Toyota Tacoma 2015-2018 Service Manual: Open or Short in Rear Speed Sensor RH Circuit (C1407,C1408)

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Open or Short in Rear Speed Sensor RH Circuit (C1407,C1408)

DESCRIPTION

Refer to DTCs C1403 and C1404 (See page ).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1407	Open or Short in Rear Speed Sensor RH Circuit	Either of the following is detected: An open in the speed sensor signal circuit continues for 0.5 seconds or more. With the +BS terminal voltage at 9.5 V or higher, the sensor power supply voltage decreases for 0.5 seconds or more.	Rear speed sensor RH Wire harness or connector Skid control ECU (Brake actuator assembly)
C1408	Open or Short in Rear Speed Sensor LH Circuit	Either of the following is detected: An open in the speed sensor signal circuit continues for 0.5 seconds or more. With the +BS terminal voltage at 9.5 V or higher, the sensor power supply voltage decreases for 0.5 seconds or more.	Rear speed sensor LH Wire harness or connector Skid control ECU (Brake actuator assembly)

HINT:

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

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 ).

ABS/VSC/TRAC

Tester Display	Measurement Item	Normal Condition	Diagnostic Note
RR Speed Open	Rear speed sensor RH open circuit detection/ Error or Normal	Normal	Error: Momentary interruption
RL Speed Open	Rear speed sensor LH open circuit detection/ Error or Normal	Normal	Error: Momentary interruption

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 (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.

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

ABS/VSC/TRAC

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

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).

NOTICE:

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

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 ).

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) Perform a road test.

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

Result

Result	Proceed to
DTCs C1407 and C1408 are not output	A
DTCs C1407 and/or C1408 are output	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

4.	INSPECT SKID CONTROL SENSOR WIRE

Text in Illustration

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

(a) Remove the skid control sensor wire (See page (b) Measure the resistance according to the value(s) in the table below. ).

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

Standard Resistance:

for RH

Tester Connection	Condition	Specified Condition
S22-4 - Xa1-2 (RR+)	Always	Below 1 Ω
S22-3 - Xa1-1 (RR-)	Always	Below 1 Ω
S22-4 - S22-3	Always	10 kΩ or higher
S22-4 - S22-1	Always	10 kΩ or higher
S22-4 - S22-2	Always	10 kΩ or higher

for LH

Tester Connection	Condition	Specified Condition
S22-2 - Xa2-2 (RL+)	Always	Below 1 Ω
S22-1 - Xa2-1 (RL-)	Always	Below 1 Ω
S22-2 - S22-1	Always	10 kΩ or higher
S22-2 - S22-3	Always	10 kΩ or higher
S22-2 - S22-4	Always	10 kΩ or higher

REPLACE SKID CONTROL SENSOR WIRE

5.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR 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 O3 and/or O4 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
S1-16 (RR+) - Xa1-2 (RR+)	Always	Below 1 Ω
S1-15 (RR-) - Xa1-1 (RR-)	Always	Below 1 Ω
S1-16 (RR+) or Xa1-2 (RR+) - Body ground	Always	10 kΩ or higher
S1-15 (RR-) or Xa1-1 (RR-) - Body ground	Always	10 kΩ or higher

for LH

Tester Connection	Condition	Specified Condition
S1-29 (RL+) - Xa2-2 (RL+)	Always	Below 1 Ω
S1-28 (RL-) - Xa2-1 (RL-)	Always	Below 1 Ω
S1-29 (RL+) or Xa2-2 (RL+) - Body ground	Always	10 kΩ or higher
S1-28 (RL-) or Xa2-1 (RL- ) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)

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

(b) Turn the ignition switch to ON.

Standard Voltage:

for RH

Tester Connection	Switch Condition	Specified Condition
Xa1-2 (RR+) - Body ground	Ignition switch ON	8 to 14 V

for LH

Tester Connection	Switch Condition	Specified Condition
Xa2-2 (RL+) - Body ground	Ignition switch ON	8 to 14 V

Text in Illustration

for RH

for LH

Front view of wire harness connector

(to Rear Speed Sensor)

NOTICE:

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

REPLACE REAR SPEED SENSOR

REPLACE BRAKE ACTUATOR ASSEMBLY

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