The Electronic Throttle Control System (ETCS) controls the engine idling speed. The ETCS operates the throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idling speed.

In addition, the ECM retards the ignition timing and the ETCS increases the intake air amount to quickly increase the catalyst temperature at cold start to reduce emissions.


DTC Detection Conditions

Trouble Areas


Accumulated intake air amount during 10 seconds of idling after cold start, less than threshold (2 trip detection logic)

• Throttle body assembly

• Air induction system

• PCV hose connections

• Air cleaner filter element



Ignition timing retard value insufficient for 5 seconds or more during 10 seconds of P050A monitoring duration at cold start (2 trip detection logic)

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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