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

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: The Flex Probe Kit must be used for all test connections. Use of standard multimeter probes may damage wiring terminals.

A1 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. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.

No : GO to A2.
A2 CHECK THE PUMP OPERATION
- Connect the scan tool.
- Key in ON position.
- Trigger the ABS module active command PMP MOTOR_ON.
- Does the ABS pump motor run for approximately 3 seconds?
Yes : TRIGGER the ABS module active command PMP MOTOR OFF.

CLEAR the DTC. CHECK the yellow ABS warning indicator while driving the vehicle above 12 km/h (7.5 mph). Do not apply the brakes until the vehicle exceeds 32 km/h (20 mph). If the yellow ABS warning indicator illuminates, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation. If the yellow ABS warning indicator does not illuminate, system is OK. If the yellow ABS warning indicator does illuminate, INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) .

No : TRIGGER the ABS module active command PMP MOTOR OFF. GO to A3.
A3 CHECK THE BATTERY JUNCTION BOX (BJB) FUSES 106 (40A) and 109 (20A)
- Check fuse: BJB Fuse 106 (40A).
- Check fuse: BJB Fuse 109 (20A).
- Are the fuses OK?
Yes : GO to A4.

No : INSTALL a new fuse(s). TEST the system for normal operation.

If fuse 106 (40A) fails again, REPAIR circuit 601 (LB/PK) for a short to ground. TEST the system for normal operation.

If fuse 109 (20A) fails again, REPAIR circuit 483 (RD) for a short to ground. TEST the system for normal operation.
A4 CHECK CIRCUITS 601 (LB/PK) AND 483 (RD) FOR AN OPEN
- Disconnect: ABS Module
- Measure the voltage between ground and:
  - ABS module C135-14, circuit 483 (RD), harness side.
  - ABS module C135-13, circuit 601 (LB/PK), harness side
    
    Fig 1: Checking Circuits 601 (LB/PK) And 483 (RD) For An Open
    Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
Yes : GO to A5.

No : REPAIR the affected circuit(s) for an open. CLEAR the DTCs. TEST the system for normal operation.
A5 CHECK THE ABS MODULE GROUNDS
- Measure the resistance between ground and:
  - ABS module C135-12, circuit 57 (BK), harness side.
  - ABS module C135-15, circuit 57 (BK), harness side.
    
    Fig 2: Checking The ABS Module Grounds
    Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes : GO to A6.

No : REPAIR the affected circuit(s) for an open. CLEAR the DTCs. TEST the system for normal operation.
A6 CHECK THE PUMP MOTOR FOR CORRECT OPERATION
- Disconnect: Pump Motor Connector.
- Connect a heavy gauge jumper between the negative battery post and the pump motor connector, brown wire; and momentarily connect a fused (30A) jumper between the positive battery post and the pump motor connector, red wire.
  
  Fig 3: Checking Pump Motor
  Courtesy of FORD MOTOR CO.
- Does the pump motor run?
Yes : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.

No : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . CLEAR the DTCs. TEST the system for normal operation.