Honda HR-V Owners & Service Manuals

Honda HR-V: DTC Troubleshooting 81-20: Acceleration Sensor (Inside of Modulator-Control Unit) Internal Circuit Malfunction

Honda HR-V (2015-2021) Service Manual / Brakes / VSA System - Diagnostics / DTC Troubleshooting / DTC Troubleshooting 81-20: Acceleration Sensor (Inside of Modulator-Control Unit) Internal Circuit Malfunction

NOTE:

  • Before you troubleshoot, review the general troubleshooting information.
  • While doing this troubleshooting, avoid vibration or shaking of the vehicle.
  • The yaw rate-acceleration sensor is built into the VSA modulator-control unit.
  • Before troubleshooting, check the VSA modulator-control unit for proper mounting. Improper mounting of the VSA modulator-control unit may set this code.

VSA System - Diagnostics

1. Problem verification:

  1. Park the vehicle on a flat and level surface.
  2. Turn the vehicle to the ON mode.
  3. Clear the DTC with the HDS.
  4. Turn the vehicle to the OFF (LOCK) mode, then the ON mode.
  5. Test-drive the vehicle at 6 mph (10 km/h) or more.

NOTE: Drive the vehicle on the road, not on a lift.

  1. Check for DTCs with the HDS.

VSA System - Diagnostics

Is DTC 81-20 indicated?

YES

The failure is duplicated. Go to step 2.

NO

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.

2. VSA modulator-control unit check (update):

  1. Update the VSA modulator-control unit if it does not have the latest software.
  2. Turn the vehicle to the OFF (LOCK) mode, then the ON mode.
  3. Test-drive the vehicle at 6 mph (10 km/h) or more.

NOTE: Drive the vehicle on the road, not on a lift.

  1. Check for DTCs with the HDS.

VSA System - Diagnostics

Is DTC 81-20 indicated?

YES

Check for loose terminals in the VSA modulator-control unit 21P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit.

NO

Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

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