Pinpoint Test C: DTC C1095 - Abs Hydraulic Pump Motor Circuit Failure: Overview

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. 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.

C1 CHECK THE ABS PUMP MOTOR
- Key in ON position.
- Is the ABS pump motor running all the time?
Yes: GO to C5.

No: GO to C2.
C2 CHECK THE PUMP MOTOR OPERATION
- Key in OFF position.
- Connect the scan tool.
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: ABS Module Active Command.
- Trigger the ABS module pump motor ON active command.
- Does the ABS pump motor run for approximately 3 seconds?
Yes: CLEAR the DTCs. CHECK the yellow ABS warning indicator while driving the vehicle (brakes must not be applied) at greater than 32 km/h (20 mph). If the yellow ABS warning indicator illuminates, RETRIEVE the DTCs. If DTC C1095 is retrieved, GO to C5.

No: TRIGGER the ABS module pump motor OFF active command. GO to C3.
C3 CHECK CIRCUIT 534 (YE/LG) FOR AN OPEN
- For vehicles equipped with a 3.0L engine , with the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
- Key in OFF position.
- Disconnect: ABS Module C155.
- Key in ON position.
- Measure the voltage between ABS module C155-1, circuit 534 (YE/LG), harness side and ground.
  
  Fig 1: Checking Circuit 534 (YE/LG) For An Open
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes: GO to C4.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
C4 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between ABS module C155-47, circuit 570 (BK/WH), harness side and ground.
  
  Fig 2: Checking Circuit 570 (BK/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: INSTALL a new 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.
C5 CHECK FOR CORRECT ABS MODULE OPERATION
- For vehicles equipped with a 3.0L engine , with the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
- Disconnect the ABS connector.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect the ABS connector and make sure it is seated 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.