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 .
   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 .
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   RR Wheel Speed	Rear speed sensor RH / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations
   RL Wheel Speed	Rear speed sensor LH / Min.: 0 km/h (0 mph), Max.: 326.4 km/h (202 mph)	Vehicle stopped: 0 km/h (0 mph)	When driving at constant speed: No large fluctuations

2. Check that 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 ON-VEHICLE INSPECTION .

   OK

   The speed value output from the speed sensor displayed on the Techstream is the similar speed as 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 .

   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 .
3. Turn the power switch on (READY).
4. Perform a road test.
5. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   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 .

B → See step   10 

A → See step   12 

1. Turn the power switch off.
   Fig 1: Identifying Rear Speed Sensor Proper Installation Position

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the speed sensor installation.

   OK

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

NG → See step   14 

OK: Go to next step 

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
   Fig 2: Identifying Rear Speed Sensor Connector And Skid Control Sensor Wire

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the rear speed sensor connector and the skid control sensor wire.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   for RH 

   for LH 

   Tester Connection	Condition	Specified Condition
   z2 ("A"-2) - z2 ("B"-1)	Always	Below 1 Ω
   z2 ("A"-2) - z2 ("B"-2)	Always	10 kΩ or higher
   z2 ("A"-2) - Body ground	Always	10 kΩ or higher
   z2 ("A"-1) - z2 ("B"-2)	Always	Below 1 Ω
   z2 ("A"-1) - z2 ("B"-1)	Always	10 kΩ or higher
   z2("A"-1) - Body ground	Always	10 kΩ or higher

   Tester Connection	Condition	Specified Condition
   z1 ("A"-2) - z1 ("B"-1)	Always	Below 1 Ω
   z1 ("A"-2) - z1 ("B"-2)	Always	10 kΩ or higher
   z1 ("A"-2) - Body ground	Always	10 kΩ or higher
   z1 ("A"-1) - z1 ("B"-2)	Always	Below 1 Ω
   z1 ("A"-1) - z1 ("B"-1)	Always	10 kΩ or higher
   z1 ("A"-1) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of skid control sensor wire
   *2	for RH
   *3	for LH
   *4	Front view of wire harness connector (to Sensor Side Connector "A")
   *5	Front view of wire harness connector (to Vehicle Side Connector "B")

   NOTE:

   Check the speed sensor signal after replacement. Refer to TEST MODE PROCEDURE .

NG → See step   15 

OK: Go to next step 

1. Reconnect the skid control sensor wire (for vehicle side connector).
   Fig 3: Identifying Skid Control Sensor Wire (For Vehicle Side Connector)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the skid control ECU connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   for RH 

   for LH 

   Tester Connection	Condition	Specified Condition
   A58-22 (RR+) - z2-2 (RR+)	Always	Below 1 Ω
   A58-22 (RR+) - Body ground	Always	10 kΩ or higher
   A58-9 (RR-) - z2-1 (RR-)	Always	Below 1 Ω
   A58-9 (RR-) - Body ground	Always	10 kΩ or higher

   Tester Connection	Condition	Specified Condition
   A58-20 (RL+) - z1-2 (RL+)	Always	Below 1 Ω
   A58-20 (RL+) - Body ground	Always	10 kΩ or higher
   A58-7 (RL-) - z1-1 (RL-)	Always	Below 1 Ω
   A58-7 (RL-) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Skid Control ECU)
   *2	Front view of wire harness connector (to Rear Speed Sensor)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the skid control ECU connector.
   Fig 4: Identifying Skid Control ECU Connector Terminals

   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
   z2-2 (RR+) - Body ground	Power switch on (IG)	5.7 to 14 V

   Tester Connection	Switch Condition	Specified Condition
   z1-2 (RL+) - Body ground	Power switch on (IG)	5.7 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Rear Speed Sensor)

NG → See step   13 

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 .
4. Turn the power switch on (READY).
5. Perform a road test.
6. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   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 .

B → See step   12 

A: Go to next step 

1. Turn the power switch off.
2. Replace the rear speed sensor and the rear axle hub and bearing assembly (rear speed sensor rotor). Refer to REMOVAL .

   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.

   NOTE:

   Check the speed sensor signal after replacement. Refer to TEST MODE PROCEDURE .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Turn the power switch on (READY).
3. Perform a road test.
4. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   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 .

B → END 

A → See step   13