Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018KEI
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1407,C1408; Open or Short in Rear Speed Sensor RH Circuit; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

C1407

Open or Short in Rear Speed Sensor RH Circuit

DTC

C1408

Open or Short in Rear Speed Sensor LH Circuit

DESCRIPTION

Refer to DTCs C1403 and C1404 (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1403,C1404; Rear Speed Sensor RH Malfunction ).

DTC Code

DTC Detection Condition

Trouble Area

C1407

C1408

Either of the following is detected:

  1. An open in the speed sensor signal circuit continues for 0.5 seconds or more.
  2. With the +BS terminal voltage 9.5 V or higher, the sensor power supply voltage decreases for 0.5 seconds or more.
  • Rear speed sensor RH/LH
  • Speed sensor circuit
  • Skid control ECU (Brake actuator assembly)

HINT:

  • DTC C1407 is for the rear speed sensor RH.
  • DTC C1408 is for the rear speed sensor LH.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION ).

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 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CHECK FOR INTERMITTENT PROBLEMS ).

ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

RR Speed Open

Rear speed sensor RH open detection / Error or Normal

Error: Momentary interruption

Normal: Normal

-

RL Speed Open

Rear speed sensor LH open detection / Error or Normal

Error: Momentary interruption

Normal: Normal

-

Result

Result

Proceed to

There are no momentary interruptions

A

There are momentary interruptions

B

HINT:

Perform the above inspection before removing the sensor and connector.

B

GO TO STEP 4

A

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) Select the Data List using the Techstream (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DATA LIST / ACTIVE TEST ).

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 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

(g) Check the speed value output from the speed sensor displayed on the Techstream.

HINT:

Factors that affect the indicated vehicle speed include tire size, tire pressure, 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 2018 - 2020 MY Sienna [11/2017 -        ]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: ON-VEHICLE INSPECTION ).

OK:

The speed value output from the speed sensor displayed on the Techstream is similar to the speed indicated on the speedometer.

NG

GO TO STEP 4

OK

3.

RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTCs (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR ).

(c) Turn the ignition switch off.

(d) Start the engine.

(e) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

(f) Check if the same DTC is output (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR ).

Result

Proceed to

DTCs C1407 and C1408 are not output.

A

DTCs C1407 and/or C1408 are output.

B

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE ).

A

CHECK FOR INTERMITTENT PROBLEMS

B

REPLACE BRAKE ACTUATOR ASSEMBLY

4.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL SENSOR WIRE)

(a) for 2WD

(1) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(2) Disconnect the skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

for RH

Tester Connection

Condition

Specified Condition

A75-16 (RR+) - k1-2 (RR+)

Always

Below 1 Ω

A75-16 (RR+) - Body ground

Always

10 kΩ or higher

A75-15(RR-) - k1-1 (RR-)

Always

Below 1 Ω

A75-15 (RR-) - Body ground

Always

10 kΩ or higher

for LH

Tester Connection

Condition

Specified Condition

A75-29 (RL+) - n1-2 (RL+)

Always

Below 1 Ω

A75-29 (RL+) - Body ground

Always

10 kΩ or higher

A75-28 (RL-) - n1-1 (RL-)

Always

Below 1 Ω

A75-28 (RL-) - Body ground

Always

10 kΩ or higher

(b) for AWD

(1) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(2) Disconnect the skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

for RH

Tester Connection

Condition

Specified Condition

A75-16 (RR+) - L41-1 (RR+)

Always

Below 1 Ω

A75-16 (RR+) - Body ground

Always

10 kΩ or higher

A75-15 (RR-) - L41-2 (RR-)

Always

Below 1 Ω

A75-15 (RR-) - Body ground

Always

10 kΩ or higher

for LH

Tester Connection

Condition

Specified Condition

A75-29 (RL+) - K30-1 (RL+)

Always

Below 1 Ω

A75-29 (RL+) - Body ground

Always

10 kΩ or higher

A75-28 (RL-) - K30-2 (RL-)

Always

Below 1 Ω

A75-28 (RL-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT SKID CONTROL ECU (SENSOR INPUT)

(a) for 2WD

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

(2) Turn the ignition switch to ON.

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

Standard Voltage:

for RH

Tester Connection

Switch Condition

Specified Condition

k1-2 (RR+) - Body ground

Ignition switch ON

8 to 14 V

for LH

Tester Connection

Switch Condition

Specified Condition

n1-2 (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 AWD

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

(2) Turn the ignition switch to ON.

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

Standard Voltage:

for RH

Tester Connection

Switch Condition

Specified Condition

L41-1 (RR+) - Body ground

Ignition switch ON

8 to 14 V

for LH

Tester Connection

Switch Condition

Specified Condition

K30-1 (RL+) - Body ground

Ignition switch ON

8 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Rear Speed Sensor)

Result

Result

Proceed to

OK (for 2WD)

A

OK (for AWD)

B

NG

C

NOTICE:

Check the speed sensor signal after replacement (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: TEST MODE PROCEDURE )

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (See page 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE ).

A

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

B

REPLACE REAR SPEED SENSOR

C

REPLACE BRAKE ACTUATOR ASSEMBLY