Toyota 2GR-FE Manual page 452

ES–296
DTC
DESCRIPTION
The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is comprised of:
1) 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.
DTC No.
P0505
ES
MONITOR DESCRIPTION
The ECM monitors the idling speed and idling air flow volume to conduct Idle Speed Control (ISC). The
ECM determines that the ISC system is malfunctioning if the following conditions are met:
• The learned idling air flow volume remains at the maximum or minimum 5 times or more during a
driving cycle
• While driving at 6 mph (10 km/h) or more, the actual engine idling speed varies from the target idling
speed by between 100 rpm and 200 rpm, 5 times or more during a driving cycle.
Example:
If the actual idling speed varies from the target idling speed by more than 200 rpm* 5 times during a
driving cycle, the ECM illuminates the MIL and sets the DTC.
HINT:
*: Threshold idling speed varies with engine load.
Example
Idling Speed
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
P0505 Idle Control System Malfunction
DTC Detection Condition
Idle speed continues to vary greatly from target speed
(2 trip detection logic)
Target Speed
Actual Idling Speed
• ETCS
• Air induction system
• PCV hose connection
• ECM
Learned Idling Air Volume
Large
0
Small
Time
Trouble Area
Maximum
Minimum
Time
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