Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

General Information


The ECM contains a built-in, self-diagnosis system that detects troubles within the engine signal network. Once a malfunction is detected, the ECM may turn on the instrument panel Malfunction Indicator Lamp (MIL), if certain malfunction parameters are met.

By analyzing various signals, the ECM detects system malfunctions related to the operating sensors. The ECM stores the failure code associated with the detected failure until the diagnosis system is cleared.

The MIL on the instrument panel informs the driver that a malfunction has been detected. The light will go out automatically once the malfunction has been cleared.