Fuel Injector Circuit

3MZ-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 injector assembly connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

(c) Turn the power switch off.
(d) Reconnect the injector assembly connector.
NG -- INSPECT FUSE (INJ NO. 2 FUSE)
OK -- Continue to next step.
2. INSPECT INJECTOR ASSEMBLY
(a) Inspect the injector assembly Testing and Inspection.
NG -- REPLACE INJECTOR ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the injector connectors.
(b) Disconnect the hybrid vehicle control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Check for open

Check for short

(d) Reconnect the hybrid vehicle control ECU connector.
(e) Reconnect the injector connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

(a) Disconnect the hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(c) Reconnect the hybrid vehicle control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
5. INSPECT FUSE (INJ NO. 2 FUSE)

(a) Remove the INJ No. 2 fuse from engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(c) Reinstall the INJ No. 2 fuse.
NG -- REPLACE FUSE (INJ NO. 2 FUSE)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY)