DTC 81: Central Processing Unit (CPU)

Check for other DTCs.
Is another DTC indicated?
1. YES - Do the appropriate troubleshooting for the DTC.
2. NO - Go to step 2.
Clear the DTC (see HOW TO CLEAR DTCS ).
Disconnect the HDS from the 16P DLC.
Turn the ignition switch OFF, then turn it ON (II) again.
Test-drive the vehicle.
Does the ABS indicator come on, and is DTC 81 indicated?
1. YES - Go to step 6.
2. NO - Intermittent failure; the vehicle is OK at this time. Refer to INTERMITTENT FAILURES .
Disconnect the VSA modulator-control unit 47P connector, steering angle sensor 5P connector, and yaw rate-lateral acceleration sensor 5P connector.
Start the engine.
Measure the voltage between the 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?
1. 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.
2. NO - Go to step 9.
Check for continuity between the VSA modulator-control unit 47P connector terminal No. 35 and body ground.

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

Is there continuity?
1. 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.
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.