Honda HR-V: DTC Troubleshooting 25-121, 26-121, 28-121: Sensor (Inside of Modulator-Control Unit) Output Signal Malfunction

NOTE:

• Before you troubleshoot, review the general troubleshooting information.
• 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 these codes.

1. Problem verification:

1. Turn the vehicle to the ON mode.
2. Clear the DTC with the HDS.
3. Turn the vehicle to the OFF (LOCK) mode.
4. Test-drive the vehicle at 9 mph (15 km/h) or more.

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

5. Check for DTCs with the HDS.

Is DTC 25-121, 26-121, or 28-121 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.
3. Test-drive the vehicle at 9 mph (15 km/h) or more.

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

4. Check for DTCs with the HDS.

Is DTC 25-121, 26-121, or 28-121 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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