SFI SYSTEM, Diagnostic DTC:P2118

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

DESCRIPTION

The Electronic Throttle Control System (ETCS) has a dedicated power supply circuit, whose voltage (+BM) is monitored. When the voltage is low (less than 4 V), the ECM concludes that the ETCS has a fault, and the current to the throttle control motor is cut.

When the voltage becomes unstable, the ETCS becomes unstable. For this reason, when the voltage is low, the current to the motor is cut. After repairs are made and the system has returned to normal, turn the ignition switch OFF. The ECM then allows current to flow to the actuator and the motor can be restarted.

Tech Tips

The ETCS does not use a throttle cable.

DTC No. DTC Detection Condition Trouble Area
P2118

Open in ETCS power source 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 Malfunction Indicator Lamp (MIL) and sets the DTC.

This motor runs for 5 seconds (the first 5 seconds of engine idle) after the engine is started.

FAIL-SAFE

If the ETCS is malfunctioning, the ECM cuts off the current to the throttle actuator. The throttle control valve returns to a predetermined throttle position (approximately 6°) by the force of the return spring.

Then, required engine power is calculated using the ignition timing and accelerator pedal position. The engine is controlled by intermittent fuel cut.

If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven at minimum speed. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically.

WIRING DIAGRAM

Refer to DTC P2102 Click here.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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)

    A01J5ABE04

    1. Remove the ETCS fuse from the engine room relay block and junction block.

    2. Measure the resistance of the ETCS fuse.

      Standard resistance
      Below 1 Ω

    NG

    CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE

    OK

  2. CHECK ECM (+BM VOLTAGE)

    A01J6AVE22

    1. Measure the voltage of the ECM connectors.

      Standard voltage
      Tester Connection Specified Condition
      E14-7 (+BM) - E17-1 (E1) 9 to 14 V

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

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

    A01J7LME06

    1. Disconnect the E14 ECM connector.

    2. Remove the ETCS fuse from the engine room relay block and junction block.

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

    4. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      E14-7 (+BM) - Relay block ETCS fuse terminal 2 Below 1Ω
      Junction block ETCS fuse terminal 1 - Positive (+) battery cable Below 1Ω
      E14-7 (+BM) or Relay block ETCS fuse terminal 2 - Body ground 10 kΩ or higher
      Junction block ETCS fuse terminal 1 or Positive (+) battery cable - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM