Fail Safe Function

When the ECM fails to operate properly due to a malfunctioning EFI system sensor or an excessive drop in battery voltage, this system takes a back-up measure for proper operation. This back-up system is called the failsafe function.
In case of a coolant temperature sensor malfunction, the failsafe system will override the ECM control and input a signal to maintain a temperature of 176°F.
In case of throttle position sensor failure, the failsafe system will override the ECM control and input a signal to maintain about 25° of throttle opening.
In case of an intake air temperature sensor failure, the failsafe system will override the ECM control and input a signal to maintain a temperature of 68°F.
In case of an excessively high turbocharger pressure, the failsafe system will override the ECM control and input a signal to execute the exhaust fuel cutout operation.
In case of an air flow failure, the failsafe system will override the ECM control and input a signal to allow the fuel to be injected at the specified value equal to the normal value.
If no ignition signal is sent to the ECM for 2 seconds after the starter switch is turned ``On,'' the failsafe system will override the ECM control and input a signal to execute the fuel cut operation.
If battery voltage drops excessively and the ECM fails to operate properly, the failsafe system will override the ECM control and input a signal to inject the fuel at a specified value, equal to the average value.