DTC C1271: Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272: Low Output Signal of Front Speed Sensor LH (Test Mode DTC); DTC C1464: Front Speed Sensor RH Circuit; DTC C1465: Front Speed Sensor LH Circuit [02/2019 - 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
FR Speed Open	Front speed sensor RH 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".
FL Speed Open	Front 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
FR Speed Open
FL 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 (FRONT 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
FR Wheel Speed	Front 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
FL Wheel Speed	Front 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
FR Wheel Speed
FL 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 [02/2019 - 08/2020] , or 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 to 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 C1464 and C1465 are not output.	A
DTCs C1464 and/or C1465 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 FRONT 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 [11/2018 - ]

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

The installation bolt is tightened properly.

Result

Proceed to
OK
NG

Result:

INSTALL FRONT SPEED SENSOR CORRECTLY. Refer to INSTALLATION [11/2018 - ]

Result:

See step 6

CHECK FRONT SPEED SENSOR AND SENSOR ROTOR

Remove the front 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 [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or 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 [02/2019 - 08/2020] , or 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

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

Install the front speed sensor.
Refer to INSTALLATION [11/2018 - ]
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.
Disconnect the A91 or A92 front speed sensor connector.

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

Standard Resistance

FOR RH

Tester Connection	Condition	Specified Condition
A42-18 (FR+) - A91-1 (FR+)	Always	Below 1 Ω
A42-18 (FR+) or A91-1 (FR+) - Body ground	Always	10 kΩ or higher
A42-5 (FR-) - A91-2 (FR-)	Always	Below 1 Ω
A42-5 (FR-) or A91-2 (FR-) - Body ground	Always	10 kΩ or higher

FOR LH

Tester Connection	Condition	Specified Condition
A42-31 (FL+) - A92-1 (FL+)	Always	Below 1 Ω
A42-31 (FL+) or A92-1 (FL+) - Body ground	Always	10 kΩ or higher
A42-32 (FL-) - A92-2 (FL-)	Always	Below 1 Ω
A42-32 (FL-) or A92-2 (FL-) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 8

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 Front 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
A91-1 (FR+) - Body ground2	Ignition switch ON	5.7 to 14 V

FOR LH

Tester Connection	Condition	Specified Condition
A92-1 (FL+) - Body ground	Ignition switch ON	5.7 to 14 V

Result

Proceed to
OK
NG

Result:

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

Result:

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021]