Monitor Description

This monitor will run when the engine is started at an engine coolant temperature of -10 to 50°C (14 to 122°F). The DTC is stored after the engine idles for 13 seconds (2 trip detection logic).

The 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. The MIL is illuminated and a DTC is stored when the malfunction is detected in consecutive driving cycles (2 trip detection logic).

NOTE:

The idle speed control learned values are cleared by performing a learned 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.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P050B	Cold Start Ignition Timing Performance	Insufficient ignition timing retard at 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 Wire harness or connector ECM	Comes on	DTC stored