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Fuel Injector Circuit








1GR-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 FUEL INJECTOR ASSEMBLY (POWER SOURCE)




(a) Disconnect the fuel injector connectors.
(b) Turn the ignition switch ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





(d) Reconnect the fuel injector connectors.
NG -- CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - IGNITION SWITCH)
OK -- Continue to next step.
2. INSPECT FUEL INJECTOR ASSEMBLY (INJECTOR RESISTANCE)




(a) Disconnect the fuel injector connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





(c) Reconnect the fuel injector connectors.
NG -- REPLACE FUEL INJECTOR ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)




(a) Disconnect the B3 ECM connector.
(b) Disconnect the B9, B10, B11, B18, B21 and B25 fuel injector connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for short):






Standard Resistance (Check for open):





(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 B1 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)
(a) Check the fuel injector and volume Testing and Inspection.
NG -- REPLACE FUEL INJECTOR ASSEMBLY
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
6. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - IGNITION SWITCH)




(a) Disconnect the B9, B10, B11, B18, B21 and B25 fuel injector connectors.
(b) Disconnect the A1 ignition switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for short):






Standard Resistance (Check for open):





(d) Reconnect the fuel injector connectors.
(e) Reconnect the ignition switch connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT
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