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 TECHSTREAM (FRONT SPEED SENSOR)

PERFORM TEST MODE (SIGNAL CHECK)

CHECK FRONT SPEED SENSOR INSTALLATION

CHECK FRONT SPEED SENSOR TIP

CHECK FRONT SPEED SENSOR ROTOR

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 (COROLLA_ZRE142 RM000000XHR08KX.html).

1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (COROLLA_ZRE142 RM000000XHS0CJX.html).
   
   

   ABS/VSC/TRAC

   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 (COROLLA_ZRE142 RM000000XHS0CJX.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 (COROLLA_ZRE142 RM000000XHT0ATX.html).
   

   OK:

   All Test Mode DTCs are cleared.
   

1. Turn the ignition switch off.
   

2. Connect the Techstream to the DLC3.
   

3. Start the engine.
   

4. Select the Data List on the Techstream (COROLLA_ZRE142 RM000000XHW0BYX.html).
   
   

   ABS/VSC/TRAC

   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 km/h (202 mph)	Actual wheel speed	Similar speed as indicated on speedometer
   FL Wheel Speed	FL wheel speed sensor reading /min.: 0 km/h (0 mph), max.: 326 km/h (202 mph)	Actual wheel speed	Similar speed as indicated on speedometer

5. Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream 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 (COROLLA_ZRE142 RM0000014WB08AX.html).

   OK:

   The speed value output from the speed sensor displayed on the Techstream 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 (COROLLA_ZRE142 RM000000XHT0ATX.html).
   

   OK:

   All Test Mode DTCs are cleared.
   

1. Turn the ignition switch off.
   

2. Check the speed sensor installation.
   

   OK:

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

   The installation nut is tightened properly.
   

   Torque:

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

1. Remove the front speed sensor (COROLLA_ZRE142 RM000002VPG01IX.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 (COROLLA_ZRE142 RM000000XHT0ATX.html).

1. Remove the front speed sensor rotor (COROLLA_ZRE142 RM000001HAY039X.html for 2AZ-FE or COROLLA_ZRE142 RM000001HAY03AX.html for 2ZR-FE).
   

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 (COROLLA_ZRE142 RM000000XHT0ATX.html).

   HINT:

   If the front speed sensor rotor needs to be replaced, replace it together with the front axle outboard joint shaft assembly.

1. Install the front speed sensor and the front speed sensor rotor.
   

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

3. Disconnect the skid control ECU connector and the front speed sensor connector.
   

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

   Standard Resistance:

   for RH:

   Tester Connection	Condition	Specified Condition
   A66-7 (FR+) - A27-2 (FR+)	Always	Below 1 Ω
   A66-7 (FR+) - Body ground	Always	10 kΩ or higher
   A66-6 (FR-) - A27-1 (FR-)	Always	Below 1 Ω
   A66-6 (FR-) - Body ground	Always	10 kΩ or higher

   for LH:

   Tester Connection	Condition	Specified Condition
   A66-19 (FL+) - A28-2 (FL+)	Always	Below 1 Ω
   A66-19 (FL+) - Body ground	Always	10 kΩ or higher
   A66-18 (FL-) - A28-1 (FL-)	Always	Below 1 Ω
   A66-18 (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
   A27-2 (FR+) - Body ground	Ignition switch ON	8 to 14 V

   for LH:

   Tester Connection	Switch Condition	Specified Condition
   A28-2 (FL+) - 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 (COROLLA_ZRE142 RM000000XHT0ATX.html).
   

   OK:

   All Test Mode DTCs are cleared.
   

1. Turn the ignition switch off.
   

2. Replace the front speed sensor (COROLLA_ZRE142 RM000002VPG01IX.html).
   

   NOTICE:

   Check the speed sensor signal after replacement (COROLLA_ZRE142 RM000000XHT0ATX.html).

1. Perform the sensor check in the Test Mode procedure (COROLLA_ZRE142 RM000000XHT0ATX.html).
   

   OK:

   All Test Mode DTCs are cleared.
   

1. Turn the ignition switch off.
   

2. Remove the front drive shaft assembly (COROLLA_ZRE142 RM000001HAY039X.html for 2AZ-FE or COROLLA_ZRE142 RM000001HAY03AX.html for 2ZR-FE).
   

3. Replace the front axle outboard joint shaft assembly (front speed sensor rotor) (COROLLA_ZRE142 RM000001HAZ02LX.html for 2AZ-FE or COROLLA_ZRE142 RM000001IWA03MX.html for 2ZR-FE).
   

   HINT:

   If the front speed sensor rotor needs to be replaced, replace it together with the front axle outboard joint shaft assembly.

   NOTICE:

   Check the speed sensor signal after replacement (COROLLA_ZRE142 RM000000XHT0ATX.html).

1. Install the front drive shaft assembly.
   

2. Perform the sensor check in the Test Mode procedure (COROLLA_ZRE142 RM000000XHT0ATX.html).
   

   OK:

   All Test Mode DTCs are cleared.