Brake Control. Dtc C1273 Low Output Signal Of Rear Speed Sensor Rh (Test Mode Dtc)

DTCs C1273 to C1278 will be cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs from C1273 to C1278 are output only in Test Mode.

DTC Code	DTC Detection Condition	Trouble Area
C1273 C1274	Detected only during Test Mode.	Rear speed sensor RH/LH Sensor installation Speed sensor rotor
C1277 C1278	Detected only during Test Mode.	Speed sensor rotor

HINT:

DTCs C1273 and C1277 are for the rear speed sensor RH.
DTCs C1274 and C1278 are for the rear speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1403 and C1404 (RAV4_ACA30 RM00000369R00BX_02.html).

INSPECTION PROCEDURE

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration (RAV4_ACA30 RM000001K1O00SX.html).

1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to the DTC (RAV4_ACA30 RM000000XHS04QX.html).

ABS/VSC/TRC:
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
RR Speed Open	RR speed sensor open detection / ERROR or NORMAL	ERROR: Momentary interruption NORMAL: Normal	-
RL Speed Open	RL speed sensor open detection / ERROR or NORMAL	ERROR: Momentary interruption NORMAL: Normal	-

Result:

Result	Proceed to
There are momentary interruptions.	A
There are no momentary interruptions.	B
There is a constant open circuit.	C

HINT:

Perform the above inspection before removing the sensor and connector.

Go to step 4

Go to step 6

A

2.REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)

Turn the ignition switch off.

Repair or replace the harness or connector.

Check for any momentary interruption between the skid control ECU and the rear speed sensor (RAV4_ACA30 RM000000XHS04QX.html).

Check that there are no momentary interruptions.

NEXT

3.PERFORM TEST MODE (SIGNAL CHECK)

Turn the ignition switch off.

Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
OK:
All Test Mode DTCs are cleared.

Go to step 4

END

4.READ VALUE USING INTELLIGENT TESTER (RR/RL WHEEL SPEED)

Turn the ignition switch off.

Connect the intelligent tester to the DLC3.

Start the engine.

Select the Data List mode on the intelligent tester (RAV4_ACA30 RM000000ONK01EX.html).

ABS/VSC/TRC:
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
RR Wheel Speed	RR wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326.4 km/h (202.8 mph)	Actual wheel speed	Similar to speed indicated on the speedometer.
RL Wheel Speed	RL wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326.4 km/h (202.8 mph)	Actual wheel speed	Similar to speed indicated on the speedometer.

Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle.
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 (RAV4_ACA30 RM0000020M9001X.html).
OK:
The speed value output from the speed sensor displayed on the intelligent tester is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

Go to step 6

OK

5.PERFORM TEST MODE (SIGNAL CHECK)

Turn the ignition switch off.

Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
OK:
All Test Mode DTCs are cleared.

Go to step 6

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (RAV4_ACA30 RM00000135201PX.html)

6.CHECK SKID CONTROL SENSOR/REAR SPEED SENSOR INSTALLATION

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System.
Dtc
C1273 Low Output Signal Of Rear Speed Sensor Rh (Test Mode Dtc)

Turn the ignition switch off.

for 2WD:
Check the skid control sensor installation.
OK:
There is no clearance between the sensor and the rear axle carrier.

for 4WD:
Check the rear speed sensor installation.
OK:
There is no clearance between the sensor and the rear axle carrier.
The installation bolt is tightened properly.
Torque:
8.5 N*m (87 kgf*cm, 75 in.*lbf)
Result:
Result
Proceed to
OK
for 4WD
A
for 2WD
B
NG
for 2WD
C
for 4WD
D

Go to step 9

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (RAV4_ACA30 RM00000227S005X.html)

INSTALL REAR SPEED SENSOR CORRECTLY (RAV4_ACA30 RM000001XVJ003X_02_0001.html)

A

7.CHECK REAR SPEED SENSOR TIP

Remove the rear speed sensor (RAV4_ACA30 RM000001XVL007X.html).

Check the speed sensor tip.
OK:
No scratches, oil, or foreign matter on the sensor tip.
NOTICE:
Check the speed sensor signal after cleaning or replacement (RAV4_ACA30 RM0000022CZ007X.html).

CLEAN OR REPLACE REAR SPEED SENSOR

OK

8.CHECK REAR SPEED SENSOR ROTOR

Remove the rear axle hub and bearing assembly (RAV4_ACA30 RM00000227S005X.html).

Check the speed sensor rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
NOTICE:
Check the speed sensor signal after cleaning or replacement (RAV4_ACA30 RM0000022CZ007X.html).
HINT:
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.

CLEAN OR REPLACE REAR SPEED SENSOR ROTOR

OK

9.INSPECT SKID CONTROL SENSOR/REAR SPEED SENSOR

for 4WD:
Install the rear speed sensor and rear speed sensor rotor.

Make sure that there is no looseness in the locking part and connecting part of the connector.

Disconnect the sensor connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
1 - Body ground
Always
10 kΩ or higher
2 - Body ground
Always
10 kΩ or higher
Result:
Result
Proceed to
OK
for 2WD
A
for 4WD
B
NG
for 2WD
C
for 4WD
D
NOTICE:
Check the speed sensor signal after replacement (RAV4_ACA30 RM0000022CZ007X.html).

