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

WARNING: This page is about a different car, the 2004 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When an anti-lock brake sensor is removed, thoroughly clean the mounting surfaces and apply High Temperature 4x4 Front Axle and Wheel Bearing Grease E8TZ-19590-A or equivalent meeting Ford specification ESA-M1C198-A.

Test Step

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

Key in OFF position.
Disconnect: Traction Control Module C135.
Disconnect: Suspect Wheel Speed Sensor.
Key in ON position.
Measure the voltage of the suspect wheel speed sensor circuit between:
- (RF) traction control module C135 pin 33, circuit 9-CF38 (BN/RD), harness side and ground; and between the traction control module C135 pin 34, circuit 8-CF38 (WH/RD), harness side and ground.
- (LF) traction control module C135 pin 45, circuit 8-CF32 (WH), harness side and ground; and between the traction control module C135 pin 46, circuit 9-CF32 (BN), harness side and ground.
- (RR) traction control module C135 pin 43, circuit 8-CF40 (WH/GN), harness side and ground; and between the traction control module C135 pin 42, circuit 9-CF40 (BN/GN), harness side and ground.
- (LR) traction control module C135 pin 36, circuit 8-CF34 (WH/BU), harness side and ground; and between the traction control 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?

Result / Action to Take

Yes

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

Go to E2.

Test Step

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) traction control module C135 pin 33, circuit 9-CF38 (BN/RD), harness side and ground; and between the traction control module C135 pin 34, circuit 8-CF38 (WH/RD), harness side and ground.
- (LF) traction control module C135 pin 45, circuit 8-CF32 (WH), harness side and ground; and between the traction control module C135 pin 46, circuit 9-CF32 (BN), harness side and ground.
- (RR) traction control module C135 pin 43, circuit 8-CF40 (WH/GN), harness side and ground; and between the traction control module C135 pin 42, circuit 9-CF40 (BN/GN), harness side and ground.
- (LR) traction control module C135 pin 36, circuit 8-CF34 (WH/BU), harness side and ground; and between the traction control 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.
Are the resistances greater than 10,000 ohms?

Result / Action to Take

Yes

Go to E3.

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

Test Step

E3 CHECK THE SUSPECT WHEEL SPEED SENSOR CIRCUIT FOR OPEN

Measure the resistance of the suspect wheel speed sensor circuit between:
- (RF) traction control 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 traction control 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) traction control 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 traction control 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) traction control 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 traction control 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) traction control module C135 pin 36, circuit 8-CF34 (WH/BU), harness side and the LR wheel speed sensor C440 pin 2, circuit 8-CF34 (WH/BU), harness side: and between the traction control 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 3: Checking Suspect Wheel Speed Sensor Circuit For Open
Courtesy of FORD MOTOR CO.
Is the resistance less than 5 ohms?

Result / Action to Take

Yes

Go to E4.

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

Test Step

E4 CHECK THE TRACTION CONTROL MODULE OUTPUT

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

Fig 4: Checking Traction Control Module Output
Courtesy of FORD MOTOR CO.
Is the voltage less than 9 volts?

Result / Action to Take

Yes

INSTALL a new HCU. REFER to ANTI-LOCK CONTROL . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

INSTALL a new wheel speed sensor. REFER to ANTI-LOCK CONTROL . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.