Sfi System (For Sedan) Vc Output Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MIL

CHECK COMMUNICATION BETWEEN TESTER AND ECM

CHECK MIL (THROTTLE POSITION SENSOR)

CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

CHECK MIL (CANISTER PUMP MODULE)

CHECK HARNESS AND CONNECTOR (ECM - EACH SENSOR)

SFI SYSTEM (for Sedan) - 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 Sedan) 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 inactivated 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 for several seconds when the ignition switch is first 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 Sedan) Vc Output Circuit


INSPECTION PROCEDURE

1.CHECK MIL

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

    OK:
    MIL lights up


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000000PDG0JIX.html)

2.CHECK COMMUNICATION BETWEEN TESTER AND ECM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Check the communication between the Techstream and ECM.

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


A
GO TO MIL CIRCUIT (YARIS_NCP93 RM000000WZ10O2X.html)
B


3.CHECK MIL (THROTTLE POSITION SENSOR)

  1. Disconnect the C17 throttle with motor body assembly connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

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

  1. Reconnect the throttle with motor body assembly connector.



A
REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY (YARIS_NCP93 RM000001CZA012X.html)
B


4.CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

  1. Disconnect the A20 accelerator pedal assembly connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

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

  1. Reconnect the accelerator pedal assembly connector.



A
REPLACE ACCELERATOR PEDAL ASSEMBLY (YARIS_NCP93 RM000001CYE01DX.html)
B


5.CHECK MIL (CANISTER PUMP MODULE)


    Yaris. Ncp93, 131

  1. Disconnect the J25 canister pump module connector.

  1. Turn the ignition switch to ON.

  1. Check the MIL.

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

  1. Reconnect the canister pump module connector.



A
REPLACE CANISTER (YARIS_NCP93 RM000001E2T00BX.html)
B


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

  1. Disconnect the C17 throttle with motor body assembly connector.

  1. Disconnect the A20 accelerator pedal assembly connector.

  1. Disconnect the J25 canister pump module connector.



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

  1. Disconnect the A21 and C20 ECM connectors.

  1. Check the resistance.

    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    VCTA (C20-67) - Body ground
    		10 kΩ or higher
    VCPA (A21-57) - Body ground
    VCP2 (A21-58) - Body ground
    VCPP (C20-70) - Body ground

  1. Reconnect the throttle with motor body assembly connector.

  1. Reconnect the accelerator pedal assembly connector.

  1. Reconnect the canister pump module connector.

  1. Reconnect the ECM connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)