HITACHI
079127025AF
Visa spec.
SolenoidGasoline Direct Injection (GDI)Euro 56
HITACHI 079127025AF Högtryckspump Audi RS4 RS5 S6 S7 A8 4.0T 4.2L V8 FSI
OE-REFERENS
079127025C, 0261520262, HPP0017STYRVENTIL
-SPRIDARSPETS
-RAILTRYCK
120 barMILJÖKLASSEuro 5 / Euro 6
GARANTI12 Månader
03
Tekniska specifikationer
| Specifikation | Värde |
|---|---|
| Part Number / SKU | 079127025AF |
| Manufacturer Brand | HITACHI |
| Component Type | Mechanical High Pressure Fuel Pump (HPFP) |
| Engine Application | Audi 4.0L TFSI & 4.2L FSI DOHC 32V V8 (EA824 / CEUC / CTGE / BNS) |
| ArbetstryckHuvudspec. | |
| Mounting Torque (Flange / Bracket) | 20 N-m (15 lb-ft) |
| Fuel Line / Rail Torque | 25 N-m (18 lb-ft) |
| Vanliga felkoder | P0087, P0088, P0171, P2293 |
04
Monteringsanvisningar
- Depressurize Fuel System: Pull fuel pump fuse or disconnect LPFP harness. Crank engine 5-8 seconds until it stalls to drop residual rail pressure below 5 bar.
- Clean Surrounding Cavity: Blow compressed air around cylinder head bore or pump flange cavity to prevent dirt ingress into the fuel rail.
- Lubricate & Fit Seals: Inspect Teflon combustion seals or O-rings. Coat lightly with clean motor oil (do not use grease) to avoid tearing during insertion.
- Torque to Factory Specification: Hand-thread bolts evenly. Tighten mounting fasteners to 20 N-m (15 lb-ft), and torque fuel line fittings to 25 N-m (18 lb-ft).
- Prime & Leak Check: Cycle ignition to RUN position 3 times (5 seconds each) to build low-side pressure. Inspect fittings for leaks before starting engine.
05
Felkoder (DTC) och Diagnosprotokoll
Vanliga diagnosfelkoder (DTC) som aktiveras nar denna common rail-injektor uppvisar slitage, kretsfel eller kalibreringsavvikelse:
P0087Critical
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
P0201 - P0208High
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.
P0300 / P0301+High
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
P0088High
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
VERKSTADSMANUALER
Tekniska Diagnos- och Serviceprotokoll
Verifierade verkstadsrutiner, testgränsvärden och serviceinstruktioner för denna komponent.
VERKSTADSDIAGNOSTIK COMMON RAIL
Läs tekniskt protokollHögtryckspump Diagnostik: Felkod P0087 & Bosch CP4 Test
COMMON RAIL VERKSTADSDIAGNOSTIK
Läs tekniskt protokollBränsledoseringsventil IMV SCV Diagnos: P0088 Test
OBD-II DIAGNOSPROTOKOLL
Läs tekniskt protokollP0087 Lågt railtryck - Diagnos- och felsökningsguide
VERKSTADSDIAGNOSTIK COMMON RAIL
Läs tekniskt protokoll