SFI SYSTEM, Diagnostic DTC:P2118

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

DESCRIPTION

The 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 electronic throttle control system and cuts off the current to the throttle actuator.

When the voltage becomes unstable, the electronic throttle control system 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.

Tip:

This electronic throttle control system does not use a throttle cable.

A141490E29

DTC No.

DTC Detection Condition

Trouble Area

P2118

An open in the electronic throttle control system power source (+BM) circuit (1 trip detection logic).

  • Open in electronic throttle control system power source circuit

  • Battery

  • Battery terminals

  • ETCS fuse

  • ECM

FAIL-SAFE

When this DTC or other DTCs relating to 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 5.5° 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 gently, the vehicle can be driven slowly. Fail-safe mode continues until a pass condition is detected and the ignition switch is turned off.

WIRING DIAGRAM

A342916E01

CAUTION / NOTICE / HINT

Note:

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

Tip:

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 and turn the GTS on.

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

    4. Read the value displayed on the GTS.

      Standard voltage

      11 to 14 V

    CHECK FOR INTERMITTENT PROBLEMS

    (Click here)

  2. CHECK HARNESS AND CONNECTOR (+BM CIRCUIT)

    1. U123366E02

      Disconnect the ECM connectors.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      C111-29 (+BM) - Body ground

      Always

      11 to 14 V
      Table 1. Text in Illustration

      *a

      Front view of wire harness connector

      (to ECM)

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

      Standard Resistance (Check for Open)

      Tester Connection

      Condition

      Specified Condition

      C111-28 (ME01) - Body ground

      Always

      Below 1 Ω

      C111-59 (E1) - Body ground

      Always

      Below 1 Ω

    4. Reconnect the ECM connectors.

    REPLACE ECM

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)