16790-5A2-A01
KEIHIN 16790-5A2-A01 High Pressure Fuel Pump Honda Accord CR-V Odyssey 2.4L Earth Dreams K24W GE190-019
GE190-019, 296100-0040Integrated Electromagnetic Flow Control Solenoid-200 barTechnical Specifications
| Specification | Value |
|---|---|
| System Type | Keihin Mechanical Single-Piston High Pressure Fuel Pump |
| Operating PressureCore Spec | |
| Drive Mechanism | Exhaust camshaft 4-lobe drive profile operating roller tappet |
| Mounting Flange Bolt Torque | 12 N·m (tighten evenly in progressive alternating passes) |
| High Pressure Pipe Torque | 28 N·m Flare Nut Connection |
| Flow Control Solenoid Resistance | 8.5 - 10.5 Ω at 20°C (PCM PWM duty cycle regulated) |
| Common Fault Codes | P0087 (Fuel Rail Pressure Low), P0088 (Rail Pressure High), P0172 (Fuel System Rich - Oil Dilution) |
| Workshop Precaution | Inspect camshaft roller follower for pitting and replace pump O-ring with clean engine oil lubrication |
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 High Pressure Pump Cover",
- "instruction": "Depressurize fuel lines via fuel pump relay removal. Remove engine cover and pump sound insulation bracket atop cylinder head."
- },
- {
- "step": 2,
- "title": "Disconnect Low Pressure Feed Line & Steel High Pressure Flare Nut",
- "instruction": "Disconnect low pressure rubber supply line with quick-release tool. Unscrew high pressure steel line flare nut (28 N·m) with backup counter-wrench."
- },
- {
- "step": 3,
- "title": "Unfasten Mounting Bolts Evenly & Inspect Roller Tappet",
- "instruction": "Loosen two mounting bolts (12 N·m) alternately in half-turn steps to relieve spring tension. Lift pump and inspect roller tappet and camshaft lobe."
- },
- {
- "step": 4,
- "title": "Fit New O-Ring, Torque Bolts Evenly & Verify Pressure Integrity",
- "instruction": "Install replacement O-ring with fresh engine oil coating. Torque bolts alternately to 12 N·m. Tighten steel fuel line to 28 N·m. Start engine and verify zero fuel leaks."
- }
- ]
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.