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

DTC Code	DTC Name
P050500	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 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	Note
P050500	Idle Control System	The idle speed differs largely from the target idle speed (2 trip detection logic).	Electronic throttle control system Intake system PCV hose connection EGR valve assembly ECM	Comes on	DTC stored	SAE Code: P0505

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 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 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

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
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
(b) Idle control feedback correction amount	-7 Nm or less, or 10 Nm or more
(c) Vehicle condition	Stopped after being driven at 10 km/h (6 mph) or more
D. Amount of change Idle control correction value	-12.09 Nm or less, or 7.16 Nm or more

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG) [A].
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).

Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the A/C switch and all the accessories off [B].
Turn the power switch off and wait for at least 30 seconds.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Reconnect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).

Click here
Start the engine and rev the engine for 5 seconds or more with the park (P) selected [C].
Idle the engine for 5 minutes or more [D].

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 [E].
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 is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.
If the judgment result is INCOMPLETE or N/A, perform steps [F] through [I].

With the engine running, accelerate the vehicle to 10 km/h (6 mph) or more [F].

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Tech Tips

If the engine stops, further depress the accelerator pedal to restart the engine.
Stop the vehicle and rev the engine for 5 seconds or more with the park (P) selected [G].
Idle the engine for 20 seconds or more [H].
Repeat the steps [F] through [H] 10 times.
Enter the following menus: Powertrain / Engine / Trouble Codes [I].
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 is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.

CAUTION / NOTICE / HINT

Note

After turning power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

Click here

Tech Tips

The following conditions may also cause DTC P050500 to be stored:

If the floor carpet or floor mat is resting slightly on the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open.
The accelerator pedal is not fully released.

Refer to "Data List / Active Test" [Engine Speed 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 P050500)

Connect the GTS to the DLC3.
Turn the power 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.

GO TO DTC CHART Click here

CHECK PCV HOSE CONNECTIONS

Check the PCV hose connections.

Tech Tips

Click here

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

Result

Proceed to
OK
NG

REPAIR OR REPLACE PCV HOSE

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Click here

OK
No leaks from the intake system.

Result

Proceed to
OK
NG

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

PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

Tech Tips

The A/C switch and all accessories should be off.

Tester Display
Inspection Mode

Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure, EGR Step Position and Engine Independent.

Powertrain > Engine > Active Test

Active Test Display
Control the EGR Step Position

Data List Display
Intake Manifold Absolute Pressure
EGR Step Position
Engine Independent

Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

Note

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
Do not open the EGR valve 30 steps or more during the Active Test.

OK
The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed

Tech Tips

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Result

Result	Proceed to
The value of Intake Manifold Absolute Pressure increases by 10 kPa(abs) or more, compared to when the EGR valve was fully closed (0 step)	OK
Other than above	NG

Tech Tips

10 kPa = 1.45 psi

GO TO STEP 6 Click here

INSPECT EGR VALVE ASSEMBLY

Remove the EGR valve assembly.

Tech Tips

Click here

Check if the EGR valve is stuck open.

OK
EGR valve is tightly closed.

Result

Proceed to
OK
NG

REPLACE EGR VALVE ASSEMBLY Click here Perform "Inspection After Repair" after replacing the EGR valve assembly. Click here

INSPECT THROTTLE BODY ASSEMBLY (THROTTLE VALVE)

Check the throttle body assembly condition.

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

Result

Proceed to
OK
NG

REPLACE THROTTLE BODY ASSEMBLY Click here Perform "Inspection After Repair" after replacing the throttle body assembly. Click here

CLEAR DTC

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

Powertrain > Engine > Clear DTCs

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

Result

Proceed to
NEXT

CONFIRM WHETHER DTC OUTPUT RECURS (DTC P050500)

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

Read the pending DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
P050500 is output	B

END

REPLACE ECM Click here