Normal Operation

The operating voltage required to supply the hydraulic pump motor is in a range between 10 and 16 volts. Fused battery voltage for the hydraulic pump is supplied to the ABS module from Battery Junction Box (BJB) fuse 9 (40A) along circuit SBB09 (RD). Ground for the hydraulic pump is provided through the ABS module along circuit GD122 (BK).

• DTC C1095 (ABS Hydraulic Pump Motor Circuit Failure) - If the ABS module detects an open circuit, a short to voltage or ground or a defective internal power transistor during normal operation or the ABS module self-test, DTC C1095 will be set. The ABS module will command the pump motor ON for 100 ms (±6 ms), then command the motor OFF and measure the voltage produced by the motor after 6 ms. If the voltage indicates that the motor is spinning at less than 500 RPM, there may be a locked motor. If this condition is detected 4 times, then DTC C1095 will be set. The pump motor is also 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 C1095 will be set.

This pinpoint test is intended to diagnose the following: 

• Fuse
• Wiring, terminals or connectors
• ABS module