Toyota Venza: Speed Sensor Rotor Faulty (C1237/37,C1275/75-C1278/78)

DESCRIPTION

The skid control ECU measures the speed of each wheel by receiving signals from the speed sensor.

These signals are used for recognizing that all four wheels are operating properly.

Therefore, all wheel signals must be equal.

DTCs C1275/75 to C1278/78 will be cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1275/75 to C1278/78 are output only in Test Mode.

DTC Code	DTC Detection Condition	Trouble Area
C1237/37	Any of the following is detected: Discrepancy among four wheel speed sensor output. Abnormal pulse signals from 3 or more sensors. Continuous ABS control is performed on at least 2 wheels for 60 seconds or more.	Tire and wheel size Tire deformation Speed sensor rotor Speed sensor Speed sensor circuit Brake actuator assembly (Skid control ECU)
C1275/75 C1276/76 C1277/77 C1278/78	Detected only during Test Mode	Speed sensor rotor

WIRING DIAGRAM

Refer to DTCs C0200/31, C0205/32, C0210/33, C0215/34, C1330/35, C1331/36, C1332/38 and C1333/39 (See page for front, or
for rear).

CAUTION / NOTICE / HINT

HINT:

When C0200/31, C0205/32, C0210/33, C0215/34, C1330/35, C1331/36, C1332/38 and/or C1333/39 is output together with C1237/37, inspect and repair the trouble areas indicated by C0200/31, C0205/32, C0210/33, C0215/34, C1330/35, C1331/36, C1332/38 and/or C1333/39 first (See page for front, or
for rear).

PROCEDURE

1.	CHECK TIRES

(a) Check the size and condition of all four wheels (See page ).

HINT:

The DTC is output when tire deformation or a difference in tire size is detected.

OK:

The diameter of all four tires and air pressure are the same.

Result	Proceed to
OK (except for rear 2WD)	A
OK (for rear 2WD)	B
NG	C

B

GO TO STEP 9

C

REPLACE TIRES SO THAT ALL FOUR TIRES ARE THE SAME SIZE

A

2.	CHECK SPEED SENSOR AND SPEED SENSOR ROTOR

(a) Remove the speed sensor and speed sensor rotor (See page for front, or
for rear).

(b) Check the speed sensor tip and speed sensor rotor.

OK:

No scratches, oil, or foreign matter on the sensor tip and rotor.

NOTICE:

Check the speed sensor signal after cleaning or replacement (See page ).

NG

CLEAN OR REPLACE SPEED SENSOR OR SPEED SENSOR ROTOR

OK

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

(a) Install the speed sensor and speed sensor rotor.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

(c) Disconnect the skid control ECU connector and the speed sensor connector.

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

Standard Resistance:

for RH

Tester Connection	Condition	Specified Condition
A42-9 (FR+) - A26-1 (FR+)	Always	Below 1 Ω
A42-9 (FR+) - Body ground	Always	10 kΩ or higher
A42-10 (FR-) - A26-2 (FR-)	Always	Below 1 Ω
A42-10 (FR-) - Body ground	Always	10 kΩ or higher
A42-8 (RR+) - M13-1 (RR+)	Always	Below 1 Ω
A42-8 (RR+) - Body ground	Always	10 kΩ or higher
A42-29 (RR-) - M13-2 (RR-)	Always	Below 1 Ω
A42-29 (RR-) - Body ground	Always	10 kΩ or higher

for LH

Tester Connection	Condition	Specified Condition
A42-26 (FL+) - A27-1 (FL+)	Always	Below 1 Ω
A42-26 (FL+) - Body ground	Always	10 kΩ or higher
A42-5 (FL-) - A27-2 (FL-)	Always	Below 1 Ω
A42-5 (FL-) - Body ground	Always	10 kΩ or higher
A42-6 (RL+) - L18-1 (RL+)	Always	Below 1 Ω
A42-6 (RL+) - Body ground	Always	10 kΩ or higher
A42-27 (RL-) - L18-2 (RL-)	Always	Below 1 Ω
A42-27 (RL-) - Body ground	Always	10 kΩ or higher

Text in Illustration

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))
*2	Front view of wire harness connector (to Front Speed Sensor)
*3	Front view of wire harness connector (to Rear Speed Sensor)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.	RECONFIRM DTC

(a) Reconnect the skid control ECU connector and the speed sensor connector.

(b) Clear the DTCs (See page ).

(c) Start the engine.

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

(e) Check if the same DTC is recorded (See page ).

Result	Proceed to
DTC (C1237/37) is output	A
DTC (C1237/37) is not output	B

B

CHECK FOR INTERMITTENT PROBLEMS

A

5.	REPLACE SPEED SENSOR

(a) Turn the ignition switch off.

