C1235/35

DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS control system. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Element). The speed sensor rotor, which consists of 48 sets of N and S poles that are arranged in a circle, is integrated with the inner race of the hub bearing.
To detect the rotation direction, the output waves are used to determine the relationship of the pulses that are generated by 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward wave to the ECU.
DTCs C1275/75 to C1278/78 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1275/75 to C1278/78 are output only in the Test Mode.

DTC No.	DTC Detection Condition	Trouble Area
C1235/35 C1236/36 C1238/38 C1239/39	When either of the following is detected: At a vehicle speed of 12 mph (20 km/h) or more, noise occurs in the sensor signal from the abnormal wheel for 5 seconds or more. At a vehicle speed of 6 mph (10 km/h) or more, noise is input once per rotor rotation for 15 seconds or more.	Speed sensor Speed sensor rotor Sensor installation Brake actuator assembly (Skid control ECU)

HINT:

1. DTC C1235/35 is for the front speed sensor RH.
   
2. DTC C1236/36 is for the front speed sensor LH.
   
3. DTC C1238/38 is for the rear speed sensor RH.
   
4. DTC C1239/39 is for the rear speed sensor LH.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration (Click here).

HINT:

When C0200/31, C0205/32, C0210/33, or C0215/34 is output together with C1235/35, C1236/36, C1238/38, or C1239/39, inspect and repair the trouble areas indicated by C0200/31, C0205/32, C0210/33, or C0215/34 first.

1. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - EACH SPEED SENSOR)

1. Disconnect the skid control ECU connector and each speed sensor connector.

2. Measure the resistance according to the value(s) in the table below.
   

   Standard resistance:

   RH:

   Tester Connection	Condition	Specified Condition
   A14-3 (FR+) - V1-2 (FR+)	Always	Below 1 Ω
   A14-3 (FR+) - Body ground	Always	10 kΩ or higher
   A14-17 (FR-) - V1-1 (FR-)	Always	Below 1 Ω
   A14-17 (FR-) - Body ground	Always	10 kΩ or higher
   A14-5 (RR+) - X1-2 (RR+)	Always	Below 1 Ω
   A14-5 (RR+) - Body ground	Always	10 kΩ or higher
   A14-19 (RR-) - X1-1 (RR-)	Always	Below 1 Ω
   A14-19 (RR-) - Body ground	Always	10 kΩ or higher

   LH:

   Tester Connection	Condition	Specified Condition
   A14-18 (FL+) - W1-2 (FL+)	Always	Below 1 Ω
   A14-18 (FL+) - Body ground	Always	10 kΩ or higher
   A14-4 (FL-) - W1-1 (FL-)	Always	Below 1 Ω
   A14-4 (FL-) - Body ground	Always	10 kΩ or higher
   A14-20 (RL+) - Y1-2 (RL+)	Always	Below 1 Ω
   A14-20 (RL+) - Body ground	Always	10 kΩ or higher
   A14-6 (RL-) - Y1-1 (RL-)	Always	Below 1 Ω
   A14-6 (RL-) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2. INSPECT SKID CONTROL ECU (SENSOR INPUT)

1. Reconnect the skid control ECU connector.

2. Turn the engine switch on (IG).

3. Measure the voltage according to the value(s) in the table below.
   

   Standard voltage:

   RH:

   Tester Connection	Condition	Specified Condition
   V1-2 (FR+) - Body ground	Engine switch on (IG)	7.5 to 14 V
   X1-2 (RR+) - Body ground	Engine switch on (IG)	7.5 to 14 V

   LH:

   Tester Connection	Condition	Specified Condition
   W1-2 (FL+) - Body ground	Engine switch on (IG)	7.5 to 14 V
   Y1-2 (RL+) - Body ground	Engine switch on (IG)	7.5 to 14 V

NG	REPLACE BRAKE ACTUATOR ASSEMBLY

OK

3. RECONFIRM DTC

1. Turn the engine switch off.

2. Reconnect the speed sensor connector.

3. Clear the DTC (Click here).

4. Start the engine.

5. Drive the vehicle at the speed of 12 mph (20 km/h) or more for at least 60 seconds.

6. Check if the same DTC is recorded (Click here).
   

   Result:

   Condition	Proceed to
   DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output (for rear)	A
   DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output (for front)	B
   DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are not output	C

B	Go to step 5
C	USE SIMULATION METHOD TO CHECK

A

4. CHECK REAR SPEED SENSOR TIP

1. Turn the engine switch off.

2. Remove the rear speed sensor (Click here).

3. Check the speed sensor tip.

   OK:

   No scratches or foreign matter on the sensor tip.
   

   NOTICE:

   Check the speed sensor signal after cleaning/replacement (Click here).

NG	CLEAN OR REPLACE REAR SPEED SENSOR

OK

5. CHECK EACH SPEED SENSOR ROTOR

1. Turn the engine switch off.

2. Remove each speed sensor rotor.

3. Check the speed sensor rotor.

   OK:

   No scratches, oil, or foreign matter on the rotors.
   

   NOTICE:

   Check the speed sensor signal after cleaning/replacement (Click here).

NG	CLEAN OR REPLACE EACH SPEED SENSOR ROTOR

OK

6. RECONFIRM DTC

1. Install the speed sensor and the speed sensor rotor.

2. Clear the DTC (Click here).

3. Start the engine.

4. Drive the vehicle at the speed of 12 mph (20 km/h) or more for at least 60 seconds.

5. Check if the same DTC is recorded (Click here).
   

   Result:

   Condition	Proceed to
   DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output	A
   DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are not output	B

B	USE SIMULATION METHOD TO CHECK

A

7. REPLACE EACH SPEED SENSOR

1. Turn the engine switch off.

2. Replace each speed sensor (Click here for front, or Click here for rear).

   NOTICE:

   Check the speed sensor signal after replacement (Click here).

NEXT

8. RECONFIRM DTC

1. Clear the DTC (Click here).

2. Start the engine.

3. Drive the vehicle at the speed of 12 mph (20 km/h) or more for at least 60 seconds.

4. Check if the same DTC is recorded (Click here).
   

   Result:

   Condition	Proceed to
   DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output	A
   DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are not output	B

B	END

A
REPLACE BRAKE ACTUATOR ASSEMBLY