P050A

DTC P050A Cold Start Idle Air Control System Performance

DESCRIPTION

DTC Detection Condition:

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 will set after the engine idles for 13 seconds (2 trip detection logic).

The DTC is designed to monitor the idle air control at cold start. When the engine is started at an engine coolant temperature of lower than 50 °C (122 °F), the ECM measures the accumulated mass air flow at engine idling. If it does not reach the specified level within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving cycles (2 trip detection logic).

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

NOTE: When the negative battery terminal is disconnected during inspections or repairs, the ISC (Idle Speed Control) learning values are cleared. This DTC cannot be set with the ISC learning values cleared.

HINT: The ISC learning is performed when the engine is warmed up and has been idling for 5 minutes.

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

MONITOR DESCRIPTION

Step 1:

Step 1(Continued)-3:

Step 4-7:

Step 7(Continued)-15:

Step 15(Continued):

INSPECTION PROCEDURE

HINT: Read freeze frame data using the intelligent tester or Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.