Pinpoint Test D: DTCS C1145(RF), C1155(LF), C1175(Rear): Testing

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. 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.

D1 CHECK FOR FAULT REPEATABILITY
NOTE: Both circuits must be checked for each DTC.
- Connect the scan tool.
- Enter the following diagnostic mode on the scan tool: Clear the Continuous DTCs.
- Drive the vehicle with at least 16 km/h (10 mph).
- Retrieve and document continuous DTCs.
- Is DTC C1145, C1155, or C1175 retrieved?
- Yes : GO to D2.
- No : If any other DTCs are retrieved, GO to the ANTI-LOCK BRAKE SYSTEM ABS MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .

D2 CHECK FOR A SHORT TO VOLTAGE

NOTE: Both circuits must be checked for each DTC.

Key in OFF position.
Disconnect: ABS Module C135.
Disconnect: Suspect Wheel Speed Sensor.
Key in ON position.

Measure the voltage between the ABS module C135, harness side and ground, as follows:

CONNECTOR & CIRCUIT IDENTIFICATION

DTC	ABS Module C135 Pin	Circuit
C1145(RF)	26	514 (YE/RD)
C1145(RF)	27	516 (YE/BK)
C1155(LF)	12	521 (TN/OG)
C1155(LF)	13	522 (TN/BK)
C1175(rear)	42	523 (RD/PK)
C1175(rear)	41	519 (LG/BK)

Is any voltage present?

Yes : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
No : GO to D3.

D3 CHECK 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 C135, harness side, and ground, as follows:

CONNECTOR & CIRCUIT IDENTIFICATION

DTC	ABS Module C135 Pin	Circuit
C1145(RF)	26	514 (YE/RD)
C1145(RF)	27	516 (YE/BK)
C1155(LF)	12	521 (TN/OG)
C1155(LF)	13	522 (TN/BK)
C1175(rear)	42	523 (RD/PK)
C1175(rear)	41	519 (LG/BK)

Are the resistances greater than 10,000 ohms?

Yes : GO to D4.
No : REPAIR the circuit in question. CLEAR the DTCs. TEST the system for normal operation.

D4 CHECK FOR AN OPEN

NOTE: Both circuits must be checked for each DTC.

Measure the resistance between the ABS module C135, harness side and the suspected wheel speed sensor connector, harness side, as follows:

CONNECTOR & CIRCUIT IDENTIFICATION

DTC	Circuit	ABS Module C135 Pin	Wheel Speed Sensor Connector Pin
C1145(RF)	514 (YE/RD)	26	Circuit 160 pin 1
C1145(RF)	516 (YE/BK)	27	Circuit 160 pin 2
C1155(LF)	521 (TN/OG)	12	Circuit 150 pin 1
C1155(LF)	522 (TN/BK)	13	Circuit 150 pin 2
C1175(rear)	523 (RD/PK)	42	Circuit 455 pin 1
C1175(rear)	519 (LG/BK)	41	Circuit 455 pin 2

Are the resistances less than 5 ohms?

Yes : GO to D5.
No : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.

D5 CHECK FOR SHORTED WHEEL SPEED SENSOR CIRCUITS
- Measure the resistance between the suspect front wheel speed sensor pins, harness side with the meter in the 10 megaohm range.
  
  Fig 1: Measuring Resistance Between Suspect Front Wheel Speed Sensor Pins
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the rear wheel speed sensor pins, harness side with the meter in the 10 megaohm range.
  
  Fig 2: Measuring Resistance Between Rear Wheel Speed Sensor Pins
  Courtesy of FORD MOTOR CO.
- Is there any continuity?
- Yes : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
- No : GO to D6.
D6 CHECK THE ABS MODULE OUTPUT
- Connect: ABS Module C135.
- Key in ON position.
- Measure the voltage between the suspect front wheel speed sensor pins, harness side.
  
  Fig 3: Measuring Voltage Between Suspect Front Wheel Speed Sensor Pins
  Courtesy of FORD MOTOR CO.
- Measure the voltage between the rear wheel speed sensor pins, harness side.
  
  Fig 4: Measuring Voltage Between Rear Wheel Speed Sensor Pins
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
- Yes : INSTALL a new wheel speed sensor. For the front wheel speed sensor, REFER to WHEEL SPEED SENSOR - FRONT, 4X2 or WHEEL SPEED SENSOR - FRONT, 4X4 . CLEAR the DTCs. REPEAT the self-test. For the rear wheel speed sensor, REFER to WHEEL SPEED SENSOR - REAR . CLEAR the DTCs. TEST the system for normal operation.
- No : GO to D7.
D7 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect the ABS connector.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect the ABS connector and make sure that it is seated 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 . CLEAR the DTCs. REPEAT the self-test.
- 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.