( TF09E00K801000R4121FAAT00 )
VSA DTC Troubleshooting: 41-21, 42-21, 43-21, 44-21
DTC 41-21:
 Right-front Wheel Lock
DTC 42-21:
 Left-front Wheel Lock
DTC 43-21:
 Right-rear Wheel Lock
DTC 44-21:
 Left-rear Wheel Lock
The DTCs may be indicated under these conditions:
  • The vehicle goes into a spin.
  • The ABS or VSA continues to operate for a long time.
  • Snow, dirt, or debris build-up on the wheel speed sensor or magnetic encoder.
  • Misadjusted brake pedal position switch.
  • Contaminated brake fluid.
  1. Turn the appropriate wheel by hand.
    DTC
    Appropriate Wheel
    41-21
    Right-front
    42-21
    Left-front
    43-21
    Right-rear
    44-21
    Left-rear

Is there brake drag?
YES -
Repair the brake drag.■
NO -
Go to Step 3 .
Is the wheel speed sensor installation OK?
YES -
Go to Step 4 .
NO -
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Test-drive the vehicle. Drive the vehicle at 10 km/h (7 mph) for 20 seconds or more.
    NOTE: Drive the vehicle on a straight section of road, not on a lift.
  1. Check for DTCs with the HDS.
Is DTC 41-21, 42-21, 43-21, and/or 44-21 indicated?
YES -
Go to Step 8 .
NO -
If any other DTCs are indicated, go to the indicated DTCs troubleshooting. If DTCs are not indicated, intermittent failure, the system is OK at this time.■
  1. Test-drive the vehicle. Drive the vehicle at 10 km/h (7 mph) for 20 seconds or more.
    NOTE: Drive the vehicle on a straight section of road, not on a lift.
  1. Check for DTCs with the HDS.
Is DTC 41-21, 42-21, 43-21, and/or 44-21 indicated?
YES -
Check for loose terminals in the VSA modulator-control unit 36P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit, then retest. If the VSA modulator-control unit was substituted, go to Step 1 .
NO -
If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.■