SFI SYSTEM, Diagnostic DTC:P2118

DTC Code DTC Name
P2118 Throttle Actuator Control Motor Current Range / Performance

DESCRIPTION

The ETCS (Electronic Throttle Control System) has a dedicated power supply circuit. The voltage (+BM) is monitored and when it is low (below 4 V), the ECM determines that there is a malfunction in the ETCS and cuts off the current to the throttle actuator.

When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, the ECM then allows the current to flow to the throttle actuator so that it can be restarted after the ignition switch is turned off.

Tech Tips

This ETCS does not use a throttle cable.

B001Y35E02
DTC No. DTC Detection Condition Trouble Area
P2118 Open in the ETCS power source (+BM) circuit (1 trip detection logic).

  • Open in ETCS power source circuit

  • Battery

  • Battery terminals

  • ETCS fuse

  • ECM

MONITOR DESCRIPTION

The ECM monitors the battery supply voltage applied to the throttle actuator.

When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this as an open in the power supply circuit (+BM). The ECM illuminates the MIL and stores the DTC.

If the malfunction is not repaired successfully, the DTC is stored 5 seconds after the engine is next started.

FAIL-SAFE

When this DTC 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 7° 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 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 turned off.

WIRING DIAGRAM

Refer to DTC P2102 Click here.

CAUTION / NOTICE / HINT

Note

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

Tech Tips

Read freeze frame data using the GTS. 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.

PROCEDURE


  1. READ VALUE USING GTS (+BM VOLTAGE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / +BM Voltage.

    5. Read the value displayed on the GTS.

      Result
      Result Proceed to
      Below 11 V or higher than 14 V A
      11 to 14 V B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. CHECK HARNESS AND CONNECTOR (ECM - BATTERY, BODY GROUND)

    B001Y1AC02
    *A for Manual transmission models
    *B for Automatic transmission models
    *a

    Front view of wire harness connector

    (to ECM)

    1. Disconnect the ECM connector.

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

      Standard Voltage
      for Manual Transmission Models
      Tester Connection Condition Specified Condition
      C45-41 (+BM) - Body ground Always 11 to 14 V
      for Automatic Transmission Models
      Tester Connection Condition Specified Condition
      C45-104 (+BM) - Body ground Always 11 to 14 V

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

      Standard Resistance
      for Manual Transmission Models
      Tester Connection Condition Specified Condition
      C45-81 (E1) - Body ground Always Below 1 Ω
      C45-82 (ME01) - Body ground Always Below 1 Ω
      for Automatic Transmission Models
      Tester Connection Condition Specified Condition
      C45-81 (E1) - Body ground Always Below 1 Ω
      C45-18 (ME01) - Body ground Always Below 1 Ω

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR