ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1464, C1465

DTC Code	DTC Name
C1464	Front Speed Sensor RH Circuit
C1465	Front Speed Sensor LH Circuit

DESCRIPTION

for 2WD

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU (brake actuator assembly). These signals are used for brake control.

Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU (brake actuator assembly).

Tech Tips

When the connectors between the speed sensor and skid control ECU (brake actuator assembly) are connected, the following waveform is output.
for AWD

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU (brake actuator assembly). These signals are used for brake control.

Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU (brake actuator assembly).

Tech Tips

When the connectors between the speed sensor and skid control ECU (brake actuator assembly) are connected, the following waveform is output.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1464	Front Speed Sensor RH Circuit	251 252 253 254 255 262	INF Code: 251 At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit. INF Code: 252 A malfunction occurs in 2 or more wheels. INF Code: 253 An open is detected in the speed sensor signal circuit for 0.5 seconds or more. INF Code: 254 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more. INF Code: 255 Frequency of 2.4 kHz or more is input. INF Code: 262 Either of the following is detected: When IG1 voltage is 9.5 V or more, sensor supply voltage drops for 0.5 seconds or more. When IG1 voltage is 9.5 V or more, sensor supply voltage fluctuates for 60 seconds or more.	INF Code: 251, 252, 253, 254 Open or short in speed sensor Improperly installed speed sensor, or abnormal clearance between sensor and rotor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Resistance in speed sensor circuit Front speed sensor RH Skid control ECU assembly INF Code: 255 Open or short in speed sensor Open or short in wire harness Front speed sensor RH Front speed sensor rotor RH (Front axle hub sub-assembly RH) INF Code: 262 Open or short in wire harness Skid control ECU assembly	-
C1465	Front Speed Sensor LH Circuit	264 265 266 267 268 275	INF Code: 264 At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit. INF Code: 265 A malfunction occurs in 2 or more wheels. INF Code: 266 An open is detected in the speed sensor signal circuit for 0.5 seconds or more. INF Code: 267 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more. INF Code: 268 Frequency of 2.4 kHz or more is input. INF Code: 275 Either of the following is detected: When IG1 voltage is 9.5 V or more, sensor supply voltage drops for 0.5 seconds or more. When IG1 voltage is 9.5 V or more, sensor supply voltage fluctuates for 60 seconds or more.	INF Code: 264, 265, 266, 267 Open or short in speed sensor Improperly installed speed sensor, or abnormal clearance between sensor and rotor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Resistance in speed sensor circuit Front speed sensor LH Skid control ECU assembly INF Code: 268 Open or short in speed sensor Open or short in wire harness Front speed sensor LH Front speed sensor rotor LH (Front axle hub sub-assembly LH) INF Code: 275 Open or short in wire harness Skid control ECU assembly	-

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1464

Front Speed Sensor RH Circuit

251

252

253

254

255

262

INF Code: 251

At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit.

INF Code: 252

A malfunction occurs in 2 or more wheels.

INF Code: 253

An open is detected in the speed sensor signal circuit for 0.5 seconds or more.

INF Code: 254

Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.

INF Code: 255

Frequency of 2.4 kHz or more is input.

INF Code: 262

Either of the following is detected:

When IG1 voltage is 9.5 V or more, sensor supply voltage drops for 0.5 seconds or more.
When IG1 voltage is 9.5 V or more, sensor supply voltage fluctuates for 60 seconds or more.

INF Code: 251, 252, 253, 254

Open or short in speed sensor
Improperly installed speed sensor, or abnormal clearance between sensor and rotor
Open or short in wire harness
Improperly connected connector, deformation or corrosion of terminals
Resistance in speed sensor circuit
Front speed sensor RH
Skid control ECU assembly

INF Code: 255

Open or short in speed sensor
Open or short in wire harness
Front speed sensor RH
Front speed sensor rotor RH (Front axle hub sub-assembly RH)

INF Code: 262

Open or short in wire harness
Skid control ECU assembly

C1465

Front Speed Sensor LH Circuit

264

265

266

267

268

275

INF Code: 264

At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit.

INF Code: 265

A malfunction occurs in 2 or more wheels.

INF Code: 266

An open is detected in the speed sensor signal circuit for 0.5 seconds or more.

INF Code: 267

Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more.

INF Code: 268

Frequency of 2.4 kHz or more is input.

INF Code: 275

Either of the following is detected:

When IG1 voltage is 9.5 V or more, sensor supply voltage drops for 0.5 seconds or more.
When IG1 voltage is 9.5 V or more, sensor supply voltage fluctuates for 60 seconds or more.

INF Code: 264, 265, 266, 267

Open or short in speed sensor
Improperly installed speed sensor, or abnormal clearance between sensor and rotor
Open or short in wire harness
Improperly connected connector, deformation or corrosion of terminals
Resistance in speed sensor circuit
Front speed sensor LH
Skid control ECU assembly

INF Code: 268

Open or short in speed sensor
Open or short in wire harness
Front speed sensor LH
Front speed sensor rotor LH (Front axle hub sub-assembly LH)

INF Code: 275

Open or short in wire harness
Skid control ECU assembly

Tech Tips

DTC C1464 is for the front speed sensor RH.
DTC C1465 is for the front speed sensor LH.

