DTC 21-11: Right-Front Magnetic Encoder Malfunction (Pulse Missing); DTC 22-11: Left-Front Magnetic Encoder Malfunction (Pulse Missing); DTC 23-11: Right-Rear Magnetic Encoder Malfunction (Pulse Missing); DTC 24-11: Left-Rear Magnetic Encoder Malfunction (Pulse Missing)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

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 12 mph (20 km/h) or more, and go a distance of 328 ft (100 m) or more.
NOTE: Drive the vehicle on the road, not on a lift.
Check for DTCs with the HDS.
Is DTC 21-11, 22-11, 23-11, or 24-11 indicated?

YES -Go to step 6.

NO -Intermittent failure, the system is OK at this time. Check for loose terminals between the wheel speed sensor 2P connector and the VSA modulator-control unit 36P connector. Refer to INTERMITTENT FAILURES TROUBLESHOOTING .
Turn the ignition switch to LOCK (0).

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

SYMPTOM CHART

DTC	Appropriate Magnetic Encoder	Note
21-11	Right-Front	Remove the front hub bearing unit (see KNUCKLE/HUB BEARING UNIT REPLACEMENT ).
22-11	Left-Front
23-11	Right-Rear	Remove the rear hub bearing unit (see KNUCKLE/HUB BEARING UNIT REPLACEMENT ).
24-11	Left-Rear

Is the magnetic encoder surface OK?

YES -Remove the debris from the magnetic encoder, or replace the hub bearing unit:

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

NO -Clean debris from the appropriate magnetic encoder surface on the hub bearing unit, then go to step 1 and recheck. If the DTC is still present, replace the appropriate hub bearing unit.