Injectors
| Injectors |
The injectors are of solenoid type with needle and seat. They open when a current flows through the coil and are closed by a powerful spring when the current is cut.
To achieve optimum combustion and thereby cleaner exhaust gases, the injectors have air-flushed jets to give a good distribution of the fuel.
Air is fed to the injectors from a passage in the intake manifold. Air from in front of the throttle is led to the passage via a bypass in the throttle body.
The injectors must not be rotated; the connectors must point straight up. Otherwise, the fuel will hit the walls of the intake passages and affect emissions and driveability.
The injectors are identical on all 4-cyl engines.
The injectors are supplied with current from the main relay, while the control module grounds them as follows:
| • |
Injector 1 is controlled from pin 45.
|
|
| • |
Injector 2 is controlled from pin 44.
|
|
| • |
Injector 3 is controlled from pin 67.
|
|
| • |
Injector 4 is controlled from pin 68.
|
|
The microprocessor controls the transistor in the firing order so that injection is completed just as the inlet valve in the cylinder in question opens.
| Diagnostics |
| • |
If there is an open circuit or short circuit to ground or B+ on any of the injectors, diagnostic trouble code P1676 will be generated.
|
|
System reaction to a fault
| • |
Closed loop is blocked.
|
|
This project is supported by memberships and donations. If you use this site, please consider Joining SCNA and/or making a donation.
Our Friends
