P0002: Styrkrets bränslemängdreglering (VCV / IMV) - Område/prestanda
Felkod P0002 indikerar att motorstyrenheten (ECM/PCM) har detekterat en prestanda-, korrelations- eller rimlighetsavvikelse i den elektriska drivkretsen för bränslemängdreglerventilen (VCV), även benämnd sugreglerventil eller ingångsmätventil (IMV/SCV). I moderna common rail-dieselsystem (såsom Bosch CP1H, CP3, CP4, Delphi DFP3 och Denso HP3/HP4) är mängdreglerventilen monterad direkt på högtryckspumpen för att dosera volymen lågtrycksbränsle som släpps in i pumpelementens kompressionskammare. P0002 sätts när ECM:s interna shuntmotstånd för strömövervakning registrerar att den faktiska styrströmmen avviker från kalibrerade börvärden, eller när responsen i bränslerailtrycket avviker från den förväntade volymetriska reglerkurvan i sluten reglerslinga.
🚗 Körsäkerhet, typiska reparationskostnader & kontroll
- 01
🚦 Körsäkerhet och mekanisk risk
Omedelbar mekanisk bedömning och behov av bärgareStyrkrets för bränslemängdventil - räckvidd/prestanda (fel på VCV / IMV)
Bränslemängdventilen (VCV / IMV) på högtryckspumpen misslyckas med att modulera bränsleinloppsflödet. ECU kan inte reglera common rail-trycket, vilket medför risk för kraftigt övertryck eller plötsligt motorstopp.
MEKANISKA RISKER FÖR MOTORN VID FORTSATT KÖRNING:Oreglerade tryckspikar kan spräcka högtrycksrör av stål, öppna tryckbegränsningsventilen eller skada spridarnas interna ventiler. - 02
💰 Typisk verkstadsbudget
Förväntade kostnadsnivåer för reservdelar och arbeteLitet underhåll / Filter400 kr - 950 kr: Rengöring av kablage och kontaktdon, kontroll av skavda kablar till ventilenRengöring av givare, bränslefilterbyte, säkringskontroll eller kontaktstiftsrengöring.
Byte av ventil / Sensor1 300 kr - 3 800 kr: Byte till original Bosch/Delphi bränslemängdventil IMV/VCVByte av enskild komponent (tryckreglerventil, doseringsventil eller renoverad spridare).
Större översyn / Pump och spridare9 500 kr - 24 000 kr: Komplett byte av högtryckspump CP4/CP3Översyn av högtryckspump, ny OEM-spridaruppsättning eller byte av DPF-enhet.
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🧰 Snabb visuell kontroll utan verktyg
5-minuters garagekoll innan du ringer verkstaden11. Kontrollera det 2-poliga kontaktdonet till VCV/IMV på högtryckspumpen för korrosion, trasiga låsflikar och bränslefukt.22. Mät mängdventilens interna spolresistans med multimeter (vanligen 2,0 till 4,5 Ohm vid 20 deg C).33. Kapa upp bränslefiltret eller kontrollera mängdventilens filtersil efter fina metallspån (tecken på havererad CP4-pump). - 04
🛡️ Skydd mot feldiagnoser på verkstad
Konkreta frågor till mekanikern för att undvika onödiga komponentbyten""Kontrollera mängdventilens nätsil efter mässings- eller stålspån innan ventilen byts; hittas metall måste hela bränslesystemet spolas rent.""
""Verifiera att PWM-styrsignalen från ECU stämmer med arbetscykeln på ett oscilloskop innan pumpen antas vara mekaniskt defekt.""
""Säkerställ att bränslesystemet är korrekt luftat med den elektriska förpumpen före startförsök för att förhindra torrkörning av den nya ventilen.""
Teknisk anmärkning: Ställ dessa tekniska frågor till mekanikern innan du godkänner dyra offerter:
30-sekunders verkstadstriage
- Check Engine Light (MIL) illuminated continuously on the dashboard
- Engine hard starting, extended cranking times, or intermittent no-start conditions
- Engine surging, hunting, or unstable rpm fluctuations at idle and during light throttle cruise
- Mechanical sticking, varnish buildup, or metal debris jamming the precision spool inside the Fuel Volume Control Valve (VCV/IMV)
- Internal electrical coil breakdown, thermal resistance drift, or intermittent open winding inside the VCV solenoid
- High electrical contact resistance, terminal pin fretting corrosion, or loose female pins in the VCV two-pin connector
Connect scan tool live telemetry: compare Target Fuel Rail Pressure vs Actual Rail Pressure and log metering valve command PWM duty cycle during idle and road load.
Expensive Diagnostic Pitfall & Technical Reality
P0002 indicates that the high-pressure fuel pump has failed internally and must be replaced as an entire assembly ($1,400 - $2,200).
