Toyota Tacoma (2015-2018) Service Manual: Rear Speed Sensor RH Output Malfunction (C1415,C1416)

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Rear Speed Sensor RH Output Malfunction (C1415,C1416)

DESCRIPTION

Refer to DTCs C1403 and C1404 (See page ).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1415	Rear 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.	Rear speed sensor RH Rear skid control rotor LH (rear axle hub and bearing assembly LH) Sensor installation Skid control ECU (Brake actuator assembly) Wire harness or connector
C1416	Rear 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.	Rear speed sensor LH Rear skid control rotor RH (rear axle hub and bearing assembly RH) 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 C1407 and C1408 (See page CAUTION / NOTICE / HINT ).

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	Range	Normal Condition	Diagnostic Note
RR Speed Open	Rear speed sensor RH open detection	Normal or Error	Normal	Error: Momentary interruption
RL Speed Open	Rear speed sensor LH open detection	Normal or Error	Normal	Error: Momentary interruption

HINT:

Perform the above inspection before removing the sensor and connector.

OK:

Normal (There are no momentary interruptions.)

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	Range	Normal Condition	Diagnostic Note
RR Wheel Speed	Rear 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
RL Wheel Speed	Rear 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

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RR Wheel Speed

Rear 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

RL Wheel Speed

Rear 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: 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 C1415 and C1416 are not output	A
DTCs C1415 and/or C1416 are output	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

4.	CHECK REAR SPEED SENSOR INSTALLATION

(a) Turn the ignition switch off.

(b) Check the rear speed sensor installation (See page OK: OK: ).

OK:

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

The installation bolt is tightened properly.

Text in Illustration

*a	Normal
*b	Abnormal
*c	Clearance

INSTALL REAR SPEED SENSOR CORRECTLY

5.	INSPECT REAR SPEED SENSOR TIP

(a) Remove the rear speed sensor (See page (b) Check the speed sensor tip. ).

(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.
If there is iron powder sticking to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign material before replacing the sensor.
Check the speed sensor signal after cleaning or replacement (See page ).

CLEAN OR REPLACE REAR SPEED SENSOR

6.	INSPECT REAR AXLE SHAFT BEARING

(a) Remove the rear axle shaft bearing (See page (b) Check the rear skid control rotor. ).

(b) Check the rear 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 ).

HINT:

The rear skid control rotor is incorporated into the rear axle shaft bearing.
If the rear skid control rotor needs to be replaced, replace it together with the rear axle shaft bearing.

for the rear speed sensor: (See page )
for the rear axle shaft bearing: (See page )

CLEAN OR REPLACE REAR AXLE SHAFT BEARING

7.	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

8.	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

9.	INSPECT BRAKE ACTUATOR (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

Front view of wire harness connector

(to Rear Speed Sensor)

for RH

for LH

NOTICE:

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

REPLACE REAR SPEED SENSOR

REPLACE BRAKE ACTUATOR ASSEMBLY

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