(b) Replace the speed sensor (See page for
front, or for rear).

NOTICE:

Check the speed sensor signal after replacement (See page ).

NEXT

6.	RECONFIRM DTC

(a) Clear the DTCs (See page ).

(b) Start the engine.

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

(d) Check if the same DTC is recorded (See page ).

Result	Proceed to
DTC (C1237/37) is output	A
DTC (C1237/37) is not output	B

B

END

A

7.	REPLACE SPEED SENSOR ROTOR

(a) Turn the ignition switch off.

(b) Remove the drive shaft assembly (See page for front, or
for rear).

(c) Replace the drive outboard joint shaft assembly (speed sensor rotor) (See page for front, or
for rear).

HINT:

If the speed sensor rotor needs to be replaced, replace it together with the drive outboard joint shaft assembly.

NOTICE:

Check the speed sensor signal after replacement (See page ).

NEXT

8.	RECONFIRM DTC

(a) Install the drive shaft assembly.

(b) Clear the DTCs (See page ).

(c) Start the engine.

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

(e) Check if the same DTC is recorded (See page ).

Result	Proceed to
DTC (C1237/37) is output	A
DTC (C1237/37) is not output	B

A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

END

9.	CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

(b) Disconnect the skid control sensor wire.

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

Standard Resistance:

for RH

Tester Connection	Condition	Specified Condition
M13 ("A"-2) - M13 ("B"-1)	Always	Below 1 Ω
M13 ("A"-2) - M13 ("B"-2)	Always	10 kΩ or higher
M13 ("A"-2) - Body ground	Always	10 kΩ or higher
M13 ("A"-1) - M13 ("B"-2)	Always	Below 1 Ω
M13 ("A"-1) - M13 ("B"-1)	Always	10 kΩ or higher
M13 ("A"-1) - Body ground	Always	10 kΩ or higher

for LH

Tester Connection	Condition	Specified Condition
L18 ("A"-2) - L18 ("B"-1)	Always	Below 1 Ω
L18 ("A"-2) - L18 ("B"-2)	Always	10 kΩ or higher
L18 ("A"-2) - Body ground	Always	10 kΩ or higher
L18 ("A"-1) - L18 ("B"-2)	Always	Below 1 Ω
L18 ("A"-1) - L18 ("B"-1)	Always	10 kΩ or higher
L18 ("A"-1) - Body ground	Always	10 kΩ or higher

Text in Illustration

*1	Front view of skid control sensor wire
*2	for RH
*3	for LH
*4	Front view of wire harness connector (to Sensor Side Connector "A")
*5	Front view of wire harness connector (to Vehicle Side Connector "B")

NOTICE:

Check the speed sensor signal after replacement (See page ).

NG

REPLACE SKID CONTROL SENSOR WIRE

OK

10.	CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)

(a) Reconnect the skid control sensor wire.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

(c) Disconnect the skid control ECU connector and the rear speed sensor connector.

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

Standard Resistance:

for RH

Tester Connection	Condition	Specified Condition
A42-8 (RR+) - M13-1 (RR+)	Always	Below 1 Ω
A42-8 (RR+) - Body ground	Always	10 kΩ or higher
A42-29 (RR-) - M13-2 (RR-)	Always	Below 1 Ω
A42-29 (RR-) - Body ground	Always	10 kΩ or higher

for LH

Tester Connection	Condition	Specified Condition
A42-6 (RL+) - L18-1 (RL+)	Always	Below 1 Ω
A42-6 (RL+) - Body ground	Always	10 kΩ or higher
A42-27 (RL-) - L18-2 (RL-)	Always	Below 1 Ω
A42-27 (RL-) - Body ground	Always	10 kΩ or higher

Text in Illustration

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))
*2	Front view of wire harness connector (to Rear Speed Sensor)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.	RECONFIRM DTC

(a) Reconnect the skid control ECU connector and the rear speed sensor connector.

(b) Clear the DTCs (See page ).

(c) Start the engine.

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

(e) Check if the same DTC is recorded (See page ).

Result	Proceed to
DTC (C1237/37) is output	A
DTC (C1237/37) is not output	B

B

CHECK FOR INTERMITTENT PROBLEMS

A

12.	REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

(a) Turn the ignition switch off.

(b) Replace the rear speed sensor and the rear axle hub and bearing assembly (rear speed sensor rotor) (See page ).

HINT:

The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.

If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly with rear speed sensor.

NOTICE:

Check the speed sensor signal after replacement (See page ).

NEXT

13.	RECONFIRM DTC

(a) Clear the DTCs (See page ).

(b) Start the engine.

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

(d) Check if the same DTC is recorded (See page ).

Result	Proceed to
DTC (C1237/37) is output	A
DTC (C1237/37) is not output	B

A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

END