Dtc P2118 Throttle Actuator Control Motor Current Range / Performance

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

FAIL-SAFE

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (+BM VOLTAGE)

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

INSPECT ECM (+BM TERMINAL VOLTAGE)

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.

Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P2118 Throttle Actuator Control Motor Current Range / Performance


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

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 stores the DTC.
If the malfunction is not repaired successfully, the DTC is stored 5 seconds after the engine is next started.

MONITOR STRATEGY


Related DTCs
P2118: Throttle actuator power supply
Required Sensors/Components (Main)
Throttle actuator, throttle valve, ETCS fuse
Required Sensors/Components (Related)
None
Frequency of Operation
Continuous
Duration
0.8 seconds
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


Monitor runs whenever following DTCs not present
None
Battery voltage
8 V or more
Electronic throttle actuator power
ON

TYPICAL MALFUNCTION THRESHOLDS


Throttle actuator power supply voltage (+BM)
Less than 4 V

COMPONENT OPERATING RANGE


Throttle actuator power supply voltage (+BM)
11 to 14 V

CONFIRMATION DRIVING PATTERN


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P2118 Throttle Actuator Control Motor Current Range / Performance

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on [A].
  6. Start the engine.
  7. Slowly depress the accelerator pedal, raise the engine speed to approximately 3000 rpm over approximately 5 seconds, and then idle the engine [B].
  8. Check that 16 seconds or more have elapsed since the engine was started.
  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
  10. Read pending DTCs.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: P2118.
  13. Check the DTC judgment result.

    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [C] again.
  14. If no pending DTC is output, perform a universal trip and check for permanent DTCs (YARIS_NCP93 RM000000PDK0QGX.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

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


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P2118 Throttle Actuator Control Motor Current Range / Performance


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 (YARIS_NCP93 RM000000UYX0BYX.html).
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 (YARIS_NCP93 RM000000PDQ0NOX.html)

2.CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P2118 Throttle Actuator Control Motor Current Range / Performance

  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)
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P2118 Throttle Actuator Control Motor Current Range / Performance

  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 (YARIS_NCP93 RM000001CN002AX.html)