Repair manual

Injection lead electronic control
Injection lead, or the start of fuel delivery expressed in degrees, can differ from one injection to the next, even from one cylinder
to another and is calculated similarly to delivery according to engine load, namely, accelerator position, engine rpm and air admitted.
Lead is corrected as required:
- during acceleration
- according to water temperature
and to obtain:
- r educed emissions, noise abatement and no overload
- better vehicle acceleration
High injection lead is set at start, based on water temperature.
Delivery start feedback is given by injection electro valve impedance variation.
Engine start
Cylinder 1 step and recognition signal synchronization (flywheel and drive shaft sensors) takes place at first engine turns. Accelerator
pedal signal is ignored at start. Star delivery is set exclusively based on water temperature, via a specific map. The center enables
the accelerator pedal, when it detects flywheel acceleration and rpm such as to consider the engine as started and no longer drawn
by the starter motor.
Cold start
Pre-post reheating is activated when even only one of the three water, air or gas oil temperature sensors records a temperature
of below 10 _C. The pre-heat warning light goes on when the ignition key is inserted and stays on for a variable period of time
according to temperature, while the intake duct input resistor heats the air, then starts blinking, at which point the engine can be
started.
The warning light switches off with the engine revving, while the resistor continues being fed for a variable period of time to
complete post-heating. The operation is cancelled to avoid uselessly discharging the batteries if the engine is not started within 20
÷ 25 seconds with the warning light blinking. The pre-heat curve is also variable based on battery voltage.
Hot start
On inserting the ignition key the warning light goes on for some 2 seconds for a short test and then switches off when all reference
temperatures are above 10 _C. The engine can be started at this point.
Run Up
When the ignition key is inserted, the center transfers data stored at previous engine stop to the main memory (Cf. After run),
and diagnoses the system.
After Run
At each engine stop with the ignition key, the center still remains fed by the main relay for a few seconds, to enable the
microprocessor to transfer some data from the main volatile memory to an non-volatile, cancelable and rewritable (Eeprom)
memory to make tem available for the next start (Cf. Run Up).
These data essentially consists of:
- miscellaneous settings, such as engine idling and the like
- settings of some components
- breakdown memory
The process lasts for some seconds, typically from 2 to 7 according to the amount of data to be stored, after which the ECU sends
a command to the main relay and makes it disconnect from the battery.
SECTION 3 - INDUSTRIAL APPLICATION 55
F3C CURSOR ENGINES
Print P2D32C005 E Base - May 2007