C1236 - Left Rear Wheel Speed Sensor Input Signal Missing
- Faulty Left Rear Wheel Speed Sensor
- Left Rear Wheel Speed Sensor harness is open or shorted
- Left Rear Wheel Speed Sensor circuit poor electrical connection
- ABS Warning light ON
The active wheel speed sensor generates a signal that is sent to the ABS module. The wheel speed sensor circuitry connects to the ABS module 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 to all of the wheel speed sensors through their circuitry to determine if they are functional.
The ABS module continuously monitors and compares the rotational speed of each wheel and when it detects an impending wheel lock, modulates brake pressure to the appropriate brake caliper. This is accomplished by triggering the hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the ABS module returns the solenoid valves to their normal position and normal (base) braking resumes.
C1236 Information for specific makes
C1236 LEXUS Foreign Object Attached On Tip Of Left Front Sensor
C1236 LINCOLN Speed Wheel Left Rear Input Signal Missing
C1236 MERCURY Speed Wheel Left Rear Input Signal Missing
C1236 SCION Foreign Object Attached On Tip Of Left Front Sensor
C1236 TOYOTA Foreign Object Attached On Tip Of Left Front Sensor
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