Antilock Brake Module (ABS)

C2100-BATTERY VOLTAGE LOW

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

- When Monitored:
Continuous monitoring.

- Set Condition:
If the Anti-Lock Brake Module detects system voltage is below 9.3 volts.





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 Freeze Frame information.
4. With the scan tool, erase DTCs.
5. Start the engine.
6. Road test the vehicle over 6 km/h (3.4 mph).

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

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

Are any charging system codes present?

Yes

- Repair the charging system DTC in the PCM.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Go To 2

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

Is the vehicle battery voltage under 9.3 volts?

Yes

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

No

- Go To 3

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

Is Power Supply Voltage under 9.3 volts?

Yes

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

No

- Perform ABS-INTERMITTENT CONDITION TEST. Component Tests and General Diagnostics.