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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 C: DTC C1296 (LF), C1297 (RF), C1298 (RR), C1299 (LR) - Wheel Speed Sensor Input Signal Missing

Pinpoint Test C: DTC C1296 (LF), C1297 (RF), C1298 (RR), C1299 (LR) - Wheel Speed Sensor Input Signal Missing

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 C1296 - Wheel Speed LF Input Signal Missing
  • DTC C1297 - Wheel Speed RF Input Signal Missing
  • DTC C1298 - Wheel Speed RR Input Signal Missing
  • DTC C1299 - Wheel Speed LR Input Signal Missing
 		 When the vehicle speed exceeds 5 km/h (9 mph), if the signal from the wheel speed sensor is intermittent, shorted to ground or missing, the corresponding DTC will be set.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST C: DTC C1296 (LF), DTC C1297 (RF), DTC C1298 (RR), DTC C1299 (LR) - WHEEL SPEED SENSOR INPUT SIGNAL MISSING 

NOTE: The Flex Probe Kit must be used for all test connections. Use of standard multi-meter probes may damage wiring terminals.
  1. C1 CHECK THE WHEEL SPEED SENSOR 
      WARNING: Before servicing a vehicle equipped with a fire suppression system, depower the system by following the procedure in FIRE SUPPRESSION SYSTEM article. Failure to follow the instructions may result in serious personal injury.
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING article.
    • Check the suspect wheel speed sensor for correct mounting, excessive dirt build up, metal obstructions, incorrect harness routing and chafing.
    • Is the suspect wheel speed sensor OK? 
    1. YES  : Go to  C2.
    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. If equipped with fire suppression system, go to  C6.
  2. C2 CHECK THE WHEEL SPEED SENSOR TONE RING 
    • Check the suspect wheel speed sensor tone ring for corrosion, nicks, damaged teeth, correct mounting, alignment and consistent air gap.
    • Is the suspect wheel speed sensor tone ring OK? 
    1. YES  : Go to  C3.
    2. NO  : REPAIR or INSTALL a new wheel speed sensor ring. REFER to FRONT SUSPENSION article for front or REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR article for rear. CLEAR the DTCs. TEST the system for normal operation. If equipped with fire suppression system, go to  C6.
  3. C3 CHECK THE WHEEL SPEED SENSOR OUTPUT 
    NOTE: To access the ABS module connector, remove the air cleaner assembly.
    • Key in OFF position.
    • Disconnect: ABS Module C135
    • While spinning the suspect wheel at one revolution per second, measure the AC voltage between the ABS module C135 pins as follows:
      • For DTC C1297  , ABS module C135-4, circuit 514 (YE/RD), harness side and ABS module C135-5, circuit 516 (YE/BK), harness side.
      • For DTC C1296  , ABS module C135-20, circuit 521 (TN/OG), harness side and ABS module C135-21, circuit 522 (TN/BK), harness side.
      • For DTC C1298  , ABS module C135-1, circuit 523 (RD/PK), harness side and ABS module C135-3, circuit 524 (PK/BK), harness side.
      • For DTC C1299  , ABS module C135-22, circuit 518 (LG/RD), harness side and ABS module C135-23, circuit 519 (LG/BK), harness side.
    • Are the voltages between 100 and 3,500 millivolts AC? 
    1. YES  : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . REPEAT the self-test. If equipped with fire suppression system, go to  C6.
    2. NO  : Go to  C4.
  4. C4 CHECK THE WHEEL SPEED SENSOR CIRCUITS 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
    • For DTC C1145 (RF)  , measure the resistance between:
      • 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, circuit 516 (YE/BK), harness side.
    • For DTC C1155 (LF)  , measure the resistance between:
      • 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 (RR)  , measure the resistance between:
      • 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 (LR)  , measure the resistance between:
      • 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 519 (LG/BK), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  C5.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. TEST the system for normal operation. If equipped with fire suppression system, go to  C6.
  5. C5 CHECK THE SUSPECT WHEEL SPEED SENSOR FOR A SHORT TO GROUND 
      Fig 1: Checking Wheel Speed Sensor For Short To Ground
      GF0014025Courtesy of FORD MOTOR CO.
    • Measure the resistance between the suspect wheel speed sensor terminal and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . REPEAT the self-test. If equipped with fire suppression system, go to  C5.
    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. If equipped with fire suppression system, go to  C6.
  6. C6 REPOWER THE FIRE SUPPRESSION SYSTEM 
      WARNING: If the vehicle is equipped with a fire suppression system, repower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM article. Failure to follow these instructions may result in serious personal injury.
    • Verify that the fire suppression system is repowered. Refer to FIRE SUPPRESSION SYSTEM article.
    • Is the fire suppression system repowered? 
    1. YES  : Fire suppression system repowering is complete.
    2. NO  : REFER to FIRE SUPPRESSION SYSTEM article for fire suppression system depowering and repowering procedure.
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