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HOMESERVICE MANUALSACURA2003MDX TOURINGREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLVSA (VEHICLE STABILITY ASSIST) SYSTEMDTC TROUBLESHOOTINGDTC 71: DIFFERENT DIAMETER TIRE
2003 Acura MDX Touring

DTC 71: Different Diameter Tire

2003 Acura MDX TouringSECTION DTC 71: Different Diameter Tire
  1. Clear the DTC, and disconnect the HDS (see HOW TO CLEAR DTCS  ).
  2. Turn the ignition switch OFF, then turn it ON (II) again.
  3. Test-drive the vehicle.

    Does the VSA indicator come on, and is DTC 71 indicated? 

    1. YES  - Go to step 4.
    2. NO  - Intermittent failure; confirm that tire inflation is set to door jamb sticker specification. The vehicle is OK at this time. Refer to INTERMITTENT FAILURES  .
  4. Check that all four tires are the specified size and are inflated to the proper specification per door jamb sticker specification.

    Are all four tires the correct size and properly inflated? 

    1. YES  - Go to step 5.
    2. NO  - Install the correct tires or set the tires to the correct inflation and retest.
  5. With the car on level ground, mark the front tires with a small spot of grease. Roll the car until each of the tires makes two grease spots on the floor.
  6. Measure and record the distance between the two grease spots. Wipe up the grease spots, then repeat steps  5 and 6 with the rear tires.

    Is the distance between the shortest and the longest measurement more than 10%? 

    1. YES  - Replace the tire/tires that is smaller or larger than the others.
    2. NO  - Check for loose terminals in the VSA modulator-control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION  ) and recheck.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.