Toyota Tundra Service Manual: 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

PROCEDURE

1.	INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE)

(a) Disconnect the fuel injector assembly connector.

(b) Turn the ignition switch to ON.

Standard Voltage:

Cylinder	Tester Connection	Switch Condition	Specified Condition
No. 1	H1-2 - Ground	Ignition switch ON	11 to 14 V
No. 2	F1-2 - Ground	Ignition switch ON	11 to 14 V
No. 3	H2-2 - Ground	Ignition switch ON	11 to 14 V
No. 4	F2-2 - Ground	Ignition switch ON	11 to 14 V
No. 5	H3-2 - Ground	Ignition switch ON	11 to 14 V
No. 6	F3-2 - Ground	Ignition switch ON	11 to 14 V
No. 7	H4-2 - Ground	Ignition switch ON	11 to 14 V
No. 8	F4-2 - Ground	Ignition switch ON	11 to 14 V

GO TO STEP 4

2.	INSPECT FUEL INJECTOR ASSEMBLY

(a) Inspect the fuel injector assembly (See page ).

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (See page ).

REPLACE FUEL INJECTOR ASSEMBLY

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

(a) Disconnect the fuel injector assembly connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Cylinder	Tester Connection	Condition	Specified Condition
No. 1	H1-1 - Ground	Always	10 kΩ or higher
No. 1	H1-1 - D74-86 (#10)	Always	Below 1 Ω
No. 2	F1-1 - Ground	Always	10 kΩ or higher
No. 2	F1-1 - D74-109 (#20)	Always	Below 1 Ω
No. 3	H2-1 - Ground	Always	10 kΩ or higher
No. 3	H2-1 - D74-85 (#30)	Always	Below 1 Ω
No. 4	F2-1 - Ground	Always	10 kΩ or higher
No. 4	F2-1 - D74-108 (#40)	Always	Below 1 Ω
No. 5	H3-1 - Ground	Always	10 kΩ or higher
No. 5	H3-1 - D74-84 (#50)	Always	Below 1 Ω
No. 6	F3-1 - Ground	Always	10 kΩ or higher
No. 6	F3-1 - D74-107 (#60)	Always	Below 1 Ω
No. 7	H4-1 - Ground	Always	10 kΩ or higher
No. 7	H4-1 - D74-83 (#70)	Always	Below 1 Ω
No. 8	F4-1 - Ground	Always	10 kΩ or higher
No. 8	F4-1 - D74-106 (#80)	Always	Below 1 Ω

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT FUSES (INJ, IG2 MAIN)

(a) Remove the INJ fuse and IG2 MAIN fuse from the engine room relay block.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
INJ fuse	Always	Below 1 Ω
IG2 MAIN fuse	Always	Below 1 Ω

CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

5.	INSPECT INTEGRATION RELAY (IG2)

(a) Inspect the integration relay (See page ).

REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY)

REPLACE INTEGRATION RELAY

Toyota Tundra Service Manual > Power Window Control System(w/ Jam Protection Function): Driver Side Power Window does not Operate with Power Window Master Switch
DESCRIPTION If the manual UP/DOWN function does not operate, there may be a malfunction in the master switch, the driver side motor, or the harness or connector. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following inspe ...

Toyota Tundra Owners Manual