Toyota Fortuner. Dtc P0505 Idle Control System Malfunction

CHECK OTHER DTC OUTPUT (BESIDES DTC P0505)

DTC P0505 Idle Control System Malfunction

DESCRIPTION

The idle speed is controlled by the Electronic Throttle Control System (ETCS).
ETCS is composed of the throttle motor to operate the throttle valve and the throttle position sensor to detect the opening angle of the throttle valve, the accelerator pedal position sensor to detect the accelerator pedal position, the ECM to control the ETCS, and the one valve type throttle body.
The ECM controls the throttle motor to provide the proper throttle valve opening angle for target idle speed.

DTC No.	DTC Detection Condition	Trouble Area
P0505	Idle speed continues to vary greatly from target speed (2 trip detection logic)	ETCS Air induction system PCV hose connection ECM

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent 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.

1.CHECK OTHER DTC OUTPUT (BESIDES DTC P0505)

Connect the intelligent tester to the DLC3.

Turn the ignition switch ON and turn the tester ON.

Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.
Result:
Display (DTC output)
Proceed to
Only P0505 is output
A
P0505 and other DTCs are output
B
HINT:
If any other codes besides P0505 are output, perform troubleshooting for those DTCs first.

GO TO RELEVANT DTC CHART

A

2.CHECK CONNECTION OF PCV HOSE

REPAIR OR REPLACE PCV HOSE

OK

3.CHECK AIR INDUCTION SYSTEM

Check for vacuum leaks in air induction system.

REPAIR OR REPLACE AIR INDUCTION SYSTEM

REPAIR OR REPLACE ELECTRONIC THROTTLE CONTROL SYSTEM

Display (DTC output)	Proceed to
Only P0505 is output	A
P0505 and other DTCs are output	B