P2112

2UZ-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 motor 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 motor and set the throttle valve angle in response to driver inputs.
HINT: This Electronic Throttle Control System (ETCS) does not use a throttle cable.





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 sets a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All:





P2111:





P2112:





TYPICAL MALFUNCTION THRESHOLDS





FAIL-SAFE

When any of these DTCs, as well as other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions are set, 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





INSPECTION PROCEDURE
HINT: 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

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 ON and turn the tester ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read the DTCs.
Result:





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

B -- GO TO RELEVANT DTC CHART
A -- Continue to next step.
2. CHECK THROTTLE WITH MOTOR BODY ASSEMBLY (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 WITH MOTOR BODY ASSEMBLY
OK -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P2111 OR P2112)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Clear the DTC DTC Check / Clear.
(d) Start the engine, and depress and release the accelerator pedal quickly (fully open and close the throttle valve).
(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(f) Read DTC.
Result:






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