DTC C1273: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1466: Rear Speed Sensor RH Circuit; DTC C1467: Rear Speed Sensor LH Circuit [08/2020 - 12/2021]: Procedure

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

Refer to CHECK FOR INTERMITTENT PROBLEMS [02/2019 - 12/2021]

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
RR Speed Open	Rear speed sensor RH open detection	Error or Normal	Normal: Momentary interruption not detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".
RL Speed Open	Rear speed sensor LH open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".

Chassis > ABS/VSC/TRAC > Data List

Tester Display
RR Speed Open
RL Speed Open

Normal (There are no momentary interruptions.)

HINT:

Perform the above inspection before removing the sensor and connector.

Result

Proceed to
OK
NG

Result:

See step 5

Result:

See step 2

READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

Select the Data List on the Techstream.

Refer to DATA LIST / ACTIVE TEST [02/2019 - 12/2021]

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
RR Wheel Speed	Rear speed sensor RH	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 speed sensor LH	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

Chassis > ABS/VSC/TRAC > Data List

Tester Display
RR Wheel Speed
RL Wheel Speed

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 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.

Refer to OPERATION CHECK [11/2018 - 12/2021]

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

Result

Proceed to
OK
NG

Result:

See step 5

Result:

See step 3

PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

Turn the ignition switch off.

Perform the sensor check in Test Mode Procedure.

Refer to TEST MODE PROCEDURE [08/2020 - 12/2021]

Chassis > ABS/VSC/TRAC > Utility

Tester Display
Signal Check

All Test Mode DTCs are cleared.

Result

Proceed to
OK
NG

Result:

See step 5

Result:

See step 4

RECONFIRM DTC

Turn the ignition switch off.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [02/2019 - 12/2021]

Chassis > ABS/VSC/TRAC > Clear DTCs
Turn the ignition switch ON (READY).
Perform a road test.

Check if the same DTC is output.

Refer to DTC CHECK / CLEAR [02/2019 - 12/2021]

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Result	Proceed to
DTCs C1466 and C1467 are not output.	A
DTCs C1466 and/or C1467 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.

Refer to PROBLEM SYMPTOMS TABLE [11/2018 - 12/2021]

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

Result:

See step 7

CHECK REAR SPEED SENSOR INSTALLATION

Turn the ignition switch off.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	No clearance
*b	OK
*c	NG

Check the speed sensor installation.

Refer to INSTALLATION [02/2019 - ]

There is no clearance between the sensor and the rear steering knuckle.

The installation bolt is tightened properly.

Result

Proceed to
OK
NG

Result:

INSTALL REAR SPEED SENSOR CORRECTLY. Refer to INSTALLATION [02/2019 - ]

Result:

See step 6

CHECK REAR SPEED SENSOR AND SENSOR ROTOR

Remove the rear speed sensor and the component with the speed sensor rotor.
for Speed Sensor: Refer to REMOVAL [11/2018 - ]

for Speed Sensor Rotor: Refer to REMOVAL [08/2020 - 12/2021]

Check the speed sensor tip and speed sensor rotor.

The sensor tip and rotor are free of scratches, oil, and foreign matter.

NOTE:

If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.
If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.
Check the speed sensor signal after cleaning or replacement.
Refer to TEST MODE PROCEDURE [08/2020 - 12/2021]

Result

Proceed to
OK
NG

Result:

CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

Result:

See step 7

INSPECT PARKING BRAKE WIRE ASSEMBLY

Make sure that there is no looseness at the locking part and the connecting part of the connectors.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*A	for RH
*B	for LH
*1	Skid Control Sensor Wire (Parking Brake Wire Assembly)
*a	Front view of wire harness connector (to Sensor Side Connector)
*b	Front view of wire harness connector (to Vehicle Side Connector)

Disconnect the M50 or N58 skid control sensor wire (parking brake wire assembly) connector.
Disconnect the MM3 or NN6 skid control sensor wire (parking brake wire assembly) connector.

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

Standard Resistance

FOR RH

Tester Connection	Condition	Specified Condition
M50-2 (RA+) - MM3-3	Always	Below 1 Ω
M50-2 (RA+) or MM3-3 - Body ground and other terminals	Always	10 kΩ or higher
M50-1 (RA-) - MM3-4	Always	Below 1 Ω
M50-1 (RA-) or MM3-4 - Body ground and other terminals	Always	10 kΩ or higher

FOR LH

Tester Connection	Condition	Specified Condition
N58-2 (LA+) - NN6-3	Always	Below 1 Ω
N58-2 (LA+) or NN6-3 - Body ground and other terminals	Always	10 kΩ or higher
N58-1 (LA-) - NN6-4	Always	Below 1 Ω
N58-1 (LA-) or NN6-4 - Body ground and other terminals	Always	10 kΩ or higher

NOTE:

Check the speed sensor signal after replacement.

Refer to TEST MODE PROCEDURE [08/2020 - 12/2021]

Result

Proceed to
OK
NG

Result:

REPLACE PARKING BRAKE WIRE ASSEMBLY

Result:

See step 8

CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR SPEED SENSOR)

Make sure that there is no looseness at the locking part and the connecting part of the connector.
Reconnect the MM3 or NN6 skid control sensor wire (parking brake wire assembly) connector.
Disconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.

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

Standard Resistance

FOR RH

Tester Connection	Condition	Specified Condition
A42-22 (RR+) - M50-2 (RA+)	Always	Below 1 Ω
A42-22 (RR+) or M50-2 (RA+) - Body ground	Always	10 kΩ or higher
A42-9 (RR-) - M50-1 (RA-)	Always	Below 1 Ω
A42-9 (RR-) or M50-1 (RA-) - Body ground	Always	10 kΩ or higher

FOR LH

Tester Connection	Condition	Specified Condition
A42-20 (RL+) - N58-2 (LA+)	Always	Below 1 Ω
A42-20 (RL+) or N58-2 (LA+) - Body ground	Always	10 kΩ or higher
A42-7 (RL-) - N58-1 (LA-)	Always	Below 1 Ω
A42-7 (RL-) or N58-1 (LA-) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 9

INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

Reconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.

*A	for RH
*B	for LH
*a	Front view of wire harness connector (to Rear Speed Sensor)

Turn the ignition switch to ON.

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

Standard Voltage

FOR RH

Tester Connection	Condition	Specified Condition
M50-2 (RA+) - Body ground	Ignition switch ON	5.7 to 14 V

FOR LH

Tester Connection	Condition	Specified Condition
N58-2 (LA+) - Body ground	Ignition switch ON	5.7 to 14 V

Result

Proceed to
OK
NG

Result:

REPLACE REAR SPEED SENSOR. Refer to REMOVAL [11/2018 - ]

Result:

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to REMOVAL [08/2020 - 12/2021]