DTC C1273/73: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274/74: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1466/33: Rear Speed Sensor RH Circuit; DTC C1467/34: Rear Speed Sensor LH Circuit: Procedure

1. Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC. Refer to CHECK FOR INTERMITTENT PROBLEMS [03/2012 - ] .
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   RR Speed Open	Rear speed sensor RH open detection / Error or Normal	Error: Momentary interruption Normal: Normal	-
   RL Speed Open	Rear speed sensor LH open detection / Error or Normal	Error: Momentary interruption Normal: Normal	-

   OK

   There are no momentary interruptions.

   HINT: 

   Perform the above inspection before removing the sensor and connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Select the Data List on the Techstream. Refer to DATA LIST / ACTIVE TEST [03/2012 - ] .
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   RR Wheel Speed	Rear wheel 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
   RL Wheel Speed	Rear wheel 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

2. 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. Refer to OPERATION CHECK [03/2012 - ] .

   OK

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

NG → See step   5 

OK: Go to next step 

1. Turn the power switch off.
2. Perform the sensor check in the Test Mode procedure. Refer to TEST MODE PROCEDURE [03/2012 - ] .

   OK

   All Test Mode DTCs are cleared.

NG → See step   5 

OK: Go to next step 

1. Turn the power switch off.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .
3. Turn the power switch on (READY).
4. Drive the vehicle at a speed of 10 km/h (6 mph) or more for at least 60 seconds.
5. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [03/2012 - ] .

   Result

   Result	Proceed to
   DTCs (C1466/33 and C1467/34) are not output	A
   DTCs (C1466/33 and/or C1467/34) 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. Refer to PROBLEM SYMPTOMS TABLE [03/2012 - ] .

B → See step   11 

A → See step   16 

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Check the speed sensor installation.

   OK

   There is no clearance between the sensor and the rear axle carrier.

   The installation bolt is tightened properly.

   TEXT IN ILLUSTRATION
   
   

   *a	No clearance
   *b	OK
   *c	NG

NG → See step   17 

OK: Go to next step 

1. Remove the rear speed sensor. Refer to REMOVAL [03/2012 - ] .
2. Check the speed sensor tip.

   OK

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

   NOTE:

   • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

     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.

   • Check the speed sensor signal after cleaning or replacement. Refer to TEST MODE PROCEDURE [03/2012 - ] .

NG → CLEAN OR REPLACE REAR SPEED SENSOR 

OK: Go to next step 

1. Remove the rear axle hub (rear speed sensor rotor). Refer to REMOVAL [03/2012 - ] .
2. Check the speed sensor rotor.

   OK

   No scratches, oil, or foreign matter on the rotors.

   NOTE:

   Check the speed sensor signal after cleaning or replacement. Refer to TEST MODE PROCEDURE [03/2012 - ] .

   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.

NG → CLEAN OR REPLACE REAR SPEED SENSOR ROTOR 

OK: Go to next step 

1. Install the rear speed sensor and rear axle hub (rear speed sensor rotor).
2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the A14 or A16 skid control ECU assembly connector.
4. Disconnect the U32 or T30 rear speed sensor connector.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   for RH 

   for LH 

   Tester Connection	Condition	Specified Condition
   A16-11 (RR+) - T30-1 (RR+)	Always	Below 1 Ω
   A16-11 (RR+) - Body ground	Always	10 kΩ or higher
   A16-10 (RR-) - T30-2 (RR-)	Always	Below 1 Ω
   A16-10 (RR-) - Body ground	Always	10 kΩ or higher

   Tester Connection	Condition	Specified Condition
   A14-11 (RL+) - U32-1 (RL+)	Always	Below 1 Ω
   A14-11 (RL+) - Body ground	Always	10 kΩ or higher
   A14-10 (RL-) - U32-2 (RL-)	Always	Below 1 Ω
   A14-10 (RL-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the skid control ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   for RH 

   for LH 

   Tester Connection	Switch Condition	Specified Condition
   T30-1 (RR+) - Body ground	Power switch on (IG)	7.6 to 14 V

   Tester Connection	Switch Condition	Specified Condition
   U32-1 (RL+) - Body ground	Power switch on (IG)	7.6 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *A	for RH
   *B	for LH
   *a	Front view of wire harness connector (to Rear Speed Sensor)

NG → See step   15 

OK: Go to next step 

1. Turn the power switch off.
2. Reconnect the rear speed sensor connector.
3. Clear the DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .
4. Turn the power switch on (READY).
5. Drive the vehicle at a speed of 10 km/h (6 mph) or more for at least 60 seconds.
6. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [03/2012 - ] .

   Result

   Result	Proceed to
   DTCs (C1466/33 and/or C1467/34) are output	A
   DTCs (C1466/33 and C1467/34) are not 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. Refer to PROBLEM SYMPTOMS TABLE [03/2012 - ] .

B → See step   16 

A: Go to next step 

1. Turn the power switch off.
2. Replace the rear speed sensor. Refer to REMOVAL [03/2012 - ] .
   NOTE:

   Check the speed sensor signal after replacement. Refer to TEST MODE PROCEDURE [03/2012 - ] .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .
2. Turn the power switch on (READY).
3. Drive the vehicle at a speed of 10 km/h (6 mph) or more for at least 60 seconds.
4. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [03/2012 - ] .

   Result

   Result	Proceed to
   DTCs (C1466/33 and/or C1467/34) are output	A
   DTCs (C1466/33 and C1467/34) are not 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. Refer to PROBLEM SYMPTOMS TABLE [03/2012 - ] .

B → END 

A: Go to next step 

1. Turn the power switch off.
2. Replace the rear axle hub and bearing assembly (rear speed sensor rotor). Refer to REMOVAL [03/2012 - ] .

   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.

   NOTE:

   Check the speed sensor signal after replacement. Refer to TEST MODE PROCEDURE [03/2012 - ] .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .
2. Turn the power switch on (READY).
3. Drive the vehicle at a speed of 10 km/h (6 mph) or more for at least 60 seconds.
4. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [03/2012 - ] .

   Result

   Result	Proceed to
   DTCs (C1466/33 and/or C1467/34) are output	A
   DTCs (C1466/33 and C1467/34) are not output	B

B → END 

A → See step   15