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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1124 (Anti-Lock Brake System) >> Diagnostic Tests >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test D: DTCs C1222, C1233, C1234, C1235 and C1236 - Wheel Speed Sensor Input Signal Missing/Mismatch >> PINPOINT TEST D: DTCs C1222, C1233, C1234, C1235 AND C1236 - WHEEL SPEED SENSOR INPUT SIGNAL MISSING/MISMATCH

PINPOINT TEST D: DTCs C1222, C1233, C1234, C1235 AND C1236 - WHEEL SPEED SENSOR INPUT SIGNAL MISSING/MISMATCH

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. 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 multi-meter probes.
  1. D1 CHECK THE ABS HARNESS AND MODULE FOR WATER INTRUSION 
    • Key in OFF position.
    • Disconnect: ABS Module C135
    • Inspect the ABS module connector and module for water intrusion.
    • Is there any evidence of water entry?  
    1. YES  : CLEAN the connector and dry it out with low pressure compressed air. INSPECT for evidence of water entry and repair as necessary. TEST DRIVE the vehicle above 32 km/h (20 mph) and CARRY OUT at least one ABS stop.
    2. NO  : Go to  D2.
  2. D2 RETRIEVE ABS MODULE DTCs 
    • Connect: ABS Module C135
    • Connect the diagnostic tool.
    • Key in ON position.
    • Retrieve and record all ABS module DTCs.
    • Are DTCs C1145, C1155, C1165 or C1175 present? 
    1. YES  : Go to Pinpoint Test C .
    2. NO  : For DTC C1222 Go to  D7.

      For DTCs C1233, C1234, C1235 and C1236, if the active wheel speed sensor tool is available, go to  D3. If the active wheel speed sensor tool is not  available, go to  D5.

      For all other DTCs, go to the Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Chart.

  3. D3 CHECK THE ABS MODULE OUTPUT USING THE SPECIAL TOOL 
    • Key in OFF position.
    • Disconnect: Suspect Wheel Speed Sensor Connector
    • 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  D4.
    2. NO  : Go to  D5.
  4. D4 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE SPECIAL TOOL 
    • Raise the suspect wheel until it can spin freely. Refer to JACKING AND LIFTING .
    • 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  : INSPECT the wheel speed sensor tone ring for damage and looseness. INSTALL new components as necessary. If the tone ring is OK, 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. REFER to Wheel Speed Sensor - Front  or 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. REFER to Wheel Speed Sensor - Front  or Wheel Speed Sensor - Rear . CLEAR the DTCs. REPEAT the self-test.

  5. D5 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN 
    NOTE: Both circuits must be checked for each DTC.
    • Key in OFF position.
    • For DTC C1233  , measure the resistance between:
      • ABS module C135-27, circuit VCA03 (VT/WH), harness side and LF wheel speed sensor C150-1, circuit VCA03 (VT/WH), harness side.
      • ABS module C135-28, circuit RCA17 (YE), harness side and LF wheel speed sensor C150-2, circuit RCA17 (YE), harness side.
    • For DTC C1234  , measure the resistance between:
      • ABS module C135-3, circuit VCA05 (GY/VT), harness side and RF wheel speed sensor C160-1, circuit VCA05 (GY/VT), harness side.
      • ABS module C135-4, circuit RCA19 (VT), harness side and RF wheel speed sensor C160-2, circuit RCA19 (VT), harness side.
    • For DTC C1235  , measure the resistance between:
      • ABS module C135-10, circuit RCA20 (BN), harness side and RR wheel speed sensor C426-2, circuit RCA20 (BN), harness side.
      • ABS module C135-11, circuit VCA06 (WH/OG), harness side and RR wheel speed sensor C426-1, circuit VCA06 (WH/OG), harness side.
    • For DTC C1236  , measure the resistance between:
      • ABS module C135-35, circuit RCA18 (BN/GN), harness side and LR wheel speed sensor C440-1, circuit RCA18 (BN/GN), harness side.
      • ABS module C135-36, circuit VCA04 (BU/OG), harness side and LR wheel speed sensor C440-2, circuit VCA04 (BU/OG), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  D6.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  6. D6 CHECK THE WHEEL SPEED SENSOR OUTPUT 
    • Key in OFF position.
    • Disconnect: Suspect Wheel Speed Sensor
      • Fig 1: Connecting Fused (5A) Jumper Wire Between LF Wheel Speed Sensor C150-1, Circuit VCA03 (VT/WH)
      GF0003402Courtesy of FORD MOTOR CO.
    • For DTC C1233  :
      • connect a fused (5A) jumper wire between LF wheel speed sensor C150-1, circuit VCA03 (VT/WH), harness side and LF wheel speed sensor C150 pin-1, component side.
      • connect the automotive meter between LF wheel speed sensor C150-2, circuit RCA17 (YE), harness side and LF wheel speed sensor C150 pin-2, component side.
    • For DTC C1234  :
      • connect a fused (5A) jumper wire between RF wheel speed sensor C160-1, circuit VCA05 (GN/VT), harness side and RF wheel speed sensor C160 pin-1, component side.
      • connect the automotive meter between RF wheel speed sensor C160-2, circuit RCA19 (VT), harness side and RF wheel speed sensor C160 pin-2, component side.
    • For DTC C1235  :
      • connect a fused (5A) jumper wire between RR wheel speed sensor C426-1, circuit VCA06 (WH/OG), harness side and RR wheel speed sensor C426 pin-1, component side.
      • connect the automotive meter between RR wheel speed sensor C426-2, circuit RCA20 (BN), harness side and RR wheel speed sensor C426 pin-2, component side.
    • For DTC C1236  :
      • connect a fused (5A) jumper wire between LF wheel speed sensor C440-2, circuit VCA04 (BU/OG), harness side and LF wheel speed sensor C440 pin-1, component side.
      • connect the automotive meter between LF wheel speed sensor C4401-1, circuit RCA18 (BN/GN), harness side and LF wheel speed sensor C440 pin-2, component side.
    • Key in ON position.
    • Measure the current while slightly rotating the wheel, using incremental turns.
    • Does the wheel speed sensor output switch between the low state (4 to 8 mA) and the high state (12 to 16 mA)? 
    1. YES  : Go to  D8.
    2. NO  : INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front  or Wheel Speed Sensor - Rear . CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
  7. D7 CHECK FOR CORRECT TIRE SIZE AND AIR PRESSURE 
    • Make sure all tire sizes are correct and matching.
    • Make sure all tire pressures are correct.
    • Clear the DTCs, drive the vehicle and carry out the self-test.
    • Is DTC C1222 still present? 
    1. YES  : Go to  D8.
    2. NO  : The system is operating correctly at this time.
  8. D8 CHECK THE ABS MODULE ELECTRICAL CONNECTOR 
    • Key in OFF position.
    • Disconnect: ABS C135
    • Check the ABS module connector for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: ABS C135
    • Make sure the ABS connector seats correctly.
    • TEST DRIVE the vehicle above 32 km/h (20 mph), CARRY OUT at least one ABS stop and VERIFY the concern is still present.
    • Is the concern still present? 
    1. YES  : INSPECT the wheel speed sensor tone ring for damage and looseness. INSTALL new components as necessary. If the tone ring is OK, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . CALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. TEST DRIVE the vehicle above 32 km/h (20 mph) and CARRY OUT at least one ABS stop.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST DRIVE the vehicle above 32 km/h (20 mph) and CARRY OUT at least one ABS stop.
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