Lexus ES: Idle Control System (P050500)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / Idle Control System (P050500)

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 Code: 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

Related DTCs	P0505: Idle speed control system functional check
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
Duration	5 seconds
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

P0010, P0020 (VVT oil control solenoid bank 1, 2)

P0011, P0021 (VVT system bank 1, 2 - advance)

P0012, P0022 (VVT system bank 1, 2 - retard)

P0013, P0023 (Exhaust VVT oil control solenoid bank 1, 2)

P0014, P0024 (Exhaust VVT system bank 1, 2 - advance)

P0015, P0025 (Exhaust VVT system bank 1, 2 - retard)

P0016, P0018 (VVT system bank 1, 2 - misalignment)

P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment)

P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater)

P0101, P0102, P0103 (Mass air flow meter)

P0116, P0117, P0118 (Engine coolant temperature sensor)

P011B (Engine coolant temperature/intake air temperature sensor correlation)

P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, P2195, P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256 (Air fuel ratio sensor)

P0171, P0172, P0174, P0175 (Fuel system)

P0300 - P0306 (Misfire)

P0335, P0337, P0338 (Crankshaft position sensor)

P0340, P0342, P0343, P0345, P0347, P0348 (Camshaft position sensor)

P0351 - P0356 (Igniter)

P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust camshaft position sensor)

P0500 (Vehicle speed sensor)

P0657, P2102, P2103, P2111, P2112, P2119 (Throttle actuator)

P0705 (Shift lever position switch)

P11EA, P11EB, P11EC, P11ED, P11EE, P11EF, P11F0, P11F1, P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1 (Air-fuel ratio imbalance)

Engine

Running

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	-12.25 Nm or less, or 30 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)	-5 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	-21.25 Nm or less, or 21.25 Nm or more

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream 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) [A].
Turn the Techstream on.
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].
Idle the engine for 5 minutes or more [C].
HINT:

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.
HINT:
- 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.

Techstream 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

HINT:

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, perform steps [E] through [F].
[A] to [D]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

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.
HINT:
- 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.

Techstream 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

HINT:

If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.
[A] to [F]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

HINT:

The following conditions may also cause DTC P050500 to be stored:
1. 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.
2. The accelerator pedal being not fully released.
Refer to "Data List / Active Test" [Engine Speed, ISC F/B Torque and ISC F/B Learn Torque].
Click here
Read freeze frame data using the Techstream. 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

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

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

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

HINT:

If any DTCs other than P050500 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	CHECK PCV HOSE CONNECTIONS

(a) Check the PCV hose connections.

Click here

OK:

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

REPAIR OR REPLACE PCV HOSE

3.	CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here

OK:

No leaks from the intake system.

HINT:

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

Click here

REPAIR OR REPLACE INTAKE SYSTEM

4.	INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE VALVE)

(a) Check the throttle body with motor assembly condition.

OK:

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

HINT:

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

Click here

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Clear the DTC.

Powertrain > Engine > Clear DTCs

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

6.	CHECK WHETHER DTC OUTPUT RECURS (DTC P050500)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

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

END

REPLACE ECM

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