1. Disconnect the generator connector.
2. Turn the ignition switch to RUN with the engine OFF.
3. Connect a voltmeter set at DC scale between the generator connector terminal L (V8 VIN P) or terminal B (V6 VIN K) and ground.
4. (V6 VIN K) Using a scan tool, command the powertrain control module (PCM) to turn the generator on.

Is the reading greater than the specified value?

0 V

Go to Step 2

Go to Step 3

Move the voltmeter lead from terminal L (V8 VIN P) or terminal B (V6 VIN K) to the generator BATT terminal.

Is the reading greater than specified value?

0 V

Go to Step 4

Go to Step 5

1. (V8 VIN P) Check for an open or poor connection in circuit 225 between the generator terminal L and the instrument cluster terminal A14.
2. Check for an open fuse 9 or circuit 39 to the instrument cluster. (If fuse 9 or circuit 39 is open, the instrument cluster will not operate correctly.)
3. If OK, service instrument cluster.
4. (V6 VIN K) Check for an open or poor connection in circuit 25 between the generator connector terminal B and the powertrain control module (PCM). IF OK refer to Engine Controls

Is the repair complete?

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System OK

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1. Connect the generator connector.
2. Run the engine at fast idle with all of the accessories OFF.
3. Connect a voltmeter set at the DC scale across the battery terminals.

Is the reading within the specified value?

13.5-15.5 V

Go to Step 6

Go to Step 7

Repair open in circuit 1 between the generator BATT terminal and the battery.

Is the repair complete?

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System OK

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1. Load test the generator.
2. Replace the generator if necessary. Refer to Generator Replacement .
3. If the generator is OK, perform the Parasitic Load Test. Refer to Battery Electrical Drain/Parasitic Load Test .

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Repair or replace the generator. Refer to Generator Replacement

Is the repair complete?

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System OK

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