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 it opens and closes the throttle valve.

The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. The sensor provides feedback to the ECM for controlling the throttle actuator, which adjusts the throttle valve opening in response to the driving conditions.

If this DTC is detected, the ECM shuts down the power for the throttle actuator, and the throttle valve is locked at a predetermined opening angle by the return spring. Also, all electronically controlled throttle operations are canceled until the system returns to normal and the ignition switch is turned OFF.

Tech Tips

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

DTC No. DTC Detection Condition Trouble Area
P2102/41

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


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

  • (b) Throttle actuator current is 0.5 A or less

  • Open in throttle actuator circuit

  • Throttle actuator

  • ECM
P2103/41

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


  • Throttle actuator current is 10 A or more for 0.1 seconds

  • Throttle actuator current is 7 A or more for 0.6 seconds

  • Short in throttle actuator circuit

  • Throttle actuator

  • Throttle valve

  • Throttle body assembly

  • ECM

MONITOR DESCRIPTION

The ECM monitors the flow of electrical current through the electronic throttle actuator, and detects malfunctions or open circuits in the throttle actuator based on the value of the electrical current. When the current deviates from the standard values, the ECM concludes that there is a fault in the throttle actuator. Or, if the throttle valve is not functioning properly (for example, stuck ON) the ECM concludes that there is a fault and illuminates the MIL and sets a DTC.

Example:

The current is more than 10 A, or the current is less than 0.5 A when the actuator driving duty ratio exceeds 80%. The ECM concludes that the current deviates from the standard values, turns on the MIL and a DTC is set.

This monitor runs after the engine is started, idled for 5 seconds and then quickly revved at a high rpm several times.

FAIL-SAFE

If the ETCS is malfunctioning, the ECM cuts off the current to the throttle actuator. The throttle control valve returns to a predetermined throttle position (approximately 6.5°) by the force of the return spring.

Then, required engine power is calculated using the ignition timing and accelerator pedal position. The engine is controlled by intermittent fuel-cut.

If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven at minimum speed. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically.

WIRING DIAGRAM

A01J42OE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions 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.

PROCEDURE


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

    A01J5BVE07

    1. Disconnect the T1 throttle body connector.

    2. Measure the resistance of the throttle actuator.

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

    NG

    REPLACE THROTTLE BODY ASSEMBLY

    OK

  2. CHECK WIRE HARNESS (THROTTLE ACTUATOR - ECM)

    A01J6KAE02

    1. Disconnect the T1 throttle body connector.

    2. Disconnect the E11 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      T1-2 (M+) - E11-5 (M+) Below 1 Ω
      T1-1 (M-) - E11-4 (M-) Below 1 Ω
      T1-2 (M+) or E11-5 (M+) - Body ground 10 kΩ or higher
      T1-1 (M-) or E11-4 (M-) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  3. INSPECT THROTTLE BODY ASSEMBLY


    1. Visually check for foreign objects between the throttle valve and housing.

      Also, check that the valve can open and close smoothly.

      OK
      Throttle valve is not contaminated with foreign objects and can move smoothly.

    NG

    REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY

    OK

    REPLACE ECM