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 using the HDS (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.
Disconnect the VSA modulator-control unit 47P connector, the steering angle sensor 5P connector, and the 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 & 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 Continuity Between VSA Modulator-Control Unit 47P Connector Terminal No. 35 & 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, and recheck.