HITACHI
12641740
View Specs
SolenoidHitachi High-Pressure Gasoline Direct Injection Pump (GDI HPFP, 150 bar)Euro 56
HITACHI 12641740 High Pressure Fuel Pump Chevrolet Equinox Malibu Impala Buick Regal Verano 2.4L LEA 2.0L LHU HM10008 HPP0006
Engine Platform:GM 2.4L Ecotec SIDI DOHC 16V (LEA / LAF / LUK) →
OE REFERENCE
12608371, 12633423, HM10008, HPP0006, GDP103, 217-3440CONTROL VALVE
-NOZZLE
-RAIL PRESSURE
150 barEMISSIONEuro 5 / Euro 6
WARRANTY12 Months
02
Vehicle & Engine Fitment
03
Technical Specifications
| Specification | Value |
|---|---|
| part_number | 12641740 |
| oem_reference | 12641740 |
| manufacturer | HITACHI |
| system_type | High Pressure Fuel Pump |
| pressure_rating | 150 bar (2175 psi) |
| operating_temperature | -40°C to +135°C |
| flange_mount_torque | 15 N-m (11 lb-ft) |
| high_pressure_line_torque | 30 N-m (22 lb-ft) |
| diagnostic_dtc | P0087, P0089, P0172, P0300 |
| Operating PressureCore Spec |
04
Installation Tips
- Depressurize the fuel system completely via diagnostic scan tool or by removing the fuel pump fuse prior to line disassembly.
- Clean all surrounding bracket areas thoroughly using residue-free brake cleaner to prevent abrasive particulate ingress.
- Inspect the mechanical camshaft lobe and roller follower or clean injector bore seating surfaces before hardware alignment.
- Install component using fresh factory O-rings or Teflon combustion chamber seals lubricated only with clean motor oil.
- Torque mounting flange fasteners in alternating increments to 15 N-m (11 lb-ft).
- Torque high-pressure hydraulic tube fittings using a calibrated flare nut wrench to 30 N-m (22 lb-ft).
- Prime low-pressure fuel circuit, cycle ignition key 3-4 times, and inspect for high-pressure hydraulic leaks before road test.
Tips & Warnings:
- Always replace single-use high-pressure metal fuel lines and micro-filter seals whenever disconnected.
- Verify camshaft driving lobe surfaces for scoring or flat spots before installing any mechanical pump.
- Reset long-term and short-term fuel trim adaptations via OBD-II diagnostic scanner after physical replacement.
05
Diagnostic Trouble Codes & Fault Protocols
Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift:
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.
WORKSHOP PROTOCOLS
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.
COMMON RAIL WORKSHOP DIAGNOSTICS
Read Technical ProtocolCommon Rail High-Pressure Pump Diagnostics Guide
COMMON RAIL WORKSHOP DIAGNOSTICS
Read Technical ProtocolFuel Metering Valve (IMV/SCV) Diagnostics Guide
OBD-II DIAGNOSTIC PROTOCOL
Read Technical ProtocolP0087 Low Rail Pressure Diagnosis Guide
COMMON RAIL WORKSHOP DIAGNOSTICS
Read Technical Protocol