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

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 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 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 two seconds?
Yes

CLEAR the DTCs. CHECK the yellow ABS warning indicator while driving the vehicle (brakes must not be applied) above 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 C155-1, Circuit 534 (YE/LG)
  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 C155-47, Circuit 530 (LG/YE)
  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.
D5 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect all ABS connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all 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. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.