C2100

C2100-BATTERY VOLTAGE LOW





For a complete wiring diagram Refer to Diagram/Electrical. Electrical Diagrams


- When Monitored:

Vehicle speeds above 6 km/h (3.4 mph).

- Set Condition:

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







Diagnostic Test


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.

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.

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.

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. ABS Verification Test

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.
- Perform ABS VERIFICATION TEST. ABS Verification Test


3. CHARGING POWER SUPPLY VOLTAGE


With a scan tool read Power Supply Voltage.

Is Power Supply Voltage under 8.2 volts?

No

- Refer to the INTERMITTENT CONDITION diagnostic procedure. ABS Intermittent Condition Test
- Perform ABS VERIFICATION TEST. ABS Verification Test

Yes

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