P2111 Throttle Actuator Control System - Stuck Open DTC P2112 2ZR-FXE

DTC P2111 Throttle Actuator Control System - Stuck Open

DTC P2112 Throttle Actuator Control System - Stuck Closed

Description

Monitor description

Monitor strategy

Typical enabling conditions

Typical malfunction thresholds

Confirmation driving pattern

FAIL-SAFE

Wiring diagram

Inspection procedure

Check any other dtcs output (in addition to dtc p2111 or p2112)

Inspect throttle body assembly (visually check throttle valve)

Read value using intelligent tester (throttle position)

Replace throttle body assembly

Check whether dtc output recurs (dtc p2111 or 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 assembly. The throttle position sensor provides feedback to the ECM so that the ECM can control the throttle actuator (throttle valve) appropriately in response to driver inputs.

HINT:

This electronic throttle control system does not use a throttle cable.

DTC No. DTC Detection Condition Trouble Area
P2111 Throttle actuator does not close even when the ECM commands it to close (1 trip detection logic).
  1. Throttle actuator
  2. Throttle body assembly
  3. Throttle valve
  4. ECM
  5. Wire harness or connector
P2112 Throttle actuator does not open even when the ECM commands it to open (1 trip detection logic).
  1. Throttle actuator
  2. Throttle body assembly
  3. Throttle valve
  4. ECM
  5. Wire harness or connector

Monitor description

The ECM determines that there is a malfunction in the electronic throttle control system 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

Required Sensors/Components (Main) Throttle actuator (throttle body assembly)
Frequency of Operation Continuous

Typical enabling conditions

All
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
P2111 (Throttle Actuator Stuck Open)
All of the following conditions are met -
Throttle actuator current 2 A or higher
Duty cycle to close throttle 80% or more
P2112 (Throttle Actuator Stuck Closed)
All of the following conditions are met -
Throttle actuator current 2 A or higher
Duty cycle to open throttle 80% or more

TYPICAL MALFUNCTION THRESHOLDS

Throttle position sensor voltage No change

Confirmation driving pattern

Lexus DTC P2111 P2112 Confirmation driving pattern
  1. Connect the intelligent tester to the DLC3.
  2. Turn the power switch on (IG) and turn the tester on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the power switch off and wait for 30 seconds.
  5. Turn the power switch on (IG) and turn the tester on [A].
  6. Put the engine in inspection mode (maintenance mode) .
  7. Start the engine and fully depress and release the accelerator pedal quickly (to fully open and close the throttle valve).
  8. Enter the following menus: Powertrain / Engine and ECT / DTC [B].
  9. Read the pending DTCs.

    HINT:

    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.
  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  11. Input the DTC: P2111 or P2112.
  12. Check the DTC judgment result.
    Tester Display Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    HINT:

    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to electronic throttle control system 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 5.5° throttle angle by the return spring. The ECM stops the engine and the vehicle can be driven using solely the hybrid system. 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 power switch is then turned off.

Wiring diagram

Refer to DTC P2102

Inspection procedure

HINT:

  1. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.
  2. Refer to "Data List / Active Test" [Throttle Position Command, Throttle Position No. 1, Throttle Motor Current, Throttle Motor Duty (Open), Throttle Motor Duty (Close)] .

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. 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
 
OK  
   

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

  1. Check for contamination between the throttle valve and housing. If necessary, clean the throttle body assembly. Also, check that the throttle valve moves smoothly.

    OK:

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

  NG  
Go to step 4
 
OK  
   

3.READ VALUE USING INTELLIGENT TESTER (THROTTLE POSITION)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Clear the DTCs .

  1. Turn the power switch off and wait for at least 30 seconds.

  1. Turn the power switch on (IG) and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Throttle Position No. 1, Throttle Position No. 2 and Throttle Position Command.

  1. Check the values displayed on the tester while wiggling the ECM wire harness.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. 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

*: As the DTC was stored due to a change in the contact resistance of the connector, repair or replace the wire harness or connector .

  B  
Go to step 5
 
A  
   
REPAIR OR REPLACE HARNESS OR CONNECTOR

4.REPLACE THROTTLE BODY ASSEMBLY

  1. Replace the throttle body assembly .

NEXT  
   

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Clear the DTCs .

  1. Put the engine in inspection mode (maintenance mode) .

  1. Start the engine, and then fully depress and release the accelerator pedal quickly.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

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