Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026EFT
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P050500; Idle Control System; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

DTC

P050500

Idle Control System

DESCRIPTION

The idle speed is controlled by the electronic throttle control system. The electronic throttle control system is comprised of: 1) one valve type throttle body assembly; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position sensor, which detects the accelerator pedal position; 5) the ECM, which controls the electronic throttle control system. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P050500

Idle Control System

The idle speed differs largely from the target idle speed (2 trip detection logic).

  • Electronic throttle control system
  • Intake system
  • PCV hose connection
  • EGR valve assembly
  • ECM

Comes on

DTC stored

  • SAE Code: P0505
  • DTC for Mexico Models: Does not apply

MONITOR DESCRIPTION

The ECM monitors the idle speed and idling air flow volume to conduct idle speed control. The ECM determines that the idle speed control system is malfunctioning if either of the following conditions is met:

  • The difference between the target engine idle speed and actual engine idle speed exceeds the threshold and the idle control correction value is stuck at the upper or lower limit for 5 seconds or more.
  • After driving at a vehicle speed of 10 km/h (6.25 mph) or more, the difference between the target and actual engine idle speed exceeds the threshold 5 times or more during a driving cycle, and then the system determines that the idle control correction value is stuck at the upper or lower limit, or that the idle control correction value has been changed by an amount that exceeds the threshold.

MONITOR STRATEGY

Related DTCs

P0505: Idle speed control system functional check

Required Sensors/Components (Main)

Electronic throttle control system

Required Sensors/Components (Related)

Crankshaft position sensor

Engine coolant temperature sensor

Frequency of Operation

Continuous

Duration

5 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

P0010 (Camshaft timing oil control valve)

P0011 (VVT system - advance)

P0012 (VVT system - retard)

P0016 (VVT system - misalignment)

P0031, P0032, P101D (Air fuel ratio sensor heater)

P0101, P0102, P0103 (Mass air flow meter)

P0107, P0108 (Manifold absolute pressure)

P0116, P0117, P0118 (Engine coolant temperature sensor)

P011B (Engine coolant temperature/intake air temperature sensor correlation)

P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor)

P0171, P0172 (Fuel system)

P0300 - P0304 (Misfire)

P0335 (Crankshaft position sensor)

P0340, P0342, P0343 (Camshaft position sensor)

P0351 - P0354 (Igniter)

P0400 (EGR system)

P0401 (EGR system (closed))

P1452, P1453 (EVAP system)

P0657, P0658, P2102, P2103, P2111, P2112, P2119 (Throttle actuator)

P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance)

P2228, P2229 (Atmospheric pressure sensor)

Engine

Running

TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met

1 or 2

1. Both of the following conditions A and B met

-

A. Engine speed - Target engine speed

Less than -100 rpm, or higher than 150 rpm

B. Idle control correction value

-7 Nm or less, or 30 Nm or more for 5 seconds or more

2. Both of the following conditions C and D met

-

C. Frequency that all of following conditions (a), (b) and (c) met

5 times or more

(a) Engine speed - Target engine speed

Less than -100 rpm, or higher than 150 rpm

(b) Idle control feedback correction amount

-7 Nm or less, or 10 Nm or more

(c) Vehicle condition

Stopped after being driven at 10 km/h (6.25 mph) or more

D. Amount of change Idle control correction value

-20.34 Nm or less, or 15.41 Nm or more

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off and wait for at least 30 seconds.
  6. Turn the power switch on (IG) [A].
  7. Turn the Techstream on.
  8. Put the engine in Inspection Mode (Maintenance Mode).

    Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

  9. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the A/C switch and all the accessories off [B].
  10. Turn the power switch off and wait for at least 30 seconds.
  11. Disconnect the cable from the negative (-) auxiliary battery terminal.
  12. Reconnect the cable to the negative (-) auxiliary battery terminal.
  13. Turn the power switch on (IG).
  14. Turn the Techstream on.
  15. Put the engine in Inspection Mode (Maintenance Mode).

    Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

  16. Start the engine and rev the engine for 5 seconds or more with the park (P) selected [C].

    HINT:

    During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [C] after charge control has completed.

  17. Idle the engine for 5 minutes or more [D].

    HINT:

    In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.

