P0505

DTC P0505 IDLE AIR CONTROL SYSTEM CIRCUIT DESCRIPTION

CIRCUIT DESCRIPTION

DTC Detection Condition:

The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is comprised of: 1) a one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the Throttle position sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position sensor, which detects the accelerator pedal position; 5) the ECM, which controls the ETCS. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

The ECM detects idle speed and idle air flow amount for Idle Speed Control (ISC). The ECM concludes that the ISC is malfunctioning if: 1) the learned value of the ISC remains at the maximum or minimum 5 times or more during drive cycle, and 2)while driving at 10 km/h (6 mph) or more, the actual idle RPM varies from the target RPM by -200 to -100 RPM or 100 to 200 RPM 5 times or more during a drive cycle.

Example: If the actual idle RPM varies from the target idle RPM by more than 200 rpm* five times during a drive cycle, the ECM will turn on the MIL and a DTC is set.

HINT: *: RPM threshold varies with engine load.

Step 1-4:

INSPECTION PROCEDURE

HINT:
- The detection of DTC P0505 may also be caused by: 1) the floor carpet overlapping onto the accelerator pedal, causing the accelerator pedal to be slightly depressed (throttle position to be slightly open); or 2) the accelerator pedal not being fully released.
- Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was LEAN or RICH, and other data from the time the malfunction occurred.