Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Open or Short in Front Speed Sensor RH Circuit (C1405,C1406)

DESCRIPTION

Refer to DTCs C1401 and C1402 (See page ).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1405

Open or Short in Front 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.
  • Front speed sensor RH
  • Skid control ECU (Brake actuator assembly)
  • Wire harness or connector

C1406

Open or Short in Front 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.
  • Front speed sensor LH
  • Skid control ECU (Brake actuator assembly)
  • Wire harness or connector

HINT:

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

WIRING DIAGRAM

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

Normal Condition

Diagnostic Note

FR Speed Open

Front speed sensor RH open circuit detection/ Error or Normal

Normal

Error: Momentary interruption

FL Speed Open

Front 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.

NG

GO TO STEP 4

OK

2.

READ VALUE USING TECHSTREAM (FRONT 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

Normal Condition

Diagnostic Note

FR Wheel Speed

Front 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

FL Wheel Speed

Front 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).

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 C1405 and C1406 are not output

A

DTCs C1405 and/or C1406 are output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

4.

INSPECT SKID CONTROL SENSOR WIRE

(a) Remove the skid control sensor wire.

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

Text in Illustration

*1

Skid Control Sensor Wire

-

-

*a

for RH

*b

for LH

Standard Resistance:

for RH

Tester Connection

Condition

Specified Condition

Va1-1 - S4-1 (FR-)

Always

Below 1 Ω

Va1-2 - S4-2 (FR+)

Always

Below 1 Ω

Va1-1 - Va1-2

Always

10 kΩ or higher

for LH

Tester Connection

Condition

Specified Condition

Wa1-1 - S3-1 (FL-)

Always

Below 1 Ω

Wa1-2 - S3-2 (FL+)

Always

Below 1 Ω

Wa1-1 - Wa1-2

Always

10 kΩ or higher

NG

REPLACE SKID CONTROL SENSOR WIRE

OK

5.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT 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 S4 and/or S3 front 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

S1-31 (FR+) - S4-2 (FR+)

Always

Below 1 Ω

S1-30 (FR-) - S4-1 (FR-)

Always

Below 1 Ω

S1-31 (FR+) or S4-2 (FR+) - Body ground

Always

10 kΩ or higher

S1-30 (FR-) or S4-1 (FR-) - Body ground

Always

10 kΩ or higher

for LH

Tester Connection

Condition

Specified Condition

S1-18 (FL+) - S3-2 (FL+)

Always

Below 1 Ω

S1-17 (FL-) - S3-1 (FL-)

Always

Below 1 Ω

S1-18 (FL+) or S3-2 (FL+) - Body ground

Always

10 kΩ or higher

S1-17 (FL-) or S3-1 (FL-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR OUTPUT)

(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

S4-2 (FR+) - Body ground

Ignition switch ON

8 to 14 V

for LH

Tester Connection

Switch Condition

Specified Condition

S3-2 (FL+) - Body ground

Ignition switch ON

8 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Front Speed Sensor)

*b

for RH

*c

for LH

OK

REPLACE FRONT SPEED SENSOR

NG

REPLACE BRAKE ACTUATOR ASSEMBLY

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