Volvo 819 E - Page 50

Group 28 Ign ition systems
Design and function System descriptions
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Control unit connections
1. Receives power from battery (1) lh rough ignition switch (2).
2. Transmi
ts speed signal to fuel system control unit (217)
4. Connected
to ground by throttle switch (19 8) when throttle is closed .
5. Transmits fault signals to test terminal (267) when fault tracing with test diode.
6. Receives engine speed and crankshaft position signal from Hall generator in distributor (5).
8. Re ceives signa l from knock sensor (218).
9. Transmits igni tion pulses to power stage (133).
1
0. Re ce ives 12 V supp ly on closure of thermostat (2 24).
11 . Grounds con lrol unit (260).
12.
Grounds screen of lead from Hall generator in distributor (5).
13.
Supplies power to Hall generator in distributor (5).
14. Rec eives load signal from fuel system control unit (217).
15 . Grounds screen of knock sensor (218) lead.
Power stage connections
1. Controls current in igni t ion coil (4) primary w ind ing.
2. Grounded.
3. Grounds screen of lead connected to termina l 5.
4. Receives power from battery (1) across igni tion switch (2 ).
5. Receives ignition pulses from con trol unit (260).
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