DTC Detection Conditions: C1464 INF Code: 262
		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	IG1 terminal voltage is 9.5 V or more	○	○
Malfunction Status	The sensor power supply voltage is low	○	-
Malfunction Status	The sensor power supply voltage is unstable	-	○
Detection Time		0.5 seconds or more	60 seconds or more
Number of Trips		1 trip	1 trip

DTC Detection Conditions: C1465 INF Code: 275
		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	IG1 terminal voltage is 9.5 V or more	○	○
Malfunction Status	The sensor power supply voltage is low	○	-
Malfunction Status	The sensor power supply voltage is unstable	-	○
Detection Time		0.5 seconds or more	60 seconds or more
Number of Trips		1 trip	1 trip

WIRING DIAGRAM

for AWD
*a	Front Speed Sensor RH
*b	Front Speed Sensor LH
*c	Skid Control ECU Assembly

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU assembly, perform initialization and calibration of the linear solenoid valve.

Click here

PROCEDURE

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

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

Click here

Chassis > ABS/VSC/TRC > 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 Normal: Normal	-
FL Speed Open	Front speed sensor LH open detection	Error or Normal	Error: Momentary interruption Normal: Normal	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Speed Open

Front speed sensor RH open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

FL Speed Open

Front speed sensor LH open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

Chassis > ABS/VSC/TRC > Data List

Tester Display
FR Speed Open
FL Speed Open

OK
There are no momentary interruptions.

Tech Tips

Perform the above inspection before removing the sensor and connector.

Result

Proceed to
OK
NG (for 2WD)
NG (for AWD)

NG (for 2WD)

CHECK FRONT SPEED SENSOR INSTALLATION Click here

NG (for AWD)

CHECK FRONT SPEED SENSOR INSTALLATION Click here

READ VALUE USING GTS (FRONT SPEED SENSOR)

Select the Data List on the GTS.

Click here

Chassis > ABS/VSC/TRC > 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/TRC > Data List

Tester Display
FR Wheel Speed
FL Wheel Speed

Check the speed value output from the speed sensor displayed on the GTS.

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

Result

Proceed to
OK
NG

GO TO STEP 5 Click here

PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

Turn the power switch off.

Using the GTS, perform a Test Mode (signal check) inspection sensor check and check that all Test Mode (signal check) inspection items change from incomplete to complete.

Click here

Chassis > ABS/VSC/TRC > Utility

Tester Display
Signal Check

OK
All Test Mode (signal check) inspection items change from incomplete to complete.

Result

Proceed to
OK
NG

GO TO STEP 5 Click here

RECONFIRM DTC

Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs
Turn the power switch off.
Turn the power switch on (READY).
Perform a road test.

Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRC > Trouble Codes

Result

Result	Proceed to
DTCs C1464 and C1465 are not output.	A
DTCs C1464 and/or C1465 are output.	B

USE SIMULATION METHOD TO CHECK Click here

GO TO STEP 8 Click here

CHECK FRONT SPEED SENSOR INSTALLATION

*1	Front Speed Sensor
*a	OK
*b	NG

Turn the power switch off.

Check the speed sensor installation.

OK
There is no clearance between the sensor and the front axle hub sub-assembly.

Tech Tips

Because the rear front axle hub sub-assembly cannot be disassembled, if the front speed sensor needs replacement, replace the front axle hub sub-assembly.

Result

Proceed to
OK
NG

REPLACE FRONT AXLE HUB SUB-ASSEMBLY Click here

INSPECT FRONT SKID CONTROL SENSOR WIRE

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

Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Remove the front skid control sensor wire.

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

Standard Resistance

for RH
Tester Connection	Condition	Specified Condition
z21 -1 (FR+) - A25 -5 (FR+)	Always	Below 1 Ω
z21 -1 (FR+) or A25 -5 (FR+) - Body ground and other terminals	Always	10 MΩ or higher
z21 -2 (FR-) - A25 -1 (FR-)	Always	Below 1 Ω
z21 -2 (FR-) or A25 -1 (FR-) - Body ground and other terminals	Always	10 MΩ or higher

for LH
Tester Connection	Condition	Specified Condition
A16 -2 (FL+) - AA3 -3	Always	Below 1 Ω
A16 -2 (FL+) or AA3 -3 - Body ground and other terminals	Always	10 MΩ or higher
A16 -1 (FL-) - AA3 -1	Always	Below 1 Ω
A16 -1 (FL-) or AA3 -1 - Body ground and other terminals	Always	10 MΩ or higher

Note

Check the speed sensor signal after replacement.

Click here

Result

Proceed to
OK
NG

REPLACE FRONT SKID CONTROL SENSOR WIRE Click here

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

Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the A10 and A12 skid control ECU assembly connectors.

