Fuel Injector Circuit

1AR-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

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

PROCEDURE

1. CHECK TERMINAL VOLTAGE (FUEL INJECTOR POWER SOURCE)

(a) Disconnect the fuel injector connectors.





(b) Turn the ignition switch to ON.

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

Standard Voltage:





(d) Reconnect the fuel injector connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - FUEL INJECTOR)
OK -- Continue to next step.

2. INSPECT FUEL INJECTOR (INJECTOR RESISTANCE)

(a) Inspect the fuel injector 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 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 connectors.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

(a) Disconnect the ECM connectors.

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

Standard Resistance (Check for Open):





(c) Reconnect the ECM connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. INSPECT FUEL INJECTOR (INJECTION AND VOLUME)

(a) Check the fuel injector injection and volume Testing and Inspection.

NG -- REPLACE FUEL INJECTOR Removal

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