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 is stored after the engine idles for 15 seconds (2 trip detection logic).

This DTC is designed to monitor the ignition timing at cold start. When the engine is started at an engine coolant temperature of less than 50°C (122°F), the ECM checks the ignition timing during engine idling. If the ignition timing advances beyond the specified level within 10 seconds, the ECM interprets this as a malfunction, illuminates the MIL and stores this DTC.

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.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P050B-00	Cold Start Ignition Timing Performance	Ignition timing insufficiently retarded at cold start (2 trip detection logic).	Throttle body 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: P050B DTC for Mexico Models: Does not apply