Code Description

Fused battery voltage for pump motor operation is supplied to the ABS module by Battery Junction Box (BJB) fuse 47 (40A) along circuit SBB47 (WH/RD). Ground is provided to the ABS module along circuit GD121 (BK/YE).

When the ignition key is turned to the ON position, the ABS module commands the Hydraulic Control Unit (HCU) pump on for 100 ms (±6 ms) and is then commanded off. After 6 ms, the ABS module will read the voltage that is being generated by the HCU  pump. 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, 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, DTC C1096 is set.

• DTC C1095 (ABS Hydraulic Pump Motor Circuit Failure) - If a short to voltage or ground is detected, if a locked up pump motor is detected or if there is an internal failure of the ABS module, DTC C1095 will be set.
• DTC C1096 (ABS Hydraulic Pump Motor Circuit Open) - If a short to voltage, a short to ground or an open is detected, if a locked up pump motor is detected or if there is an internal failure of the ABS module, DTC C1096 will be set.

  This pinpoint test is intended to diagnose the following: 

• Fuse
• Wiring, terminals or connectors
• Hydraulic pump motor
• ABS module