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.

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HOMESERVICE MANUALSFORD2004FOCUS ZX5, 2.3 Z, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTI-LOCK BRAKE CONTROL SYSTEMDIAGNOSIS AND TESTINGANTI-LOCK CONTROLPINPOINT TESTSPINPOINT TEST E: DTC C1145 (RF), C1155 (LF), C1165 (RR), C1175 (LR) - WHEEL SPEED SENSOR INPUT CIRCUIT FAILURE

2004 Ford Focus ZX5, 2.3 Z, Standard

Pinpoint Test E: DTC C1145 (RF), C1155 (LF), C1165 (RR), C1175 (LR) - Wheel Speed Sensor Input Circuit Failure

2004 Ford Focus ZX5, 2.3 Z, StandardSECTION Pinpoint Test E: DTC C1145 (RF), C1155 (LF), C1165 (RR), C1175 (LR) - Wheel Speed Sensor Input Circuit Failure

E1 CHECK THE SUSPECT WHEEL SPEED CIRCUIT FOR A SHORT TO POWER

Key in OFF position.
Disconnect: ABS Module C135.
Disconnect: Suspect Wheel Speed Sensor.
Key in ON position.
Measure the voltage of the suspect wheel speed sensor circuit between:
- (RF) ABS module C135 pin 33, circuit 9-CF38 (BN/RD), harness side and ground; and between the ABS module C135 pin 34, circuit 8-CF38 (WH/RD), harness side and ground.
- (LF) ABS module C135 pin 45, circuit 8-CF32 (WH), harness side and ground; and between the ABS module C135 pin 46, circuit 9-CF32 (BN), harness side and ground.
- (RR) ABS module C135 pin 43, circuit 8-CF40 (WH/GN), harness side and ground; and between the ABS module C135 pin 42, circuit 9-CF40 (BN/GN), harness side and ground.
- (LR) ABS module C135 pin 36, circuit 8-CF34 (WH/BU), harness side and ground; and between the ABS module C135 pin 37, circuit 9-CF34 (BN/BU), harness side and ground.
Fig 1: Checking Suspect Wheel Speed Circuit For Short To Power
Courtesy of FORD MOTOR CO.
Is any voltage present?

Yes

REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Go to E2.

E2 CHECK THE SUSPECT WHEEL SPEED SENSOR CIRCUIT FOR A SHORT TO GROUND

Key in OFF position.
Measure the resistance of the suspect wheel speed sensor circuit between:
- (RF) ABS module C135 pin 33, circuit 9-CF38 (BN/RD), harness side and ground; and between the ABS module C135 pin 34, circuit 8-CF38 (WH/RD), harness side and ground.
- (LF) ABS module C135 pin 45, circuit 8-CF32 (WH), harness side and ground; and between the ABS module C135 pin 46, circuit 9-CF32 (BN), harness side and ground.
- (RR) ABS module C135 pin 43, circuit 8-CF40 (WH/GN), harness side and ground; and between the ABS module C135 pin 42, circuit 9-CF40 (BN/GN), harness side and ground.
- (LR) ABS module C135 pin 36, circuit 8-CF34 (WH/BU), harness side and ground; and between the ABS module C135 pin 37, circuit 9-CF34 (BN/BU), harness side and ground.
Fig 2: Checking Suspect Wheel Speed Sensor Circuit For Short To Ground
Courtesy of FORD MOTOR CO.
Is the resistance greater than 10,000 ohms?

Yes

Go to E3.

REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E3 CHECK THE SUSPECT WHEEL SPEED SENSOR CIRCUIT(S) FOR A SHORT

Measure the resistance of the suspect wheel speed sensor circuit and between:
- (RF) ABS module C135 pin 33 circuit 9-CF38 (BN/RD), harness side and the ABS module C135 pin 34 circuit 8-CF38 (WH/RD), harness side.
- (LF) ABS module C135 pin 45 circuit 8-CF32 (WH), harness side and the ABS module C135 pin 46 circuit 9-CF32 (BN), harness side.
- (RR) ABS module C135 pin 42 circuit 9-CF40 (BN/GN), harness side and the ABS module C135 pin 43 circuit 8-CF40 (WH/GN), harness side.
- (LR) ABS module C135 pin 36 circuit 8-CF34 (WH/BU), harness side and the ABS module C135 pin 37 circuit 9-CF34 (BN/BU), harness side
Fig 3: Checking Suspect Wheel Speed Sensor Circuit(s) For Short
Courtesy of FORD MOTOR CO.
Is the resistance greater than 10,000 ohms?

Yes

Go to E4.

REPAIR the circuit(s) in question.

E4 CHECK THE SUSPECT WHEEL SPEED SENSOR CIRCUIT FOR OPEN

Measure the resistance of the suspect wheel speed sensor circuit between:
- (RF) ABS module C135 pin 33, circuit 9-CF38 (BN/RD), harness side and the RF wheel speed sensor C160 pin 1, circuit 9-CF38 (BN/RD), harness side: and between the ABS module C135 pin 34, circuit 8-CF38 (WH/RD), harness side and the RF wheel speed sensor C160 pin 2, circuit 8-CF38 (WH/RD), harness side.
- (LF) ABS module C135 pin 45, circuit 8-CF32 (WH), harness side and the LF wheel speed sensor C150 pin 2, circuit 8-CF32 (WH), harness side: and between the ABS module C135 pin 46, circuit 9-CF32 (BN), harness side and the LF wheel speed sensor C150 pin 1, circuit 9-CF32 (BN), harness side.
- (RR) ABS module C135 pin 43, circuit 8-CF40 (WH/GN), harness side and the RR wheel speed sensor C426 pin 2, circuit 8-CF40 (WH/GN), harness side: and between the ABS module C135 pin 42, circuit 9-CF40 (BN/GN), harness side and the RR wheel speed sensor C426 pin 1, circuit 9-CF40 (BN/GN), harness side.
- (LR) ABS module C135 pin 36, circuit 8-CF34 (WH/BU), harness side and the LR wheel speed sensor C440 pin 2, circuit 9-CF34 (WH/BU), harness side: and between the ABS module C135 pin 37, circuit 9-CF34 (BN/BU), harness side and the LR wheel speed sensor C440 pin 1, circuit 9-CF34 (BN/BU), harness side.
Fig 4: Checking Suspect Wheel Speed Sensor Circuit For Open
Courtesy of FORD MOTOR CO.
Is the resistance less than 5 ohms?

Yes

Go to E5.

REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

E5 CHECK THE ABS MODULE OUTPUT

Connect: ABS Module C135.
Key in ON position.
Measure the voltage between the suspect wheel speed sensor pins, harness side.

Fig 5: Measuring Voltage Between Suspect Wheel Speed Sensor Pins, Harness Side
Courtesy of FORD MOTOR CO.
Is the voltage greater than 9 volts?

Yes

INSTALL a new ABS module. REFER to HYDRAULIC CONTROL UNIT (HCU) . REPEAT the self-test. TEST the system for normal operation.

INSTALL a new wheel speed sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

RENDER: 1.0x

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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.