ES 300 V6-3.0L (3VZ-FE) (1992)
Fail Safe Operation Chart
OPERATION
During normal vehicle operation, the ECM controls fuel, spark and emission systems. In the event of a sensor failure or inconsistency the unit
switches to "Fail-Safe" mode. In this mode, certain sensor and output parameters become "fixed" allowing limited operation of the vehicle. In
most cases the malfunction indicator lamp (MIL) is illuminated and trouble codes are recorded in the ECM long term memory. This alerts the
operator that a system requires attention and guides the technician towards the failed system.