P2112
2ZR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2111,P2112: Throttle Actuator Control System - Stuck Open
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. 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 ETCS (Electronic Throttle Control System) 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.
If the malfunction is not repaired successfully, a DTC is set 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
TYPICAL ENABLING CONDITIONS
All:
All::
P2111 (Throttle actuator stuck open):
P2111 (Throttle actuator stuck open)::
P2112 (Throttle actuator stuck closed):
P2112 (Throttle actuator stuck closed)::
TYPICAL MALFUNCTION THRESHOLDS
P2111 (Throttle actuator stuck open):
P2111 (Throttle actuator stuck open)::
P2112 (Throttle actuator stuck closed):
P2112 (Throttle actuator stuck closed)::
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on [A].
- Start the engine and fully depress and release the accelerator pedal quickly (to fully open and close the throttle valve).
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
- Read the DTCs.
HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P2111 or P2112.
- Check the DTC judgment result.
HINT
If the judgment result shows ABNORMAL, the system has a malfunction.
- If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
FAIL-SAFE
When either of these DTCs or other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, is 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 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 to OFF.
WIRING DIAGRAM
Refer to DTC P2102 P2102.
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. INSPECT THROTTLE BODY (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 -- REPAIR OR REPLACE THROTTLE BODY Removal
OK -- Continue to next step.
2. 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 DTC Check / Clear.
(e) Refer to the confirmation driving pattern for P2111 and P2112.
(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(g) Read the DTCs.
Result:
B -- REPLACE ECM Removal
A -- CHECK FOR INTERMITTENT PROBLEMS