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

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

G1 CHECK THE ABS PUMP MOTOR
- Key in ON position.
- Is the ABS pump motor running all the time?
Yes: GO to G5.

No: GO to G2.
G2 CHECK THE PUMP MOTOR ACTIVE COMMAND
- 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) above 15 km/h (9 mph). If the yellow ABS warning indicator illuminates, RETRIEVE the DTCs. If DTC C1300 is retrieved, GO to G5. If the yellow ABS warning indicator does not illuminate, the system is OK.

No: TRIGGER the ABS module pump motor OFF active command. GO to G3.
G3 CHECK CIRCUIT 534 (YE/LG) FOR AN OPEN
- 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: Measuring Voltage Between ABS Module C135-1, Circuit 534 (YE/LG), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes: GO to G4.

No: VERIFY battery junction box (BJB) fuse 9 (40A) is OK, If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
G4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Measure the resistance between ABS module C135-13, circuit 1205 (BK), harness side and ground.
  
  Fig 2: Measuring Resistance Between ABS Module C135-13, Circuit 1205 (BK), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to G5.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
G5 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: ABS Module C135.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect the ABS module connector and make sure it seats 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 . CLEAR the DTCs. REPEAT the self-test.

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.