Volvo 819 E - Diagnostic System

Gro up 28 I gnition systems
D esign and function - System descriptions
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AOC
REX- I
1 Banery
2
Ignition switch
5 Distributor
6 Spark plug
12/7 Check engine warning lamp
84 Coolanttemperalure sensor
86 Speedometer
t98 Thron le switch
218 Knock sensor
260 Re;l( -l contr ol unit
41 3 Speed/positio n pick-up
420 Power stag
eligni t ion coil
473 Regina control unit
482 Diagnostic unit
1 6. Transmits ignition pulses to power stage/ignit ion coil (420). Power stage inte r rupts supp ly to coil whe n signal
goes
low (0 V).
17. Transmits engine speed signals to Reg ina control unit (473) terminal 1.
18. Spare.
19. Spare.
20.
Grounds co ntrol unit (260).
21. Spare.
22 . Spare.
23.
Receives engine speed and crankshaft pos i tion signals from speedlposit ion pick-up {4131 for computation of tim -
ing.
24. Spare.
25. Spare.
Power stag eli gnit i on co il conn ecti ons
a Grounds power stageJignition coil 14201(signal ground).
b
Rece iv es ig nition pulses from co ntrol unit (260)lerminaI16 . Control unit permits charging of coil through power
stage wh ite signal remains high (5 V) . Power stage opens terminal B ground connection when signal goes low
(0 VI. R esultant high tension generated in ignition coil is distributed by distributor (5) to appropriate spark plug
(6}.
A Receives supply from battery (1) across ig nition switch (2).
B Gr ounded (supply ground).
C Tr
ansmits signals cor r esponding to number of igni tion pulses to speedometer (86) in combined inst ru me nt .
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