  18. Enter the following menus: Powertrain / Engine / Trouble Codes [E].
  19. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  20. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  21. Input the DTC: P050500.
  22. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system is malfunctioning.
    • If the judgment result shows INCOMPLETE, perform steps [F] through [I].
    • [A] to [E]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
  23. With the engine running, accelerate the vehicle to 10 km/h (6 mph) or more [F].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    If the engine stops, further depress the accelerator pedal to restart the engine.

  24. Stop the vehicle and rev the engine for 5 seconds or more with the park (P) selected [G].

    HINT:

    During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [G] after charge control has completed.

  25. Idle the engine for 20 seconds or more [H].
  26. Repeat the steps [F] through [H] 10 times [I].
  27. Enter the following menus: Powertrain / Engine / Trouble Codes [J].
  28. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  29. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  30. Input the DTC: P050500.
  31. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system is malfunctioning.
    • [A] to [J]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

NOTICE:

  • Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

    Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): VEHICLE CONTROL HISTORY (RoB)

    (Select Powertrain in Health Check and then check the time stamp data.)

    Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): VEHICLE CONTROL HISTORY (RoB)

  • After turning power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

HINT:

  • The following conditions may also cause DTC P050500 to be stored:
    1. If the floor carpet or floor mat is resting slightly on the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open.
    2. The accelerator pedal is not fully released.
  • Refer to "Data List / Active Test" [Engine Speed and ISC Learning Value].

    Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DATA LIST / ACTIVE TEST

  • 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 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 P050500)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P050500 is output

A

DTC P050500 and other DTCs are output

B

HINT:

If any DTCs other than P050500 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

CHECK PCV HOSE CONNECTIONS

(a) Check the PCV hose connections.

Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; 2ZR-FXE (EMISSION CONTROL): PCV VALVE: COMPONENTS

OK:

PCV valve and hose are connected correctly and are not damaged.

NG

REPAIR OR REPLACE PCV HOSE

OK

3.

CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (INTAKE / EXHAUST): INTAKE SYSTEM: ON-VEHICLE INSPECTION

OK:

No leaks from the intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPAIR OR REPLACE INTAKE SYSTEM

OK

4.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in Inspection Mode (Maintenance Mode).

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(e) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

(f) Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Engine Independent.

Powertrain > Engine > Active Test

Active Test Display

Control the EGR Step Position

Data List Display

Intake Manifold Absolute Pressure

Engine Independent

(g) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

NOTICE:

  • Do not leave the EGR valve open for 10 seconds or more during the Active Test.
  • Be sure to return the EGR valve to step 0 when the Active Test is completed.
  • Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

-

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

  • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
  • While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
  • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.
OK

GO TO STEP 6

NG

5.

INSPECT EGR VALVE ASSEMBLY

(a) Remove the EGR valve assembly.

Click here 2023 MY Corolla Corolla HV [09/2022 - 11/2022]; 2ZR-FXE (EMISSION CONTROL): EGR VALVE: REMOVAL 2023 - 2025 MY Corolla Corolla HV [11/2022 -        ]; 2ZR-FXE (EMISSION CONTROL): EGR VALVE: REMOVAL

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

HINT:

Perform "Inspection After Repair" after replacing the EGR valve assembly.

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE EGR VALVE ASSEMBLY 2023 MY Corolla Corolla HV [09/2022 - 11/2022]; 2ZR-FXE (EMISSION CONTROL): EGR VALVE: REMOVAL 2023 - 2025 MY Corolla Corolla HV [11/2022 -        ]; 2ZR-FXE (EMISSION CONTROL): EGR VALVE: REMOVAL

OK

6.

INSPECT THROTTLE BODY ASSEMBLY (THROTTLE VALVE)

(a) Check the throttle body assembly condition.

OK:

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

HINT:

Perform "Inspection After Repair" after replacing the throttle body assembly.

Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE THROTTLE BODY ASSEMBLY

OK

7.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the power switch off and wait for at least 30 seconds.

NEXT

8.

CONFIRM WHETHER DTC OUTPUT RECURS (DTC P050500)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

(c) Read the pending DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P050500 is output

B

A

END

B

REPLACE ECM 2023 MY Corolla Corolla HV [09/2022 - 11/2022]; 2ZR-FXE (ENGINE CONTROL): ECM: REMOVAL 2023 - 2025 MY Corolla Corolla HV [11/2022 -        ]; 2ZR-FXE (ENGINE CONTROL): ECM: REMOVAL