Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

With ignition OFF, install the Midtronics Digital Battery Analyzer and verify the condition of the battery.

Is the battery sufficiently charged for testing?

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Go to Step 3

Go to Battery Inspection/Test

1. Disconnect the Midtronics Digital Battery Analyzer.
2. Connect the Sun Vat 40 tester or equivalent to the battery.
3. Turn the ignition to the OFF/LOCK position.
4. Observe and record the battery voltage reading at the battery terminals on the Sun Vat 40 tester.
5. Start the engine and observe the system voltage reading on the tester.

Does the voltage increase from the first specified (engine OFF) to the second (engine ON) specified range?

Engine Off = B+ Engine On = 13.9 - 15.5 V

Go to Step 4

Go to Step 6

1. Turn on the following accessories:

•	Headlights - Hi beams

•	A/C on Max

•	Blower Fan - On high

•	Rear window defogger

•	Heated seats (If equipped)

2. Maintain engine speed at 2500 RPM.

Is voltage still within the specified value?

13.9 - 15.5 V

Go to Step 5

Go to Step 6

1. Turn OFF all accessories.
2. Turn OFF the ignition.
3. Connect a carbon pile tester to the vehicle.

Important: When measuring generator output current, be sure the inductive probe encircles the generator output wire.

4. Connect an inductive ammeter probe to the output circuit of the generator.
5. Start the engine.
6. Increase engine speed to 2,500 RPM.
7. Adjust the carbon pile as necessary in order to obtain the maximum current output.

Is the generator output greater than or equal to the load test value as specified in Generator Usage ?

System OK

Go to Step 8

1. Turn the engine OFF.
2. Disconnect the generator harness connector.
3. Turn the ignition to the ON position.
4. Using a DMM, measure the voltage on the L terminal circuit.

Is the voltage greater than the specified value?

0 V

Go to Step 9

Go to Step 7

1. Turn the engine OFF.
2. Start the engine and check the voltage on the L terminal.

Is the voltage within the specified value?

5 V

Go to Step 15

Go to Step 10

1. Turn the engine OFF.
2. Inspect the generator B+ output terminal at the generator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 11

Test the L terminal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 12

Test the L terminal circuit for open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 12

Inspect for poor connections at the generator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

Go to Step 14

Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 13

Important: The replacement PCM must be programmed.

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

Did you complete the replacement?

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Go to Step 15

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Replace the generator. Refer to Generator Replacement .

Did you complete the replacement?

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Go to Step 15

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Operate the vehicle in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2