DTC P050A, P050B: Cold Start Idle Air Control System Performance; Cold Start Ignition Timing Performance: Description
WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
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 DESCRIPTION TABLE
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| P050A | Accumulated intake air amount during 10 seconds of idling after cold start is less than threshold (2 trip detection logic) |
|
| P050B | Ignition timing retard value is insufficient for 5 seconds or more during 10 seconds of P050A monitoring at cold start (2 trip detection logic) |
|