DTC 81: Central Processing Unit (CPU)

Turn the ignition switch ON (II).
Check for the fuel and emission systems (PGM-FI) DTCs with the HDS (see GENERAL TROUBLESHOOTING INFORMATION ).
Are any ECM/PCM DTCs indicated?

YES - Do the appropriate troubleshooting for the DTC.

NO - Go to step 3.
Clear the DTC with the HDS.
Turn the ignition switch OFF, then disconnect the HDS.
Test-drive the vehicle.
Check for DTCs with the HDS.
Is DTC 81 indicated?

YES - Go to step 8.

NO - The vehicle is OK at this time. Refer to INTERMITTENT FAILURE .
Turn the ignition switch OFF.
Disconnect the VSA modulator-control unit 47P connector, the steering angle sensor 5P connector, and yaw rate-lateral acceleration sensor 5P connector.
Start the engine.
Measure the voltage between VSA modulator-control unit 47P connector terminal No. 35 and body ground.

Fig 1: Measuring Voltage Between VSA Modulator-Control Unit 47P Connector Terminal No. 35 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 0.1 V or more?

YES - Repair short to power in the wire between the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, and the steering angle sensor.

NO - Go to step 11.
Check for continuity between VSA modulator-control unit 47P connector terminal No. 35 and body ground.

Fig 2: Checking Continuity Between VSA Modulator-Control Unit 47P Connector Terminal No. 35 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short to body ground in the wire between the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, and the steering angle sensor.

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 retest.