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 2005 Lincoln LS. 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.

E1 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

NOTE: Both circuits must be checked for each DTC.

Key in OFF position.
Disconnect: ABS Module C155.
Disconnect: Suspect Wheel Speed Sensor.
Key in ON position.

Measure the voltage between ABS module C155 pins, harness side and ground, as follows:

DTC C1145, DTC C1155, DTC C1165, DTC C1175 SPECIFICATIONS

DTC	ABS Module C155 Pin	Circuit
C1145 (RF)	33	8-CF38 (WH/RD)
C1145 (RF)	34	7-CF38 (YE/RD)
C1155 (LF)	45	7-CF32 (YE)
C1155 (LF)	46	8-CF32 (WH)
C1165 (RR)	42	8-CF40 (WH/GN)
C1165 (RR)	43	7-CF40 (YE/GN)
C1175 (LR)	36	7-CF34 (YE/BU)
C1175 (LR)	37	8-CF34 (WH/BU)

Is voltage present?

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

E2 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO GROUND

NOTE: Both circuits must be checked for each DTC.

Key in OFF position.

Measure the resistance between ABS module C155 pins harness side and ground, as follows:

DTC C1145, DTC C1155, DTC C1165, DTC C1175 SPECIFICATIONS

DTC	ABS Module C155 Pin	Circuit
C1145 (RF)	33	8-CF38 (WH/RD)
C1145 (RF)	34	7-CF38 (YE/RD)
C1155 (LF)	45	7-CF32 (YE)
C1155 (LF)	46	8-CF32 (WH)
C1165 (RR)	42	8-CF40 (WH/GN)
C1165 (RR)	43	7-CF40 (YE/GN)
C1175 (LR)	36	7-CF34 (YE/BU)
C1175 (LR)	37	8-CF34 (WH/BU)

Are the resistances greater than 10,000 ohms?

Yes : GO to E3.
No : REPAIR the circuit in question. CLEAR the DTC. REPEAT the self-test.

E3 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN

NOTE: Both circuits must be checked for each DTC.

Measure the resistance between ABS module C155 pins, harness side and the suspect wheel speed sensor connector pins, harness side as follows:

DTC C1145, DTC C1155, DTC C1165, DTC C1175 & WHEEL SPEED SENSOR CONNECTOR PIN SPECIFICATIONS

DTC	Circuit	ABS Module C155 Pin	Wheel Speed Sensor Connector Pin
C1145 (RF)	8-CF38 (WH/RD)	33	2
C1145 (RF)	7-CF38 (YE/RD)	34	1
C1155 (LF)	7-CF32 (YE)	45	1
C1155 (LF)	8-CF32 (WH)	46	2
C1165 (RR)	7-CF40 (YE/GN)	43	1
C1165 (RR)	8-CF40 (WH/GN)	42	2
C1175 (LR)	8-CF34 (WH/BU)	37	1
C1175 (LR)	7-CF34 (YE/BU)	36	2

Are the resistances less than 5 ohms?

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

E4 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT
- Measure the resistance between the suspect wheel speed sensor pins.
  
  Fig 1: Measuring Resistance Between Suspect Wheel Speed Sensor Pins
  Courtesy of FORD MOTOR CO.
- Is the resistance greater 10,000 ohms?
- Yes : GO to E5.
- No : REPAIR the circuit in question. CLEAR the DTC. 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 2: Measuring Voltage Between Suspected Wheel Speed Sensor Pins, Harness Side
  Courtesy of FORD MOTOR CO.
- Is the voltage less than 9 volts?
- Yes : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE in this article . CLEAR the DTC. REPEAT the self-test.
- No : INSTALL a new wheel speed sensor. For the front wheel speed sensor, REFER to WHEEL SPEED SENSOR - FRONT in this article . CLEAR the DTC. REPEAT the self-test. For the rear wheel speed sensor, REFER to WHEEL SPEED SENSOR - REAR in this article . CLEAR the DTC. REPEAT the self-test.