Fuel Injectors, Checking

Function

The Cylinder Fuel Injectors -- are controlled by the Engine Control Module -J623- and 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

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: SAFETY PRECAUTIONS .
View clean working conditions: CLEAN WORKING CONDITIONS .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	-- YES: GO TO Step 2. -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Faulty Fuel Injector -- harness connector. CHECK: The faulty Fuel Injector -- component connector terminals 1 to 2 for resistance (refer to the appropriate wiring diagram for proper terminal locations). SPECIFIED VALUE: 8- 15 Ω (@ approx. 20° C). -- Was Value obtained?	-- YES: GO TO Step 3. -- NO: CHECK: Wiring for opens, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 4.
3	REMOVE: Engine Control Module - J623-. CHECK: Faulty Fuel Injector -- harness connector terminal 1 to the Engine Control Module - J623- harness connector for resistance. 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 for resistance. Refer to the wiring diagram for proper terminal locations. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Engine Control Module -J623-. GO TO: Step 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.
4	Final Procedure Perform a road test to verify repair. Do any DTC's return:	-- YES: Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY . Perform the diagnostic procedure for that DTC. -- NO: Repair is complete. Generate readiness code. Refer to READINESS CODE . Return vehicle to Customer.