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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 112 (Anti-Lock Brake System - Vehicle Dynamic Systems) >> Diagnostic Tests >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test B: DTC C1145 (RF), C1155 (LF), C1165 (RR), C1175 (LR) - Wheel Speed Sensor Input Circuit Failure

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

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Vehicle Dynamic Systems for schematic and connector information.

Normal Operation 

The wheel speed sensor generates a square wave signal that is sent to the ABS module. The wheel speed sensor circuitry connects to the ABS module connector C135 through 2 wires and a connector at each wheel speed sensor. When the ignition is turned to the RUN position, the ABS module carries out a self-test by sending a reference voltage through the wheel speed sensors and their circuitry to determine if they are functional. Power and ground are supplied to the wheel speed sensors from the ABS module.

The front wheel speed sensors are integral to the wheel hub and bearing assembly and have a serviceable jumper harness connecting the sensor to the main wire harness.

DTC Description Fault Trigger Conditions
  • DTC C1145 - Wheel Speed Sensor RF Input Circuit Failure
  • DTC C1155 - Wheel Speed Sensor LF Input Circuit Failure
  • DTC C1165 - Wheel Speed Sensor RR Input Circuit Failure
  • DTC C1175 - Wheel Speed Sensor LR Input Circuit Failure
 		 When the vehicle speed exceeds 5 km/h (3 mph) or when the ABS module self-test is carried out, if the ABS module detects a short to ground, a short to voltage, an open circuit or a defective wheel speed sensor, the corresponding DTC will be set.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST B: DTC C1145 (RF), DTC C1155 (LF), DTC C1165 (RR), DTC C1175 (LR) - WHEEL SPEED SENSOR INPUT CIRCUIT FAILURE 

NOTE: The Flex Probe Kit must be used for all test connections. Use of standard multi-meter probes may damage wiring terminals.
  1. B1 CHECK THE SUSPECT WHEEL SPEED SENSOR FOR AN OPEN 
    NOTE: To access the LH front wheel speed sensor electrical connector, remove the air cleaner assembly. To access the rear wheel speed sensors, remove the rear seat cushion.
    • Disconnect: Suspect Wheel Speed Sensor
      • Fig 1: Checking Wheel Speed Sensor For Open
      GF0014024Courtesy of FORD MOTOR CO.
    • Measure the resistance between the suspect wheel speed sensor terminals, component side.
    • Is the resistance between 1,000 and 2,000 ohms for the front wheel speed sensors, and between 1,300 and 1,900 ohms for the rear wheel speed sensors? 
    1. YES  : CONNECT the wheel speed sensor. Go to  B2.
    2. NO  : For front wheel speed sensors, thoroughly INSPECT the front wheel speed sensor jumper harness. If the jumper harness is not OK, INSTALL a new jumper harness. If the jumper harness is OK, INSTALL a new front wheel speed sensor, refer to Wheel Speed Sensor - Front . For rear wheel speed sensors, INSTALL a new rear wheel speed sensor, REFER to Wheel Speed Sensor - Rear . CLEAR the DTCs. TEST the system for normal operation.
  2. B2 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO VOLTAGE 
    NOTE: To access the ABS module connector, remove the air cleaner assembly.
    • Key in OFF position.
    • Disconnect: ABS Module C135
    • Key in ON position.
    • Measure the voltage between ABS module C135 pins and ground as follows:
      • For DTC C1145  , ABS module C135-4, circuit 514 (YE/RD), harness side and ground. ABS module C135-5, circuit 516 (YE/BK), harness side and ground.
      • For DTC C1155  , ABS module C135-20, circuit 521 (TN/OG), harness side and ground. ABS module C135-21, circuit 522 (TN/BK), harness side and ground.
      • For DTC C1165  , ABS module C135-1, circuit 523 (RD/PK), harness side and ground. ABS module C135-3, circuit 524 (PK/BK), harness side and ground.
      • For DTC C1175  , ABS module C135-22, circuit 518 (LG/RD), harness side and ground. ABS module C135-23, circuit 519 (LG/BK), harness side and ground.
    • Is voltage present? 
    1. YES  : REPAIR the affected circuit(s). CLEAR the DTCs. TEST the system for normal operation.
    2. NO  : Go to  B3.
  3. B3 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between the ABS module C135 pins and ground as follows:
      • For DTC C1145  , ABS module C135-4, circuit 514 (YE/RD), harness side and ground. ABS module C135-5, circuit 516 (YE/BK), harness side and ground.
      • For DTC C1155  , ABS module C135-20, circuit 521 (TN/OG), harness side and ground. ABS module C135-21, circuit 522 (TN/BK), harness side and ground.
      • For DTC C1165  , ABS module C135-1, circuit 523 (RD/PK), harness side and ground. ABS module C135-3, circuit 524 (PK/BK), harness side and ground.
      • For DTC C1175  , ABS module C135-22, circuit 518 (LG/RD), harness side and ground. ABS module C135-23, circuit 519 (LG/BK), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  B4.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. TEST the system for normal operation.
  4. B4 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN 
    • Measure the resistance between the ABS module C135 pins and the corresponding wheel speed sensor pins as follows:
      • For DTC C1145  , ABS module C135-4, circuit 514 (YE/RD), harness side and RF wheel speed sensor C160-1, circuit 514 (YE/RD), harness side. ABS module C135-5, circuit 516 (YE/BK), harness side and RF wheel speed sensor C160-2, 516 (YE/BK), harness side.
      • For DTC C1155  , ABS module C135-20, circuit 521 (TN/OG), harness side and LF wheel speed sensor C150-1, circuit 521 (TN/OG), harness side. ABS module C135-21, circuit 522 (TN/BK), harness side and LF wheel speed sensor C150-2, circuit 522 (TN/BK), harness side.
      • For DTC C1165  , ABS module C135-1, circuit 523 (RD/PK), harness side and RR wheel speed sensor C426-1, circuit 523 (RD/PK), harness side. ABS module C135-3, circuit 524 (PK/BK), harness side and RR wheel speed sensor C426-2, circuit 524 (PK/BK), harness side.
      • For DTC C1175  , ABS module C135-22, circuit 518 (LG/RD), harness side and LR wheel speed sensor C440-1, circuit 518 (LG/RD), harness side. ABS module C135-23, circuit 519 (LG/BK), harness side and LR wheel speed sensor C440-2, circuit 518 (LG/RD), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. TEST the system for normal operation.
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