The supply controlled by the ignition (INT)
for the instrument
E50
reaches pin 2 of connector A from
the line protected by fuse
F1
of the junction unit
B1
.
Pins 3 and 4 of connector A are earthed.
The instrument
E50
is also supplied
directly by the battery - pin 1 of connector A - via the line for
the maxifuse J/B1of
B5
protected by fuse
F10
of
the junction unit
B1
(supply for internal clock).
The methane pressure sensor
K54
,
located on the adjustment solenoid valve, receives a reference earth
and supply from the engine management control unit
M10
-
pins 30 and 33 - and sends a signal proportional to the pressure
of the methane to the control unit
M10
- pin 46 and to the
instrument
E50
pin 11 of connector B.
This signal, processed by the electronic
device inside the instrument, operates the gauge and the reserve
warning light. Pin 5 of connector B is earthed to indicate the type
of supply of the present version (methane); pin 4 of connector B,
normally used on the petrol versions, is not connected here.
Insufficient engine oil pressure is signalled
to pin 2 of connector C from the earth signal coming from the sensor
K30
.
The signal from the sensor
K20
.
reaches pin 5 of connector C and lights up the brake pad wear warning
light.
Signals from handbrake switch
I40
and brake fluid level sensor
K25
reach pin 8 of connector
B and pin 13 of connector C for
E50
, respectively. and light
up the insufficient brake fluid level/handbrake warning light. The
same warning light is on - together with the ABS failure warning
light - if the ABS control unit detects problems involving the EBD
function (
See E7020 ABS
).
The speedometer sensor
K84
, located
on the gearbox, sends signals to the instrument panel
E50
to pins 8 and 9 of connector C: these signals, processed by the
internal electronic device, operate the vehicle speed indicator
and milometer and the output is available: from pin 10 of connector
C for the engine management control unit (
See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
),
from pin 3 of connector B for the navigation system control unit
(
See E4090 NAVIGATOR
).