Electromagnetic Fuel Nozzle - PGO Tigra AF-125BAE Service Manual

11-5 Electromagnetic fuel nozzle

Function:
Subject to ECU, the fuel nozzle injects atomized fuel into the engine in the specific timing.
Constitution:
EV-Cup; clamp; EV
Principle:
Developed by the fuel nozzle coils with electrical pulse supplied from ECU, the magnetic force will increases
to overcome a resultant force composed of the return spring's pressure, the needle valve's gravity, and friction
and makes the needle valve lifted and fuel injected. The needle valve's lift range is not more than 0.1mm. With
the pulse thereof interrupted, the needle valve is closed again by the return spring's pressure.
Fault diagnosis:
The system does not diagnose any fault of the nozzle itself but the nozzle driving system. Any PCODE will be
displayed on the dashboard in the event of a short circuit (or overload) between the nozzle driving system and
the battery or a short (open) circuit between the nozzle driving system and GND. In case of any situation
thereof, the close loop control of the Lambda sensor and prior self-learning control is terminated; the latest
self-learning data is employed. Delete the PCODE with any fault eliminated.
Requirements for installation
A. For easy installation, please apply the clean silicon-free engine oil on the surface of the top O-ring
connecting the fuel manifold. Be careful of no engine oil contaminating the nozzle and orifices.
B. Install the nozzle by hands; do not strike the nozzle with a hammer.
C. The O-ring should be replaced during disassembly and installation of the nozzle. Do not damage
the nozzle's sealing face.
D. The supporting washer on an O-ring should not be removed from the nozzle. Do not damage any
part on the nozzle such as fuel inlet, O-ring, supporting ring, orifice plate, and outlet. Do not use
any damaged part thereof.
E. Perform an airtight test for the nozzle's parts and ensure no leakage with installation completed.
F. Remove any defective part by hands. Take out the clamp and then the nozzle from the nozzle cap.
G. Keep a removed nozzle clean without any contamination.
Fuel Injection System 7
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