P050500

DTC Code	DTC Name
P050500	Idle Control System

DESCRIPTION

The idle speed is controlled by the ETCS (Electronic Throttle Control System). The ETCS is comprised of: 1) the 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; and 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.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P050500	Idle Control System	Idle speed continues to vary greatly from the target idle speed (2 trip detection logic).	Electronic throttle control system Intake system PCV hose connections ECM	Comes on	DTC stored	SAE: P0505

MONITOR DESCRIPTION

The ECM monitors the idle speed and idling air flow volume to conduct Idle Speed Control (ISC). The ECM determines that the ISC 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 idle control correction 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 idle control correction value is stuck at the upper or lower limit, or that the idle control correction 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

Continuous

TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met	1 or 2
1. Both of the following conditions A and B met	-
A. Engine speed - Target engine speed	Less than -100 rpm, or higher than 150 rpm (A/C off and NSW off) Less than -100 rpm, or higher than 200 rpm (A/C on or NSW on)
B. Idle control correction value	-7 Nm or less, or 15 Nm or more for 5 seconds or more
2. Both of the following conditions C and D met	-
C. Frequency that all of following conditions (a), (b) and (c) met	5 times or more
(a) Engine speed - Target engine speed	Less than -100 rpm, or higher than 150 rpm (A/C off and NSW off) Less than -100 rpm, or higher than 200 rpm (A/C on or NSW on)
(b) Idle control learning value (value when last idle)	-7 Nm or less, or 10 Nm or more
(c) Vehicle condition	Stopped after being driven at 10 km/h (6.25 mph) or more
D. Amount of change Idle control correction value	-12.1 Nm or less, or 7.15 Nm or more

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and 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) and 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: P050500.

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: P050500.

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.

CAUTION / NOTICE / HINT

Tech Tips

The following conditions may also cause DTC P050500 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.

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.
Refer to "Data List / Active Test" [Engine Speed, ISC F/B Torque and ISC F/B Learn Torque].

Click here

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050500)

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

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTC P050500 is output	A
DTC P050500 and other DTCs are output	B

Tech Tips

If any DTCs other than P050500 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 WITH MOTOR BODY ASSEMBLY (THROTTLE VALVE)

Check the throttle with motor body assembly condition.

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

Tech Tips

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

Click here

Result

Proceed to
OK
NG

NG

REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Click here

OK

CHECK WHETHER DTC OUTPUT RECURS (DTC P050500)

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.
Turn the engine switch on (IG).
Turn the GTS on.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTC P050500 is output	A
DTC is not output	B

A

REPLACE ECM Click here

B

END

SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P050500