PINPOINT TEST D: DTCs C1095 AND C1096 - ABS HYDRAULIC PUMP MOTOR CIRCUIT FAILURE/OPEN

D1 CHECK THE ANTI-LOCK BRAKE SYSTEM (ABS) PUMP MOTOR
- Key in ON position.
- Is the ABS pump motor running all the time?
Yes : INSTALL a new ABS module and hydraulic control unit (HCU) as necessary. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE and HYDRAULIC CONTROL UNIT (HCU) in this article. CLEAR the DTCs. REPEAT the ABS self-test.

No : GO to D2.
D2 CHECK 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 2 seconds?
Yes : CLEAR the DTCs. CHECK the yellow ABS warning indicator while driving the vehicle (brakes must not be applied) above 32 km/h (20 mph). If the yellow ABS warning indicator illuminates, RETRIEVE the DTCs. If DTC C1096 is retrieved, GO to D5.

If DTC C1095 is retrieved, INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) in this article. CLEAR the DTCs. REPEAT the self-test.

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 ABS module C155-31, circuit 534 (YE/LG), harness side and ground.
  
  Fig 1: Checking Circuit 534 (YE/LG) For Open
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to D4.

No : REPAIR circuit 534 (YE/LG) for an open. CLEAR the DTCs. REPEAT the self-test.
D4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between ABS module C155-45, circuit 1205 (BK), harness side and ground; and between ABS module C155-16, circuit 1205 (BK), harness side and ground.
  
  Fig 2: Checking Circuit 1205 (BK) For Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) in this article. CLEAR the DTCs. REPEAT the self-test.

No : REPAIR the affected circuit(s) for an open. CLEAR the DTCs. REPEAT the self-test.
D5 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect the ABS connector.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect the ABS connector and make sure it seats correctly.
- Clear the DTCs.
- 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 in this article. 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.