Precautions For on Board Diagnostic (OBD) System

The ECU (ECCS control module) also receives the A/T malfunction results and has an on board diagnostic system. It will light up the Malfunction Indicator Lamp (MIL) to warn the driver of a malfunction causing emission deterioration.

CAUTION:
- Be sure to turn the ignition system "OFF" and disconnect the negative battery terminal before the repair or inspection work. The open/short circuit of the related switches, sensors, solenoid valves, etc. will cause the MIL to light up.
- Be sure to connect and lock the connectors securely after the work. The loose (unlocked) connector will cause the MIL to light up due to the open circuit. (Ensure that connectors are clean and dry and that they have no bent terminals.)
- Be sure to route and clamp the harnesses properly after work. The interference of a harness with a bracket, etc. may cause the MIL to light up due to a short circuit.
- Be sure to erase the unnecessary (already fixed) malfunction information in the A/T control unit or ECM before returning the vehicle