Toyota Venza: Throttle / Pedal Position Sensor "A" Minimum Stop Performance (P2109)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Throttle / Pedal Position Sensor "A" Minimum Stop Performance (P2109)

DESCRIPTION

The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is comprised of a throttle actuator, which operates the throttle valve, and a throttle position sensor, which detects the opening amount of the throttle valve. The ECM controls the throttle actuator to adjust the throttle valve opening amount so that the idle speed is maintained at the target idle speed.

DTC No.	DTC Detection Condition	Trouble Area
P2109	The ISC learned value is approximately 3 times larger than normal even though the actual intake air amount during idling is within the normal range (up to 1.5 times the normal amount) (5 trip detection logic).	Throttle body

HINT:

The ISC learned value is the calculated intake air amount corresponding to the throttle opening amount necessary to maintain the idle speed.
This malfunction is only detected once per trip. After it has been detected once, the system will not monitor for the malfunction for the rest of the trip.
The system uses the throttle body and mass air flow meter sub-assembly to detect this malfunction.

MONITOR DESCRIPTION

If there are deposits in the throttle valve, a decrease in the ISC flow rate may cause engine stall or unstable idling. Therefore, the necessary ISC flow rate for idling is maintained using the ISC learned value and feedback. The ECM stores this DTC if the ISC learned value approaches its limit. The ECM begins monitoring for the DTC detection conditions when the following preconditions are met:

1) The mass air flow meter sub-assembly is normal.
2) Atmospheric pressure is 85 kPa(abs) [638 mmHg(abs)] or higher.
3) The vehicle has been driven at a speed of 30 km/h (18.6 mph) or more at least once.
4) The engine coolant temperature is 45°C (113°F) or less at engine start, the engine is warmed up and conditions for ISC learning are met, or the ignition switch has been turned to ON (include engine running) for 1 hour or more, the engine is warmed up and conditions for ISC learning are met.

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
Since a pending DTC is not stored for this DTC, it takes time to confirm whether the malfunction has been successfully repaired by checking for this DTC. When confirming whether the malfunction has been successfully repaired, compare "ISC Learning Value" recorded in the freeze frame data with "ISC Learning Value" in the Data List after repairs have been made to save time.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2109)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

(e) Read the DTCs.

Result

Result	Proceed to
DTC P2109 is output	A
DTC P2109 and other DTCs are output	B

HINT:

If any DTCs other than P2109 are output, troubleshoot those DTCs first.

GO TO DTC CHART

2.	READ FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

HINT:

Be sure to confirm "ISC Learning Value" in the freeze frame data as it is used when confirming whether the malfunction has been successfully repaired.

3.	REMOVE FOREIGN OBJECT (CLEAN THROTTLE BODY)

(a) Clean off any deposits from the inside of the throttle body.

Text in Illustration

*1	Bore
*2	Valve
*a	Reference
*b	Throttle Body Cross-section Diagram
*c	When valve fully opened
*d	Deposits
*e	Do not directly apply cleaner

(1) Push open the throttle valve and wipe off any carbon from the valve and bore using a cloth soaked in non-residue solvent.

NOTICE:

Make sure that the cloth or your fingers do not get caught in the valve.
Make sure that foreign matter does not enter the throttle valve.
Do not directly apply non-residue solvent to the throttle body or wash the throttle body. Cleaning solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems.
If there is coating material on the edge of the valve, be careful not to remove it.
Push the throttle valve open gently with your finger and check that the throttle valve moves smoothly.

HINT:

If the throttle valve does not open smoothly, replace the throttle body.

4.	READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

(a) Perform "Inspection After Repair" after cleaning the throttle body (See page ).

(b) Connect the Techstream to the DLC3.

(d) Enter the following menus: Powertrain / Engine / Data List / Primary / ISC Learning Value.

(e) Read the value.

OK:

The value is half of "ISC Learning Value" recorded in the freeze frame data or less.

HINT:

Perform "Inspection After Repair" after replacing the throttle body (See page ).

END

REPLACE THROTTLE BODY

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