SFI SYSTEM (w/o Secondary Air Injection System), Diagnostic DTC:P2102/41, P2103/41

DTC Code DTC Name
P2102/41 Throttle Actuator Control Motor Circuit Low
P2103/41 Throttle Actuator Control Motor Circuit High

DESCRIPTION

The throttle actuator is operated by the ECM and opens and closes the throttle valve using the 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 the driver

Tech Tips

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

DTC No. DTC Detection Conditions Trouble Areas
P2102/41

  • Conditions (a) and (b) continue for 2.0 seconds

    (1 trip detection logic):


    1. Throttle actuator duty ratio 80 % or more

    2. Throttle actuator current 0.5 A or less

  • Open in throttle actuator circuit

  • Throttle actuator

  • ECM
P2103/41

  • Either of following conditions is met:


    • Hybrid IC diagnosis signal fail

    • Hybrid IC current limiter port fail

  • 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, stuck on), the ECM determines that there is a malfunction. The ECM then illuminates the MIL and sets a DTC.

Example:

When the electrical current is more than 10 A, or less than 0.5 A and the throttle actuator duty ratio exceeds 80 %, the ECM interprets this as the current being outside the standard range, and illuminates the MIL and sets a DTC.

If the malfunction is not repaired successfully, a DTC is set when the engine is quickly revved to a high rpm several times after the engine has idled for 5 seconds after engine start.

FAIL-SAFE

When either of these DTCs, as well as 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 off, 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 opening angle, to allow the vehicle to continue at a minimal speed.

If the accelerator pedal is fully depressed slowly, 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

A01BHTLE01

INSPECTION PROCEDURE

Tech Tips


  • Read freeze frame data using an 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

  • The throttle actuator current (Throttle Mot) and the throttle actuator duty ratio (Throttle Opn / Throttle Cls) can be read using an intelligent tester. However the ECM shuts off the throttle actuator current when the ETCS malfunctions.

PROCEDURE


  1. INSPECT THROTTLE W/MOTOR BODY ASSEMBLY (THROTTLE ACUTATOR RESISTANCE)


    1. A01BGDDE05

      Disconnect the D29 throttle body connector.

    2. Measure the resistance between the terminals of the throttle body.

      Resistance
      Tester Connections Specified Conditions
      M+ (2) - M- (1) 0.3 to 100 Ω at 20°C (68°F)

    3. Reconnect the throttle body connector.


    NG

    REPLACE THROTTLE W/MOTOR BODY ASSEMBLY

    OK

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


    1. A01BA5RE02

      Disconnect the D29 throttle body connector.

    2. Disconnect the D1 ECM connector.

    3. Measure the resistance.

      Resistance (Check for open)
      Tester Connections Specified Conditions
      M+ (D29-2) - M+ (D1-5) Below 1 Ω
      M- (D29-1) - M- (D1-4) Below 1 Ω
      Resistance (Check for short)
      Tester Connections Specified Conditions
      M+ (D29-2) or M+ (D1-5) - Body ground 10 kΩ or higher
      M- (D29-1) or M- (D1-4) - Body ground 10 kΩ or higher

    4. Reconnect the throttle body connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT THROTTLE W/MOTOR BODY ASSEMBLY


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


    NG

    REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY

    OK

  4. INSPECT THROTTLE VALVE


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


    NG

    REPLACE THROTTLE W/MOTOR BODY ASSEMBLY

    OK

    REPLACE ECM