DTC 81: VSA Modulator-Control Unit Internal Circuit Malfunction

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Check for other system DTCs.
Are there other DTCs indicated?

YES -Do the appropriate troubleshooting for the DTC.

NO -Go to step 3.
Clear the DTC with the HDS.
Test-drive the vehicle at 19 mph (30 km/h) or more.
NOTE: Drive the vehicle on the road, not on a lift.
Check for DTCs with the HDS.
Is DTC 81 indicated?

YES -Go to step 6.

NO -Intermittent failure, the system is OK at this time.
Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).
Test-drive the vehicle at 19 mph (30 km/h) or more.
NOTE: Drive the vehicle on the road, not on a lift.
Check for DTCs with the HDS.
Is DTC 81 indicated?

YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ), 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 (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ). If any other DTCs are indicated, go to the INDICATED DTCS TROUBLESHOOTING .