P0505

DTC Code	DTC Name
P0505	Idle Control System

DESCRIPTION

The idle speed is controlled by the electronic throttle control system. The electronic throttle control system is comprised of: 1) one valve type throttle body with motor assembly; 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 electronic throttle control system. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0505	Idle Control System	Idle speed continues to vary greatly from target idle speed (2 trip detection logic).	Electronic throttle control system Intake system PCV hose connection ECM	Comes on	DTC stored

MONITOR DESCRIPTION

The ECM monitors the idle speed and idling air flow volume to conduct idle speed control. The ECM determines that the idle speed control system is malfunctioning if either of the following conditions is met:

The difference between the target engine idle speed and actual engine idle speed exceeds the threshold and the IAC flow rate learned value is stuck at the upper or lower limit for 5 seconds or more.
After driving at a vehicle speed of 10 km/h (6.25 mph) or more, the difference between the target and actual engine idle speed exceeds the threshold 5 times or more during a driving cycle, and then the system determines that the IAC flow rate learned value is stuck at the upper or lower limit, or that the IAC flow rate learned value has been changed by an amount that exceeds the threshold.

MONITOR STRATEGY

Required Sensors/Components (Main)

Electronic throttle control system

Required Sensors/Components (Related)

Crankshaft position sensor

Engine coolant temperature sensor

Vehicle speed sensor

Frequency of Operation

Once per driving cycle

TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions are met	1 or 2
1. Both of the following conditions are met	-
Engine speed - Target engine speed	Less than -100 rpm, or higher than 200 rpm (A/C on or NSW on) Less than -100 rpm, or higher than 150 rpm (A/C off and NSW off)
IAC flow rate learned value	2.37 L/sec. or less, or 11.29 L/sec. or more for 5 seconds or more
2. Both of the following conditions are met	A and B
A. Either of the following conditions (a) or (b) is met	5 times or more
(a) Engine speed - Target engine speed	Less than -100 rpm, or higher than 200 rpm (A/C on or NSW on) Less than -100 rpm, or higher than 150 rpm (A/C off and NSW off)
(b) Vehicle condition	Stopped after vehicle was driven by 10 km/h (6.25 mph) or higher
B. Either of the following condition is met	(c) or (d)
(c) Amount of change of IAC flow rate learning value	+2.84 L/sec. or more, or -4.51 L/sec. or less
(d) IAC flow rate learning value	2.37 L/sec. or less, or 11.29 L/sec. or more

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG).
Turn the GTS on [A].
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off [B].
Idle the engine for 5 minutes or more [C].

Tech Tips

In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
Read the pending DTCs.
Tech Tips
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P0505.

Check the DTC judgment result.

GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tech Tips

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [E] and [F].

Accelerate the vehicle to 10 km/h (6.25 mph) or more, and then idle the engine for 20 seconds or more [E].

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Repeat step [E] 5 times.
Enter the following menus: Powertrain / Engine / Trouble Codes [F].
Read the pending DTCs.
Tech Tips
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P0505.

Check the DTC judgment result.

GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tech Tips

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

CAUTION / NOTICE / HINT

Tech Tips

The following conditions may also cause DTC P0505 to be stored:

The floor carpet overlapping slightly onto the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open.
The accelerator pedal being not fully released.

Refer to "Data List / Active Test" [Engine Speed, ISC Feedback Value and ISC Learning Value].

Click here
Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

Read the DTCs.

Result

Result	Proceed to
DTC P0505 is output	A
DTC P0505 and other DTCs are output	B

Tech Tips

If any DTCs other than P0505 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART Click here

A

CHECK PCV HOSE CONNECTIONS

Check the PCV hose connections.

Click here

OK
PCV valve and hose are connected correctly and are not damaged.

Result

Proceed to
OK
NG

NG

REPAIR OR REPLACE PCV HOSE

OK

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Click here

OK
No leaks from the intake system.

Tech Tips

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

Result

Proceed to
OK
NG

NG

REPAIR OR REPLACE INTAKE SYSTEM

OK

INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE VALVE)

Check the throttle body with motor assembly condition.

OK
Throttle valve is not contaminated with foreign matter and moves smoothly.

Tech Tips

Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

Click here

Result

Proceed to
OK
NG

NG

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY Click here

OK

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0505)

Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

Read the pending DTCs.

Result

Result	Proceed to
DTC P0505 is output	A
DTCs are not output	B

A

REPLACE ECM Click here

B

END

SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P0505