P0002 is a performance rationality code on the Fuel Volume Control Valve (VCV) or Inlet Metering Valve (IMV) circuit. The electrical circuit is intact (not open or shorted), but the commanded PWM duty cycle does not produce the expected rail pressure response. In over 80% of verified cases, the high-pressure pump is mechanically sound. The failure is driven by micro-varnish gumming on the metering valve plunger, fuel filter restriction causing cavitation, or fuel aeration from damaged low-pressure O-rings.
Unnecessary complete CP3/CP4 pump replacement ($1,650-$2,400 incl. labor) vs replacing the sub-component Bosch MPROP/IMV metering valve ($95-$145, 30-minute repair), saving over $1,500.
Mest påverkade motorer och insprutningssystem
Denna felkod påverkar främst följande diesel common rail-plattformar. Kontrollera din motorfamilj nedan för kända felmönster och artikelnummer:
Ford 6.7L Powerstroke V8 Diesel
Bosch CP4.2 High-Pressure Common Rail SystemKänt fabriksfel: EGR cooler carbon clogging, DEF injector white crust crystallization, fuel volume control valve harness chafing.
BC3Z-9A543-A, FC3Z-9F593-B, BC3Z-5J281-ARenault / Opel 1.9 dCi (F9Q)
Bosch EDC15 / EDC16 Common Rail SystemKänt fabriksfel: Injector harness connector diesel seepage, glow plug tip carbon seizure, EGR valve soot accumulation.
7700107165, 0445110021, 8200542997Volkswagen / Audi 2.0 TDI (EA189 / CFFB / CFGB)
Bosch EDC17 Common Rail SystemKänt fabriksfel: Piezo stack degradation, injector harness terminal fretting, DPF differential pressure sensor silicone tube split.
03L130277, 0445110369, 076906051AToyota 3.0 D-4D (1KD-FTV / Hilux / Prado)
Denso Common Rail SystemKänt fabriksfel: Suction control valve (SCV) stickiness, injector seat washer blow-by, fuel delivery balance deviation.
23670-30050, 095000-5471, 04226-0L010Fuel Metering Valve (IMV/SCV) Diagnostics Guide
Diagnostic guide for common rail fuel metering valves (IMV/SCV/FCA/MPROP). Normally open vs closed, coil resistance, PWM duty cycle & P0088 / P0089 test.
Styrkrets & Ställdonslogik
1. Dynamic In-Demand Fuel Metering
The Fuel Volume Control Valve (VCV/IMV) meters fuel on the suction side of the high-pressure pump. By only compressing the exact amount of fuel required by the engine, the system minimizes pump mechanical drive losses and prevents excessive fuel heating in the return circuit. The VCV is actuated via a Pulse-Width Modulated (PWM) current-controlled solenoid operated at frequencies between 100 Hz and 1,000 Hz. Depending on pump design, valves are either Normally Open (NO, e.g., Bosch CP3/CP4, where 0% duty cycle delivers maximum fuel) or Normally Closed (NC, e.g., some Denso and Delphi systems, where 0% duty cycle delivers zero fuel).
2. Closed-Loop PID Deviation Monitoring
The ECM's internal micro-controller commands target current (typically 0.0 A to 1.8 A) rather than simple voltage duty cycle. A high-speed current sensing amplifier measures actual current flowing through the coil on every PWM pulse. If the ECM commands 1.20 A but measures < 0.70 A or > 1.60 A, or if the drive current oscillates erratically due to internal plunger mechanical stick-slip friction, the ECM detects that the volume regulator cannot maintain rail stability, flagging DTC P0002 and triggering Limp-Home mode.
3. Diagnostic Trap: Normally Open (NO) vs Normally Closed (NC) Valves
Normally Open (NO) vs Normally Closed (NC) Emergency Behavior: On Bosch CP3 and CP4 systems, the VCV is Normally Open. If electrical power is lost, the internal spring forces the valve wide open, allowing the pump to build maximum rail pressure (relieved by the rail pressure control valve or mechanical pressure limiter). On Normally Closed systems, losing electrical control starves the pump of fuel, causing immediate engine stalling. Confirming valve architecture is vital for workshop diagnosis.
Elektriska & Hydrauliska referensvärden
Steg-för-steg Felsökningsprotokoll
Remove VCV / IMV and Inspect for Metal Shavings (Glitter Test)
Before performing electrical tests, disconnect the VCV connector and remove the two Torx hold-down bolts securing the valve to the high-pressure pump body. Carefully extract the valve and inspect the micro-mesh inlet screen and O-rings using a bright inspection light and a strong neodymium magnet. If metallic flakes, bronze dust, or silvery particles are found, the high-pressure pump has suffered internal mechanical failure; the entire fuel system (pump, rail, injectors, tank, lines) must be replaced.
