СИСТЕМА SFI, 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 engine switch is turned off.

Tech Tips

This ETCS does not use a throttle cable.

A00DSHZE27
DTC No. DTC Detection Condition Trouble Area
P2118 An open in the ETCS power source (+BM) circuit (1 trip detection logic).

  • Open in ETCS power source circuit

  • Battery

  • Battery terminals

  • ETCS fuse

  • ECM

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 6.5° 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. Fail-safe mode continues until a pass condition is detected and the engine switch is turned off.

WIRING DIAGRAM

A00DQNME01

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following 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, and other data from the time the malfunction occurred.

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (+BM VOLTAGE)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

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

    4. Read the value displayed on the tester.

      Standard voltage
      11 to 14 V
    NG

    CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

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

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

      A00DT52E01

      1. Remove the ETCS fuse from the engine room No. 1 relay block.

      2. Disconnect the A40 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
        2 (ETCS fuse) - A40-3 (+BM) Always Below 1 Ω
        Standard Resistance (Check for Short)
        Tester Connection Condition Specified Condition
        2 (ETCS fuse) or A40-3 (+BM) - Body ground Always 10 kΩ or higher
        Text in Illustration
        *1 ETCS fuse
        *2 Engine Room No. 1 Relay Block
        *3

        Front view of wire harness connector

        (to ECM)

      4. Reinstall the ETCS fuse.

      5. Reconnect the ECM connector.

    2. Check the harness and connector between the ETCS fuse and positive (+) battery terminal.

      1. Remove the ETCS fuse from the engine room No. 1 relay block.

      2. Disconnect the cable from the negative (-) battery terminal.

      3. Disconnect the cable from the positive (+) battery terminal.

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

        Standard Resistance (Check for Open)
        Tester Connection Condition Specified Condition
        Positive (+) battery terminal - 1 (ETCS fuse) Always Below 1 Ω
        Standard Resistance (Check for Short)
        Tester Connection Condition Specified Condition
        Positive (+) battery terminal or 1 (ETCS fuse) - Body ground Always 10 kΩ or higher

      5. Reinstall the ETCS fuse.

      6. Reconnect the cable to the positive (+) battery terminal.

      7. Reconnect the cable to the negative (-) battery terminal.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (+BM VOLTAGE)

    1. Disconnect the A40 and B39 ECM connectors.

      A00DTN3E37

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A40-3 (+BM) - B39-43 (ME01) Always 11 to 14 V
      A40-3 (+BM) - B39-104 (E1)
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

    3. Reconnect the ECM connectors.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here