Fuel Injector Circuit

1AR-FE ENGINE CONTROL: 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

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

(a) Disconnect the fuel injector assembly connectors.





(b) Turn the ignition switch to ON.

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

Standard Voltage:





Text in Illustration





(d) Reconnect the fuel injector assembly connectors.

NG -- CHECK HARNESS AND CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY)
OK -- Continue to next step.

2. INSPECT FUEL INJECTOR ASSEMBLY (INJECTOR RESISTANCE)

(a) Inspect the fuel injector assembly Testing and Inspection.

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

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

(a) Disconnect the ECM connector.

(b) Disconnect the fuel injector assembly connectors.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(d) Reconnect the fuel injector assembly connectors.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

4. CHECK HARNESS AND CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY)

(a) Disconnect the fuel injector assembly connectors.

(b) Remove the IG2 relay from the engine room relay block.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(d) Reconnect the fuel injector assembly connectors.

(e) Reinstall the IG2 relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- CHECK ECM POWER SOURCE CIRCUIT Component Tests and General Diagnostics