EPS DTC Troubleshooting: 51-02, 51-03, 51-06, 51-07
DTC 51-02:
 Torque Sensor (VT3 Differential-amplification Function) (Regular diagnosis)
DTC 51-03:
 Torque Sensor (VT1, VT2 Rapid-change) (Regular diagnosis)
DTC 51-06:
 Torque Sensor (VT1, VT2 Average) (Regular diagnosis)
DTC 51-07:
 Torque Sensor (VT1, VT2 Initial Check) (Initila diagnosis)
  1. Turn the ignition switch OFF.
  1. Start the engine.
Does the EPS indicator come on?
YES -
Go to Step 4 .
NO -
Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.■
  1. Verify the DTC.
Is DTC 51-02, 51-03, 51-06 or DTC 51-07 indicated?
YES -
Go to Step 5 .
NO -
Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time.■
  1. Turn the ignition switch OFF.
  1. Disconnect the EPS control unit connector D (28P).
  1. Check for resistance between EPS control unit connector D (28P) terminals No. 9 and No. 10.
Is the resistance between 12−15 Ω (at normal)?
YES -
Go to Step 8 .
NO -
Go to Step 12 .
  1. Check for resistance between EPS control unit connector D (28P) terminals No. 8 and No. 9.
Is the resistance between 12−15 Ω (at normal)?
YES -
Go to Step 9 .
NO -
Go to Step 14 .
  1. Check for continuity between EPS control unit connector D (28P) terminal No. 9 and body ground.
Is there continuity?
YES -
Go to Step 10 .
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. ■
  1. Disconnect the torque sensor 3P connector from the steering gearbox.
  1. Check for continuity between torque sensor 3P connector terminal No. 2 and body ground.
Is there continuity?
YES -
Repair short to ground in the wire between the torque sensor and the EPS control unit.■
NO -
Faulty torque sonsor (short in the sensor internal circuit), replace the steering gearbox. ■
  1. Disconnect the torque sensor 3P connector from the steering gearbox.
  1. On the sensor side, check for resistance between torque sensor terminals No. 1 and No. 2.
Is the resistance between 12−15 Ω (at normal)?
YES -
Repair open or short between the PNK and BLU/RED wires in the torque sensor circuit between the torque sensor and the EPS control unit.■
NO -
Faulty torque sensor (short or open in the internal circuit), replace the steering gearbox. ■
  1. Disconnect the torque sensor 3P connector from the steering gearbox.
  1. On the sensor side, check for resistance between torque sensor terminals No. 2 and No. 3.
Is the resistance between 12−15 Ω (at normal)?
YES -
Repair open or short between the BLU/RED and WHT/GRN wires in the torque sensor circuit between the torque sensor and the EPS control unit.■
NO -
Faulty torque sensor (short or open in the internal circuit), replace the steering gearbox. ■