DEFINITION: A charging system fault has been detected by the Powertrain Control Module (PCM). The PCM monitors CKT 225 at connector C2 terminal 77. If the incorrect voltage reading is detected at connector C2 terminal 77, the PCM will send a Class 2 message to the IPC indicating a charging system fault. The CHARGE SYSTEM FAULT warning message will then illuminate across the Driver's Information Center. The voltmeter indicator may or may not indicate abnormal voltage readings. If PCM fault codes P0562 or P0563 exist, diagnose those first before proceeding with this table. Always ensure that a good battery is installed in the vehicle, charging system operation depends heavily on the battery condition.

Were you sent here from the Charging System Check?

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Go to Step 2

Go to Charging System Check

Load test the battery.

Does the battery pass the load test?

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Go to Step 5

Go to Step 3

1. Recharge the battery.
2. After charging, load test the battery again.

Does the battery pass the load test?

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Go to Step 5

Go to Step 4

Replace the battery.

Is the repair complete?

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Go to Charging System Check

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1. Start the engine and allow it to idle in Park.
2. Load the electrical system by turning on the headlights and the high blower.
3. Connect a DMM between the battery terminals.
4. Measure the available voltage at the battery with the engine running and the electrical system under load.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 6

Go to Step 11

1. Turn the ignition switch to the OFF position.
2. Disconnect the powertrain control module connector C2.
3. Return the ignition switch to the ON position.
4. Connect a DMM between ground and:

•	the powertrain control module connector C2 terminal 61.

•	the powertrain control module connector C2 terminal 20.

•	the powertrain control module connector C2 terminal 19.

5. Measure the available voltage at these powertrain control module terminals.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 7

Go to Step 8

Replace the Powertrain Control Module (PCM).

Is the repair complete?

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Go to Charging System Check

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Check the following fuses for an open cirucit.

Is either of these fuses open?

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Go to Step 9

Go to Step 10

Repair a short to ground in the circuit relative to the open fuse.

Is the repair complete?

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Go to Charging System Check

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Repair the open in the circuit relative to the PCM terminal lacking voltage.

Is the repair complete?

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Go to Charging System Check

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1. Connect a DMM between the BATTERY terminal (CKT 2-large red wire) in the back of the generator and ground.
2. Measure the available voltage at the BATTERY terminal (CKT 2-large red wire) in the back of the generator.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 15

Go to Step 12

Check the fusible link located down at the starter motor between the medium gauge blue wire (CKT 2) and the heavy gauge red wire (CKT 2). See wiring schematic for further detail.

Is the fusible link open?

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Go to Step 13

Go to Step 14

Repair a short to ground in CKT 2 (13 red wire) between the generator BATTERY terminal and the fusible link.

Is the repair complete?

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Go to Charging System Check

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Repair an open in CKT 1 (19 red wire), CKT 2 (3 blue wire) or CKT 2 (13 red wire) between the generator BATTERY terminal and the positive battery terminal. See wiring schematic for further detail.

Is the repair complete?

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Go to Charging System Check

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1. Disconnect the generator connector.
2. Connect a DMM between the generator connector terminal D (CKT 2-medium red wire) and ground.
3. Measure the available voltage at the generator connector terminal D (CKT 2-medium red wire).

Is the voltage within the specified values?

10.0-14.0V

Go to Step 19

Go to Step 16

Check the fusible link located down at the starter motor between the small gauge grey wire (CKT 2) and the medium gauge red wire (CKT 2). See wiring schematic for further detail.

Is the fusible link open?

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Go to Step 17

Go to Step 18

Repair a short to ground in CKT 2 (1 red wire) between the generator connector terminal D and the fusible link.

Is the repair complete?

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Go to Charging System Check

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Repair an open in CKT 1 (19 red wire), CKT 2 (0.5 grey wire) or CKT 2 (1 red wire) between the generator connector terminal D and the positive battery terminal. See wiring schematic for further detail.

Is the repair complete?

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Go to Charging System Check

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1. Disconnect the powertrain control module connector C2.
2. Connect a DMM between the generator connector terminal C (CKT 23) and the powertrain control module connector C2 terminal 11.
3. Measure CKT 23 for continuity between these two connectors.

Is CKT 23 continuous between the generator connector and the powertrain control module connector C2?

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Go to Step 20

Go to Step 22

1. Powertrain control module connector C2 and generator connector are still disconnected.
2. Connect the DMM between the generator connector terminal C (CKT 23) and ground.
3. Measure CKT 23 for continuity to ground.

Is CKT 23 shorted to ground?

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Go to Step 23

Go to Step 21

1. Powertrain control module connector C2 and generator connector are still disconnected.
2. DMM still connected between the generator connector terminal C (CKT 23) and ground.
3. Turn the ignition switch to the ON position.
4. Measure CKT 23 for available voltage.

Is CKT 23 shorted to battery power?

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Go to Step 24

Go to Step 25

Repair the open in CKT 23 between the generator connector and the powertrain control module connector C2.

Is the repair complete?

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Go to Charging System Check

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Repair the short to ground in CKT 23 between the generator connector and the powertrain control module connector C2.

Is the repair complete?

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Go to Charging System Check

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Repair the short to battery power in CKT 23 between the generator connector and the powertrain control module connector C2.

Is the repair complete?

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Go to Charging System Check

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1. Connect a DMM between the generator connector terminal B (CKT 225) and the powertrain control module connector C2 terminal 77.
2. Measure CKT 225 for continuity between these two connectors.

Is CKT 225 continuous between the generator connector and the powertrain control module connector C2?

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Go to Step 26

Go to Step 28

1. Powertrain control module connector C2 and generator connector are still disconnected.
2. Connect the DMM between the generator connector terminal B (CKT 225) and ground.
3. Measure CKT 225 for continuity to ground.

Is CKT 225 shorted to ground?

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Go to Step 29

Go to Step 27

1. Powertrain control module connector C2 and generator connector are still disconnected.
2. DMM still connected between the generator connector terminal B (CKT 225) and ground.
3. Turn the ignition switch to the ON position.
4. Measure CKT 225 for available voltage.

Is CKT 225 shorted to battery power?

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Go to Step 30

Go to Step 31

Repair the open in CKT 225 between the generator connector and the powertrain control module connector C2.

Is the repair complete?

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Go to Charging System Check

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Repair the short to ground in CKT 225 between the generator connector and the powertrain control module connector C2.

Is the repair complete?

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Go to Charging System Check

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Repair the short to battery power in CKT 225 between the generator connector and the powertrain control module connector C2.

Is the repair complete?

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Go to Charging System Check

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Replace the generator.

Is the repair complete?

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Go to Charging System Check

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