DTC 21: Right-Front Magnetic Encoder Malfunction; DTC 22: Left-Front Magnetic Encoder Malfunction; DTC 23: Right-Rear Magnetic Encoder Malfunction; DTC 24: Left-Rear Magnetic Encoder Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM) ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Test-drive the vehicle at 19 mph (30 km/h) or more.
NOTE: Drive the vehicle on the of road, not on a lift.
Check for DTCs with the HDS.
Is DTC 21, 22, 23, or 24 indicated?

YES -Go to step 6.

NO -Intermittent failure, the system is OK at this time. Refer to INTERMITTENT FAILURES TROUBLESHOOTING .

Inspect the appropriate magnetic encoder for damage, debris, and correct installation.

DTC	Appropriate Magnetic Encoder	Note
21	Right-front	Remove the driveshaft outboard joint from the appropriate wheel hub (see KNUCKLE/HUB/WHEEL BEARING REPLACEMENT ).
22	Left-front
23	Right-rear	Remove the hub bearing unit (see HUB BEARING UNIT REPLACEMENT ).
24	Left-rear

Is the magnetic encoder surface OK?

YES -Go to step 7.

NO -Remove the debris from the magnetic encoder, or replace the wheel bearing (front) or the hub bearing unit (rear):

Front: Replace the front wheel bearing (see KNUCKLE/HUB/WHEEL BEARING REPLACEMENT ).
Rear: Replace the rear hub bearing unit (see HUB BEARING UNIT REPLACEMENT ).

Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE ).
Turn the ignition switch to LOCK (0).
Test-drive the vehicle at 19 mph (30 km/h) or more.
NOTE: Drive the vehicle on the road, not on a lift.
Check for DTCs with the HDS.
Is DTC 21, 22, 23, or 24 indicated?

YES -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).

NO -If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCS TROUBLESHOOTING .