BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1271,C1272,C1464,C1465; Low Output Signal of Front Speed Sensor RH (Test Mode DTC); 2019 MY RAV4 RAV4 HV [11/2018

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001EACO
Model Year Start: 2019	Model: RAV4	Prod Date Range: [11/2018 - 02/2019]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1271,C1272,C1464,C1465; Low Output Signal of Front Speed Sensor RH (Test Mode DTC); 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]

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

DESCRIPTION

Each speed sensor detects the wheel speed and sends the signals to the skid control ECU (brake booster with master cylinder assembly). These signals are used for ABS control.

DTCs C1271 and C1272 are cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs C1271 and C1272 are output only in Test Mode.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1271	Low Output Signal of Front Speed Sensor RH (Test Mode DTC)	-	Detected only during Test Mode.	Front speed sensor RH Sensor installation Front speed sensor rotor RH (Front axle hub sub-assembly RH)	-
C1272	Low Output Signal of Front Speed Sensor LH (Test Mode DTC)	-	Detected only during Test Mode.	Front speed sensor LH Sensor installation Front speed sensor rotor LH (Front axle hub sub-assembly LH)	-
C1464	Front Speed Sensor RH Circuit	501 502 503 504 506 507 508 509	INF Code: 501 At a vehicle speed of 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more. INF Code: 502 At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more. INF Code: 503 An open is detected in the speed sensor signal circuit for 0.5 seconds or more. INF Code: 504 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more. INF Code: 506 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more. INF Code: 507 At a vehicle speed of 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more. INF Code: 508 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more. INF Code: 509 Speed sensor output is 270 km/h (167 mph) or more continuously for 5 seconds or more.	INF Code: 501, 502, 504, 507 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 Front speed sensor RH Skid control ECU (Brake booster with master cylinder assembly) INF Code: 503 Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Front speed sensor RH Skid control ECU (Brake booster with master cylinder assembly) INF Code: 506, 508 Open or short in wire harness Skid control ECU (Brake booster with master cylinder assembly) INF Code: 509 Open or short in speed sensor Open or short in wire harness Front speed sensor RH Skid control ECU (Brake booster with master cylinder assembly)	-
C1465	Front Speed Sensor LH Circuit	511 512 513 514 516 517 518 519	INF Code: 511 At a vehicle speed of 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more. INF Code: 512 At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more. INF Code: 513 An open is detected in the speed sensor signal circuit for 0.5 seconds or more. INF Code: 514 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more. INF Code: 516 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more. INF Code: 517 At a vehicle speed of 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more. INF Code: 518 When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more. INF Code: 519 Speed sensor output is 270 km/h (167 mph) or more continuously for 5 seconds or more.	INF Code: 511, 512, 514, 517 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 Front speed sensor LH Skid control ECU (Brake booster with master cylinder assembly) INF Code: 513 Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Front speed sensor LH Skid control ECU (Brake booster with master cylinder assembly) INF Code: 516, 518 Open or short in wire harness Skid control ECU (Brake booster with master cylinder assembly) INF Code: 519 Open or short in speed sensor Open or short in wire harness Front speed sensor LH Skid control ECU (Brake booster with master cylinder assembly)	-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

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

Click here

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

OK:

Normal (There are no momentary interruptions.)

HINT:

Perform the above inspection before removing the sensor and connector.

GO TO STEP 5

2.	READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)

(a) Select the Data List on the Techstream.

Click here

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

(b) 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.

Click here

OK:

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

GO TO STEP 5

3.	PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

(a) Turn the power switch off.

(b) Perform the sensor check in Test Mode Procedure.

Click here

Chassis > ABS/VSC/TRAC > Utility

Tester Display
Signal Check

OK:

All Test Mode DTCs are cleared.

GO TO STEP 5

4.	RECONFIRM DTC

(a) Turn the power switch off.

(b) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(d) Perform a road test.

(e) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

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.

Click here

USE SIMULATION METHOD TO CHECK

GO TO STEP 7

5.	CHECK FRONT SPEED SENSOR INSTALLATION

(a) Turn the power switch off.

*a	No clearance
*b	OK
*c	NG

(b) Check the speed sensor installation.

Click here

OK:

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

The installation bolt is tightened properly.

INSTALL FRONT SPEED SENSOR CORRECTLY

6.	CHECK FRONT SPEED SENSOR AND SENSOR ROTOR

(a) Remove the front speed sensor and the component with the speed sensor rotor.

for Speed Sensor: Click here

for Speed Sensor Rotor: Click here

(b) Check the speed sensor tip and speed sensor rotor.

OK:

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

NOTICE:

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

CLEAN OR REPLACE REAR SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

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

(a) Install the front speed sensor.

Click here

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

(d) Disconnect the A91 or A92 front speed sensor connector.

(e) 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

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

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

for RH

for LH

Front view of wire harness connector

(to Front Speed Sensor)

(b) Turn the power switch on (IG).

Standard Voltage:

for RH

Tester Connection	Condition	Specified Condition
A91-1 (FR+) - Body ground2	Power switch on (IG)	5.7 to 14 V

for LH

Tester Connection	Condition	Specified Condition
A92-1 (FL+) - Body ground	Power switch on (IG)	5.7 to 14 V

REPLACE FRONT SPEED SENSOR

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY