Scantool Diagnostics

4WD Control
U0121 Lost Communication With Anti-Lock Brake System (ABS) Control Module - Scantool Diagnostics

Monitor Scantool Data

1. Connect scantool to Data Link Connector(DLC).
2. Self-diagnose 4WD ECM with scantool.
3. Check the change of each wheel speed sensor's value according to the change of vehicle speed.
4. If the sensor's value is stuck, self-diagnose ABS ECM with scantool. So if there are any DTCs related to the sensor, inspect it at first and check if the DTCs have been erased.
5. In a case that there is no DTC, select "RPM" item among the service data.
6. Check the change of the sensor's value according to a vehicle's speed.

Specification :It varies according to a vehicle's speed.








Fig.1) Wheel Speed Velocity(4WD)
Fig.2) Wheel Speed Sensor(ABS)
7. Is parameter displayed within specifications?