Toyota Tacoma (2015-2018) Service Manual: Front Speed Sensor RH Output Malfunction (C1413,C1414)

DESCRIPTION

Refer to DTCs C1401 and C1402 (See page ).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1413	Front Speed Sensor RH Output Malfunction	Any of the following is detected: 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 Front skid control rotor RH (Front axle hub inner bearing RH) Sensor installation Skid control ECU (Brake actuator assembly) Wire harness or connector
C1414	Front Speed Sensor LH Output Malfunction	Any of the following is detected: 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 LH Front skid control rotor LH (Front axle hub inner bearing LH) Sensor installation Skid control ECU (Brake actuator assembly) Wire harness or connector

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

WIRING DIAGRAM

Refer to DTCs C1405 and C1406 (See page ).

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page ).

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (See page ).

ABS/VSC/TRAC

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Speed Open	Front speed sensor RH open detection	Normal or Error	Normal	Error: Momentary interruption
FL Speed Open	Front speed sensor LH open detection	Normal or Error	Normal	Error: Momentary interruption

OK:

Normal (There are no momentary interruptions.)

HINT:

Perform the above inspection before removing the sensor and connector.

NG

GO TO STEP 4

OK

2.	READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(d) Turn the Techstream on.

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

(f) According to the display on the Techstream, read the Data List.

ABS/VSC/TRAC

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Wheel Speed	Front wheel speed sensor RH reading	Min.: 0 km/h (0 mph) Max.: 326.4 km/h (202 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations
FL Wheel Speed	Front wheel speed sensor LH reading	Min.: 0 km/h (0 mph) Max.: 326.4 km/h (202 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations

(g) 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).

HINT:

If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See page ).

NG

GO TO STEP 4

OK

3.	RECONFIRM DTC

(a) Clear the DTCs (See page ).

(b) Turn the ignition switch off.

(c) Start the engine.

(d) Perform a road test.

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

Result

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

A

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

4.	CHECK FRONT SPEED SENSOR INSTALLATION

(a) Turn the ignition switch off.

(b) Check the speed sensor installation (See page ). OK: There is no clearance between the sensor and the front steering knuckle. The installation bolt is tightened properly. Text in Illustration *a Normal *b Abnormal *c Clearance

NG

INSTALL FRONT SPEED SENSOR CORRECTLY

OK

5.	INSPECT FRONT SPEED SENSOR TIP

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

(b) Check the speed sensor tip.

OK:

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

Result

Proceed to
OK
NG

NG

CLEAN OR REPLACE FRONT SPEED SENSOR

OK

6.	INSPECT FRONT AXLE WITH ABS ROTOR BEARING ASSEMBLY

(a) Remove the front axle hub inner bearing (See page ).

(b) Check the front skid control rotor.

OK:

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

NOTICE:

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

(c) Reinstall the front speed sensor and the front axle hub inner bearing.

NG

CLEAN OR REPLACE FRONT AXLE HUB INNER BEARING

OK

7.	INSPECT SKID CONTROL SENSOR WIRE

(a) Remove the skid control sensor wire.

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

Standard Resistance:

Text in Illustration

*a	for RH	*b	for LH
*1	Skid Control Sensor Wire	-	-

for RH

Tester Connection	Condition	Specified Condition
Va1-1 - S4-1 (FR-)	Always	Below 1 Ω
Va1-2 - S4-2 (FR+)	Always	Below 1 Ω
Va1-1 - Va1-2	Always	10 kΩ or higher

for LH

Tester Connection	Condition	Specified Condition
Wa1-1 - S3-1 (FL-)	Always	Below 1 Ω
Wa1-2 - S3-2 (FL+)	Always	Below 1 Ω
Wa1-1 - Wa1-2	Always	10 kΩ or higher

NG

CLEAN OR REPLACE SKID CONTROL SENSOR WIRE

OK

8.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)

(a) Turn the ignition switch off.

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

(c) Disconnect the S1 skid control ECU (brake actuator assembly) connector and the A8 and/or A9 front 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
S1-31 (FR+) - S4-2 (FR+)	Always	Below 1 Ω
S1-30 (FR-) - S4-1 (FR-)	Always	Below 1 Ω
S1-31 (FR+) or S4-2 (FR+) - Body ground	Always	10 kΩ or higher
S1-30 (FR-) or S4-1 (FR- ) - Body ground	Always	10 kΩ or higher

for LH

Tester Connection	Condition	Specified Condition
S1-18 (FL+) - S3-2 (FL+)	Always	Below 1 Ω
S1-17 (FL-) - S3-1 (FL-)	Always	Below 1 Ω
S1-18 (FL+) or S3-2 (FL+) - Body ground	Always	10 kΩ or higher
S1-17 (FL-) or S3-1 (FL-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.	INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR OUTPUT)

(a) Reconnect the S1 skid control ECU (brake actuator assembly) connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

for RH

Tester Connection	Switch Condition	Specified Condition
S4-2 (FR+) - Body ground	Ignition switch ON	8 to 14 V

for LH

Tester Connection	Switch Condition	Specified Condition
S3-2 (FL+) - Body ground	Ignition switch ON	8 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Front Speed Sensor)
*b	for RH
*c	for LH

OK

REPLACE FRONT SPEED SENSOR

NG

REPLACE BRAKE ACTUATOR ASSEMBLY