Installation and adjustament manual
19/26
PROGRAMMATION
0.95 bar is displayed, indicating the correct operation of
the electrovalve.
5.6 Operation diagnoses
The operation diagnoses screen (Fig 5.7) allows the
operator to see possible component and system
malfunctions that can occur during alternative fuel
operations.
The malfunctions that can be shown are:
Safety Relay: this device is engaged if there is power to
the LPG electrovalves as well as the cut-off electrovalve,
notwithstanding that the ignition key is turned off.
LPG Electrovalve: short-circuit or power interruption on
LPG electrovalve.
Cut-off Electrovalve: short-circuit or power interruption
on LPG electrovalve.
Excessively low temperature: after the switch-over to
LPG, the regulator-vaporizer’s temperature has become
excessively cold.
Mixture too rich for Integrator 1: stepper motor 1 has
stayed at its minimum cross-section for too long.
Mixture too lean for Integrator 1: stepper motor 1 has
stayed at its maximum cross-section for too long.
Mixture too rich for Integrator 2: stepper motor 2 has
stayed at its minimum cross-section for too long.
Mixture too lean for Integrator 2: stepper motor 2 has
stayed at its maximum cross-section for too long.
Lambda Sensor Inoperative: the sensor has reduced its
efficiency beneath an acceptable level, or the electrical
circuit is interrupted.
MAP troubles: malfunctioning or disconnected sensor.
See Fig. 5.7. The following is displayed beside each check-
up point: an enabling box, an “effect” column, and the
current status of the checkup.
The enabling box shows the activation of the selected
check-up if a check-mark is shown. The inactive enabling
boxes (in grey), indicate that those check-ups cannot be
either enabled or disabled by the operator. Conversely,
the active enabling boxes allow activation or deactivation
Fig.5.7
Fig.5.8
of the pertinent check-up simply by clicking on the box.
Each check-up corresponds to a certain strategy that the
ECU performs when the malfunction occurs. The strategy
cannot be modified, but it can be viewed in the EFFECT
column.
The possible effects are:
No Effect: when the malfunction occurs, the ECU only
signals the error for as long as the engine is on, in the
following manner:
-
the red L.E.D. flashes slowly.
Petrol Fuel change-over: when the malfunction occurs,
the ECU only signals the error for as long as the engine is
on, in the following manner:
-
the red L.E.D. flashes slowly
-
the green L.E.D.s bar of the switch is turned off
-
the system switches to petrol mode
Forced Petrol Operation: the ECU defaults to petrol
operation, while indicating malfunction by slowly flashing
the red L.E.D. and turning off the green L.E.D.s bar for as
long as the problem is not corrected.
Finally, the check-up status is displayed in the STATUS
column with one of the following displays:
OK: no error
ERROR: the check-up indicates an error and the ECU
has behaved as displayed in the EFFECT column.
Only the check-ups that are enabled (check-mark in the
enabling box) can display an error. To reset the status of
the checkups, click on the RESET button. This button is
at the bottom of the STATUS column. The MODIFY
button makes it possible for the operator to send a new
configuration of enabled controls to the ECU.
In the diagnosis screen it is possible to see the hours of
operation during both LPG and petrol mode, expressed in
hours and minutes.
5.7 ECU parameter modifications
The screen ECU PARAMETER CHANGES (Fig 5.8)
allows the operator to modify the data in the ECU. To this
purpose, it is necessary to click on the MODIFY button.
Click on the EXIT button to go back to the ECU MANA-
GEMENT menu.