Go to step 11

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (RAV4_ACA30 RM00000227S005X.html)

REPLACE REAR SPEED SENSOR (RAV4_ACA30 RM000001XVL007X.html)

A

10.CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)

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

Disconnect the 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
W1 ("A"-2) - W1 ("B"-1)	Always	Below 1 Ω
W1 ("A"-2) - W1 ("B"-2)	Always	10 kΩ or higher
W1 ("A"-2) - Body ground	Always	10 kΩ or higher
W1 ("A"-1) - W1 ("B"-2)	Always	Below 1 Ω
W1 ("A"-1) - W1 ("B"-1)	Always	10 kΩ or higher
W1 ("A"-1) - Body ground	Always	10 kΩ or higher

for LH:

Tester Connection	Condition	Specified Condition
X1 ("A"-2) - X1 ("B"-1)	Always	Below 1 Ω
X1 ("A"-2) - X1 ("B"-2)	Always	10 kΩ or higher
X1 ("A"-2) - Body ground	Always	10 kΩ or higher
X1 ("A"-1) - X1 ("B"-2)	Always	Below 1 Ω
X1 ("A"-1) - X1 ("B"-1)	Always	10 kΩ or higher
X1 ("A"-1) - Body ground	Always	10 kΩ or higher

NOTICE:

Check the speed sensor signal after replacement (RAV4_ACA30 RM0000022CZ007X.html).

REPLACE SKID CONTROL SENSOR WIRE (RAV4_ACA30 RM000001YCG00CX.html)

OK

11.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL SENSOR/REAR SPEED SENSOR)

for 2WD:
Reconnect the skid control sensor wire.

Make sure that there is no looseness in the locking part and connecting part of the connector.

Disconnect the skid control ECU connector.

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

Standard Resistance:

for 2WD RH:

Tester Connection	Condition	Specified Condition
A67-17 (RR+) - W1-2	Always	Below 1 Ω
A67-17 (RR+) - Body ground	Always	10 kΩ or higher
A67-16 (RR-) - W1-1	Always	Below 1 Ω
A67-16 (RR-) - Body ground	Always	10 kΩ or higher

for 4WD RH:

Tester Connection	Condition	Specified Condition
A67-17 (RR+) - K29-1	Always	Below 1 Ω
A67-17 (RR+) - Body ground	Always	10 kΩ or higher
A67-16 (RR-) - K29-2	Always	Below 1 Ω
A67-16 (RR-) - Body ground	Always	10 kΩ or higher

for 2WD LH:

Tester Connection	Condition	Specified Condition
A67-5 (RL+) - X1-2	Always	Below 1 Ω
A67-5 (RL+) - Body ground	Always	10 kΩ or higher
A67-4 (RL-) - X1-1	Always	Below 1 Ω
A67-4 (RL-) - Body ground	Always	10 kΩ or higher

for 4WD LH:

Tester Connection	Condition	Specified Condition
A67-5 (RL+) - K28-1	Always	Below 1 Ω
A67-5 (RL+) - Body ground	Always	10 kΩ or higher
A67-4 (RL-) - K28-2	Always	Below 1 Ω
A67-4 (RL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.INSPECT SKID CONTROL ECU (SENSOR INPUT)

Reconnect the skid control ECU connector.

Turn the ignition switch to ON.

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

Standard Voltage:
for 2WD RH:
Tester Connection
Switch Condition
Specified Condition
W1-2 - Body ground
Ignition switch ON
8 to 14 V
for 4WD RH:
Tester Connection
Switch Condition
Specified Condition
K29-1 - Body ground
Ignition switch ON
8 to 14 V
for 2WD LH:
Tester Connection
Switch Condition
Specified Condition
X1-2 - Body ground
Ignition switch ON
8 to 14 V
for 4WD LH:
Tester Connection
Switch Condition
Specified Condition
K28-1 - Body ground
Ignition switch ON
8 to 14 V

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)

OK

13.PERFORM TEST MODE (SIGNAL CHECK)

Turn the ignition switch off.

Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
OK:
All Test Mode DTCs are cleared.
Result:
Result
Proceed to
OK
A
NG
for 2WD
B
for 4WD
C

Go to step 14

Go to step 16

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (RAV4_ACA30 RM00000135201PX.html)

14.REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

Turn the ignition switch off.

Replace the rear axle hub and bearing assembly (rear speed sensor and rotor) (RAV4_ACA30 RM00000227S005X.html).
HINT:
The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly with rear speed sensor.
NOTICE:
Check the speed sensor signal after replacement (RAV4_ACA30 RM0000022CZ007X.html).

NEXT

15.PERFORM TEST MODE (SIGNAL CHECK)

Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
OK:
All Test Mode DTCs are cleared.

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)

END

16.REPLACE REAR SPEED SENSOR

Turn the ignition switch off.

Replace the rear speed sensor (RAV4_ACA30 RM000001XVL007X.html).
NOTICE:
Check the speed sensor signal after replacement (RAV4_ACA30 RM0000022CZ007X.html).

NEXT

17.PERFORM TEST MODE (SIGNAL CHECK)

Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
OK:
All Test Mode DTCs are cleared.

Go to step 18

END

18.REPLACE REAR SPEED SENSOR ROTOR

Turn the ignition switch off.

Replace the rear axle hub and bearing assembly (rear speed sensor rotor) (RAV4_ACA30 RM00000227S005X.html).
HINT:
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly.
NOTICE:
Check the speed sensor signal after replacement (RAV4_ACA30 RM0000022CZ007X.html).

NEXT

19.PERFORM TEST MODE (SIGNAL CHECK)

Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
OK:
All Test Mode DTCs are cleared.

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)

END

Tester Connection	Switch Condition	Specified Condition
W1-2 - Body ground	Ignition switch ON	8 to 14 V