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Fuel Injectors, Checking
General Description
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 automatic transmission, ensure the selector lever position is in "P".
- Vehicles with manual transmission, ensure the shifter lever position is in "N" with the parking brake applied.
- 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:
-- NO:
- GATHER more information from customer about the complaint.
|
| 2 |
- IGNITION: OFF.
- DISCONNECT: Suspect Fuel Injector -- harness connector.
- CHECK: Suspect Fuel Injector -- component connector terminals 1 to 2 for resistance (refer to appropriate wiring diagram for correct terminal and connector locations).
- SPECIFIED VALUE: 0.5 - 15 Ω (@ approx. 20° C).
-- Was Value obtained? |
-- YES:
-- NO:
|
| 3 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
- CHECK: Suspect Fuel Injector -- harness connector terminal 1 to the Engine Control Module - J623- harness connector T60 / xx for resistance (refer to appropriate wiring diagram for correct terminal and connector locations).
- CHECK: Suspect Fuel Injector -- harness connector terminal 2 to the Engine Control Module - J623- harness connector T60 / xx for resistance (refer to appropriate wiring diagram for correct terminal and connector locations).
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- Were Values obtained? |
-- YES:
- TIP: The Fuel Injector -- may fail under loaded operation; please swap a known good Fuel Injector -- prior to continuing to the next step.
- GO TO: Step 4 FUEL INJECTORS, CHECKING => 4 .
-- NO:
- PERFORM: Visual Inspection of wiring and component.
- 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.
-- Does the original DTC return? |
-- YES:
- CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins.
- REPAIR: As necessary.
- If all electrical connections are OK:
- REPLACE: Engine Control Module -J623-. Refer to appropriate repair information.
- Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
.
- Repair is complete. Generate Readiness Code. Refer to READINESS CODE
.
- Return vehicle to Customer.
-- NO:
- Perform the diagnostic procedure for any DTC's.
- If no DTC's return, the repair is complete.
- Return vehicle to customer.
|