Volvo 819 E - Page 23

Group 28 Ignition systems
Design and function Speed and crankshah position information
5V Js
OV ,
A1
Ie I
,
A2
I I
L
At Signal increases from 0 to 5 V. Control unit starts to compule tim i ng of ne)(l ignition pulse .
A2 Signal faits from 5 to 0 V. Conl ro l unit commences ignition counldown and delivers ignition pulse as computed .
8 Posit
iv e flank. Hall el ement unaffected by magnetic field.
C
Negat ive flank . Hall element Influenced by magnetic field .
A Hall
generalor is used on TZ·28H ( with a 12 V reference si gnal) , EZ-l02K , EZ ·117K and EZ -118K sys tems .
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