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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1072 (Anti-Lock Brake System) >> Diagnostic Tests >> Anti-Lock Control - Non-Hybrid >> Pinpoint Tests >> Pinpoint Test D: DTCs C1233 (LF), C1234 (RF), C1235 (RR) or C1236 (LR) - Wheel Speed Sensor Input Signal Missing >> PINPOINT TEST D: DTCs C1233 (LF), C1234 (RF), C1235 (RR) OR C1236 (LR) - WHEEL SPEED SENSOR INPUT SIGNAL MISSING

PINPOINT TEST D: DTCs C1233 (LF), C1234 (RF), C1235 (RR) OR C1236 (LR) - WHEEL SPEED SENSOR INPUT SIGNAL MISSING

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. D1 CHECK THE DTCs FROM THE SELF-TEST 
    • Check the recorded results from the ABS self-test.
    • Are DTCs C1145, C1155, C1165 or C1175 present? 
    1. YES  : Go to Pinpoint Test C .
    2. NO  : Go to  D2.
  2. D2 MONITOR THE WHEEL SPEED SENSOR PIDs 
    • Enter the following diagnostic mode on the diagnostic tool: ABS Module PIDs
    • Monitor the wheel speed PIDs while driving the vehicle at a constant speed.
    • Are the wheel speed PIDs consistent with the vehicle and each other? 
    1. YES  : CLEAR the DTCs. DRIVE the vehicle. RETRIEVE the DTCs. If DTC C1233, C1234, C1235 or C1236 is present, go to  D13.

      For all other DTCs, go to ABS Module DTC Chart .

    2. NO  : Go to  D3.
  3. D3 INSPECT THE WHEEL SPEED SENSOR MOUNTING 
    • Key in OFF position.
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING AND LIFTING article.
    • Inspect the suspect wheel speed sensor for looseness.
    • Is the wheel speed sensor loose? 
    1. YES  : TIGHTEN the wheel speed sensor to specification. REFER to SPECIFICATIONS . CLEAR the DTCs. Go to  D4.
    2. NO  : Go to  D5.
  4. D4 RECHECK THE WHEEL SPEED PIDs 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Using the scan tool, monitor the ABS module wheel speed sensor PIDs while driving the vehicle at a constant speed.
    • Are all the wheel speed sensor PID values similar? 
    1. YES  : The vehicle is OK. The concern may have been caused by a loose wheel speed sensor.
    2. NO  : Go to  D5.
  5. D5 INSPECT THE WHEEL SPEED SENSOR FOR DAMAGE 
      NOTE: Examine the wheel speed sensor wire carefully with a good light source. Failure to verify damage in the wheel speed sensor wire can lead to unnecessary installation of a new component.
    • Inspect the suspect wheel speed sensor for general damage.
    • Is the wheel speed sensor OK? 
    1. YES  : Go to  D6.
    2. NO  : INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front  or Wheel Speed Sensor - Rear . CLEAR the DTCs. REPEAT the self-test.
  6. D6 INSPECT THE WHEEL SPEED SENSOR RING FOR DAMAGE 
    • Inspect the suspect wheel speed sensor ring for damaged or missing teeth. Rotate the wheel to verify that no teeth are missing.
    • Is the wheel speed sensor ring OK? 
    1. YES  : Go to  D7.
    2. NO  : INSTALL a new front or rear halfshafts. REFER to FRONT DRIVE HALFSHAFTS article for front halfshafts and REAR DRIVE HALFSHAFTS article for rear halfshafts. CLEAR the DTCs. REPEAT the self-test.
  7. D7 INSPECT THE WHEEL BEARING FOR DAMAGE 
    • Inspect the wheel bearings for damage.
    • Are the wheel bearings OK? 
    1. YES  : If the active wheel speed sensor tool is available, go to  D8.

      If the active wheel speed sensor tool is not available, go to  D10.

    2. NO  : INSTALL a new wheel bearing and wheel hub as necessary. REFER to FRONT SUSPENSION article for front wheel hubs or REAR SUSPENSION article for rear wheel hubs. CLEAR the DTCs. REPEAT the self-test.
  8. D8 CHECK THE ABS MODULE OUTPUT USING THE SPECIAL TOOL 
    • Key in OFF position.
    • Disconnect: Suspect Wheel Speed Sensor
    • Connect the special tool to the wheel speed sensor connectors.
    • Key in ON position.
    • Select the correct system polarity on the special tool and turn the special tool power switch to the ON position.
    • Is the module output LED illuminated? 
    1. YES  : Go to  D9.
    2. NO  : Go to  D12.
  9. D9 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE SPECIAL TOOL 
    • Raise the suspect wheel until it can spin freely. Refer to JACKING AND LIFTING article.
    • While monitoring the special tool, slowly spin the suspect wheel.
    • Do the sensor output LEDs illuminate and flash and is the current overload LED not illuminated? 
    1. YES  : 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.
    2. NO  : If the current level LED is not illuminated and the sensor output LEDs do not illuminate or if the current level LED is illuminated red, INSTALL a new wheel speed sensor. For the front wheel speed sensor, REFER to Wheel Speed Sensor - Front . For the rear wheel speed sensor, REFER to Wheel Speed Sensor - Rear . CLEAR the DTCs. REPEAT the self-test.

      If the current level LED is not illuminated and the sensor output LEDs illuminate green but do not flash, INSPECT the wheel speed sensor tone ring and INSTALL new if necessary. If the tone ring is OK, INSTALL a new wheel speed sensor. For the front wheel speed sensor, REFER to Wheel Speed Sensor - Front . For the rear wheel speed sensor, REFER to Wheel Speed Sensor - Rear . CLEAR the DTCs. REPEAT the self-test.

