B
08.06
53
CHAPTER
PAGE
ISSUE
ELECTRIC SYSTEM TROUBLESHOOTING
ENGLISH
SECTION 2
Signal System
SECTION 2
B
- TROUBLESHOOTING
BACKLIGHTING AND INDICATOR LIGHTS
1
Neutral indicator light function
The indicator light should come on when the status
of input n°15 (connector) is low, which means that
the shift lever is in neutral position.
2
Oil indicator light function
The system receives information for activation of
the microcontroller on the basis of the status of
input n°12.
3
Radiator fluid temperature indicator light function
The system receives information for activation of
the microcontroller on the basis of the information
recorded by the resistive probe, which is connected
to the instrument board by means of input n°13 of
the connector; when temperature recorded by the
system is higher than 90°C, the alarm indicator will
come on. A connection failure of the resistive probe
to the instrument board will be signalled by the LED
flashing.
4
Fuel level indicator light function
The system receives information for activation of
the microcontroller on the basis of the status of input
n.6.
5
Turn indicator light function
The system should activate the indicator light when
the status of input n°2 or n°3 of the connector is
high, which means that the turn indicators are on.
The signal must reach the instrument board
alternated.
6
Troubleshooting indicator light function
This indicator light is activated by the control unit
that signals, by means of different timers, the
presence of faults involving the vehicle (input pin
17).
If the control unit detects a fault, the indicator light
will come on as follows:
-
when engine is running, the light is always on
-
when engine is off but key is on, the light flashes
in accordance to a sequence identified by a two-
digit code, where the first digit indicates a long
sequence and the second a short one
-
long sequence means that the light comes on
for a 1 second and goes off for 1.5 seconds;
-
short sequence means that the light comes on
for 0.5 seconds and goes off for 0.5 seconds;
-
the sequence is repeated regularly with a 3
second pause (lamp off) between each cycle
Codes are:
-
for the water temperature sensor: 21
- for the a
i
r temperature sensor: 22
-
for the solenoid: 57
In the event of multiple errors, the control unit will
signal them one after the other (three seconds in
between), starting with the ones identified by a higher
code. Signalling is stopped when the error has been
removed (the sequence is any case completed).
7
LCD backlighting function
Backlighting is always present and is orange-
coloured.
