12698484
HITACHI 12698484 Yüksek Basınç Pompası GM Buick Cadillac 2.0T LSY 350 bar
12683985, 12694539, 12708365, HFS034-135Integrated Pulse-Width Modulated Electric Spill Valve (SCV)-350 barUyumlu Araçlar ve Motorlar
Teknik Özellikler
| Özellik | Değer |
|---|---|
| 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 |
| Kontrol ValfiTemel Değer | |
| Tipik Arıza Kodları | 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 |
| Çalışma BasıncıTemel Değer |
Uyumlu Yüksek Basınç Pompası (Yakıt Devresi Grubu)
Aynı yüksek basınçlı Common Rail devresinde çalışır. Düşük basınç (P0087) teşhisinde enjektörleri değiştirmeden önce pompa debisini kontrol edin.
Montaj İpuçları
- [
- {
- "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."
- }
- ]
Ariza Kodlari (DTC) ve Teshis Protokolleri
Bu common rail enjektorunde asinma, devre arizasi veya kalibrasyon kaymasi olustugunda tetiklenen yaygin ariza kodlari (DTC):
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.
Teknik Arıza Teşhis ve Servis Protokolleri
Bu parça grubu için doğrulanmış atölye prosedürleri, test eşik değerleri ve servis talimatları.