Toyota 4Runner manuals

Toyota 4Runner: Open or Short in Front Speed Sensor RH Circuit (C1405,C1406)

DESCRIPTION

Refer to DTCs C1401 and C1402 (See page ).


DTC Code

DTC Detection Condition

Trouble Area

C1405

C1406

Either condition is met:

  1. An open in the speed sensor signal circuit continues for 0.5 seconds or more.
  2. With the IG1 terminal voltage at 9.5 V or higher, the sensor power supply voltage decreases for 0.5 seconds or more.
  • Front speed sensor RH/LH
  • Skid control sensor wire
  • Speed sensor circuit
  • Master cylinder solenoid (Skid control ECU)

HINT:

  • DTC C1405 is for the front speed sensor RH.
  • DTC C1406 is for the front speed sensor LH.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the master cylinder solenoid, perform calibration (See page ).

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

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

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FR Speed Open

Front speed sensor RH open detection/ Error or Normal

Normal

-

FL Speed Open

Front speed sensor LH open detection/ Error or Normal

Normal

-

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)



NG

GO TO STEP 4

OK

3.

RECONFIRM DTC

(a) Clear the DTCs (See page ).


(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

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 MASTER CYLINDER SOLENOID

4.

INSPECT SKID CONTROL SENSOR WIRE

(a) Remove the skid control sensor wire (See page ).


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

Standard Resistance:

for RH

Tester Connection

Condition

Specified Condition

Az2-1 - z5-1 (FR-)

Always

Below 1 Ω

Az2-2 - z5-2 (FR+)

Always

Below 1 Ω

Az2-1 - Az2-2

Always

10 kΩ or higher

for LH

Tester Connection

Condition

Specified Condition

Az3-1 - z6-1 (FL-)

Always

Below 1 Ω

Az3-2 - z6-2 (FL+)

Always

Below 1 Ω

Az3-1 - Az3-2

Always

10 kΩ or higher

Text in Illustration

*A

for RH

*B

for LH

*1

Skid Control Sensor Wire



NG

REPLACE SKID CONTROL SENSOR WIRE

OK

5.

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

(a) Install the skid control sensor wire.

(b) Disconnect the A6 skid control ECU connector.

(c) Disconnect the z5 and/or z6 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

A6-3 (FR+) - z5-2 (FR+)

Always

Below 1 Ω

A6-3 (FR+) - Body ground

Always

10 kΩ or higher

A6-17 (FR-) - z5-1 (FR-)

Always

Below 1 Ω

A6-17 (FR-) - Body ground

Always

10 kΩ or higher

for LH

Tester Connection

Condition

Specified Condition

A6-18 (FL+) - z6-2 (FL+)

Always

Below 1 Ω

A6-18 (FL+) - Body ground

Always

10 kΩ or higher

A6-4 (FL-) - z6-1 (FL-)

Always

Below 1 Ω

A6-4 (FL-) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK TERMINAL VOLTAGE (FR+, FL+)

(a) Disconnect the z5 and/or z6 front speed sensor connector.

(b) Connect the A6 skid control ECU connector.

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

Standard Voltage:

for RH

Tester Connection

Switch Condition

Specified Condition

z5-2 (FR+) - Body ground

Ignition switch ON

11 to 14 V

for LH

Tester Connection

Switch Condition

Specified Condition

z6-2 (FL+) - Body ground

Ignition switch ON

11 to 14 V

Text in Illustration

*A

for RH

*B

for LH

*a

Front view of wire harness connector

(to Front Speed Sensor)



OK

REPLACE FRONT SPEED SENSOR


NG

REPLACE MASTER CYLINDER SOLENOID

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