Pinpoint Test B: DTC C1300 - Abs Hydraulic Pump Motor Circuit Failure

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. 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 PUMP MOTOR
- Key in ON position.
- Is the ABS pump motor running all the time?
1. YES : Go to B5.
2. NO : Go to B2.
B2 CHECK THE ABS MODULE PUMP MOTOR (PMP_MOTOR) OUTPUT COMMAND
- Connect the diagnostic tool.
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: DataLogger ABS Module
- Toggle the PMP_MOTOR output command ON.
- Does the ABS pump motor run for approximately 3 seconds?
1. YES : TOGGLE the PMP_MOTOR output command OFF.
  CLEAR the DTCs. CHECK the yellow ABS warning indicator while driving the vehicle (the brakes must not be applied) above 32 km/h (20 mph).
  
  If the yellow ABS warning indicator illuminates, RETRIEVE the DTCs. If DTC C1300 is retrieved again, go to B5.
  
  If the yellow ABS warning indicator does not illuminate, the system is OK.
2. NO : TOGGLE the PMP_MOTOR output command OFF. Go to B3.
B3 CHECK CIRCUIT 534 (YE/LG) FOR VOLTAGE
- Key in OFF position.
- Disconnect: ABS Module C135
- Key in ON position.
- Measure the voltage between ABS module C135-1, circuit 534 (YE/LG), harness side and ground.
  
  Fig 1: Checking Circuit 534 (YE/LG) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
1. YES : Go to B4.
2. NO : VERIFY CJB fuse 112 (40A) is OK. If OK, REPAIR circuit 534 (YE/LG). CLEAR the DTCs. REPEAT the self-test.
B4 CHECK CIRCUIT 57 (BK) FOR AN OPEN OR EXCESSIVE RESISTANCE
- Key in OFF position.
- Measure the resistance between ABS module C135-13, circuit 57 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
1. YES : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this article. CLEAR the DTCs. REPEAT the self-test.
2. NO : REPAIR circuit 57 (BK). CLEAR the DTCs. REPEAT the self-test.
B5 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: ABS Module C135
- Check the connector for:
  - corrosion.
  - pushed-out pins.
  - spread terminals.
- Connect: ABS Module C135
- Make sure the connector seats correctly, then 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 in this article. TEST the system for normal operation.
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. REPEAT the self-test.