Measure VCV Solenoid Coil Resistance at 20°C & Thermal Soak
Using a precision digital multimeter on the 200 Ω scale with zeroed test leads, measure resistance across the two VCV terminal pins at 20°C. Bosch CP3/CP4: 2.5-3.8 Ω; Delphi IMV: 5.0-5.8 Ω; Denso SCV: 1.5-2.5 Ω. Heat the valve with an industrial heat gun to 80°C and re-measure. Resistance must rise smoothly without open-circuit spikes (infinite resistance), which indicate broken internal copper wire bonds.
High-Voltage Insulation Resistance Test
Using a Megohmmeter set to 250V or 500V DC, test insulation resistance between each VCV terminal pin and the metal valve body. The resistance must exceed 10 MΩ. Any reading below 10 MΩ indicates internal insulation breakdown where drive current arcs to the engine block, tripping driver protection in the ECM.
Oscilloscope Current Clamp Waveform Analysis
Reinstall the VCV (with new oiled O-rings). Connect an oscilloscope current clamp (20A or 60A range) around one of the two harness wires. Start the engine and observe the current waveform at idle. You should see a clean sawtooth current waveform averaging 1.0A-1.4A. Look for jagged current dips or erratic current spikes that indicate the mechanical valve spool is sticking inside its sleeve.
Wiring Harness Continuity & Dynamic Load Test
Disconnect the ECM main harness connector. Measure continuity on both wires between the ECM and VCV plug (must read < 0.4 Ω). Perform a circuit load test using a 12V 21W automotive bulb connected across the power and ground lines to verify that the harness can support 2.0 Amperes of operating current without high-resistance voltage drops.
Low-Pressure Fuel Delivery Pressure & Vacuum Test
Connect a fuel pressure gauge to the inlet of the high-pressure fuel pump. Measure feed pressure during idle and full throttle. Electric lift pump systems must deliver 4.5-6.5 bar stable pressure. Internal mechanical suction gear pumps must pull between -0.3 and -0.45 bar vacuum. A restricted fuel filter will starve the VCV of fuel, creating erratic pressure response that mimics a metering valve failure.
Hårdvarureparation och stycklista för komponenter
High-Pressure Pump Fuel Quantity Control (Inlet Metering Valve / MPROP)
0 928 400 660 / 0 928 400 706
Regulates low-pressure fuel flow into high-pressure pumping chambers via PWM signal
F 00R 000 756 / 1 110 010 015
Mechanical safety pressure dump valve preventing overpressure rail rupture
F 00N 200 098
Prevents air ingress and internal bypass leakage at the metering unit flange
Interaktiv toleransberäknare för Common Rail
Tillhörande bränslesystemkomponenter
The following genuine OEM fuel pumps and common rail injectors are verified factory equipment for engines reporting fault protocol P0002. Cross-reference operating pressures and tightening torques before sub-assembly replacement:
0445110021BOSCH
BOSCH 0445110021 - F9Q 1.9 dCi Common Rail Injector
View Technical Specs & Fitment →0445110369BOSCH
0445110369 Injector: VW 2.0 TDI EA189 CFFB CFHC Specs
View Technical Specs & Fitment →095000-5471DENSO
095000-5471 Denso Isuzu 4HK1 Injector: 8-97329703-4 Specs
View Technical Specs & Fitment →06H127025NBOSCH
BOSCH 06H127025N High Pressure Fuel Pump Audi A4 A5 Q5 VW Tiguan 2.0 TFSI EA888 Gen2 0261520141
AG9Z-9350-BBOSCH
BOSCH AG9Z-9350-B High Pressure Fuel Pump Ford Edge Fusion Focus ST Taurus 2.0L EcoBoost 0261520152
04E127025BBOSCH
BOSCH 04E127025B High Pressure Fuel Pump VW Golf Tiguan Jetta Audi A3 1.4 TSI EA211 0261520216
View Technical Specs & Fitment →Återställning av pumpinläring och provkörning
Following the replacement, cleaning, or overhaul of the Fuel Volume Control Valve (VCV/IMV) for DTC P0002:
1. Clear all stored trouble codes from the Engine Control Module using a diagnostic scan tool.
2. Access ECM Special Functions -> 'Reset High-Pressure Fuel Pump / Volume Control Valve Adaptation Values'.
3. Switch ignition OFF and wait 60 seconds to allow the ECM main relay to power down and save non-volatile memory.
4. Perform a low-pressure fuel system bleed: cycle the electric lift pump 3 times for 30 seconds each (via scan tool active test) to purge air.
