31686560
BOSCH 31686560 High Pressure Fuel Pump Volvo XC90 XC60 S90 V90 2.0L Drive-E T6 Twincharged 0261520295
31478796, 31375549, 0261520295, 0261520476Integrated High-Speed Digital Flow Control Valve (FCV)-200 barTechnical Specifications
| Specification | Value |
|---|---|
| System Type | Bosch HDP5 Mechanical High Pressure Fuel Pump |
| Operating PressureCore Spec | |
| Actuation Type | Exhaust camshaft dedicated pump lobe driving roller tappet |
| Mounting Flange Bolt Torque | 13 N·m (alternating diagonal progressive tightening) |
| High Pressure Pipe Torque | 25 N·m Flare Nut Connection |
| Flow Control Solenoid Resistance | 9.8 - 12.0 Ω at 20°C (ECU digital metering valve) |
| Common Fault Codes | P0087 (Fuel Rail Pressure Too Low), P0088 (Rail Pressure Too High), P1193 (Fuel Delivery Error) |
| Workshop Precaution | Lubricate internal roller follower with clean engine oil prior to inserting into cylinder head bore |
Matched High-Pressure Fuel Pump (Fuel Circuit Assembly)
Operates on the same high-pressure rail circuit. When troubleshooting low rail pressure (DTC P0087), verify pump volumetric delivery before replacing injectors.
Installation Tips
- [
- {
- "step": 1,
- "title": "Depressurize Fuel Rail & Remove Acoustic Cover",
- "instruction": "Depressurize fuel rail via diagnostic scan tool or fuse isolation. Remove upper engine acoustic shroud to access the cylinder head rear."
- },
- {
- "step": 2,
- "title": "Disconnect Fuel Feed Hose & Steel High Pressure Union",
- "instruction": "Detach low pressure quick-release fuel supply hose. Unscrew high pressure steel pipe flare nut (25 N·m) with backup counter-wrench."
- },
- {
- "step": 3,
- "title": "Unbolt Mounting Fasteners & Inspect Roller Lifter",
- "instruction": "Loosen two M6 Torx mounting bolts evenly in half-turn increments to relieve spring tension. Remove pump and inspect camshaft roller tappet for scoring."
- },
- {
- "step": 4,
- "title": "Fit New O-Ring, Torque Bolts Evenly & Check For Leaks",
- "instruction": "Install replacement O-ring with fresh engine oil coating. Torque mounting bolts alternately to 13 N·m. Tighten steel line to 25 N·m. Test run engine."
- }
- ]
Diagnostic Trouble Codes & Fault Protocols
Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift:
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.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.