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

Standard Resistance

for RH
Tester Connection	Condition	Specified Condition
A10-22 (FR+) - A25-5 (FR+)	Always	Below 1 Ω
A10-22 (FR+) or A25-5 (FR+) - Body ground	Always	10 MΩ or higher
A10-23 (FR-) - A25-1 (FR-)	Always	Below 1 Ω
A10-23 (FR-) or A25-1 (FR-) - Body ground	Always	10 MΩ or higher

for LH
Tester Connection	Condition	Specified Condition
A12-31 (FL+) - AA3 -3	Always	Below 1 Ω
A12-31 (FL+) or AA3 -3 - Body ground	Always	10 MΩ or higher
A12-32 (FL-) - AA3 -1	Always	Below 1 Ω
A12-32 (FL-) or AA3 -1 - Body ground	Always	10 MΩ or higher

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK SPEED SENSOR AND SENSOR ROTOR SERRATIONS

Component with harness connected

(Skid Control ECU Assembly)

Normal Signal Waveform

Reconnect the A10 and A12 skid control ECU assembly connectors.

Install the front skid control sensor wire.
Connect an oscilloscope to the front speed sensor terminal of the skid control ECU assembly and body ground.

Check the waveform output when the wheels are rotated.

OK
The same waveform is output from all the sensors and there is no noise or interference in the waveform.

Note

Check the speed sensor signal after cleaning or replacement.

Click here

Tech Tips

As the vehicle speed (wheel revolution speed) increases, the waveform cycle narrows.
When noise is identified in the waveform on the oscilloscope, the erratic signals are likely due to speed sensor rotor scratches, looseness or attached foreign matter.
The front speed sensor and front speed sensor rotor is incorporated into the front axle hub sub-assembly.

If the front speed sensor and front speed sensor rotor needs to be replaced, replace the front axle hub sub-assembly.

Result

Proceed to
OK
NG

REPLACE FRONT SKID CONTROL SENSOR WIRE Click here

RECONFIRM DTC

Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs
Turn the power switch off.
Turn the power switch on (READY).
Perform a road test.

Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRC > Trouble Codes

Result

Result	Proceed to
DTCs C1464 and/or C1465 are output.	A
DTCs C1464 and C1465 are not output.	B

REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

USE SIMULATION METHOD TO CHECK Click here

CHECK FRONT SPEED SENSOR INSTALLATION

*1	Front Speed Sensor
*a	OK
*b	NG

Turn the power switch off.

Check the speed sensor installation.

OK
There is no clearance between the sensor and rear axle carrier.
The installation bolt is tightened properly.

Torque:: 8.5 N*m { 87 kgf*cm, 75 in.*lbf }

Result

Proceed to
A
B

INSTALL FRONT SPEED SENSOR CORRECTLY Click here

CHECK FRONT SPEED SENSOR AND SENSOR ROTOR

Remove the front speed sensor and the component with the speed sensor rotor.

for Speed Sensor: Click here

for Speed Sensor Rotor: Click here

Check the speed sensor tip and speed sensor rotor.

OK
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.

Click here

Result

Proceed to
OK
NG

CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

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

Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the A10 and A12 skid control ECU assembly connectors.

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

Standard Resistance

for RH
Tester Connection	Condition	Specified Condition
A10-22 (FR+) - A73-5 (FR+)	Always	Below 1 Ω
A10-22 (FR+) or A73-5 (FR+) - Body ground	Always	10 MΩ or higher
A10-23 (FR-) - A73-1 (FR-)	Always	Below 1 Ω
A10-23 (FR-) or A73-1 (FR-) - Body ground	Always	10 MΩ or higher

for LH
Tester Connection	Condition	Specified Condition
A12-31 (FL+) - A72-3 (FL+)	Always	Below 1 Ω
A12-31 (FL+) or A72-3 (FL+) - Body ground	Always	10 MΩ or higher
A12-32 (FL-) - A72-1 (FL-)	Always	Below 1 Ω
A12-32 (FL-) or A72-1 (FL-) - Body ground	Always	10 MΩ or higher

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK SPEED SENSOR AND SENSOR ROTOR SERRATIONS

Component with harness connected

(Skid Control ECU Assembly)

Normal Signal Waveform

Reconnect the A10 and A12 skid control ECU assembly connectors.

Install the front skid control sensor wire.
Connect an oscilloscope to the front speed sensor terminal of the skid control ECU assembly and body ground.

Check the waveform output when the wheels are rotated.

OK
The same waveform is output from all the sensors and there is no noise or interference in the waveform.

Note

Check the speed sensor signal after cleaning or replacement.

Click here

Tech Tips

As the vehicle speed (wheel revolution speed) increases, the waveform cycle narrows.
When noise is identified in the waveform on the oscilloscope, the erratic signals are likely due to speed sensor rotor scratches, looseness or attached foreign matter.
The front speed sensor rotor is incorporated into the front axle hub and bearing assembly.

If the front speed sensor rotor needs to be replaced, replace the front axle hub and bearing assembly.

Result

Proceed to
OK
NG

CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

RECONFIRM DTC

Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs
Turn the power switch off.
Turn the power switch on (READY).
Perform a road test.

Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRC > Trouble Codes

Result

Result	Proceed to
DTCs C1464 and/or C1465 are output.	A
DTCs C1464 and C1465 are not output.	B

REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

USE SIMULATION METHOD TO CHECK Click here