Sfi System (For Hatchback) Vc Output Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MIL CONDITION

CHECK CONNECTION BETWEEN TECHSTREAM AND ECM

CHECK MIL (THROTTLE POSITION SENSOR)

CHECK MIL (ACCELERATOR PEDAL SENSOR ASSEMBLY)

CHECK MIL (CANISTER PUMP MODULE)

CHECK HARNESS AND CONNECTOR (EACH SENSOR - ECM)

SFI SYSTEM (for Hatchback) - VC Output Circuit


DESCRIPTION

The ECM constantly generates 5 V power from the battery voltages supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.

Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Hatchback) Vc Output Circuit

When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied with power through the VC circuit are deactivated because the power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.
HINT:
Under normal conditions, the MIL is illuminated when the ignition switch is turned to ON. The MIL goes off when the engine is started.

WIRING DIAGRAM


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan).Sfi System (For Hatchback) Vc Output Circuit


INSPECTION PROCEDURE

1.CHECK MIL CONDITION

  1. Check that the Malfunction Indicator Lamp (MIL) lights up when turning the ignition switch to ON.

    OK:
    MIL lights up.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000000PDG0L6X.html)

2.CHECK CONNECTION BETWEEN TECHSTREAM AND ECM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Check for communication between the Techstream and ECM.

    Result
    Result
    		Proceed to
    Communication is not possible
    		A
    Communication is possible
    		B


B
GO TO MIL CIRCUIT (YARIS_NCP93 RM000000WZ10QCX.html)
A


3.CHECK MIL (THROTTLE POSITION SENSOR)

  1. Disconnect the throttle with motor body assembly connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

    Result
    Result
    		Proceed to
    MIL does not illuminate
    		A
    MIL illuminates
    		B
    HINT:
    Perform "Inspection After Repair" after replacing the throttle with motor body assembly (YARIS_NCP93 RM000004NJD006X.html).


B
REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY (YARIS_NCP93 RM000003VHR00IX.html)
A


4.CHECK MIL (ACCELERATOR PEDAL SENSOR ASSEMBLY)

  1. Disconnect the accelerator pedal sensor assembly connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

    Result
    Result
    		Proceed to
    MIL does not illuminate
    		A
    MIL illuminates
    		B


B
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY (YARIS_NCP93 RM000003VHW00JX.html)
A


5.CHECK MIL (CANISTER PUMP MODULE)

  1. Disconnect the canister pump module connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

    Result
    Result
    		Proceed to
    MIL does not illuminate
    		A
    MIL illuminates
    		B


B
REPLACE CANISTER (YARIS_NCP93 RM000001WTG036X.html)
A


6.CHECK HARNESS AND CONNECTOR (EACH SENSOR - ECM)

  1. Disconnect the throttle with motor body assembly connector.

  1. Disconnect the accelerator pedal sensor assembly connector.

  1. Disconnect the canister pump module connector.

  1. Disconnect the ECM connectors.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C51-115 (VCTA) - Body ground
    		Always
    		10 kΩ or higher
    A72-53 (VCPA) - Body ground
    		Always
    		10 kΩ or higher
    A72-56 (VCP2) - Body ground
    		Always
    		10 kΩ or higher
    A72-34 (VCPP) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002IX.html)