Monitor Description

A monitor will run when the engine is started at an engine coolant temperature of -10 to 50°C (14 to 122°F). If certain conditions are met, a DTC will be stored after the engine idles for 13 seconds (2 trip detection logic).

This DTC is designed to monitor the idle air control at cold start. When the engine is started at an engine coolant temperature of less than 50°C (122°F), the ECM measures the accumulated mass air flow during engine idling. If the accumulated mass air flow does not reach the specified level within 10 seconds, the ECM interprets this as a malfunction, illuminates the MIL and stores this DTC.

The electronic throttle control system controls the idle speed. The electronic throttle control system operates the throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle speed.

NOTE:

The idle speed control learned values are cleared by performing learning value reset. Idle speed control learning needs to be performed before this DTC can be stored.

HINT:

Idle speed control learning is performed when the engine is warmed up and has been idling for 5 minutes.

Fig 1: Detection Logic

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P050A-00	Cold Start Idle Control System Performance	Insufficient mass air flow after a cold start (2 trip detection logic).	Throttle body with motor assembly Mass air flow meter sub-assembly PCV system Air cleaner filter element sub-assembly Intake system VVT system EGR valve assembly Wire harness or connector ECM	Comes on	DTC stored	SAE Code: P050A