C0120
DTC C0111-C0120
Circuit Description
The electronic brake control module (EBCM) supplies ground to activate the Antilock Brake System (ABS) pump motor. An internal system relay in the EBCM supplies battery positive voltage to the pump motor when the ignition is turned ON. The EBCM monitors pump motor feedback voltage after activation to detect a stalled or binding pump motor.
DTC Descriptors
This diagnostic procedure supports the following DTC's:
^ DTC C0111 Pump Motor Circuit Range/Performance
^ DTC C0113 Pump Motor Circuit High
^ DTC C0114 Pump Motor Circuit Open
^ DTC C0115 Pump Motor Performance
^ DTC C0120 Pump Motor Relay Circuit Open
Conditions for Running the DTC
C0111
^ The ignition voltage is greater than 8 volts.
^ The pump motor has been commanded OFF for longer than 1.4 seconds and then commanded ON.
^ Voltage to the pump motor is greater than 11 volts when the pump motor is commanded ON.
C0113
^ The ignition voltage is between 9.2 - 17 volts.
^ The system enable relay is ON.
C0114
^ The system voltage is between 10.1 - 17 volts.
^ The ignition voltage is between 9.2 - 17 volts.
^ The system enable relay is ON.
^ The pump motor has been commanded OFF for 1.4 seconds.
C0115
^ The system and ignition voltage is greater than 8 volts.
^ The system enable relay is ON.
^ The pump motor is commanded ON.
^ No other pump motor faults have been detected
C0120
^ The system and ignition voltage is greater than 8 volts.
^ The system enable relay is ON.
^ The pump motor is commanded ON.
Conditions for Setting the DTC
C0111
The EBCM excessive current draw from the pump motor.
C0113
The EBCM detects an open in the pump motor ground circuit.
C0114
This code sets for a possible open in the pump motor.
C0115
The EBCM monitors pump motor feedback voltage after activation
C0120
This code sets for a possible open in the internal EBCM pump motor relay circuit.
Action Taken When the DTC Sets
If equipped, the following actions occur:
^ The EBCM disables the ABS/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.
^ The dynamic rear proportion (DRP) is degraded.
^ The ABS indicator turns ON.
^ The stability OFF indicator turns ON.
^ The traction OFF indicator turns ON.
Conditions for Clearing the DTC
^ The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
^ The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
The pump motor is integral to the brake pressure modulator valve (BPMV). The pump motor is not serviceable.
Test Description
The number below refers to the step number on the diagnostic table.
5. Tests the ability of the EBCM to control the pump motor. If the test lamp illuminates, the pump motor circuit within the EBCM is good.
