Sfi System (For Hatchback) Fuel Injector Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE)

INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY)

SFI SYSTEM (for Hatchback) - Fuel Injector Circuit


DESCRIPTION

The fuel injectors are located on the intake port. They inject fuel into the cylinders based on the signals from the ECM.

WIRING DIAGRAM


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


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE)


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

  1. Disconnect the fuel injector assembly connectors.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C43-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    C44-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    C45-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    C46-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Fuel Injector)


NG
Go to step 4
OK


2.INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)

  1. Check the fuel injector injection and volume (YARIS_NCP93 RM000001EDQ04MX.html).

    HINT:
    Perform "Inspection After Repair" after replacing the fuel injector assembly (YARIS_NCP93 RM000004NJD006X.html).


NG
REPLACE FUEL INJECTOR ASSEMBLY (YARIS_NCP93 RM000001EDS04WX.html)
OK


3.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

  1. Disconnect the ECM connector.

  1. Disconnect the fuel injector assembly connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C43-2 - C51-20 (#10)
    		Always
    		Below 1 Ω
    C44-2 - C51-17 (#20)
    		Always
    		Below 1 Ω
    C45-2 - C51-18 (#30)
    		Always
    		Below 1 Ω
    C46-2 - C51-19 (#40)
    		Always
    		Below 1 Ω
    C43-2 or C51-20 (#10) - Body ground
    		Always
    		10 kΩ or higher
    C44-2 or C51-17 (#20) - Body ground
    		Always
    		10 kΩ or higher
    C45-2 or C51-18 (#30) - Body ground
    		Always
    		10 kΩ or higher
    C46-2 or C51-19 (#40) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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

4.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY)

  1. Disconnect the fuel injector assembly connector.

  1. Remove the No. 1 integration relay.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C43-1 - 1E-2
    		Always
    		Below 1 Ω
    C44-1 - 1E-2
    		Always
    		Below 1 Ω
    C45-1 - 1E-2
    		Always
    		Below 1 Ω
    C46-1 - 1E-2
    		Always
    		Below 1 Ω
    C43-1 or 1E-2 - Body ground
    		Always
    		10 kΩ or higher
    C44-1 or 1E-2 - Body ground
    		Always
    		10 kΩ or higher
    C45-1 or 1E-2 - Body ground
    		Always
    		10 kΩ or higher
    C46-1 or 1E-2 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ECM POWER SOURCE CIRCUIT (YARIS_NCP93 RM000001F7102NX.html)