C2100–BATTERY VOLTAGE LOW (FDCM)

For a complete wiring diagram Refer to Section 8W

When Monitored:
Continuously.
Set Condition:
The Final Drive Control Module detects that system voltage is below 8.5 volts for 10 seconds with engine RPM greater than 1500.

Possible Causes

CHARGING SYSTEM DTCS PRESENT

FINAL DRIVE CONTROL MODULE POWER CIRCUITS OPEN OR HIGH RESISTANCE

FINAL DRIVE CONTROL MODULE (FDCM)

1.CHARGING SYSTEM DTCS PRESENT

Are there any Charging System or related voltage DTCs present?

Yes

Refer to the symptom list and perform any Charging System DTC diagnostic procedures before continuing with this test.

2.DTC IS ACTIVE

Is the status Active for this DTC?

Yes

3.FINAL DRIVE CONTROL MODULE POWER CIRCUITS OPEN OR HIGH RESISTANCE

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly for each of the Fused B+ circuits?

Yes

Replace the Final Drive Control Module in accordance with the Service information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).

Repair the Fused B+ circuit(s) for an open circuit or high resistance.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).

4.FINAL DRIVE CONTROL MODULE

View repair.

Repair

Replace the Final Drive Control Module in accordance with the Service information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).

5.INTERMITTENT WIRING AND CONNECTORS

Were any problems found?

Yes