Volvo 819 E Service Manual page 62

REX-I
Control unit connections
1. Transmits signals to
propriate diagnostic
2. temperature
unit supplies one of
ternally.
3. Grounds connection
strument, illuminating 'Check
4. Spare.
5. Receives supply from battery
6. Receives supply from battery
7. Receives signal from throttle
curve which is speed-dependent
8. Receives engine load signal
10. engi ne speed and crankshaft
ing .
11 . Connection for screen of lead from speed/position pick-up
12. Grounds screen of lead from
13. signal from knock sensor
14. Spare.
15. Spare.
__
•
• b ,.B
diagnostic un it (482) when fault
functions are selected .
signal from temperature
NTC resistors in sensor
when certain types of fault
engine' warning lamp
for self-diagnostic program memory.
(1)
across ignition switch (2)
(1)
switch (198) when throttle
only.
from Regina control
position
knock sensor
(218) for retardation of tim ing in cyl inder affected by
Design
86
traci ng . Signals are
sensor (84) for
with constant voltage
are present in system.
(1217).
terminal
is fully closed
unit (473) fo r computation
signa ls from speed/position pick-up
(413).
(218).
28
Group
and function - System descriptions
,
198
transmined by diagnostic
timi ng compensation.
and measures resulting
Grounding closes circuit
15.
. Control unit respond
of timing .
(413) for computation of
knock.
Ignition systems
•
84
un it when ap-
if required. Control
voltage level i n-
to combined
by selecting timing
tim-
6'