SFI SYSTEM (w/o Secondary Air Injection System), Diagnostic DTC:P2118/89

DTC Code DTC Name
P2118/89 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 (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 off. If repairs are made and the system returns to normal, turn the ignition switch to 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.

A01BEXIE04
DTC No. DTC Detection Conditions Trouble Areas
P2118/89

Open in Electronic Throttle Control System (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 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

A01BFKWE01

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.

PROCEDURE


  1. CHECK ETCS FUSE


    1. A01BBFOE01

      Remove the ETCS fuse from the engine room R/B No.2.

    2. Measure the ETCS fuse resistance.

      Resistance
      Below 1 Ω

    3. Reinstall the ETCS fuse.


    NG

    REPLACE ETCS FUSE

    OK

  2. INSPECT ECM (+BM VOLTAGE)


    1. A01BBIVE08

      Measure the voltage between the terminals of the ECM connectors.

      Voltage
      Tester Connections Specified Conditions
      +BM (B9-7) - E1 (D1-3) 9 to 14 V

    NG

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

    OK

    CHECK FOR INTERMITTENT PROBLEMS

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


    1. A01BFJSE01

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


      1. Remove the ETCS fuse from the engine room R/B No.2.

      2. Disconnect the B9 ECM connector.

      3. Measure the resistance.

        Resistance (Check for open)
        Tester Connections Specified Conditions
        ETCS fuse (2) - +BM (B9-7) Below 1 Ω
        Resistance (Check for short)
        Tester Connections Specified Conditions
        ETCS fuse (2) or +BM (B9-7) - Body ground 10 kΩ or higher

      4. Reinstall the ETCS fuse.

      5. Reconnect the ECM connector.

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


      1. Remove the ETCS fuse from the engine room R/B No.2.

      2. Disconnect the positive battery cable.

      3. Measure the resistance.

        Resistance (Check for open)
        Tester Connections Specified Conditions
        Positive battery cable - ETCS fuse (1) Below 1 Ω
        Resistance (Check for short)
        Tester Connections Specified Conditions

        Positive battery cable or ETCS fuse (1)

        - Body ground

        		 10 kΩ or higher

      4. Reinstall the ETCS fuse.

      5. Reconnect the positive battery cable.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM