Sfi System Vc Output Circuit

Engine Hybrid System. Corolla. Zre142 Aze141
2Az-Fe Engine Control. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MIL

CHECK COMMUNICATION BETWEEN TECHSTREAM AND ECM

CHECK MIL (THROTTLE POSITION SENSOR)

CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

CHECK MIL (CANISTER PUMP MODULE)

CHECK HARNESS AND CONNECTOR (VC CIRCUIT)

SFI SYSTEM - VC Output Circuit


DESCRIPTION

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

Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System 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 when the ignition switch is turned ON. The MIL goes off when the engine is started.

WIRING DIAGRAM


Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System Vc Output Circuit


INSPECTION PROCEDURE

1.CHECK MIL

  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 (COROLLA_ZRE142 RM000000PDG0P4X.html)

2.CHECK COMMUNICATION 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 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 (COROLLA_ZRE142 RM000000WZ10W6X.html)
B


3.CHECK MIL (THROTTLE POSITION SENSOR)

  1. Disconnect the throttle body 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 body connector.



A
REPLACE THROTTLE BODY (COROLLA_ZRE142 RM0000017UC03CX.html)
B


4.CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR)

  1. Disconnect the accelerator pedal position sensor 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 position sensor connector.



A
REPLACE ACCELERATOR PEDAL ASSEMBLY (COROLLA_ZRE142 RM000003D3500AX.html)
B


5.CHECK MIL (CANISTER PUMP MODULE)


    Corolla. Zre142 Aze141

  1. Disconnect the 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 (COROLLA_ZRE142 RM0000012OC01ZX.html)
B


6.CHECK HARNESS AND CONNECTOR (VC CIRCUIT)

  1. Disconnect the throttle body connector.

  1. Disconnect the accelerator pedal position sensor 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 (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    B31-67 (VCTA) - Body ground
    		Always
    		10 kΩ or higher
    A50-57 (VCPA) - Body ground
    		Always
    		10 kΩ or higher
    A50-58 (VCP2) - Body ground
    		Always
    		10 kΩ or higher
    B31-70 (VCPP) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the throttle body connector.

  1. Reconnect the accelerator pedal position sensor connector.

  1. Reconnect the canister pump module connector.

  1. Reconnect the ECM connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.html)