P2112

3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2111: Throttle Actuator Control System - Stuck Open

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 it 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 to control the throttle actuator and set the throttle valve angle in response to driver inputs.
HINT: The Electronic Throttle Control System (ETCS) does not use a throttle cable.





MONITOR DESCRIPTION

The ECM concludes 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 will illuminate the MIL and set a DTC.
To activate the monitor, start the engine and fully depress/fully release the accelerator pedal quickly (fully open/fully close the throttle valve).

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





P2111 (Throttle actuator stuck open):





P2112 (Throttle actuator stuck closed):









TYPICAL MALFUNCTION THRESHOLDS

P2111 (Throttle actuator stuck open):





P2112 (Throttle actuator stuck closed):





FAIL-SAFE

If the ETCS has a malfunction, the ECM cuts off current to the throttle actuator. The throttle valve returns to a predetermined opening angle (approximately 7°) by the force of 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 enable the vehicle to continue at a minimal speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal.

WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 OTHER DTC OUTPUT
Result:






B -- GO TO RELEVANT DTC CHART
A -- Continue to next step.
2. CHECK THROTTLE BODY (VISUALLY CHECK THROTTLE VALVE)
(a) Check for foreign matter between the throttle valve and housing. If necessary, clean the throttle body.
Also, check that the throttle valve moves smoothly.
OK:
No foreign matter between the throttle valve and the housing, and throttle valve can move smoothly.
NG -- REPLACE THROTTLE BODY
OK -- Continue to next step.
3. CHECK DTC OUTPUT
(a) Clear the DTC.
(b) Start the engine, and fully depress/fully release the accelerator pedal quickly (fully open/fully close the throttle valve).
(c) Read the DTC.
Result:






B -- REPLACE ECM
A -- CHECK FOR INTERMITTENT PROBLEM