5. Start the engine and idle for 10 minutes without touching the accelerator pedal to allow the ECM to calibrate minimum drive current and rail stability offsets.
6. Conduct a road test including deceleration fuel cutoff sequences to calibrate overrun rail pressure decay rates.
Differentialdiagnos & Relaterade felkoder
Verkliga verkstadsfall
2016 Ford Transit 2.2 TDCi (Puma ZSD-422)(175,000 km)
Vanliga tekniska frågor
Vad betyder felkoden P0002?
Felkod P0002 indikerar att motorstyrenheten (ECM/PCM) har detekterat en prestanda-, korrelations- eller rimlighetsavvikelse i den elektriska drivkretsen för bränslemängdreglerventilen (VCV), även benämnd sugreglerventil eller ingångsmätventil (IMV/SCV). I moderna common rail-dieselsystem (såsom Bosch CP1H, CP3, CP4, Delphi DFP3 och Denso HP3/HP4) är mängdreglerventilen monterad direkt på högtryckspumpen för att dosera volymen lågtrycksbränsle som släpps in i pumpelementens kompressionskammare. P0002 sätts när ECM:s interna shuntmotstånd för strömövervakning registrerar att den faktiska styrströmmen avviker från kalibrerade börvärden, eller när responsen i bränslerailtrycket avviker från den förväntade volymetriska reglerkurvan i sluten reglerslinga.
Vilka är de vanligaste symtomen på P0002?
Check Engine Light (MIL) illuminated continuously on the dashboard, Engine hard starting, extended cranking times, or intermittent no-start conditions, Engine surging, hunting, or unstable rpm fluctuations at idle and during light throttle cruise, Sudden engine stalling during deceleration or when coming to a complete stop at intersections, Severe loss of vehicle power with ECM locking into Limp-Home mode, Audible intermittent diesel combustion rattle or sharp knocking caused by rail pressure spikes.
Vad orsakar P0002 på en dieselmotor?
Mechanical sticking, varnish buildup, or metal debris jamming the precision spool inside the Fuel Volume Control Valve (VCV/IMV); Internal electrical coil breakdown, thermal resistance drift, or intermittent open winding inside the VCV solenoid; High electrical contact resistance, terminal pin fretting corrosion, or loose female pins in the VCV two-pin connector; Chafed, pinched, or partially broken wiring harness wires between the ECM and the high-pressure pump metering valve; Severe fuel contamination (water, gasoline, particulate debris) causing loss of diesel lubricity and valve plunger scoring; Failing ECM internal current-sensing shunt resistor or damaged low-side MOSFET driver transistor.
Är det säkert att köra med felkod P0002 aktiv?
🟡 Varning: Halta-hem-läge / Uppsök verkstad
Vad kostar det att åtgärda felkod P0002?
Typiska reparationskostnader för felkod P0002 beror på den bakomliggande orsaken och diagnostiknivån: Nivå 1 (Mindre underhåll / Gör-det-själv): 400 kr - 950 kr: Rengöring av kablage och kontaktdon, kontroll av skavda kablar till ventilen (Rengöring av givare, bränslefilterbyte, säkringskontroll eller kontaktstiftsrengöring.); Nivå 2 (Komponentbyte): 1 300 kr - 3 800 kr: Byte till original Bosch/Delphi bränslemängdventil IMV/VCV (Byte av enskild komponent (tryckreglerventil, doseringsventil eller renoverad spridare).); Nivå 3 (Större delsystem): 9 500 kr - 24 000 kr: Komplett byte av högtryckspump CP4/CP3 (Översyn av högtryckspump, ny OEM-spridaruppsättning eller byte av DPF-enhet.). Verkstadsriktpriser. Mer än 70 % av fallen åtgärdas inom nivå 1 eller 2 utan att hela delsystem behöver bytas.
Can I replace just the VCV without replacing the high-pressure pump?
Yes, provided there are no metal shavings or debris inside the pump! If the valve has simply failed electrically (open coil) or suffered varnish stick-slip from low-quality fuel, installing a new VCV with fresh O-rings will completely solve DTC P0002.
Why does a faulty VCV cause engine surging at idle?
The ECM continuously adjusts the VCV PWM current in microsecond increments to maintain rock-steady rail pressure. If the valve plunger is sticky, it resists movement until current builds up, then jumps too far. This causes rail pressure to oscillate wildly by 50-150 bar, making engine idle hunt and surge.
What is the difference between a VCV (Inlet Metering) and a PCV (Rail Regulator)?
The VCV (Volume Control Valve / IMV) meters low-pressure fuel entering the high-pressure pump. The PCV (Pressure Control Valve / DRV) is mounted on the common rail and dumps excess high-pressure fuel back to the tank. Modern common rail systems use both valves to manage rail pressure efficiently.