C2100-BATTERY VOLTAGE LOW
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on.
- Set Condition:
If the Anti-Lock Brakes Module detects system voltage is below 7.5 volts.
| Possible Causes |
| ECM OR PCM DTCs PRESENT |
| VEHICLE BATTERY / CHARGING SYSTEM |
| ANTI-LOCK BRAKES MODULE |
Diagnostic Test
1. DTC'S IN THE PCMNOTE: This DTC must be active for the results of this test to be valid.
Turn the ignition on.
With the scan tool, read and record DTCs from the PCM.
With the scan tool, read and record Freeze Frame information.
With the scan tool, erase DTCs.
Start the engine.
With the scan tool, read and record DTCs.
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 ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
- Go To 2
2. CHARGING SYSTEM FAILURE
Start the engine.
Connect voltmeter to vehicle battery.
Is the vehicle battery voltage under 8.2 volts?
No
- Go To 3
Yes
- Repair the charging system per service information.
- Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
3. CHARGING POWER SUPPLY VOLTAGE
With a scan tool read Power Supply Voltage.
Is Power Supply Voltage under 8.2 volts?
No
- Perform the ABS Intermittent Condition diagnostic procedure in this Section.
- Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)
Yes
- Replace the Anti-Lock Brakes Module in accordance with the Service Information.
- Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).