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Home >> Ford >> 2000 >> Focus LX, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnostic Tests >> Test K: DTC C1288 - Primary Brake Pressure Sensor Input Circuit Failure & DTC C1440 - Primary Brake Pressure Signal Faulted

Test K: DTC C1288 - Primary Brake Pressure Sensor Input Circuit Failure & DTC C1440 - Primary Brake Pressure Signal Faulted

  1. Turn ignition off. Disconnect TCS connector (C830). Disconnect primary brake pressure sensor connector (C821). Turn ignition on. Using DVOM, measure voltage between TCS connector terminal No. 10 (Yellow/Black wire) and ground. Measure voltage between TCS connector terminal No. 26 (White/Black wire) and ground. Measure voltage between TCS connector terminal No. 43 (Brown/Yellow wire) and ground. If voltage is present at any point, repair faulty circuit. If voltage is not present at any point, go to next step.
  2. Turn ignition off. Measure resistance between TCS connector terminal No. 10 (Yellow/Black wire) and ground. Measure resistance between TCS connector terminal No. 26 (White/Black wire) and ground. Measure resistance between TCS connector terminal No. 43 (Brown/Yellow wire) and ground. If resistance is greater than 10 k/ohms, go to next step. If voltage is less than 10 k/ohms, repair faulty circuit.
  3. Measure resistance between TCS connector terminal No. 43 (Brown/Yellow wire) and primary brake pressure sensor connector terminal No. 1 (Brown/Yellow wire). Measure resistance between TCS connector terminal No. 26 (White/Black wire) and primary brake pressure sensor connector terminal No. 2 (White/Black wire). Measure resistance between TCS connector terminal No. 10 (Yellow/Black wire) and primary brake pressure sensor connector terminal No. 3 (Yellow/Black wire). If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair faulty circuit.
  4. Reconnect TCS connector. Turn ignition on. Measure voltage between primary brake pressure sensor connector terminal No. 3 (Yellow/Black wire) and terminal No. 1 (Brown/Yellow wire). If voltage is approximately 5 volts, go to next step. If voltage is not approximately 5 volts, replace TCS module.
  5. Reconnect primary brake pressure sensor connector. Disconnect TCS connector. Back out TCS connector terminal No. 26 (White/Black wire). Reconnect TCS connector. Turn ignition on. Measure voltage between backed out TCS connector terminal No. 26 (White/Black wire) and ground, while depressing and releasing brake pedal. If voltage is 0.125-0.375 volt with brake pedal released; and 0.125-5.0 volts with brake pedal depressed, replace TCS module. If voltage is not 0.125-0.375 volt with brake pedal released; and not 0.125-5.0 volts with brake pedal depressed, replace primary brake pressure sensor. Using scan tool, clear DTCs. Recalibrate TCS module.
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