Perform the Charging System Check .

Is the generator OK?

--

Go to Step 2

Go to Step 13

1. Turn OFF all accessories. Connect the generator 4-way connector (if disconnected).
2. Start the engine and run at 2500 RPM.
3. Check the voltage across the battery terminals.

Is the voltage within the specified range?

13-16 V

Go to Step 3

Go to Step 5

Stop the engine. Perform the Battery Electrical Drain/Parasitic Load Test .

Is the parasitic load below the specified value?

22 ma

System OK

Go to Step 4

Determine the source of the excessive parasitic drain and repair as necessary.

Is the repair complete?

--

System OK

--

Was the voltage across the battery terminals with the engine running at 2500 RPM too low?

--

Go to Step 6

Go to Step 9

1. Disconnect the generator 4-way connector. Turn the ignition switch to RUN.
2. Use a J 39200 in order to measure the CKT 225 voltage in cavity B of the generator connector.

Is the voltage above the specified value?

12 V

Go to Step 7

Go to Step 10

Check CKT 225 between the generator and the PCM for an Intermittent shorted/grounded condition or a poor connection.

Is CKT 225 OK?

--

Go to Step 14

Go to Step 8

Repair CKT 225 as necessary. Refer to Wiring Repairs in Wiring Systems.

Is CKT 225 repair complete?

--

Go to Step 15

--

Check the Generator 4-way connector for a mis-wired condition in cavity D. This cavity should not be in this vehicle.

Has the mis-wired condition been repaired?

--

Go to Step 15

--

1. Disconnect or backprobe the CKT 225 connector at the PCM
2. Turn the ignition switch to RUN.
3. Use a J 39200 to inspect the voltage output of the PCM to CKT 225.

Is the voltage above the specified value?

12 V

Go to Step 11

Go to Step 12

Repair CKT 225 for a shorted, grounded, or open condition. Refer to Wiring Repairs in Wiring Systems.

Is the CKT 225 repair complete?

--

Go to Step 15

--

Repair or replace the PCM. Refer to PCM Replacement/Programming.

Is the repair complete?

--

Go to Step 15

--

Replace the generator. Refer to Generator Replacement or Auxiliary Generator Replacement .

Is the repair complete?

--

Go to Step 15

--

1. Disconnect the battery negative cable.
2. Disconnect and clean all connections between the battery positive terminal and the generator output terminal. Check all cables for an intermittent open condition. Refer to Starting and Charging Schematics .
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 15

--

1. Turn OFF all accessories. Connect the generator 4-way connector (if disconnected).
2. Start the engine and run at 2500 RPM.
3. Check the voltage across the battery terminals.

Is the voltage within the specified range?

13--16 V

System OK

Go to Step 5