BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1235,...,C1278; Foreign Object is Attached on Tip of Front Speed Sensor RH; 2021 MY RAV4 RAV4 HV [08/2020

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001QINO
Model Year Start: 2021	Model: RAV4	Prod Date Range: [08/2020 - 12/2021]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1235,...,C1278; Foreign Object is Attached on Tip of Front Speed Sensor RH; 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]

DTC

C1235

Foreign Object is Attached on Tip of Front Speed Sensor RH

DTC

C1236

Foreign Object is Attached on Tip of Front Speed Sensor LH

DTC

C1238

Foreign Object is Attached on Tip of Rear Speed Sensor RH

DTC

C1239

Foreign Object is Attached on Tip of Rear Speed Sensor LH

DTC

C1275

Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)

DTC

C1276

Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)

DTC

C1277

Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)

DTC

C1278

Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DESCRIPTION

When foreign matter adheres to a speed sensor tip or speed sensor rotor, these DTCs are stored. The presence of foreign matter can be judged when an abnormal waveform is received from a sensor.

These DTCs may also be detected when a malfunction occurs in the connector terminals or wire harness of the speed sensor circuit.

DTCs C1275 to C1278 will be cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs from C1275 to C1278 are output only in Test Mode.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1235	Foreign Object is Attached on Tip of Front Speed Sensor RH	541	Either of the following is detected: At a vehicle speed of 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.	Speed sensor rotor malfunction (foreign matter attached) Foreign matter attached to speed sensor Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Resistance in speed sensor circuit	-
C1236	Foreign Object is Attached on Tip of Front Speed Sensor LH	542	Either of the following is detected: At a vehicle speed of 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.	Speed sensor rotor malfunction (foreign matter attached) Foreign matter attached to speed sensor Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Resistance in speed sensor circuit	-
C1238	Foreign Object is Attached on Tip of Rear Speed Sensor RH	543	Either of the following is detected: At a vehicle speed of 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.	Speed sensor rotor malfunction (foreign matter attached) Foreign matter attached to speed sensor Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Resistance in speed sensor circuit	-
C1239	Foreign Object is Attached on Tip of Rear Speed Sensor LH	544	Either of the following is detected: At a vehicle speed of 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.	Speed sensor rotor malfunction (foreign matter attached) Foreign matter attached to speed sensor Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Resistance in speed sensor circuit	-
C1275	Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)	-	Detected only during Test Mode.	Front speed sensor RH Front speed sensor rotor RH (Front axle hub sub-assembly RH)	-
C1276	Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)	-	Detected only during Test Mode.	Front speed sensor LH Front speed sensor rotor LH (Front axle hub sub-assembly LH)	-
C1277	Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)	-	Detected only during Test Mode.	Rear speed sensor RH Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)	-
C1278	Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)	-	Detected only during Test Mode.	Rear speed sensor LH Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)	-

DTC Detection Conditions: C1235

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	At a vehicle speed of 20 km/h (12 mph) or more	○	-
Diagnosis Condition	At a vehicle speed of 10 km/h (6 mph) or more	-	○
Malfunction Status	Noise occurs on the speed sensor signal waveform	○	-
Malfunction Status	Noise occurs once per wheel revolution	-	○
Detection Time		5 seconds or more	15 seconds or more
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C1236

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	At a vehicle speed of 20 km/h (12 mph) or more	○	-
Diagnosis Condition	At a vehicle speed of 10 km/h (6 mph) or more	-	○
Malfunction Status	Noise occurs on the speed sensor signal waveform	○	-
Malfunction Status	Noise occurs once per wheel revolution	-	○
Detection Time		5 seconds or more	15 seconds or more
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C1238

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	At a vehicle speed of 20 km/h (12 mph) or more	○	-
Diagnosis Condition	At a vehicle speed of 10 km/h (6 mph) or more	-	○
Malfunction Status	Noise occurs on the speed sensor signal waveform	○	-
Malfunction Status	Noise occurs once per wheel revolution	-	○
Detection Time		5 seconds or more	15 seconds or more
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C1239

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	At a vehicle speed of 20 km/h (12 mph) or more	○	-
Diagnosis Condition	At a vehicle speed of 10 km/h (6 mph) or more	-	○
Malfunction Status	Noise occurs on the speed sensor signal waveform	○	-
Malfunction Status	Noise occurs once per wheel revolution	-	○
Detection Time		5 seconds or more	15 seconds or more
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

Refer to DTCs C1464, C1465, C1466 and C1467.

for Front: Click here

for Rear: Click here

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

CHECK DTC

(a) Check that no speed sensor malfunction DTCs are output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

HINT:

When C1464, C1465, C1466, and/or C1467 are output together with C1235, C12366, C1238, and/or C1239, inspect and repair the trouble areas indicated by C1464, C1465, C1466, and/or C1467 first.

Result	Proceed to
DTCs C1235 and/or C1236 are output.	A
DTCs C1238 and C1239 are output.	B
Speed sensor malfunction DTCs (C1464, C1465, C1466 and/or C1467) are output.	C

GO TO STEP 5

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

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

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

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

(d) 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

3.	CHECK FRONT SPEED SENSOR

(a) Check the speed sensor tip.

OK:

The sensor tip is free of oil and foreign matter.

CLEAN FRONT SPEED SENSOR

4.	CHECK FRONT AXLE HUB SUB-ASSEMBLY

(a) Check the speed sensor rotor (front axle hub sub-assembly).

OK:

The speed sensor rotor is free of scratches, oil, and foreign matter.

HINT:

The speed sensor rotor is incorporated into the front axle hub sub-assembly.

Result	Proceed to
OK	A
Foreign matter and oil present	B
Damage present	C

REPLACE FRONT SPEED SENSOR

CLEAN SPEED SENSOR ROTOR

REPLACE FRONT AXLE HUB SUB-ASSEMBLY

5.	INSPECT PARKING BRAKE WIRE ASSEMBLY

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

*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)

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

(d) 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

NOTICE:

Check the speed sensor signal after replacement.

Click here

REPLACE PARKING BRAKE WIRE ASSEMBLY

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

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

(b) Reconnect the MM3 or NN6 skid control sensor wire (parking brake wire assembly) connector.

(d) 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

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK REAR SPEED SENSOR

(a) Check the speed sensor tip.

OK:

The sensor tip is free of oil and foreign matter.

CLEAN REAR SPEED SENSOR

8.	CHECK REAR AXLE HUB SUB-ASSEMBLY

(a) Check the speed sensor rotor (rear axle hub sub-assembly).

OK:

The speed sensor rotor is free of scratches, oil, and foreign matter.

HINT:

The speed sensor rotor is incorporated into the rear axle hub sub-assembly.

Result	Proceed to
OK	A
Foreign matter and oil present	B
Damage present	C

REPLACE REAR SPEED SENSOR

CLEAN SPEED SENSOR ROTOR

REPLACE REAR AXLE HUB SUB-ASSEMBLY