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Home >> Tesla >> 2012 >> Model S >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering -- Model S >> Steering Rack And Lower Column >> Lock To Lock-Angle Test >> Test Procedure
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Test Procedure

  1. Connect a laptop to the diagnostic port of the vehicle, and then use Toolbox 3 to locally connect to the vehicle. See Toolbox 3 (Connect and Disconnect) .
  2. Enable Service Mode through the touchscreen. See Service Mode .
  3. On the vehicle touchscreen, touch CAN Viewer  and select the signals STW_ANGLHP_STAT > StW_AnglHP  and EPAS_sysStatus > EPAS_torsionBarTorque  .
    NOTE: STW_ANGLHP_STAT > StW_AnglHP  can be found under CH  bus. EPAS_sysStatus > EPAS_torsionBarTorque  can be found under CH  bus on Intel MCU's, and under ETH  bus on Tegra MCU's.
  4. Turn the steering to the left lock stop and hold the EPAS_torsionBarTorque  value at 10 N.m while reading the angle. Record this value.
  5. Turn the steering to the right lock stop and hold the EPAS_torsionBarTorque  value at 10 N.m while reading the angle. Record this value.
  6. If the two angle values are more than 6 degrees apart, center the steering wheel. See Steering Wheel (Remove And Replace) .
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