Volvo 819 E - Page 98

Gro up 28 I gnition sy stems
Fa ult tracin g, R ex-'
Engine does not start
NB
Check control unit and power stage ground
connections
Ground leads (brown and bl ac k) sh ould be t igh ten ed
securely to terminals on intake ma nif ol d.
N9
146 724
Check for spark at spark plugs
Caution! Fuel system cont rol unit may be destroyed if
spark s tr ikes injector or uni t wiri ng .
Disconnect
HT lead from one spark plug and con n ec t
to spare plug.
Ground plug and opera te st arter motor.
tf powerful blue-white spark is present : Fa ult is located
in en
gine or fuel syst em .
Nl 0
tf spark is weak or absent : Connect plu g and HT l ea d
direc
tl y to ign ition coil HT ter mi nal. Grou nd plug a nd
operate starter motor.
If spark is still weak or absent , fault is l oc at ed in igni.
tion coi l or igni t ion syst em LT circ uit (see N11·N36).
If powerful blue-white spark is now present , check
rotor,
distribu tor cap and HT leads. Replace as reo
quired.
146 12'0
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