Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test D: DTC C1300 - Abs Hydraulic Pump Motor Circuit Failure
2005 Ford Taurus SEL, 4D SedanSECTION Pinpoint Test D: DTC C1300 - Abs Hydraulic Pump Motor Circuit Failure
- D1 CHECK THE ABS PUMP MOTOR
- Key in ON position.
- Is the ABS pump motor running all the time?
- D2 CHECK THE PUMP MOTOR ACTIVE COMMAND
- Key in OFF position.
- Connect the diagnostic tool.
- Key in ON position.
- Trigger the ABS module pump motor ON active command.
- Does the ABS pump motor run for approximately three 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 D6. CLEAR the DTCs. TURN the ignition switch from OFF to ON. REPEAT the ABS self-test. If any DTCs are retrieved, REFER to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the SYMPTOM CHART 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 D3.
- D3 CHECK CIRCUIT 532 (OG/YE) FOR AN OPEN
- Disconnect: ABS Module C135.
- Measure the voltage between the ABS module C135 pin 13, circuit 532 (OG/YE), harness side and ground.
- Is the voltage greater than 10 volts?
- Yes : GO to D4.
- No : REPAIR the circuit. CLEAR the DTCs. TURN the ignition switch from OFF to ON. REPEAT the ABS self-test. If any DTCs are retrieved, REFER to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the SYMPTOM CHART . TEST the system for normal operation.
- D4 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Measure the resistance between the ABS module C135 pin 12, circuit 57 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
- Yes : GO to D5.
- No : REPAIR the circuit. CLEAR the DTCs. TURN the ignition switch from OFF to ON. REPEAT the ABS self-test. If any DTCs are retrieved, REFER to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the SYMPTOM CHART . TEST the system for normal operation.
- D5 CHECK FOR CORRECT PUMP MOTOR OPERATION
- Disconnect the pump motor connector.
- Connect a fused (40A) jumper wire between the battery positive terminal and one pin of the pump motor.
- Connect a second jumper wire between the other pin of the pump motor and ground.
- Does the pump motor operate?
- Yes : GO to D6.
- No : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . CLEAR the DTCs. TURN the ignition switch from OFF to ON. REPEAT the ABS self-test. If any DTCs are retrieved, ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the SYMPTOM CHART . TEST the system for normal operation.
- D6 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect all ABS connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all ABS connectors and make sure they seat 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 . TEST the system for normal operation.
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. TURN the ignition switch from OFF to ON. REPEAT the ABS self-test. If any DTCs are retrieved, REFER to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . If no DTCs are retrieved, CARRY OUT a drive test above 15 km/h (9 mph), then REFER to the SYMPTOM CHART .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.