Antilock Brakes / Traction Control Systems: Service Precautions

Precautions in Diagnosing Troubles
To ensure that the trouble diagnosis is done accurately and smoothly, observe the following and follow "ABS Check:".
^ If the vehicles was operated in any of the following ways, ABS warning lamp may light momentarily but this does not indicate anything abnormal in ABS.
- The vehicle was driven with parking brake pulled.
- The vehicle was driven with brake dragging.
- The vehicle was stuck in mud, sand, etc.
- Wheel spin occurred while driving.
- Wheel(s) was rotated while the vehicle was jacked up.
^ Be sure to read "Precautions for Electrical Circuit Service: " before inspection and observe what is written there.
^ Be sure to use the trouble diagnosis procedure as described in "ABS Check:". Failure to follow it may result in incorrect diagnosis. (Some other diagnosis trouble code may be stored by mistake in the memory of ABS control module during inspection.)





^ When disconnecting ABS hydraulic unit/control module connector (1), pull up lock (2) of connector. When connecting, set the connector on ABS hydraulic unit/control module assembly and push the lock (2) down.


Precautions in On-Vehicle Service
When connector is connected to ABS hydraulic unit/control module assembly, do not disconnect connectors of sensors with ignition switch ON. Then DTC will be set in ABS control module.