Pinpoint Test D: DTC C1095 - Anti-Lock Brake System (Abs) Hydraulic Pump Motor Circuit Failure

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the flex probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

D1 CHECK THE ABS PUMP MOTOR
- Key in ON position.
- Is the ABS pump motor running all the time?
- Yes : GO to D5.
- No : GO to D2.
D2 CHECK THE PUMP MOTOR OPERATION
- Key in OFF position.
- Connect the diagnostic tool.
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Active Command.
- Trigger the ABS module pump motor ON active command.
- Does the ABS pump motor run for approximately 2 seconds?
- Yes : CLEAR the DTCs. CHECK the yellow ABS warning indicator while driving the vehicle (brakes must not be applied) at greater than 20 km/h (12 mph). If the yellow ABS warning indicator illuminates, RETRIEVE the DTCs. If DTC C1095 is retrieved, GO to D5.
- No : TRIGGER the ABS module pump motor OFF active command. GO to D3.
D3 CHECK CIRCUIT 534 (YE/LG) FOR AN OPEN
- Disconnect: ABS Module C155.
- Measure the voltage between the ABS module C155-1, circuit 534 (YE/LG), harness side and ground.
  
  Fig 1: Measuring Voltage Between ABS Module And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to D4.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
D4 CHECK CIRCUIT 530 (LG/YE) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the ABS module C155-47, circuit 530 (LG/YE), harness side and ground.
  
  Fig 2: Measuring Resistance Between ABS Module And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : INSTALL a new hydraulic control unit (HCU). REFER to HYDRAULIC CONTROL UNIT (HCU) . CLEAR the DTCs. REPEAT the self-test.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
D5 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect all the ABS connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the ABS connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.