Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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 ).

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.)

NG

GO TO STEP 4

OK

2.

READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(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

(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 ).

NG

GO TO STEP 4

OK

3.

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) 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

A

USE SIMULATION METHOD TO CHECK

B

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

NG

INSTALL REAR SPEED SENSOR CORRECTLY

OK

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 ).
NG

CLEAN OR REPLACE REAR SPEED SENSOR

OK

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.

(c) Reinstall the rear speed sensor and 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

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. ).

(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

NG

REPLACE SKID CONTROL SENSOR WIRE

OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

INSPECT BRAKE ACTUATOR (SENSOR INPUT)

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

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

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

*a

Front view of wire harness connector

(to Rear Speed Sensor)

*b

for RH

*c

for LH

NOTICE:

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

OK

REPLACE REAR SPEED SENSOR

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

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