Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Rear Speed Sensor RH Malfunction (C1403,C1404)

DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU (brake actuator assembly). These signals are used for brake control.

The speed sensor rotors have rows of alternating N and S magnetic poles and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU (brake actuator assembly).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1403

Rear Speed Sensor RH Malfunction

Any of the following is detected:

  • At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.
  • At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.
  • At a vehicle speed of less than 10 km/h (6 mph), the outputs from both rear speed sensors are 0 km/h (0 mph) for a cumulative time of 200 seconds.
  • Rear speed sensor RH
  • Sensor installation
  • Rear axle hub and bearing assembly RH (rear axle hub and bearing assembly RH)

C1404

Rear Speed Sensor LH Malfunction

Any of the following is detected:

  • At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more.
  • At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.
  • At a vehicle speed of less than 10 km/h (6 mph), the outputs from both rear speed sensors are 0 km/h (0 mph) for a cumulative time of 200 seconds.
  • Rear speed sensor LH
  • Sensor installation
  • Rear axle hub and bearing assembly LH (rear axle hub and bearing assembly LH)

HINT:

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

PROCEDURE

1.

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

NG

INSTALL REAR SPEED SENSOR CORRECTLY

OK

2.

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 ).
NG

CLEAN OR REPLACE REAR SPEED SENSOR

OK

3.

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.

(c) Reinstall the rear axle shaft bearing.

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

CLEAN OR REPLACE REAR AXLE SHAFT BEARING

OK

4.

READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

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

(e) 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

(f) 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 ).

OK

USE SIMULATION METHOD TO CHECK

NG

5.

REPLACE REAR SPEED SENSOR

(a) Turn the ignition switch off.

(b) Replace the rear speed sensor (See page ). NOTICE: ).

NOTICE:

After replacing the speed sensor, perform a Test Mode (signal check) inspection sensor check (See page ). ).

NEXT

6.

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 recorded (See page Result Result ).

Result

Result

Proceed to

DTCs C1403 and C1404 are not output

A

DTCs C1403 and/or C1404 are output

B

NOTICE:

Check the speed sensor signal after 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.
A

END

B

REPLACE REAR AXLE SHAFT BEARING

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