  10. D10 CHECK THE ABS MODULE OUTPUT 
    • Key in OFF position.
    • Disconnect: Suspect Wheel Speed Sensor
    • Key in ON position.
    • For DTC C1233  , measure the voltage between LF wheel speed sensor C150-1, circuit RCA17 (YE), harness side and LF wheel speed sensor C150-2, circuit VCA03 (VT/WH), harness side.
    • For DTC C1234  , measure the voltage between RF wheel speed sensor C160-1, circuit RCA19 (VT), harness side and RF wheel speed sensor C160-2, circuit VCA05 (GY/VT), harness side.
    • For DTC C1235  , measure the voltage between RR wheel speed sensor C426-1, circuit RCA20 (BN), harness side and RR wheel speed sensor C426-2, circuit VCA06 (WH/OG), harness side.
    • For DTC C1236  , measure the voltage between LR wheel speed sensor C440-1, circuit RCA18 (BN/GN), harness side and LR wheel speed sensor C440-2, circuit VCA04 (BU/OG), harness side.
      • Fig 1: Checking Circuit For Voltage
      GF0024667Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  D11.
    2. NO  : Go to  D12.
  11. D11 CHECK THE WHEEL SPEED SENSOR OUTPUT 
    • Disconnect: Suspect Wheel Speed Sensor
    • For DTC C1233  , connect the meter between LF wheel speed sensor C150-1, circuit RCA17 (YE), harness side and LF wheel speed sensor pin 1, component side. Connect a fused (5A) jumper wire between LF wheel speed sensor C150-2, circuit RCA17 (YE), harness side and LF wheel speed sensor pin 2, component side.
      • Fig 2: Checking Wheel Speed Sensor Output
      GF0003402Courtesy of FORD MOTOR CO.
    • For DTC C1234  , connect the meter between LF wheel speed sensor C160-1, circuit RCA17 (YE), harness side and LF wheel speed sensor pin 1, component side. Connect a fused (5A) jumper wire between LF wheel speed sensor C160-2, circuit RCA17 (YE), harness side and LF wheel speed sensor pin 2, component side.
    • For DTC C1235  , connect the meter between RR wheel speed sensor C426-1, circuit RCA17 (YE), harness side and RR wheel speed sensor pin 1, component side. Connect a fused (5A) jumper wire between RR wheel speed sensor C426-2, circuit RCA17 (YE), harness side and RR wheel speed sensor pin 2, component side.
    • For DTC C1236  , connect the meter between LR wheel speed sensor C440-1, circuit RCA17 (YE), harness side and LR wheel speed sensor pin 1, component side. Connect a fused (5A) jumper wire between LR wheel speed sensor C440-2, circuit RCA17 (YE), harness side and LR wheel speed sensor pin 2, component side.
    • Key in ON position.
    • Measure the current while slightly rotating the wheel, using incremental turns.
    • Does the automotive meter switch between the low state (5 to 8 mA) and the high state (12 to 16 mA)? 
    1. YES  : Go to  D13.
    2. NO  : INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front  or Wheel Speed Sensor - Rear . CLEAR the DTCs. REPEAT the self-test.
  12. D12 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN 
    NOTE: Both circuits must be checked for each DTC.
    • For vehicles equipped with a 3.0L engine  , with the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING AND LIFTING article.
    • Key in OFF position.
    • Disconnect: ABS Module C155
    • Disconnect: Suspect Wheel Speed Sensor
    • For DTC C1233  : measure the resistance between:
      • ABS module C155-45, circuit VCA03 (VT/WH), harness side and LF wheel speed sensor C150-2, circuit VCA03 (VT/WH), harness side.
      • ABS module C155-46, circuit RCA17 (YE), harness side and LF wheel speed sensor C150-1, circuit RCA17 (YE), harness side.
      • Fig 3: Measuring Resistance
      GF0042291Courtesy of FORD MOTOR CO.
    • For DTC C1234  : measure the resistance between:
      • ABS module C155-34, circuit VCA05 (GY/VT), harness side and RF wheel speed sensor C160-2, circuit VCA05 (GY/VT), harness side.
      • ABS module C155-33, circuit RCA19 (VT), harness side and RF wheel speed sensor C160-1, circuit RCA19 (VT), harness side.
      • Fig 4: Measuring Resistance
      GF0042290Courtesy of FORD MOTOR CO.
    • For DTC C1235  : measure the resistance between:
      • ABS module C155-43, circuit VCA06 (WH/OG), harness side and RR wheel speed sensor C426-1, circuit VCA06 (WH/OG), harness side.
      • ABS module C155-42, circuit RCA20 (BN), harness side and RR wheel speed sensor C426-2, circuit RCA20 (BN), harness side.
      • Fig 5: Measuring Resistance
      GF0042292Courtesy of FORD MOTOR CO.
    • For DTC C1236  : measure the resistance between:
      • ABS module C155-36, circuit VCA04 (BU/OG), harness side and LR wheel speed sensor C440-1, circuit VCA04 (BU/OG), harness side.
      • ABS module C155-37, circuit RCA18 (BN/GN), harness side and LR wheel speed sensor C440-2, circuit RCA18 (BN/GN), harness side.
      • Fig 6: Measuring Resistance
      GF0042293Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  D13.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  13. D13 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect all the ABS connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • 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? 
    1. YES  : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.
    2. 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.
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