Fuel Injectors --, CHECKING

Function

The Fuel Injectors -- are controlled by the Engine Control Module -J623- and are mounted normally in the cylinder head. The fuel injectors spray high-pressure atomized fuel directly into the combustion chamber.

Special tools and workshop equipment required

Multimeter
Wiring Diagram
Scan Tool
LED Test Lamp

Test requirements

Fuses OK.
Battery voltage OK.
Switch OFF all electrical and electronic accessories.
Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
Coolant Temperature: ≥ 80° C.
Observe all safety precautions: .
View clean working conditions: .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to . -- Was Complaint verified?	-- YES: GO TO Step 2 Fuel Injectors --, CHECKING => 2 . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Faulty Fuel Injector -- from harness connector. CHECK: The faulty Fuel Injector -- component connector terminals 1 to 2 for resistance (refer to the wiring diagram for proper terminal locations). SPECIFIED VALUE: 0.5 - 15 Ω (@ approx. 20° C). -- Was Value obtained?	-- YES: GO TO Step 3 Fuel Injectors --, CHECKING => 3 . -- NO: REPLACE: Faulty Fuel Injector -- (s). Refer to appropriate repair information. GO TO: Step 4 Fuel Injectors --, CHECKING => 4 .
3	REMOVE: Engine Control Module - J623-. Refer to appropriate repair information. CHECK: Faulty Fuel Injector -- harness connector terminal 1 to the Engine Control Module - J623- harness connector T105 / xx (refer to the wiring diagram for proper terminal locations). CHECK: Faulty Fuel Injector -- harness connector terminal 2 to the Engine Control Module - J623- harness connector T105 / xx (refer to the wiring diagram for proper terminal locations). SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Faulty Fuel Injector -- for a mechanical condition. Refer to appropriate repair information. GO TO: Step 4 Fuel Injectors --, CHECKING => 4 . -- NO: CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 4 Fuel Injectors --, CHECKING => 4 .
4	Final Procedure Perform a road test to verify repair. Do any DTC's return:	-- YES: FAULT DOES RETURN: REPLACE: Engine Control Module - J623-. Refer to appropriate repair information. FAULT DOES NOT RETURN: Check the DTC memory. Refer to . Perform the diagnostic procedure for that DTC. -- NO: Repair is complete. Generate readiness code. Refer to . Return vehicle to Customer.