Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC) (C1277,...,C1416)

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 Rear Speed Sensor RH (Test Mode DTC) (C1277,...,C1416)

DESCRIPTION

Refer to DTCs C1401 and C1402 (See page ).

DTC Code

DTC Detection Condition

Trouble Area

C1277

C1278

Stored only during test mode.

  • Rear speed sensor RH/LH
  • Rear speed sensor rotor RH/LH (Rear axle hub and bearing assembly RH/LH)

C1415

C1416

One of the following conditions is met:

  1. An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more.
  2. 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.
  3. 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/LH
  • Skid control sensor wire
  • Speed sensor circuit
  • Rear speed sensor rotor RH/LH (Rear axle hub and bearing assembly RH/LH)
  • Skid control ECU (master cylinder solenoid)

HINT:

  • DTCs C1415 and C1277 are for the rear speed sensor RH.
  • DTCs C1416 and C1278 are for the rear speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1407 and C1408 (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 ).
  • Check the speed sensor signal after cleaning or replacement (See page ).

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

NG

GO TO STEP 9

OK

2.

READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

NG

GO TO STEP 5

OK

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.

NG

GO TO STEP 5

OK

4.

RECONFIRM DTC

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

(b) Turn the ignition switch off.

(c) Start the engine.

(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 C1415 and C1416 are not output

A

DTCs C1415 and/or C1416 are output

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO STEP 12

5.

CHECK REAR SPEED SENSOR INSTALLATION

NG

INSTALL REAR SPEED SENSOR CORRECTLY

OK

6.

INSPECT REAR SPEED SENSOR TIP

NG

CLEAN OR REPLACE REAR SPEED SENSOR

OK

7.

INSPECT REAR SPEED SENSOR ROTOR

NG

CLEAN OR REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

OK

8.

INSPECT SKID CONTROL SENSOR WIRE

NG

REPLACE SKID CONTROL SENSOR WIRE

OK

9.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.

INSPECT SKID CONTROL ECU (RR+, RL+ TERMINAL)

NG

REPLACE MASTER CYLINDER SOLENOID

OK

11.

RECONFIRM DTC

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

(b) Turn the ignition switch off.

(c) Start the engine.

(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 C1415 and C1416 are not output

A

DTCs C1415 and/or C1416 are output

B

A

USE SIMULATION METHOD TO CHECK

B

12.

REPLACE REAR SPEED SENSOR

NEXT

13.

RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTCs (See page ). (c) Start the engine. ).

(c) Start the engine.

(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 C1415 and C1416 are not output

A

DTCs C1415 and/or C1416 are output

B

A

END

B

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

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