Toyota Venza: Throttle Actuator Control System - Stuck Open (P2111,P2112)

DESCRIPTION

The throttle actuator is operated by the ECM, and opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT:

This Electronic Throttle Control System (ETCS) does not use a throttle cable.

DTC No.	DTC Detection Condition	Trouble Area
P2111	The ECM signals the throttle actuator to close, but the actuator is stuck (1 trip detection logic).	Throttle actuator Throttle body Throttle valve ECM Wire harness or connector
P2112	The ECM signals the throttle actuator to open, but the actuator is stuck (1 trip detection logic).	Throttle actuator Throttle body Throttle valve ECM Wire harness or connector

MONITOR DESCRIPTION

The ECM determines that there is a malfunction in the ETCS when the throttle valve remains at a fixed angle despite a high drive current from the ECM. The ECM illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	P2111: Throttle Actuator Stuck Open P2112: Throttle Actuator Stuck Closed
Required Sensors/Components (Main)	Throttle actuator (throttle body)
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	0.5 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All:

Monitor runs whenever following DTCs not stored

None

P2111 (Throttle Actuator Stuck Open):

All of following conditions are met:	-
System guard* judge condition	ON
Throttle actuator current	2 A or higher
Duty-cycle to close throttle	80% or more

P2112 (Throttle Actuator Stuck Closed):

All of following conditions are met:	-
System guard* judge condition	ON
Throttle actuator current	2 A or higher
Duty-cycle to open throttle	80% or more

*: System guard is ON when following conditions are met:	-
Throttle actuator	ON
Throttle actuator duty calculation	Executing
Throttle position sensor fail	Not detected
Throttle actuator current-cut operation	Not executing
Throttle actuator power supply	4 V or higher
Throttle actuator fail	Not detected

TYPICAL MALFUNCTION THRESHOLDS

P2111 (Throttle Actuator Stuck Open):

Throttle position sensor voltage

No change

P2112 (Throttle Actuator Stuck Closed):

Throttle position sensor voltage

No change

CONFIRMATION DRIVING PATTERN

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions, is stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 6° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM

Refer to DTC P2102 (See page ).

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2111 OR P2112)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Read the DTCs.

Result

Result	Proceed to
DTC P2111 or P2112 is output	A
DTC P2111 or P2112 and other DTCs are output	B

HINT:

If any DTCs other than P2111 or P2112 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.	INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

(a) Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body. And check that the throttle valve moves smoothly.

OK:

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

NG

GO TO STEP 5

OK

3.	READ VALUE USING TECHSTREAM (THROTTLE POSITION)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs (See page ).

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

(f) Turn the ignition switch to ON.

(g) Enter the following menus: Powertrain / Engine / Data List / Throttle Position No. 1, Throttle Position No. 2 and Throttle Position Command.

(h) Check the values displayed on the Techstream while wiggling the ECM wire harness.

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

(j) Check for DTCs.

Result

Result	Proceed to
Value in Data List changes when wire harness is wiggled, or DTC is output	A
Other than above	B

B

GO TO STEP 6

A

4.	REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - THROTTLE BODY)

(a) As the DTC was stored due to a change in the contact resistance of the connector, repair or replace the wire harness or connector (See page ).

NEXT

END

5.	REPLACE THROTTLE BODY ASSEMBLY

(a) Replace the throttle body assembly (See page ).

HINT:

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

NEXT

6.	CHECK WHETHER DTC OUTPUT RECURS (DTC P2111 OR P2112)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs (See page ).

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

(f) Start the engine, and then fully depress and release the accelerator pedal quickly to fully open and close the throttle valve.

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

(h) Read the DTCs.

Result	Proceed to
DTC is not output	A
DTC P2111 or P2112 is output	B

A

END

B

REPLACE ECM