Volvo 819 E Service Manual page 50

Group 28 Ignition systems
Design and function
EZ - 102K
Control unit connections
1. Receives power from battery
2. Transm its speed signal
4. Connected to ground
5. Transmits fault signals
6. Receives engine speed and
8. Receives signal from knock
9. Transm its ignition
10. Receives 12 V supply
11 . Grounds con lrol unit
12. Grounds screen of
13. Supplies power t o
14. Receives load signal
15. Grounds screen of
Power stage connections
1. Controls current in ignition coil (4)
2. Grounded.
3. Grounds screen of
4. Receives power from
5. Receives ignition pulses
48
System descriptions
..
60
(1) l h rough
to fuel system control unit
by throttle switch (198) when throttle
t o test terminal (267)
crankshaft position
sensor (218).
pulses to power stage (133).
on closure of thermostat
(260).
lead from Hall generator in
Hall generator in distributor (5).
from fuel system control unit
knock sensor (218) lead.
primary
lead connected t o termina
battery across ignition
from con trol unit
ignition switch (2).
(217)
when fault tracing with
signal from Hall generator in distributor
(224).
distributor (5).
(217).
w inding.
l 5.
switch (2).
(260).
test diode.
(5).
4