Toyota 4Runner: Rear Speed Sensor RH Malfunction (C1403,C1273,C1274,C1404)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Rear Speed Sensor RH Malfunction (C1403,C1273,C1274,C1404)

DESCRIPTION

Refer to DTCs C1401 and C1402 (See page ).

DTC Code	DTC Detection Condition	Trouble Area
C1403 C1404	One of the following conditions is met: At a vehicle speed of 10 km/h (6 mph) or more, the output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more. At a vehicle speed of less than 10 km/h (6 mph), the output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more. At a vehicle speed of less than 10 km/h (6 mph), the outputs from both rear speed sensors are 0 km/h (0 mph) for 15 seconds or more.	Rear speed sensor RH/LH Speed sensor rotor Sensor installation
C1273 C1274	Stored only during test mode.	Rear speed sensor RH/LH Speed sensor rotor Sensor installation

DTC Code

DTC Detection Condition

Trouble Area

C1403

C1404

One of the following conditions is met:

At a vehicle speed of 10 km/h (6 mph) or more, the output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.
At a vehicle speed of less than 10 km/h (6 mph), the output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.
At a vehicle speed of less than 10 km/h (6 mph), the outputs from both rear speed sensors are 0 km/h (0 mph) for 15 seconds or more.

Rear speed sensor RH/LH
Speed sensor rotor
Sensor installation

C1273

C1274

Stored only during test mode.

Rear speed sensor RH/LH
Speed sensor rotor
Sensor installation

HINT:

DTCs C1403 and C1273 are for the rear speed sensor RH.
DTCs C1404 and C1274 are for the rear speed sensor LH.

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CHECK REAR SPEED SENSOR INSTALLATION

(a) Turn the ignition switch off.

(b) Check the speed sensor installation.

OK:

There is no clearance between the sensor and the rear axle.

The installation nut is tightened properly.

Torque:

7.8 N*m (80 kgf*cm, 69 in.*lbf)

Text in Illustration

*1	Rear Speed Sensor
*a	No clearance
*b	OK
*c	NG

INSTALL REAR SPEED SENSOR CORRECTLY

2.	INSPECT REAR SPEED SENSOR TIP

(a) Remove the rear speed sensor (See page ).

(b) Check the speed sensor tip.

OK:

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

NOTICE:

If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

CLEAN OR REPLACE REAR SPEED SENSOR

3.	INSPECT REAR SPEED SENSOR ROTOR

(a) Remove the rear axle hub and bearing assembly (See page ).

(b) Check the speed sensor rotor.

OK:

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

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.

CLEAN OR REPLACE REAR SPEED SENSOR ROTOR

4.	READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
RR Wheel Speed	Rear speed sensor RH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Actual wheel speed	No large fluctuations when driving at a constant speed.
RL Wheel Speed	Rear speed sensor LH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)	Actual wheel speed	No large fluctuations when driving at a constant speed.

(f) Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.

HINT:

Factors that affect the indicated vehicle speed include tire size, tire inflation and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart (See page ).

OK:

The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

USE SIMULATION METHOD TO CHECK

5.	REPLACE REAR SPEED SENSOR

(a) Replace the rear speed sensor (See page
).

6.	RECONFIRM DTC

(a) Clear the DTCs (See page ).

(b) Turn the ignition switch off.

(d) Drive the vehicle at a speed of 40 km/h (25 mph) or more or at least 60 seconds.

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

Result

Result	Proceed to
DTCs C1403 and C1404 are not output	A
DTCs C1403 and/or C1404 are output	B

END

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

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