Honda HR-V: 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.
1. Problem verification:
- Park the vehicle on a flat and level surface.
- Turn the vehicle to the ON mode.
- Clear the DTC with the HDS.
- Turn the vehicle to the OFF (LOCK) mode, then the ON mode.
- Test-drive the vehicle at 6 mph (10 km/h) or more.
NOTE: Drive the vehicle on the road, not on a lift.
- Check for DTCs with the HDS.
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):
- Update the VSA modulator-control unit if it does not have the latest
software.
- Turn the vehicle to the OFF (LOCK) mode, then the ON mode.
- Test-drive the vehicle at 6 mph (10 km/h) or more.
NOTE: Drive the vehicle on the road, not on a lift.
- Check for DTCs with the HDS.
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.
READ NEXT:
NOTE:
Troubleshoot any PGM-FI, AT or CVT DTCs first.
Before you troubleshoot, review the general troubleshooting information.
VSA will set 83-11 if any PGM -FI DTC's exist.
VSA will set 83-12 if
NOTE: Before you troubleshoot, review the general troubleshooting
information.
1. Problem verification:
Turn the vehicle to the ON mode.
Clear the DTC with the HDS.
Turn the vehicle to the OFF (
NOTE:
Before you troubleshoot, review the general troubleshooting information.
Refer to the DTC code shown on the display, and then inspect the
connectors and terminals based on the
instructions
SEE MORE:
HOW TO TROUBLESHOOT THE VSA SYSTEM
System Indicator
This system has four indicators:
ABS indicator (A)
VSA indicator (B)
VSA OFF indicator (C)
Automatic brake hold system indicator (D)
Automatic brake hold indicator (E)
Brake system indicator (red) (F)
Brake system indicator (amber) (G)
Wh
P Position
Hydraulic pressure is not applied to the forward clutch and the reverse
brake. Power is not transmitted to the secondary drive gear. The driven pulley
is locked by the park pawl interlocking the park
gear.
N Position
Engine power transmitted from the torque converter drives the input sh