Volvo 819 E - Ez-116 K

Group 28 Ignition systems
Des ign and funct io n System descriptions
147 III
8
EZ-116K
B 234 F, B204E and B230F
The control un it (1) computes the optimum timing on the bas is of information from the .... arious sensors . Th e power
stage (2) makes and breaks the current in the primary winding of the ignition co il (3) in response to ignition pulses
from th e con trol unit . The high - tension current thereby induced in the secondary is supplied to the appropriate spark
plug (5) by th e distributor (4).
The con tro l unit also supplies signals to the diagnostic unit (7) used f or fault tra cing and monitoring purposes.
The ignition setting computed by the control un it is based on t he follow i ng i nformation :
- Engine speed
and crankshaft position are indic ated by the speed/position pick-up (6).
- Engine
kno ck is detected by the knock sensor (8 ).
- The fue l in j ection system ( lH -2.4) control unit (9) transm i ts eng ine load si gnals from the air mass meter .
-
Engine temperature is indi c ated by the temperature sensor (10).
- Closure of the throttle is ind icated by the throttle switch (11).
•
The control unit can vary the timing from approx. 55 · before TOC to <Ipprox . 5
Q
after TOC .
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