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

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. 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 multi-meter probes.

B1 CHECK THE ABS HARNESS AND MODULE FOR WATER INTRUSION
- Key in OFF position.
- Disconnect: ABS Module C135
- Inspect the ABS module connector and module for water intrusion.
- Is there any evidence of water entry?
1. YES : CLEAN the connector and dry it with low pressure compressed air. INSPECT for evidence of water entry and REPAIR as necessary. CALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. TEST DRIVE the vehicle above 32 km/h (20 mph) and CARRY OUT at least one ABS stop.
2. NO : Go to B2.
B2 CHECK THE ABS PUMP MOTOR
- Connect: ABS C135
- Key in ON position.
- Is the ABS pump motor running all the time?
1. YES : INSTALL a new hydraulic control unit (HCU). REFER to Hydraulic Control Unit (HCU) . CALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
2. NO : Go to B3.
B3 CHECK PUMP MOTOR OPERATION
- Enter the following diagnostic mode on the diagnostic tool: ABS Module Active Command
- Trigger the ABS module pump motor ON active command.
- Does the ABS pump motor run for approximately 2 seconds?
1. 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 does not illuminate, the system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
  
  If the yellow ABS warning indicator illuminates, RETRIEVE the DTCs.
  
  If DTC C1096 is retrieved, go to B6.
  
  If DTC C1095 is retrieved, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . CALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
2. NO : Go to B4.
B4 CHECK CIRCUIT SBB15 (WH/RD) FOR AN OPEN
- Key in OFF position.
- Disconnect: ABS Module C135
- Measure the voltage between ABS module C135-1, circuit SBB15 (WH/RD), harness side and ground.
- Is the voltage greater than 10 volts?
1. YES : Go to B5.
2. NO : VERIFY battery junction box fuse (BJB) fuse 15 (40A) is OK. If OK, REPAIR circuit SBB15 (WH/RD). CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
B5 CHECK CIRCUIT GD121 (BK/YE) FOR AN OPEN
- Measure the resistance between ABS module C135-13, circuit GD121 (BK/YE), harness side and ground.
- Are the resistances less than 5 ohms?
1. YES : INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) . CLEAR the DTCs. CALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
2. NO : REPAIR circuit GD121 (BK/YE). CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
B6 CHECK THE ABS MODULE ELECTRICAL CONNECTOR
- Check the ABS module connector for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: ABS C135
- Make sure the ABS connector seats correctly.
- Clear the DTCs.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . CALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.