DTC Advanced Diagnostics: P050A (3.0L Engine)
DTC P050A: Cold Start Idle Air Control System Performance Problem
General Description
The quick warm-up system increases airflow and retards ignition timing to accelerate the warm-up of the catalyst on cold engine start. The powertrain control module (PCM) compares the measured airflow amount with the requested airflow amount during the quick warm-up. If the measured airflow deviates from the requested air amount, the powertrain control module (PCM) detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 10 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | |
|---|---|
| Quick warm-up | On |
Malfunction Threshold
Measured airflow amount - (minus) requested airflow amount is more than +20 %, or less than -20 % for at least 10 seconds.
Possible Cause
- Intake air duct breakage
- Intake air duct misinstalled
- Air cleaner breakage
- Air cleaner damage
- Air cleaner clogged
- Throttle body clogged
- Intake air system clogged
Confirmation Procedure
Operating Condition
- Leave the vehicle until the engine coolant temperature [ECT Sensor 1] lowers to 86 deg.F (30 deg.C) or less.
- Start the engine, and let it idle for at least 15 seconds.
[ ]: HDS Parameter
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC, the freeze data, and the on-board snapshot are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.