Fuel Injector Circuit

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Injector Circuit
- Fuel Injector Circuit

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





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT INJECTOR ASSEMBLY (POWER SOURCE)





(a) Disconnect the injector connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:





NG -- INSPECT FUSES (INJ, IG2 MAIN)
OK -- Continue to next step.

2. INSPECT INJECTOR ASSEMBLY

(a) Inspect the injector Testing and Inspection.

NG -- REPLACE INJECTOR ASSEMBLY Removal
OK -- Continue to next step.

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





(a) Disconnect the injector connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal

4. INSPECT FUSES (INJ, IG2 MAIN)





(a) Remove the INJ fuse and IG2 MAIN fuse from the engine room relay block.

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

Standard Resistance:





NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

5. INSPECT INTEGRATION RELAY (IG2)

(a) Inspect the integration relay .

NG -- REPLACE INTEGRATION RELAY

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - INJECTOR ASSEMBLY)