Test B: DTCS C1095 and C1096 -ABS Hydraulic Pump Motor Circuit Failure/Open

Test B: DTCs C1095 and C1096 -ABS Hydraulic Pump Motor Circuit Failure/Open

Refer to Vehicle/Diagrams, Vehicle Dynamic Systems for schematic and connector information.

Normal Operation
Anti-lock brake system (ABS) diagnostic trouble code (DTC) C1095 sets only when the motor is initially commanded on for 100 ms (+/-6 ms) and the ABS hydraulic pump motor is then commanded off and the voltage back is read after 6 ms. If the voltage indicates the motor is spinning at less than 500 rpm, there may be a locked motor. If this condition is detected 4 times, then a locked motor DTC C1095 is set. The pump motor is checked for an open circuit 2 seconds after the most recent successful pump motor off command. If the pump motor feedback remains greater than 0.75 volt for more than 50 ms (+/-6 ms) after these conditions have been met, then DTC C1096 is set.
Fused battery voltage is supplied from the bussed electrical center (BEC) fuse 8 (40A) along circuit 534 (YE/LG). Ground is provided along circuit 1205 (BK).

Possible Causes
- Fuse
- Circuit open
- Hydraulic pump motor
- Anti-lock brake system (ABS) module

B1-B4:

B4-B5: