Advanced Diagnostics

Advanced Diagnostics

DTC P050A: Cold Start Idle Air Control System Performance Problem










General Description
The quick warm-up system supplies additional air and retards the ignition timing when the engine is cold to activate the catalytic converter as quickly as possible.When the actual amount of air is less than the target amount, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status







Enable Conditions







Malfunction Threshold
The total airflow is decreased by a factor of 0.550 for at least 10.0 seconds. Confirmation Procedure with the HDS Do the ETCS TEST in the INSPECTION MENU with the HDS.

Driving Pattern
1. Allow the engine to cool to an ambient engine coolant temperature of 131 °F (55 °C) or less.
2. Start the engine, and let it idle for at least 10 seconds.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected during the first drive cycle with the ECT and IAT at engine start-up within the specified temperature range, a Temporary DTC is stored in the ECM/PCM memory. If the malfunction recurs during the next (second) drive cycle with the ECT and IAT at engine start-up within the specified temperature range, the MIL comes on and the DTC and the freeze frame data are stored.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs. The MIL, the DTC, the Temporary DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.