Pinpoint Test E: DTC C1145, DTC C1155, DTC C1165, DTC C1175 - Wheel Speed Sensor Input Circuit Failure

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the flex probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

NOTE: Vehicles without traction control and stability assist have a single rear wheel speed sensor mounted to the rear differential. DTCs C1165 or C1175 sets if there is a rear wheel speed sensor input circuit failure; DTC C1165 can be disregarded.

E1 CHECK THE WHEEL SPEED CIRCUITS FOR A SHORT TO VOLTAGE

CAUTION: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor will result.

NOTE: Both circuits must be checked for each DTC.

Key in OFF position.
Disconnect: Anti-lock Brake System (ABS) Module C155.
Disconnect: Suspect Wheel Speed Sensor.
Key in ON position.

Measure the voltage between the ABS module connector, harness side and ground as follows:

ABS MODULE CONNECTOR AND CIRCUIT

DTC	ABS Module Connector-Pin	Circuit
C1145	C155-33	514 (YE/RD)
C1145	C155-34	516 (YE/BK)
C1155	C155-45	522 (TN/BK)
C1155	C155-46	521 (TN/OG)
C1165 (ABS with Stability Assist)	C155-42	524 (PK/BK)
C1165 (ABS with Stability Assist)	C155-43	523 (RD/PK)
C1175 (ABS with Stability Assist)	C155-36	518 (LG/RD)
C1175 (ABS with Stability Assist)	C155-37	519 (LG/BK)
C1175 (ABS only)	C155-36	518 (LG/RD)
C1175 (ABS only)	C155-37	519 (LG/BK)

Fig 1: Checking Wheel Speed Circuits For Short To Voltage

Courtesy of FORD MOTOR CO.

Is any voltage present?

Yes : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
No : GO to E2.

E2 CHECK THE WHEEL SPEED CIRCUITS FOR A SHORT TO GROUND

NOTE: Both circuits must be checked for each DTC.

Key in OFF position.

Measure the resistance between the ABS module connector, harness side and ground as follows:

ABS MODULE CONNECTOR AND CIRCUIT

DTC	ABS Module Connector-Pin	Circuit
C1145	C155-33	514 (YE/RD)
C1145	C155-34	516 (YE/BK)
C1155	C155-45	522 (TN/BK)
C1155	C155-46	521 (TN/OG)
C1165 (ABS with Stability Assist)	C155-42	524 (PK/BK)
C1165 (ABS with Stability Assist)	C155-43	523 (RD/PK)
C1175 (ABS with Stability Assist)	C155-36	518 (LG/RD)
C1175 (ABS with Stability Assist)	C155-37	519 (LG/BK)
C1175 (ABS only)	C155-36	518 (LG/RD)
C1175 (ABS only)	C155-37	519 (LG/BK)

Fig 2: Checking Wheel Speed Circuits For Short To Ground

Courtesy of FORD MOTOR CO.

Are the resistances greater than 10,000 ohms?

Yes : GO to E3.
No : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.

E3 CHECK THE WHEEL SPEED CIRCUITS FOR AN OPEN

NOTE: Both circuits must be checked for each DTC.

Measure the resistance between the ABS module connector, harness side and the suspect wheel speed sensor connector, harness side as follows:

ABS MODULE AND WHEEL SPEED SENSOR CONNECTOR AND CIRCUIT

DTC	Circuit	ABS Module Connector-Pin	Wheel Speed Sensor Connector-Pin
C1145	516 (YE/BK)	C155-34	RH front wheel speed sensor C160-2
C1145	514 (YE/RD)	C155-33	RH front wheel speed sensor C160-1
C1155	522 (TN/BK)	C155-45	LH front wheel speed sensor C150-2
C1155	521 (TN/OG)	C155-46	LH front wheel speed sensor C150-1
C1165 (ABS with Stability Assist)	523 (RD/PK)	C155-43	RH rear wheel speed sensor C426-2
C1165 (ABS with Stability Assist)	524 (PK/BK)	C155-42	RH rear wheel speed sensor C426-1
C1175 (ABS with Stability Assist)	518 (LG/RD)	C155-36	LH rear wheel speed sensor C440-2
C1175 (ABS with Stability Assist)	519 (LG/BK)	C155-37	LH rear wheel speed sensor C440-1
C1175 (ABS only)	518 (LG/RD)	C155-36	Rear wheel speed sensor C455-1
C1175 (ABS only)	519 (LG/BK)	C155-37	Rear wheel speed sensor C455-2

Fig 3: Checking Wheel Speed Circuits For Open

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes : GO to E4.
No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

E4 CHECK FOR SHORTED WHEEL SPEED SENSOR CIRCUITS
- Measure the resistance between the suspect wheel speed sensor pins, harness side.
  
  Fig 4: Measuring Resistance Between Suspect Wheel Speed Sensor Pins, Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to E5.
- No : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
E5 CHECK THE ABS MODULE OUTPUT
- Connect: ABS Module C155.
- Key in ON position.
- Measure the voltage between the suspect wheel speed sensor pins, harness side.
  
  Fig 5: Checking ABS Module Output
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : INSTALL a new wheel speed sensor. REFER to WHEEL SPEED SENSOR - FRONT , WHEEL SPEED SENSOR - REAR, 3 CHANNEL or WHEEL SPEED SENSOR - REAR, 4 CHANNEL . CLEAR the DTCs. REPEAT the self-test.
- No : GO to E6.
E6 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect all the ABS connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the 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. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.