range?

2 V

Go to Step 3

Go to Step 6

Increase the engine speed to 2500 RPM. Use a DMM to check the voltage across the battery terminals.

Is the voltage within the specified range?

13-16 V

Go to Step 4

Go to Step 5

Compare the DMM reading with a reading taken at the same time (engine at 2500 RPM) from the vehicle voltmeter.

Is the difference between the vehicle voltmeter reading and the DMM reading within the specified range?

2 V

System OK

Go to Step 6

Perform the Charging System Check .

Is the generator OK?

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Go to Step 7

Go to Step 8

Repair the PCM and/or Instrument cluster for an incorrect voltmeter reading condition.

Is the repair complete?

--

Go to Step 1

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1. Disconnect the battery negative cable.
2. Disconnect and clean all connections between the battery positive terminal and the generator output terminal.
3. Disconnect and clean all connections in the ground circuit between the battery negative terminal and the generator housing. Check all cables for an intermittent open condition.
4. Connect the battery negative cable.

Is the repair complete?

--

Go to Step 1

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Replace the generator. Refer to Generator Replacement .

Is the repair complete?

--

Go to Step 1

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