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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-213 CIRCUIT OPERATION • 5-volt voltage is applied to the engine coolant temperature sensor output terminal (terminal No. • The engine coolant temperature sensor is a neg- ative temperature coefficient type of resistor. It • The engine coolant temperature sensor output voltage increases when the resistance increases . TECHNICAL DESCRIPTION • The engine coolant temperature sensor converts the engine coolant temperature to a voltage and • The ECM checks whether this voltage is within a specified range. . DESCRIPTIONS OF MONITOR METHODS • Engine coolant temperature sensor output volt- age drops from over 40° C (104° F) to under 40° C (104° F) and keeps under 40° C (104° F) for 5 minutes. • Engine coolant temperature sensor output volt- age does not reach close loop enable tempera- . MONITOR EXECUTION Continuous . MONITOR EXECUTION CONDITIONS Other Monitor (There is no temporary DTC stored in memory for the item monitored below) • Not applicable Sensor (The sensor below is determined to be normal) • Mass airflow sensor . |