Toyota Tacoma 2015-2018 Service Manual: Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) (C1275,...,C1414)

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) (C1275,...,C1414)

DESCRIPTION

Refer to DTCs C1401 and C1402 (See page ).

DTC Code	DTC Detection Condition	Trouble Area
C1275 C1276	Stored only during test mode.	Front speed sensor RH/LH Front speed sensor rotor RH/LH (Front axle with ABS rotor bearing assembly RH/LH)
C1413 C1414	One of the following conditions is met: An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.	Front speed sensor RH/LH Skid control sensor wire Speed sensor circuit Front speed sensor rotor RH/LH (Front axle with ABS rotor bearing assembly RH/LH) Skid control ECU (master cylinder solenoid)

DTC Code

DTC Detection Condition

Trouble Area

C1275

C1276

Stored only during test mode.

Front speed sensor RH/LH
Front speed sensor rotor RH/LH (Front axle with ABS rotor bearing assembly RH/LH)

C1413

C1414

One of the following conditions is met:

An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more.
At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds.
At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.

Front speed sensor RH/LH
Skid control sensor wire
Speed sensor circuit
Front speed sensor rotor RH/LH (Front axle with ABS rotor bearing assembly RH/LH)
Skid control ECU (master cylinder solenoid)

HINT:

DTCs C1413 and C1275 are for the front speed sensor RH.
DTCs C1414 and C1276 are for the front speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1405 and C1406 (See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (master cylinder solenoid), perform calibration (See page ).
Check the speed sensor signal after cleaning or replacement (See page ).

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

GO TO STEP 9

2.	READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

GO TO STEP 5

3.	PERFORM TEST MODE (SIGNAL CHECK)

(a) Perform the signal check in the Test Mode Procedure (See page OK: OK: ).

OK:

All test mode DTCs are cleared.

GO TO STEP 5

4.	RECONFIRM DTC

(a) Clear the DTCs (See page (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

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

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

Result

Result	Proceed to
DTCs C1413 and C1414 are not output	A
DTCs C1413 and/or C1414 are output	B

USE SIMULATION METHOD TO CHECK

GO TO STEP 12

5.	CHECK FRONT SPEED SENSOR INSTALLATION

INSTALL FRONT SPEED SENSOR CORRECTLY

6.	INSPECT FRONT SPEED SENSOR TIP

CLEAN OR REPLACE FRONT SPEED SENSOR

7.	INSPECT FRONT SPEED SENSOR ROTOR

CLEAN OR REPLACE FRONT AXLE WITH ABS ROTOR BEARING ASSEMBLY

8.	INSPECT SKID CONTROL SENSOR WIRE

REPLACE SKID CONTROL SENSOR WIRE

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT SKID CONTROL ECU (FR+, FL+ TERMINAL)

REPLACE MASTER CYLINDER SOLENOID

11.	RECONFIRM DTC

(a) Clear the DTCs (See page (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

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

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

Result

Result	Proceed to
DTCs C1413 and C1414 are not output	A
DTCs C1413 and/or C1414 are output	B

USE SIMULATION METHOD TO CHECK

12.	REPLACE FRONT SPEED SENSOR

13.	RECONFIRM DTC

(a) Clear the DTCs (See page (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

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

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

Result

Result	Proceed to
DTCs C1413 and C1414 are not output	A
DTCs C1413 and/or C1414 are output	B

END

REPLACE FRONT AXLE WITH ABS ROTOR BEARING ASSEMBLY

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