Fuel Injector Circuit [02/2014 - 11/2016]: Procedure

WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Fuel Injector Assembly)

Disconnect the fuel injector assembly connector.
Turn the power switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
C24-2 - Body ground	Power switch on (IG)	11 to 14 V
C26-2 - Body ground	Power switch on (IG)	11 to 14 V
C27-2 - Body ground	Power switch on (IG)	11 to 14 V
C29-2 - Body ground	Power switch on (IG)	11 to 14 V
C30-2 - Body ground	Power switch on (IG)	11 to 14 V
C31-2 - Body ground	Power switch on (IG)	11 to 14 V

Result

Proceed to
OK
NG

Result: 2

See step 4

Result: 1

See step 2

INSPECT FUEL INJECTOR ASSEMBLY

Inspect the fuel injector assembly.

Refer to INSPECTION [02/2014 - 11/2016]

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly.

Refer to INITIALIZATION [02/2014 - 11/2016]

Result

Proceed to
OK
NG

Result: 2

REPLACE FUEL INJECTOR ASSEMBLY. Refer to REMOVAL [02/2014 - 11/2016]

Result: 1

See step 3

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

Disconnect the fuel injector assembly connector.
Disconnect the ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
C24-1 - C1-19 (#10)	Always	Below 1 Ω
C26-1 - C1-20 (#20)	Always	Below 1 Ω
C27-1 - C1-53 (#30)	Always	Below 1 Ω
C29-1 - C1-49 (#40)	Always	Below 1 Ω
C30-1 - C1-21 (#50)	Always	Below 1 Ω
C31-1 - C1-52 (#60)	Always	Below 1 Ω
C24-1 or C1-19 (#10) - Body ground	Always	10 kΩ or higher
C26-1 or C1-20 (#20) - Body ground	Always	10 kΩ or higher
C27-1 or C1-53 (#30) - Body ground	Always	10 kΩ or higher
C29-1 or C1-49 (#40) - Body ground	Always	10 kΩ or higher
C30-1 or C1-21 (#50) - Body ground	Always	10 kΩ or higher
C31-1 or C1-52 (#60) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result: 1

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [02/2014 - 11/2016]

Result: 2

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - FUEL INJECTOR ASSEMBLY)

Disconnect the fuel injector assembly connector.
Disconnect the semiconductor pwr integration ECU connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
1G-3 - C24-2	Always	Below 1 Ω
1G-3 - C26-2	Always	Below 1 Ω
1G-3 - C27-2	Always	Below 1 Ω
1G-3 - C29-2	Always	Below 1 Ω
1G-3 - C30-2	Always	Below 1 Ω
1G-3 - C31-2	Always	Below 1 Ω
1G-3 or C24-2 - Body ground	Always	10 kΩ or higher
1G-3 or C26-2 - Body ground	Always	10 kΩ or higher
1G-3 or C27-2 - Body ground	Always	10 kΩ or higher
1G-3 or C29-2 - Body ground	Always	10 kΩ or higher
1G-3 or C30-2 - Body ground	Always	10 kΩ or higher
1G-3 or C31-2 - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result: 2

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result: 1

See step 5

INSPECT SEMICONDUCTOR PWR INTEGRATION ECU

Inspect the semiconductor pwr integration ECU (IG2 relay).

Refer to INSPECTION [02/2014 - ]

Result

Proceed to
OK
NG

Result: 1

GO TO ECM POWER SOURCE CIRCUIT. Refer to ECM Power Source Circuit [02/2014 - 11/2016]

Result: 2

REPLACE SEMICONDUCTOR PWR INTEGRATION ECU. Refer to REMOVAL [02/2014 - ]