CorollaFix

C1236 (blink 36) on Toyota Corolla E120: Foreign Matter is Attached on Tip of Left

Short answer: C1236 means “Foreign Matter is Attached on Tip of Left”. The car’s computer has found a fault in the ABS with BA & EBD system and turns on the ABS warning. First check: workshop check order (RM821E): READ VALUE OF SPEED SENSOR FRONT LH -> INSPECT SPEED SENSOR FRONT LH -> INSPECT HARNESS AND CONNECTOR (FRONT LEFT SPEED SENSOR − BRAKE -> INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS -> INSPECT SPEED SENSOR FRONT LH INSTALLATION -> INSPECT SPEED SENSOR FRONT LH TIP -> INSPECT FRONT DRIVE OUTBOARD JOINT SHAFT ASSY LH.

Code
C1236 · blink 36
System
ABS with BA & EBD
Dashboard light
ABS warning
Applies to
All E120 with ABS (BA & EBD)
Confidence
high (official Toyota RM821E)
Source
toyotamanuals.gitlab.io

Symptoms and when it is set

  1. Detection of any of conditions from 1. through 4.: 1. With vehicle speed at 10 km/h or more, sensor signal circuit of faulty wheel is open or short for 15 sec. or longer. 2. Momentary interruption of sensor signal of faulty wheel has occurred 7 times or more. 3. With vehicle speed at 20 km/h or more, sensor signal of faulty wheel generated noise for 5 sec. or longer. 4. Sensor signal circuit is open for 0.025 sec. or longer.

Likely causes

  1. Left front speed sensor; Speed sensor circuit; Sensor installation; Sensor rotor

What to check, in order

  1. Workshop check order (RM821E): READ VALUE OF SPEED SENSOR FRONT LH -> INSPECT SPEED SENSOR FRONT LH -> INSPECT HARNESS AND CONNECTOR (FRONT LEFT SPEED SENSOR − BRAKE -> INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS -> INSPECT SPEED SENSOR FRONT LH INSTALLATION -> INSPECT SPEED SENSOR FRONT LH TIP -> INSPECT FRONT DRIVE OUTBOARD JOINT SHAFT ASSY LH

Related on this car

Same code on other cars

← C1235/35 C1238/38 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.