C1102

DTC C1102

Circuit Description

This circuit is used to monitor the voltage level available to the electronic brake control module (EBCM). If the voltage drops below a certain level, full performance of the system cannot be guaranteed. During ABS operation, there are several current requirements that will cause battery voltage to drop. Because of this, voltage is monitored prior to ABS operation to indicate a good charging system condition and also during ABS operation when voltage may drop significantly.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C1102 Battery Voltage Low

Conditions for Running the DTC

Vehicle speed is greater than 8 km/h (5 mph).

Conditions for Setting the DTC

Ignition voltage to terminal 4 and battery voltage to terminal 9 and 25 are less than 10.5 volts during non ABS or initialization. The DTC will also set if the ignition voltage is below 10.5 volts and the battery voltage is below 9 volts during ABS.

Action Taken When the DTC Sets

* The solenoid relay opens, removing voltage from the solenoids and pump motor.
* DTC C1102 is stored.
* ABS disabled, ABS warning lamp turns ON.


Conditions for Clearing the DTC

* If the conditions that set the DTC C1102 are no longer present, the DTC may be cleared by using the proper scan tool.
* The DTC that has not occurred in 100 drive cycles will be cleared from history data.


Diagnostic Aids

Typical causes for DTC C1102 to set:

* Weak or discharged battery
* Poor battery terminal contact
* Excessive battery draws from factory or after-market equipment parasitic load.
* Poor battery ground at block or chassis
* Poor terminal contact at the EBCM
* Poor EBCM ground connection
* Charging system malfunction generator

Thoroughly inspect the wiring and the connectors. Failure to inspect the wiring and the connectors carefully and fully can cause replacement of parts without repairing the malfunction.