Fuel Injector Circuit 2ZR-FXE

Fuel Injector Circuit

Description

Wiring diagram

Inspection procedure

Check fuel injector assembly (power source voltage)

Inspect fuel injector assembly

Check harness and connector (fuel injector assembly - ecm)

Check harness and connector (no. 2 integration relay (ig2 relay) - fuel injector assembly)

Description

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

Wiring diagram

Lexus Fuel Injector Circuit. Wiring diagram.

Inspection procedure

1.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)

Lexus Fuel Injector Circuit. Disconnect the fuel injector assembly connectors.

  1. Disconnect the fuel injector assembly connectors.

  1. Turn the power switch on (IG).

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

    Standard Voltage:

    Tester Connection Switch Condition Specified Condition
    D14-1 - Body ground Power switch on (IG) 11 to 14 V
    D15-1 - Body ground Power switch on (IG) 11 to 14 V
    D16-1 - Body ground Power switch on (IG) 11 to 14 V
    D17-1 - Body ground Power switch on (IG) 11 to 14 V
    Text in Illustration
    *a Front view of wire harness connector (to Fuel Injector Assembly)
  NG  
Go to step 4
 
OK  
   

2.INSPECT FUEL INJECTOR ASSEMBLY
  1. Inspect the fuel injector assembly .

  NG  
REPLACE FUEL INJECTOR ASSEMBLY
 
OK  
   

3.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
  1. Disconnect the fuel injector assembly connectors.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection Condition Specified Condition
    D14-2 - D27-85 (#10) Always Below 1 ?
    D15-2 - D27-84 (#20) Always Below 1 ?
    D16-2 - D27-83 (#30) Always Below 1 ?
    D17-2 - D27-82 (#40) Always Below 1 ?
    D14-2 or D27-85 (#10) - Body ground Always 10 ? or higher
    D15-2 or D27-84 (#20) - Body ground Always 10 ? or higher
    D16-2 or D27-83 (#30) - Body ground Always 10 ? or higher
    D17-2 or D27-82 (#40) - Body ground Always 10 ? or higher
  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
   
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

4.CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - FUEL INJECTOR ASSEMBLY)
  1. Disconnect the fuel injector assembly connectors.

  1. Remove the No. 2 integration relay from the engine room relay block.

  1. Disconnect the No. 2 integration relay connector.

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

    Standard Resistance:

    Tester Connection Condition Specified Condition
    D14-1 - 1A-4 Always Below 1 ?
    D15-1 - 1A-4 Always Below 1 ?
    D16-1 - 1A-4 Always Below 1 ?
    D17-1 - 1A-4 Always Below 1 ?
    D14-1 or 1A-4 - Body ground Always 10 k? or higher
    D15-1 or 1A-4 - Body ground Always 10 k? or higher
    D16-1 or 1A-4 - Body ground Always 10 k? or higher
    D17-1 or 1A-4 - Body ground Always 10 k? or higher
  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
   
CHECK ECM POWER SOURCE CIRCUIT