SFI SYSTEM (w/o Secondary Air Injection System), Diagnostic DTC:P2102, P2103

DTC Code DTC Name
P2102 Throttle Actuator Control Motor Circuit Low
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. 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.

Tech Tips

This ETCS (Electronic Throttle Control System) does not use a throttle cable.

DTC No. DTC Detection Condition Trouble Area
P2102

Conditions (a) and (b) continue for 2.0 seconds (1 trip detection logic):

(a) Throttle actuator duty ratio is 80% or more.

(b) Throttle actuator current is below 0.5 A.


  • Open in throttle actuator circuit

  • Throttle actuator

  • ECM

P2103

Either condition is met (1 trip detection logic):


  • There is a hybrid IC diagnosis signal failure.

  • There is a hybrid IC current limiter port failure.


  • Short in throttle actuator circuit

  • Throttle actuator

  • Throttle valve

  • Throttle body assembly

  • ECM

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, if the throttle actuator is stuck on), the ECM determines that there is a malfunction. The ECM then illuminates the MIL and stores a DTC.

Example:

When the electrical current is below 0.5 A and the throttle actuator duty ratio is 80% or more, the ECM interprets this as the current being outside the standard range, illuminates the MIL and stores a DTC.

If the malfunction is not repaired successfully, a DTC is stored when the engine is quickly revved to a high engine speed several times after the engine is started and has idled for 5 seconds.

FAIL-SAFE

When either of these DTCs, or other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions 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 6.5° 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 position 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.

The ECM continues operating in fail-safe mode until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM

B007VE5E06

INSPECTION PROCEDURE

Tech Tips


  • Read freeze frame data using the intelligent tester. 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.


  • 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 intelligent tester. However, the ECM shuts off the throttle actuator current when the ETCS malfunctions.

PROCEDURE


  1. INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)


    1. B007URHE08
      Text in Illustration
      *a

      Component without harness connected

      (Throttle Body Assembly)

      Disconnect the throttle body assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (M+) - 1 (M-) 20°C (68°F) 0.3 to 100 Ω

    NG
    OK
  2. CHECK HARNESS AND CONNECTOR (THROTTLE ACTUATOR - ECM)


    1. Disconnect the throttle body assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D29-2 (M+) - D97-43 (M+) Always Below 1 Ω
      D29-1 (M-) - D97-42 (M-) Always Below 1 Ω
      D29-2 (M+) or D97-43 (M+) - Body ground Always 10 kΩ or higher
      D29-1 (M-) or D97-42 (M-) - Body ground Always 10 kΩ or higher

    NG
    OK
  3. INSPECT THROTTLE BODY ASSEMBLY


    1. Check for foreign objects between the throttle valve and the housing.

      OK
      No foreign objects between throttle valve and housing.

    NG
    OK
  4. INSPECT THROTTLE VALVE


    1. Check if the throttle valve opens and closes smoothly.

      OK
      Throttle valve opens and closes smoothly.

    NG
    OK