Fiat 1995 Brava, Service Manual

Page: 231 / 544

Bravo-Brava
Engine
Fuel system
10.
HITACHI SYSTEM CONTROL UNIT PIN-OUT
P4A21BJ01
Connector A
1 0 1 . Operation of injector for c y l i n d e r 1
1 0 2 . N.C.
1 0 3 . Operation of injector for c y l i n d e r 2
1 0 4 . Pump relay o p e r a t i o n
1 0 5 . Operation of injector for c y l i n d e r 3
1 0 6 . Negative f o r charcoal filter s o l e n o i d valve
1 0 7 . Earth
1 0 8 . Earth
Connector B
1 . Operation of c o i l for cylinder 1
2. Operation of c o i l for cylinder 3
3. Operation of rev counter
4. N.C.
5. N.C.
6. Earth
1 0 9 . N e g a t i v e for e n g i n e idle a d j u s t m e n t s o l e n o i d valve
1 1 0 . O p e r a t i o n of injector for cylinder 4
1 1 1 . Positive for e n g i n e idle a d j u s t m e n t s o l e n o i d valve
1 1 2 . C o n t r o l unit s u p p l y
1 1 3 . C l i m a t e c o n t r o l compressor relay f e e d (if f i t t e d )
1 1 4 . N.C.
1 1 5 . N.C.
1 1 6 . Earth
7. O p e r a t i o n of coil for cylinder 3
8. O p e r a t i o n of coil for cylinder 4
9. O p e r a t i o n of electric fan l o w speed relay
10. O p e r a t i o n of electric fan high speed relay *
1 1 . O p e r a t i o n of system failure l i g h t
12. Earth
Connector C
13. N.C.
1 4 . Positive for air f l o w meter
1 5 . Positive for c o o l a n t temperature sensor
16. Positive for L a m b d a sensor
1 7 . Signal for three stage pressure s w i t c h (if f i t t e d )
18. N.C.
1 9 . N.C.
2 0 . Connection w i t h FIAT C O D E
2 1 . Positive for d e t o n a t i o n sensor
2 2 . Negative f o r air f l o w meter
2 3 . Line K
2 4 . N.C.
25. S i g n a l for butterfly p o s i t i o n sensor
26. N e g a t i v e for l a m b d a sensor
2 7 . N.C.
2 8 . S i g n a l for e n g a g i n g compressor (if f i t t e d )
29. A W signal f r o m i g n i t i o n s w i t c h ( + 5 0 )
3 0 . N.C.
3 1 . Earth f o r d e t o n a t i o n sensor
3 2 . N e g a t i v e for c o o l a n t temperature a n d butterfly p o s i t i o n
Connector D
3 3 . Positive for e n g i n e rpm sensor
3 4 . Positive for e n g i n e t i m i n g sensor
3 5 . Earth for e n g i n e r p m sensor
3 6 . Signal for v e h i c l e speed sensor
3 7 . Positive for butterfly p o s i t i o n sensor
3 8 . N.C.
3 9 . Control u n i t s u p p l y
4 0 . Earth
4 1 . Negative f o r e n g i n e rpm sensor
4 2 . N e g a t i v e for e n g i n e t i m i n g sensor
4 3 . N.C.
4 4 . C a l i b r a t i o n selection
4 5 . T r i m level selection ( t o earth for versions w i t h o u t c l i -
m a t e c o n t r o l )
4 6 . C o n t r o l unit s u p p l y
4 7 . C o n t r o l unit s u p p l y
4 8 . Earth
* Short circuited at pin 9 for versions w i t h o u t climate c o n -
trol
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VI-96 - Cancels and replaces
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