Antilock Brake Module (ABS)

C2100-BATTERY VOLTAGE LOW

For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

- When Monitored:
Vehicle speeds above 3.4 mph (6 km/h).

- Set Condition:
Voltage is less than 8.2 volts for longer than 20 mSec at vehicle speeds above 3.4 mph (6 km/h).





1. DTCs IN THE PCM

NOTE: This DTC must be active for the results of this test to be valid.

NOTE: Light will be on and not set a DTC when battery voltage is below 9.3 volts and no wheel speed.

1. Turn the ignition on.
2. With the scan tool, read and record DTCs from the PCM.
3. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
4. With the scan tool, erase DTCs.
5. Start the engine.
6. Road test the vehicle over 3.4 mph (6 km/h).

NOTE: Vehicle must be driven above 3.4 mph (6 km/h) for set conditions to be met.

7. With the scan tool, read and record ABS DTCs.
8. With the scan tool read DTCs from the PCM.

Are any charging system codes present in the PCM?

Yes

- Repair the charging system DTC in the PCM Testing and Inspection.

No

- Go To 2

2. CHARGING SYSTEM FAILURE
1. Start the engine.
2. Connect voltmeter to vehicle battery.

Is the vehicle battery voltage under 8.2 volts?

No

- Go To 3

Yes

- Repair the charging system.
- Perform the ABS VERIFICATION TEST ABS Verification Test.

3. CHARGING POWER SUPPLY VOLTAGE
1. With a scan tool read Power Supply Voltage.

Is Power Supply Voltage under 8.2 volts?

No

- Perform the ABS-INTERMITTENT CONDITION TEST ABS Intermittent Condition Test.

Yes

- Replace the Anti-Lock Brake Module.
- Perform the ABS VERIFICATION TEST ABS Verification Test.