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EPS DTC Troubleshooting: 51-01, 51-02, 51-03, 51-04, 51-05

DTC 51-01:
 Torque Sensor (VT1 and VT2) (Regular Diagnosis)
DTC 51-02:
 Torque Sensor VT3 Differential-amplification Function (Regular Diagnosis)
DTC 51-03:
 Torque Sensor (VT1, VT2 Rapid-change) (Regular Diagnosis)
DTC 51-04:
 Torque Sensor (Temperature) (Regular Diagnosis)
DTC 51-05:
 Torque Sensor (Coil) (Regular Diagnosis)
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch to LOCK (0).
  1. Start the engine.
  1. Turn the steering wheel from lock to lock several times, and hold the steering wheel for 10 seconds or more.
  1. Check for DTCs with the HDS.
Is DTC 51-01, 51-02, 51-03, 51-04, or 51-05 indicated?
YES -
Go to Step 7 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EPS motor and the EPS control unit.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the EPS control unit connector C (16P).
  1. Measure the resistance between EPS control unit connector C (16P) terminals No. 2 and No. 3.
Is there resistance 10 Ω or less at 20 °C (68 °F)?
YES -
Go to Step 10 .
NO -
Go to Step 12 .
  1. Disconnect the torque sensor 3P connector.

  1. On the torque sensor side, measure the resistance between torque sensor 3P connector terminals No. 1 and No. 2.
Is there resistance 10 Ω or less at 20 °C (68 °F)?
YES -
NO -
Repair short in the wires between the EPS control unit and torque sensor.■

  1. Measure the resistance between EPS control unit connector C (16P) terminals No. 1 and No. 2.
Is there resistance 10 Ω or less at 20 °C (68 °F)?
YES -
Go to Step 13 .
NO -
Go to Step 15 .
  1. Disconnect the torque sensor 3P connector.

  1. On the torque sensor side, measure the resistance between torque sensor 3P connector terminals No. 2 and No. 3.
Is there resistance 10 Ω or less at 20 °C (68 °F)?
YES -
NO -
Repair short in the wires between the EPS control unit and torque sensor.■

  1. Measure the resistance between EPS control unit connector C (16P) terminals No. 1 and No. 3.
Is there resistance 10 Ω or less at 20 °C (68 °F)?
YES -
Go to Step 16 .
NO -
Go to Step 18 .
  1. Disconnect the torque sensor 3P connector.

  1. On the torque sensor side, measure the resistance between torque sensor 3P connector terminals No. 1 and No. 3.
Is there resistance 10 Ω or less at 20 °C (68 °F)?
YES -
NO -
Repair short in the wires between the EPS control unit and torque sensor.■

  1. Check for continuity between body ground and EPS control unit connector C (16P) No. 1 terminal, and No. 3 terminal.
Is there continuity?
YES -
Go to Step 17 .
NO -
Go to Step 19 .
  1. Disconnect the torque sensor 3P connector.

  1. On the torque sensor side, check for continuity between body ground and torque sensor 3P connector No. 1 terminal, and No. 3 terminal.
Is there continuity?
YES -
NO -
Repair short to body ground in the wire between the EPS control unit and torque sensor.■
  1. Disconnect the torque sensor 3P connector.

  1. Check for continuity between EPS control unit connector C (16P) terminal and the torque sensor 3P connector terminal individually.
    Sign
    Torque Sensor 3P Connector
    EPS Control Unit Connector C (16P) Terminal
    VS1
    1
    3
    T/S GND
    2
    2
    VS2
    3
    1

Is there continuity?
YES -
Go to Step 21 .
NO -
Repair open in the wire between the EPS control unit and torque sensor.■

  1. On the torque sensor side, measure the resistance between torque sensor 3P connector terminals No. 1 and No. 2, and No. 2 and No. 3 individually.
Is there resistance 10−40 Ω at 20 °C (68 °F)?
YES -
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.
NO -