Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Fail-safe

  3. Wiring diagram

  4. Inspection procedure

  5. Read value using intelligent tester (+bm voltage)

  6. Check fuse (etcs fuse)

  7. Check harness and connector (ecm - etcs fuse, etcs fuse - battery)

  8. Inspect ecm (+bm voltage)

  9. Inspect battery

  10. Check battery terminal

DTC P2118 Throttle Actuator Control Motor Current Range / Performance


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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.

Open in ETCS power source circuit Yaris


DTC No.
DTC Detection Conditions
Trouble Areas
P2118
Open in ETCS 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 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° 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 off.

WIRING DIAGRAM


Connect an intelligent tester to the DLC3. Yaris


INSPECTION PROCEDURE

HINT:
Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. 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 INTELLIGENT TESTER (+BM VOLTAGE)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / +BM voltage.

  1. Read the value displayed on the tester.

    Standard voltage:
    9 to 14 V


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Go to step 5
NG
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2.CHECK FUSE (ETCS FUSE)
  1. Remove the ETCS fuse from the engine room relay block. Yaris

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

  1. Check the ETCS fuse resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the ETCS fuse.



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CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK
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3.CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY)
  1. Check the harness and connector between the ETCS fuse and ECM.Remove the ETCS fuse from the engine room relay block.Disconnect the A21 ECM connector.Check the resistance.Standard resistance (Check for open):Tester ConnectionsSpecified ConditionsETCS fuse (2) - +BM (A21-3)Below 1 ΩStandard resistance (Check for short):Tester ConnectionsSpecified ConditionsETCS fuse (2) or +BM (A21-3) - Body ground10 kΩ or higherReinstall the ETCS fuse.Reconnect the ECM connector. Yaris

  2. 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 positive battery cable.

    3. 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

    4. Reinstall the ETCS fuse.

    5. Reconnect the positive battery cable.



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REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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Go to step 5

4.INSPECT ECM (+BM VOLTAGE)
  1. Disconnect the A21 and C20 ECM connectors. Yaris

  2. 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)
    		9 to 14 V

  1. Reconnect the ECM connectors.



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REPAIR OR REPLACE HARNESS OR CONNECTOR (TERMINAL E1 - BODY GROUND)
OK
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REPLACE ECM (Click here)

5.INSPECT BATTERY

  1. Check that the battery is not depleted.

    OK:
    Battery is not depleted


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REPLACE BATTERY
OK
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6.CHECK BATTERY TERMINAL

  1. Check that the battery terminals and ECM ground are not loose or corroded.

    OK:
    Battery terminals and ECM ground are not loose or corroded


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REPAIR OR REPLACE BATTERY TERMINAL
OK
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CHECK FOR INTERMITTENT PROBLEMS (Click here)