Volvo 819 E Service Manual page 103

28
Group Ignition systems
Fault tracing, Rex-'
:
;
"
T -
23
,
, ,
,
,
, '
,
:
11
'
23
,
,
,
,
10
,
, ,
,
,
,
:
,
'
1 3
1 2
222
•
•
,
•
_-
•
•
1
_
144 8 11
1
2
144 818
144
Check pulse generator
Measure resistance
(red) and 23 (blue).
Resistance shou
1 17
Check that screen is connected
Check knock
Undo knock sensor connector and
and 2.
Measure resistance
(green) in control
o ohm.
If resistance
(open-circuited). Remove
lead separately
lead(s).
If leads are
torque 20± 5
Reconnect knock
819
between connector
ld be approx. 240 ± 25
to terminal
sensor leads
between terminal 12
unit connector. Resistance
is too high one or
jumper and
with ohmmeter.
intact. replace knock
Nm (15 ± 3.5 ft Ib).
sensor connector.
N24
terminals 10
ohm.
11 .
N25
bridge terminals 1
(black) and 13
should be
both leads is faulty
measure each
Replace damaged
sen sor. Tightening