Toyota Tacoma 2015-2018 Service Manual: Open or Short in Front Speed Sensor RH Circuit (C1405,C1406)

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Open or Short in Front Speed Sensor RH Circuit (C1405,C1406)

DESCRIPTION

Refer to DTCs C1401 and C1402 (See page ).

DTC Code	DTC Detection Condition	Trouble Area
C1405 C1406	Either condition is met: An open in the speed sensor signal circuit continues for 0.5 seconds or more. With the IG1 terminal voltage at 9.5 V or higher, the sensor power supply voltage decreases for 0.5 seconds or more.	Front speed sensor RH/LH Skid control sensor wire Speed sensor circuit Skid control ECU (master cylinder solenoid)

DTC Code

DTC Detection Condition

Trouble Area

C1405

C1406

Either condition is met:

An open in the speed sensor signal circuit continues for 0.5 seconds or more.
With the IG1 terminal voltage at 9.5 V or higher, the sensor power supply voltage decreases for 0.5 seconds or more.

Front speed sensor RH/LH
Skid control sensor wire
Speed sensor circuit
Skid control ECU (master cylinder solenoid)

HINT:

DTC C1405 is for the front speed sensor RH.
DTC C1406 is for the front speed sensor LH.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (master cylinder solenoid), perform calibration (See page ).
Check the speed sensor signal after replacement (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/ Error or Normal	Normal	-
FL Speed Open	Front speed sensor LH open detection/ Error or Normal	Normal	-

OK:

Normal (there are no momentary interruptions).

HINT:

Perform the above inspection before removing the sensor and connector.

GO TO STEP 4

2.	READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

GO TO STEP 4

3.	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 C1405 and C1406 are not output	A
DTCs C1405 and/or C1406 are output	B

USE SIMULATION METHOD TO CHECK

REPLACE MASTER CYLINDER SOLENOID

4.	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:

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

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

Text in Illustration

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

REPLACE SKID CONTROL SENSOR WIRE

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

(a) Install the skid control sensor wire.

(b) Disconnect the S1 skid control ECU (master cylinder solenoid) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
S1-3 (FR+) - S4-2 (FR+)	Always	Below 1 Ω
S1-3 (FR+) - Body ground	Always	10 kΩ or higher
S1-17 (FR-) - S4-1 (FR-)	Always	Below 1 Ω
S1-17 (FR-) - Body ground	Always	10 kΩ or higher

Tester Connection	Condition	Specified Condition
S1-18 (FL+) - S3-2 (FL+)	Always	Below 1 Ω
S1-18 (FL+) - Body ground	Always	10 kΩ or higher
S1-4 (FL-) - S3-1 (FL-)	Always	Below 1 Ω
S1-4 (FL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the S4 and/or S3 front speed sensor connector.

(b) Connect the S1 skid control ECU (master cylinder solenoid) connector.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
S4-2 (FR+) - Body ground	Ignition switch ON	11 to 14 V

Tester Connection	Switch Condition	Specified Condition
S3-2 (FL+) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

Front view of wire harness connector

(to Front Speed Sensor)

REPLACE FRONT SPEED SENSOR

REPLACE MASTER CYLINDER SOLENOID

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