JL3Z-9F593-A

1. [
2. {
3. "step": 1,
4. "title": "Dual-Fuel System Depressurization & Preparation",
5. "instruction": "Depressurize both port fuel and direct injection systems by disabling the low-pressure fuel pump fuse and running engine until stall. Disconnect battery negative terminal."
6. },
7. {
8. "step": 2,
9. "title": "Intake Manifold & Upper Port Injection Rail Removal",
10. "instruction": "Remove intake air ducting and throttle body connections. Disconnect low-pressure port injector wiring harness and unbolt upper intake manifold assembly to access the direct injection rail beneath."
11. },
12. {
13. "step": 3,
14. "title": "Direct Injection Rail & Steel Fuel Line Removal",
15. "instruction": "Disconnect high-pressure direct fuel injector electrical plugs. Using a flare wrench, loosen the high-pressure crossover tube fittings. Remove fuel rail hold-down bolts (10 N·m) and withdraw rail with injectors."
16. },
17. {
18. "step": 4,
19. "title": "Cylinder Head Bore Cleaning & PTFE Seal Pre-Fitting",
20. "instruction": "Clean injector combustion bores in the cylinder head using brass soft brushes and lint-free swabs. Ensure the pre-installed Teflon seal ring on the new Bosch injector is undamaged and free of engine oil/grease."
21. },
22. {
23. "step": 5,
24. "title": "Rail Alignment & Torque Specification Adherence",
25. "instruction": "Lightly lubricate upper FKM O-rings with clean engine oil (keep lower Teflon dry). Press injectors into cylinder head bores, position direct fuel rail, and torque mounting bolts in two passes up to 10 N·m."
26. },
27. {
28. "step": 6,
29. "title": "High-Pressure Line Torquing & Engine Leak Inspection",
30. "instruction": "Reinstall high-pressure fuel lines and torque flare nuts to 28 N·m. Reinstall intake manifold and port injection components. Cycle ignition 3 times to prime system and perform high-pressure fuel leak diagnostic check."
31. }
32. ]

Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift: