Dtc C1271 Low Output Signal Of Front Speed Sensor Rh (Test Mode Dtc)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

PERFORM TEST MODE (SIGNAL CHECK)

READ VALUE USING INTELLIGENT TESTER (FR/FL WHEEL SPEED)

PERFORM TEST MODE (SIGNAL CHECK)

CHECK FRONT SPEED SENSOR INSTALLATION

CHECK FRONT SPEED SENSOR TIP

CHECK FRONT SPEED SENSOR ROTOR

INSPECT FRONT SPEED SENSOR

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

INSPECT SKID CONTROL ECU (SENSOR INPUT)

PERFORM TEST MODE (SIGNAL CHECK)

REPLACE FRONT SPEED SENSOR

PERFORM TEST MODE (SIGNAL CHECK)

REPLACE FRONT SPEED SENSOR ROTOR

PERFORM TEST MODE (SIGNAL CHECK)

DESCRIPTION

HINT:

1. DTCs C1271 and C1275 are for the front speed sensor RH.
   
2. DTCs C1272 and C1276 are for the front speed sensor LH.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

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

1. 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
   FR Speed Open	FR speed sensor open detection / ERROR or NORMAL	ERROR: Momentary interruption NORMAL: Normal	-
   FL Speed Open	FL 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.

1. Turn the ignition switch off.
   

2. Repair or replace the harness or connector.
   

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

4. Check that there are no momentary interruptions.
   

1. Turn the ignition switch off.
   

2. Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
   

   OK:

   All Test Mode DTCs are cleared.
   

1. Turn the ignition switch off.
   

2. Connect the intelligent tester to the DLC3.
   

3. Start the engine.
   

4. 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
   FR Wheel Speed	FR 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
   FL Wheel Speed	FL 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

5. 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).
   

1. Turn the ignition switch off.
   

2. Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
   

   OK:

   All Test Mode DTCs are cleared.
   

1. Turn the ignition switch off.
   

2. Check the speed sensor installation (RAV4_ACA30 RM000001XVC007X_02_0001.html).
   

   OK:

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

   The installation bolt is tightened properly.
   

   Torque:

   8.5 N*m (87 kgf*cm, 75 in.*lbf)
   

1. Remove the front speed sensor (RAV4_ACA30 RM000001XVE009X.html).
   

2. 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).

1. Remove the front axle hub sub-assembly (RAV4_ACA30 RM00000227J00IX.html).
   

2. 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 speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.

1. Install the front speed sensor and front axle hub sub-assembly.
   

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

3. Disconnect the front speed sensor connector.
   

4. 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

   NOTICE:

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

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

2. Disconnect the skid control ECU connector.
   

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

   Standard Resistance:

   for RH:

   Tester Connection	Condition	Specified Condition
   A67-7 (FR+) - A62-1	Always	Below 1 Ω
   A67-7 (FR+) - Body ground	Always	10 kΩ or higher
   A67-6 (FR-) - A62-2	Always	Below 1 Ω
   A67-6 (FR-) - Body ground	Always	10 kΩ or higher

   for LH:

   Tester Connection	Condition	Specified Condition
   A67-19 (FL+) - A61-1	Always	Below 1 Ω
   A67-19 (FL+) - Body ground	Always	10 kΩ or higher
   A67-18 (FL-) - A61-2	Always	Below 1 Ω
   A67-18 (FL-) - Body ground	Always	10 kΩ or higher

1. Reconnect the skid control ECU connector.
   

2. Turn the ignition switch to ON.
   

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

   Standard Voltage:

   for RH:

   Tester Connection	Switch Condition	Specified Condition
   A62-1 - Body ground	Ignition switch ON	8 to 14 V

   for LH:

   Tester Connection	Switch Condition	Specified Condition
   A61-1 - Body ground	Ignition switch ON	8 to 14 V

1. Turn the ignition switch off.
   

2. Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
   

   OK:

   All Test Mode DTCs are cleared.
   

1. Turn the ignition switch off.
   

2. Replace the front speed sensor (RAV4_ACA30 RM000001XVE009X.html).
   

   NOTICE:

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

1. Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
   

   OK:

   All Test Mode DTCs are cleared.
   

1. Turn the ignition switch off.
   

2. Replace the front axle hub sub-assembly (front speed sensor rotor) (RAV4_ACA30 RM00000227J00IX.html).
   

   HINT:

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

   NOTICE:

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

1. Perform the sensor check in the Test Mode procedure (RAV4_ACA30 RM0000022CZ007X.html).
   

   OK:

   All Test Mode DTCs are cleared.