Last Modified: 11-29-2007 1.6 C
Service Category: Engine/Hybrid System Section: Engine Control
Model Year: 2008 Model: Sequoia Doc ID: RM000000PFV06YX
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

P2111

Throttle Actuator Control System - Stuck Open

DTC

P2112

Throttle Actuator Control System - Stuck Closed

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 (TP) sensor, which is mounted on the throttle body. The TP sensor provides feedback to the ECM so that it can control the throttle actuator (throttle valve) appropriately in response to driver inputs.

HINT:

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

DTC No.

DTC Detection Condition

Trouble Area

P2111

Throttle actuator does not close when signaled by ECM

(1 trip detection logic)
  • Throttle actuator
  • Throttle body assembly
  • Throttle valve

P2112

Throttle actuator does not open when signaled by ECM

(1 trip detection logic)
  • Throttle actuator
  • Throttle body assembly
  • Throttle valve

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.

If the malfunction is not repaired successfully, a DTC is stored when the accelerator pedal is fully depressed and released quickly (to fully open and close the throttle valve) after the engine is next started.

MONITOR STRATEGY

Related DTCs

P2111: Throttle actuator stuck open

P2112: Throttle actuator stuck closed

Required Sensors/Components (Main)

Throttle actuator

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 present

None

System guard*

ON

*System guard is ON when the following conditions set

-

Throttle actuator

ON

Throttle actuator duty calculation

Executing

Throttle position sensor

Fail determined

Throttle actuator current-cut operation

Not executing

Throttle actuator power supply

4 V or higher

Throttle actuator

Fail determined

P2111 (Throttle Actuator Stuck Open)

All of following conditions met

-

Throttle actuator current

2 A or more

Duty cycle to close throttle

80% or more

P2112 (Throttle Actuator Stuck Closed)

All of following conditions met

-

Throttle actuator current

2 A or more

Duty cycle to open throttle

80% or more

TYPICAL MALFUNCTION THRESHOLDS

TP sensor voltage change

No change

FAIL-SAFE

When either of these DTCs, or other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, are 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 7° 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 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 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia)+ .

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. 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 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 and ECT / Trouble Codes.

(e) Read DTCs.

Result

Result

Proceed to

P2111 or P2112 is output

A

P2111 or P2112 and other DTCs are output

B

HINT:

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

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.

OK

3.

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 DTCs 3UR-FE ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

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

(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(g) Read DTCs.

Result

Result

Proceed to

No DTC is output

A

P2111 or P2112 is output

B
A