Volvo 819 E - Page 105

Group 28 Ignition systems
Fault tracing , Rex-I
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N29
Check ignition coil/power stage ground connec-
tions
Measure resistance between terminal B in 3- pole con-
nector and
ground. Resistance must not exceed 0.1
ohm. If resistance is too high, clean ground connection
and/ or replace ground lead as required .
Measure resistance
between terminal A in 2-pole con-
nector and
ground . Clean ground connection and/or re-
place ground lead as required if resistance exceeds 0.1
o hm .
224
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N30
Check signal lead between ignition coil/power
stage and control unit
Connect buzzer between terminal B in 2-pole connec-
tor and terminal 16 in control unit connector.
Buzzer should sound if lead is intact .
N31
Persistent failure of engine to start despite absence of
faults or correction of fault(s} which have been located
indicates internal
fault in control unit or power stage.
Verify
by installing new control unit or new power
stage.
Reinstall
ignition coil. Reassemble control unit connec-
tor and reconnect to unit.
Reconnect ignition coillpower stage connectors .
Check
that no new fault codes are displayed.