Fuel Injector Circuit

2UZ-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. CHECK INJECTOR ASSEMBLY (POWER SOURCE)





(a) Disconnect the fuel 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 FUSE (INJ)
OK -- Continue to next step.
2. INSPECT FUEL INJECTOR ASSEMBLY
(a) Inspect the fuel injector (On-Vehicle Inspection).
NG -- REPLACE FUEL INJECTOR ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)





(a) Disconnect the fuel 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 -- Continue to next step.
4. REPLACE ECM
(a) Replace the ECM (Removal).
NEXT -- Continue to next step.
5. CHECK PROBLEM SYMPTOM DISAPPEARS
(a) Check if the problem symptom disappears.

Result





B -- GO TO PROBLEM SYMPTOMS TABLE
A -- END
6. INSPECT FUSE (INJ)





(a) Remove the INJ 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.
7. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - INTEGRATION RELAY)





(a) Disconnect the fuel injector connector.
(b) Remove the integration relay from the engine room relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- CHECK ECU POWER SOURCE CIRCUIT