DTC    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 (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 ignition switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.

HINT:
The ETCS does not use a throttle cable.

A112629E01


DTC No.
DTC Detection Condition
Trouble Area
P2118
Open in ETCS (Electronic Throttle Control System) power source (+BM) circuit
(1 trip detection logic)
  1. Open in ETCS power source circuit
  2. Battery
  3. Battery terminals
  4. ETCS fuse
  5. 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 off the current to the throttle actuator, and the throttle valve is returned to a 6° 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 depressed firmly and gently, 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


A112581E03


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work (Click here).

HINT:
Read freeze frame data using the Techstream. 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.
1.READ VALUE USING TECHSTREAM (+BM VOLTAGE)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

  1. Read the value displayed on the Techstream.

    Standard voltage:
    11 to 14 V


NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS (Click here)  

2.CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY)
A112590E01

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

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

    2. Disconnect the A21 ECM connector.

    3. Check the resistance.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      ETCS fuse (2) - +BM (A21-3)
      		Below 1 Ω

      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      ETCS fuse (2) or +BM (A21-3) - Body ground
      		10 kΩ or higher

    4. Reinstall the ETCS fuse.

    5. Reconnect the ECM connector.

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

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

    2. Disconnect the cable from the negative battery terminal.

    3. Disconnect the cable from the positive battery terminal.

    4. Check the resistance.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      Positive battery cable - ETCS fuse (1)
      		Below 1 Ω

      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      Positive battery cable or ETCS fuse (1) - Body ground
      		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 TERMINAL VOLTAGE)
A106902E28

  1. Disconnect the A21 and C20 ECM connectors.

  1. Measure the voltage between the terminals of the A21 and C20 ECM connectors.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    +BM (A21-3) - E1 (C20-104)
    		11 to 14 V
    +BM (A21-3) - ME01 (C20-43)
    		11 to 14 V

  1. Reconnect the ECM connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (TERMINAL E1 AND ME01 - BODY GROUND)
OK

REPLACE ECM (Click here)