Toyota Tacoma Quiz
Brake Control / Dynamic Control Systems

Open or Short in Rear Speed Sensor RH Circuit (C1407,C1408)

In this manual: Brake Control / Dynamic Control Systems
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2steps
~12min
1/5difficulty
Done 0 of 2
DESCRIPTION

Refer to DTCs C1401 and C1402 (See page ).

DTC Code

DTC Detection Condition

Trouble Area

C1407

C1408

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.
  • Rear speed sensor RH/LH
  • Skid control sensor wire
  • Speed sensor circuit
  • Skid control ECU (master cylinder solenoid)

HINT:

  • DTC C1407 is for the rear speed sensor RH.
  • DTC C1408 is for the rear speed sensor LH.
WIRING DIAGRAM 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 replacement (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

RR Speed Open

Rear speed sensor RH open detection/ Error or Normal

Normal

-

RL Speed Open

Rear 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

  1. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

NG

GO TO STEP 4
OK

  1. 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 or more for at least 60 seconds.

(e) Check if the same DTC is output (See page ). Result ).

Result

Result

Proceed to

DTCs C1407 and C1408 are not output

A

DTCs C1407 and/or C1408 are output

B
A

USE SIMULATION METHOD TO CHECK
B

REPLACE MASTER CYLINDER SOLENOID

  1. INSPECT SKID CONTROL SENSOR WIRE

Text in Illustration

*1

Skid Control Sensor Wire

-

-

*a

RH

*b

LH

(a) Remove the skid control sensor wire.

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

Standard Resistance:

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
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

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

(a) Install the skid control sensor wire.

(b) Disconnect the S1 skid control ECU (master cylinder solenoid) connector.

(c) Disconnect the Xa1 and/or Xa2 rear speed sensor connector.

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

Standard Resistance:

RH

Tester Connection

Condition

Specified Condition

S1-5 (RR+) - Xa1-2 (RR+)

Always

Below 1 Ω

S1-5 (RR+) - Body ground

Always

10 kΩ or higher

S1-19 (RR-) - Xa1-1 (RR-)

Always

Below 1 Ω

S1-19 (RR-) - Body ground

Always

10 kΩ or higher
LH

Tester Connection

Condition

Specified Condition

S1-20 (RL+) - Xa2-2 (RL+)

Always

Below 1 Ω

S1-20 (RL+) - Body ground

Always

10 kΩ or higher

S1-6 (RL-) - Xa2-1 (RL-)

Always

Below 1 Ω

S1-6 (RL-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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

(a) Disconnect the Xa1 and/or Xa2 rear speed sensor connector.

(b) Connect the S1 skid control ECU (master cylinder solenoid) connector.

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

Standard Voltage:

RH

Tester Connection

Switch Condition

Specified Condition

Xa1-2 (RR+) - Body ground

Ignition switch ON

11 to 14 V
LH

Tester Connection

Switch Condition

Specified Condition

Xa2-2 (RL+) - Body ground

Ignition switch ON

11 to 14 V
Text in Illustration

*a

Front view of wire harness connector

(to Rear Speed Sensor)

*b

RH

*c

LH
OK

REPLACE REAR SPEED SENSOR
NG

REPLACE MASTER CYLINDER SOLENOID

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