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). Ground for the hydraulic pump is provided through the ABS module.

• 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 sets. The ABS module commands 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 is 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 sets.

This pinpoint test is intended to diagnose the following: 

• Fuse
• Wiring, terminals or connectors
• Hydraulic Control Unit (HCU)
• ABS module