Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GHAR
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 03/2019]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P2102,P2103; Throttle Actuator Control Motor Circuit Low; 2020 MY Corolla [01/2019 - 03/2019]

DTC

P2102

Throttle Actuator Control Motor Circuit Low

DTC

P2103

Throttle Actuator Control Motor Circuit High

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. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P2102

Throttle Actuator Control Motor Circuit Low

Both of the following conditions are met for 2.0 seconds (1 trip detection logic):

  • The throttle actuator drive duty cycle is 80% or higher.
  • The throttle actuator current is less than 0.5 A.
  • Open in throttle actuator circuit
  • Throttle actuator
  • ECM

Comes on

DTC stored

P2103

Throttle Actuator Control Motor Circuit High

One of the following conditions is met (1 trip detection logic):

  • A motor driver IC high current limiter monitor input malfunction is detected.
  • A motor driver IC high current inhibit signal is received.
  • Short in throttle actuator circuit
  • Throttle actuator
  • Throttle valve
  • Throttle body assembly
  • ECM

Comes on

DTC stored

MONITOR DESCRIPTION

The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on this value. If the current is outside the standard range, the ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does not function properly (for example, stuck on), the ECM determines that there is a malfunction. The ECM then illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P2102: Electronic throttle actuator control motor current (low current)

P2103: Electronic throttle actuator control motor current (high current)

Required Sensors/Components (Main)

Throttle actuator (throttle body assembly)

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

2 seconds: P2102

25 times: P2103 (Case 1)

0.6 seconds: P2103 (Case 2)

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

None

P2102

All of the following conditions are met

-

Command to electronic throttle actuator

On

Output duty cycle

80% or higher

Electronic throttle actuator power supply voltage

8 V or higher

Motor current change during last 0.016 seconds

Less than 0.2 A

P2103

All of the following conditions are met

-

Battery voltage

Off

Command to electronic throttle actuator

On

Either of the following conditions is met

1 or 2

1. Electronic throttle actuator power supply voltage

8 V or higher

2. Command to electronic throttle actuator power

On

TYPICAL MALFUNCTION THRESHOLDS

P2102

Motor current

Less than 0.5 A

P2103 (Case 1)

Motor driver IC high current limiter monitor input

Fail

P2103 (Case 2)

Motor driver IC high current inhibit signal

On

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON [A].
  7. Turn the Techstream on.
  8. Start the engine.
  9. With the vehicle stationary, fully depress the accelerator pedal and quickly release it [B].
  10. Check that 16 seconds or more have elapsed from the instant when the accelerator pedal is first depressed.
  11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
  12. 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.
  13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  14. Input the DTC: P2102 or P2103.
  15. 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

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [C] again.
  16. If no pending DTC is output, perform a universal trip and check for permanent DTCs.

    Click here 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: 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 these DTCs are 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 valve opening 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 off.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

  • The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Duty (Open) / Throttle Motor Duty (Close)) can be read using the Techstream. However, the ECM shuts off the throttle actuator current when the electronic throttle control system malfunctions.
  • 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.

INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)

(a) Inspect the throttle body assembly.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): THROTTLE BODY: INSPECTION

HINT:

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

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE THROTTLE BODY ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (THROTTLE BODY ASSEMBLY - ECM)

(a) Disconnect the throttle body assembly connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C20-2 (M+) - C77-60 (M+)

Always

Below 1 Ω

C20-1 (M-) - C77-30 (M-)

Always

Below 1 Ω

C20-2 (M+) or C77-60 (M+) - Body ground and other terminals

Always

10 kΩ or higher

C20-1 (M-) or C77-30 (M-) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

(a) Check for foreign matter between the throttle valve and the housing.

OK:

No foreign matter between the throttle valve and housing.

HINT:

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

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY ASSEMBLY

OK

4.

INSPECT THROTTLE BODY ASSEMBLY (THROTTLE VALVE)

(a) Check if the throttle valve opens and closes smoothly.

OK:

Throttle valve opens and closes smoothly.

HINT:

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

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

OK

REPLACE ECM

NG

REPLACE THROTTLE BODY ASSEMBLY