DTC Troubleshooting: 51-01

DTC 51-01:  Torque Sensor Upper/Low Limit (VT1/VT2 Voltage) (Regular diagnosis)

1.Turn the ignition switch OFF.

2.Connect the HDS to the data link connector (DLC).

3.Turn the ignition switch ON (II).

4.Check the ADVT1-W in the DATA LIST with the HDS.

Is the voltage at 0.90-3.55 V?


YES - Go to 5.


NO - Go to 6.


5.Check the ADVT2-W in the DATA LIST with the HDS.

Is the voltage at 1.02-3.73 V?


YES - Check for loose wires or poor connections. If the connections are good, the system is OK at this time.n


NO - Go to 6.


6.Turn the ignition switch OFF.

7.Disconnect the EPS control unit connector D (28P).

8.Check for resistance between EPS control unit connector D (28P) terminals No. 9 and No. 10.

 

Is the resistance between 12-15 W?


YES - Go to 9.


NO - Go to 13.

9.Check for resistance between EPS control unit connector D (28P) terminals No. 8 and No. 9.

 

Is the resistance between 12-15 W?


YES - Go to 10.


NO - Go to 15.


10.Check for continuity between EPS control unit connector D (28P) terminals No. 9 and body ground.

 

Is there continuity?


YES - Go to 11.


NO - Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit.n

11.Disconnect the torque sensor 3P connector from the steering gearbox.

12.Check for continuity between torque sensor 3P connector terminals No. 2 and body ground.

 

Is there continuity?


YES - Repair short to ground in the wire between the torque sensor and EPS control unit.n


NO - Faulty torque sensor (short in the sensor internal circuit), replace the steering gearbox.n


13.Disconnect the torque sensor 3P connector from the steering gearbox.

14.On the sensor side, check for resistance between torque sensor terminals No. 1 and No. 2.

 

Is the resistance between 12-15 W?


YES - Repair open or short between the PNK and BLU/RED wires in the torque sensor circuit between torque sensor and EPS control unit.n


NO - Faulty torque sensor (short or open in the internal circuit), replace the steering gearbox.n


15.Disconnect the torque sensor 3P connector from the steering gearbox.

16.On the sensor side, check for resistance between torque sensor terminals No. 2 and No. 3.

 

Is the resistance between 12-15 W?


YES - Repair open or short between the WHT/GRN and BLU/RED wires in the torque sensor circuit between torque sensor and EPS control unit.n


NO - Faulty torque sensor (short or open in the internal circuit), replace the steering gearbox.n