Volvo 819 E Service Manual page 101

Gro up 28 Ignition systems
Fault Rex-I
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20
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220
I
12V
V
on
---
....
test lead
Connect
and black
LED is operating
tion.
Replace diagnosl
Check for
Switch on ignition
Measure
nal 6 (blue)
12 V.
Switch off ignition.
,,2
Check control unit
Measure
(brown )
Resist ance should
Check temperature
M easure
black) and ground
Ohmmeter
,"'813
If value is
1 0 determ ine whether
sensor or
n
....
.
. . . .
diagnostic
red probe on diode tester
probe to t est lead .
correctly if diode tester gives indica-
ic unit if no indication
voltage at control
vol tage between control
and ground. Vol tage
ground lead
resistance between
and ground .
be 0 ohm.
sensor
resistan ce between connector t erminal
.
reading shou ld agree
Measure sensor
sensor or
lead as appropriate.
. .
.
I I ' L
. ' :
..
111
,_
· •• ·u • • • • •
•• .. .. •••
to pin under LED
is observed.
N19
unit
unit connector termi-
should be approx.
N20
connector t erminal 20
N21
2l redl
with adjoining chart.
resistance directly
lead is faulty. Replace
•• ..
... ... '" • • •