12698484
HITACHI 12698484 Pompa Alta Pressione GM Buick Cadillac CT4 CT5 2.0T LSY 350 bar
12683985, 12694539, 12708365, HFS034-135Integrated Pulse-Width Modulated Electric Spill Valve (SCV)-350 barApplicazioni Veicolo e Motore
Specifiche Tecniche
| Specifica | Valore |
|---|---|
| Manufacturer | Hitachi Astemo / General Motors Genuine Parts |
| System Technology | 350 bar (35 MPa / 5076 psi) Ultra-High Pressure SIDI Mechanical Pump |
| Drive Cam Element | Camshaft Follower Roller Lifter (GM 12674744) on Exhaust Cam |
| Mounting Flange Fastener Torque | 12 N·m + 45° Torque-To-Yield (TTY) M6 Bolts |
| High Pressure Pipe Joint Torque | 32 N·m Flare Nut Connection |
| Valvola di comandoSpecifica Chiave | |
| Codici guasto tipici | P0087 (Fuel Rail Pressure Low), P0089 (Fuel Pressure Regulator Performance), P016F |
| Common Symptoms | High-pressure fuel odor in oil filler cap, rising crankcase oil level, check engine light & hesitations under load |
| Pressione di esercizioSpecifica Chiave |
Pompa alta pressione abbinata (Gruppo circuito carburante)
Funziona sullo stesso circuito ad alta pressione Common Rail. In caso di bassa pressione rail (P0087), verificare la portata della pompa prima di sostituire gli iniettori.
Istruzioni di montaggio
- [
- {
- "step": 1,
- "title": "Relieve 350 bar High-Pressure Fuel Rail",
- "instruction": "Disconnect fuel pump control module (FPCM) harness. Crank engine for 10 seconds. Check GDS2 scan tool to verify fuel rail pressure is below 1 MPa."
- },
- {
- "step": 2,
- "title": "Inspect Engine Oil for Gasoline Dilution",
- "instruction": "Check dipstick and oil filler cap. If oil smells strongly of gasoline or viscosity has degraded due to pump shaft seal leakage, replace engine oil and filter."
- },
- {
- "step": 3,
- "title": "Inspect Roller Lifter Tappet GM 12674744",
- "instruction": "Slide out roller lifter from cylinder head. Inspect roller bearing for pitting or flat spots. Coat lifter in clean engine oil prior to reinsertion."
- },
- {
- "step": 4,
- "title": "Torque Pump Flange Bolts to TTY Spec",
- "instruction": "Set camshaft drive lobe to low circle. Hand-start new TTY flange bolts. Tighten evenly in alternating stages to 12 N\u00b7m, then apply a final 45-degree angle turn."
- },
- {
- "step": 5,
- "title": "Connect High-Pressure Hard Line & Torque",
- "instruction": "Align high-pressure delivery pipe into pump outlet. Hand-tighten flare nut squarely, then torque flare fitting to exactly 32 N\u00b7m."
- }
- ]
Codici Guasto (DTC) e Protocolli Diagnostici
Codici guasto diagnostici (DTC) comuni generati quando questo iniettore common rail presenta usura, problemi ai circuiti o scostamenti:
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
Injector Circuit Malfunction / Open Circuit
Solenoid coil resistance drift (0.2-0.5 Ω) or piezo stack degradation triggers driver stage shutdown on affected cylinders.
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
Protocolli Tecnici di Diagnosi & Assistenza
Procedure d'officina verificate, valori soglia di test e linee guida operative per questo assieme.