1. Connect a scan tool to the data link connector.
2. Turn the ignition switch ON and check for Diagnostic Trouble Codes (DTCs).

Are any Powertrain Control Module (PCM) DTCs present?

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Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.8L or Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 4.6L

Go to Step 2

1. Check the connections at the battery.
2. Check the connections at the generator.

Was a poor connection found?

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Go to Step 6

Go to Step 3

Check the battery charge.

Is the battery fully charged?

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Go to Step 4

Go to Step 7

1. Turn all the electical loads off.
2. Connect the volt meter to the generator output.
3. Run the engine at 2500  RPM for 30 seconds.
4. Check the voltage output.

Is the voltage output at the specified value?

14 V*

Go to Step 5

Go to Step 8

1. Connect the inductive ammeter to the battery charging cable from the generator at the underhood junction block.
2. Connect the carbon pile (VAT 40) across the battery.
3. Run the engine at 2500 RPM.
4. Adjust the carbon pile in order to obtain the maximum output from the generator.

Is the output is within 15 amps of the rated output?

124 A

System OK

Go to Step 8

Repair the connector as required.

Is the circuit repair complete?

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Go to Step 3

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Charge the battery. Refer to Battery Charging .

Is the battery fully charged?

Go to Step 4

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Replace the generator.

Is the replacement complete?

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System OK

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* Cold engine temperature voltage 14.0 - 16.0. The voltage should be between 13.0 and 15.0 when the engine is at the operating temperature.