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. When the monitored voltage (+BM) is low (less than 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, turn the engine switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.

Tech Tips

The ETCS does not use a throttle cable.

A01GIN3E26
DTC No. DTC Detection Condition Trouble Area
P2118

Open in ETCS power source (+BM) circuit

(1 trip detection logic)

  • Open in ETCS power source circuit


  • 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 sets the DTC.

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

FAIL-SAFE

When this DTC, 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, and the throttle valve is returned to a 7° 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 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 engine switch is then turned off.

WIRING DIAGRAM

A01GIFHE15

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.

PROCEDURE


  1. CHECK FUSE (ETCS)


    1. A01GNXYE01

      Remove the ETCS fuse from the engine room No. 2 junction block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      ETCS fuse Always Below 1 Ω

    NG

    CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

    OK

  2. INSPECT ECM (+BM VOLTAGE)


    1. A01GNPIE06

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

      Standard voltage
      Tester Connection Condition Specified Condition
      E1-1 (+BM) - E3-1 (E1) Always 11 to 14 V

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY)


    1. A01GK8ZE01

      Check the harness and connector between the ETCS fuse and ECM.


      1. Remove the ETCS fuse from the engine room No. 2 junction block.

      2. Disconnect the E1 ECM connector.

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

        Standard resistance (Check for open)
        Tester Connection Condition Specified Condition
        ETCS fuse (2) - E1-1 (+BM) Always Below 1 Ω
        Standard resistance (Check for short)
        Tester Connection Condition Specified Condition
        ETCS fuse (2) or E1-1 (+BM) - Body ground Always 10 kΩ or higher

    2. Check the harness and connector between the ETCS fuse and positive battery cable.


      1. Remove the ETCS fuse from the engine room No. 2 junction block.

      2. Disconnect the positive battery cable.

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

        Standard resistance (Check for open)
        Tester Connection Condition Specified Condition
        Positive battery cable - ETCS fuse (1) Always Below 1 Ω
        Standard resistance (Check for short)
        Tester Connection Condition Specified Condition
        Positive battery cable or ETCS fuse (1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here