General System

Description
This system supplies the necessary fuel at constant pressure to the injectors.
Fuel is metered and injected into intake manifold and intake port according to the injection control signals from the Powertrain Control Module Engine (PCME).
This system consists of fuel pump, fuel filters, pressure regulator, pulsation dumper, solenoid valve (Pressure regulator control), and injectors.

Secondary Injector Operation
The secondary injectors supply extra fuel enrichment above 2750 rpm when the engine load/ fuel demand exceeds an amount pre-programmed in the PCME.

The total fuel injection amount is determined by engine speed, intake manifold pressure, intake air temperature and atmospheric pressure.

For troubleshooting the secondary fuel injector, please refer to Computers and Control Systems/ Trouble Code Charts/ Diagnostic Trouble Codes (DTC) No. 71 and 73.