ABS Lamp DTC’s C1235, C1236, C1237 – 2002-2004 Ford Lincoln Mercury

BRAKESABS LAMP ILLUMINATED AND DTC C1235, C1236, C1237 – VEHICLES WITH DIFFERENTIAL-MOUNTED REAR WHEEL SPEED SENSOR
FORD: 2002-2004 EXPLORER
LINCOLN: 2003-2004 AVIATOR
MERCURY: 2002-2004 MOUNTAINEER

 

Vehicles may exhibit an Anti-Lock Brake System (ABS) warning lamp illuminated with Diagnostic Trouble Codes (DTCs) C1235, C1236 and/or C1237 (Wheel Speed RR Input Signal Missing/Wheel Speed LR Input Signal Missing/Rear Wheel Speed Sensor Output Failure) stored in memory.

 

This may be due to an intermittently functioning differential-mounted Rear Wheel Speed Sensor.

NOTE: THIS ONLY APPLIES TO VEHICLES WITH DTCS C1235, C1236 AND/OR C1237. FOR ALL OTHER DTC’S, REFER TO THE APPROPRIATE WORKSHOP MANUAL.

NOTE: THIS DOES NOT APPLY TO VEHICLES EQUIPPED WITH ADVANCETRAC (STABILITY ASSIST / IVD).

 

SERVICE PROCEDURE

  1. Retrieve Continuous ABS DTC(s).
  2. If C1235, C1236 and/or C1237 are present, turn ignition OFF and replace the differential-mounted Rear Wheel Speed Sensor.
    1. Raise vehicle on hoist so that the bottom of the rear differential is at head level.
    2. Stand slightly in front of the rear differential pinion flange, facing the rear of the vehicle ( Figure 1 ).
    3. Reach up and over the passenger side of the differential housing to access sensor.
    4. Remove the hold-down bolt and remove sensor from differential housing (3/8″ socket).
    5. Unlatch red locking tab on the top of the electrical connector by sliding it away from the sensor, then release connector latch and disconnect connector from sensor.
    6. Install new sensor and torque hold-down bolt to 27 N-m (20 lb-ft).
    7. Connect the electrical connector to the sensor.

Differential-Mounted Rear Wheel Speed SensorFigure 1

 

NOTE: IT IS NO LONGER NECESSARY TO APPLY F8AZ-19G208-AA GREASE TO THE ELECTRICAL CONNECTOR AS PREVIOUSLY RECOMMENDED.

  • Clear Continuous ABS DTC(s).

NOTE: THE ABS SYSTEM CONFIRMS REAR WHEEL SPEED SENSOR SIGNAL INPUT BASED ON SEVERAL WHEEL REVOLUTIONS ABOVE 24 KM/H (15 MPH). DRIVE VEHICLE FOR AT LEAST 75 FEET AT OR ABOVE 15 MPH. IF WHEEL SPEED SIGNAL INPUT IS MISSING THE ABS LIGHT WILL ILLUMINATE.

 

PART NUMBER PART NAME
4L2Z-9E731-AA Wheel Speed Sensor

 

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