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Home >> Ford >> 2004 >> Excursion 6.0 P, RWD >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 406 (Anti-Lock Control System) >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test F: DTC C1233, DTC C1234, DTC C1235, DTC C1236- Wheel Speed Sensor Input Signal Missing
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Pinpoint Test F: DTC C1233, DTC C1234, DTC C1235, DTC C1236- Wheel Speed Sensor Input Signal Missing

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. 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.
NOTE: Vehicles without traction control and stability assist have a single rear wheel speed sensor mounted to the rear differential. DTCs C1235 and C1236 will be set if there is a rear wheel speed sensor input signal missing; C1235 can be disregarded.
  1. F1 CHECK THE DTCs FROM THE SELF-TEST 
    • Using the recorded results from the ABS self-test:
    • Are DTCs C1145, C1155, C1165, or C1175 present? 

    Yes 

    Go To PINPOINT TEST E .

    No 

    GO to F2.

  2. F2 MONITOR THE WHEEL SPEED PIDS 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: ABS Module PIDs.
    • Use the diagnostic tool to 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? 

    Yes 

    CLEAR the DTCs. DRIVE the vehicle. RETRIEVE the DTCs. If DTC C1233, C1234, C1235 or C1236 is present, GO to F9.

    No 

    GO to F3.

  3. F3 INSPECT THE WHEEL SPEED SENSOR MOUNTING 
    • Key in OFF position.
    • Raise and support the vehicle. Refer to JACKING & LIFTING .
    • Inspect the wheel speed sensor for looseness.
    • Is the wheel speed sensor loose? 

    Yes 

    TORQUE the wheel speed sensor to specification. CLEAR the DTCs. GO to F4.

    No 

    GO to  F5.

  4. F4 RECHECK THE WHEEL SPEED PIDS 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: ABS Module PIDs.
    • Use the diagnostic tool to 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? 

    Yes 

    The vehicle is OK. Concern may have been caused by a loose wheel speed sensor.

    No 

    GO to F5.

  5. F5 CHECK THE WHEEL SPEED SENSOR FOR DAMAGE 
    • Key in OFF position.
    • Raise and support the vehicle. Refer to JACKING & LIFTING .
    • CAUTION: 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 wheel speed sensor for general damage.
    • Is the wheel speed sensor OK? 

    Yes 

    INSTALL a new wheel speed sensor. REFER to FRONT WHEEL SPEED SENSOR  or REAR WHEEL SPEED SENSOR . CLEAR the DTCs. TEST the system for normal operation.

    No 

    GO to F6.

  6. F6 CHECK FOR WHEEL SPEED SENSOR RING DAMAGE 
    • Remove the wheel speed sensor. Refer to FRONT WHEEL SPEED SENSOR  or REAR WHEEL SPEED SENSOR .
    • Inspect the 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? 

    Yes 

    GO to F7.

    No 

    INSTALL a new hub and bearing (front wheel), rear halfshaft (rear wheel) or ring gear. REFER to SUSPENSION SYSTEM-GENERAL INFORMATION or DRIVELINE SYSTEM respectively. CLEAR the DTCs. REPEAT the self-test.

  7. F7 CHECK FOR BEARING DAMAGE 
    • Inspect the wheel bearings for damage.
    • Are the wheel bearings OK? 

    Yes 

    GO to F8.

    No 

    INSTALL a new wheel bearing as necessary. REFER to SUSPENSION SYSTEM-GENERAL INFORMATION . CLEAR the DTCs. REPEAT the self-test.

  8. F8 CHECK THE ABS MODULE OUTPUT 
    • Key in OFF position.
    • Disconnect: Suspect Wheel Speed Sensor.
    • Key in ON position.
    • Measure the voltage between the suspect wheel speed sensor pins, harness side.
      Fig 1: Measuring Voltage Between Suspect Wheel Speed Sensor Pins, Harness Side
      G03180313Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes 

    INSTALL a new wheel speed sensor. REFER to FRONT WHEEL SPEED SENSOR  or REAR WHEEL SPEED SENSOR . CLEAR the DTCs. REPEAT the self-test.

    No 

    GO to F9.

  9. F9 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect all ABS connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all ABS connectors and make sure they seat 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 . TEST the system for normal operation.

    No 

    The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

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