C1246 (blink 46) on Toyota Corolla E120: Master Cylinder Pressure Sensor Circuit

Short answer: C1246 means “Master Cylinder Pressure Sensor Circuit”. 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 ACTUATOR ASSY, BRAKE -> INSPECT ACTUATOR ASSY, BRAKE.

Code

C1246 · blink 46

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. Either of the following 1., 2., 3., or 4. is detected: 1. At the vehicle speed of 7 km/h (4 mph) or more, master cylinder pressure sensor does not change continues for 30 sec. 2. Interference occurs 7 times or more for 5 sec. 3. ECU terminal STP is OFF, and the condition that master cylinder pressure sensor voltage becomes more than 0.86 V or less than 0.3 V continues for 5 sec. or more. 4. Master cylinder pressure sensor circuit is open or short for 1.2 sec. or more.

Likely causes

1. Master cylinder pressure sensor; Master cylinder pressure sensor circuit

What to check, in order

1. Workshop check order (RM821E): READ VALUE OF ACTUATOR ASSY, BRAKE -> INSPECT ACTUATOR ASSY, BRAKE

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

← C1241/41 C1249/49 →

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.