Volvo 819 E - Page 100

Gr oup 28 Ignit ion sys tems
Fault
tracing , Rex-I
Switch on ign iti on
Connect test lead to socket 6.
Measure
voltage between control unit connector termi-
nail (yellow /red) and ground . Instrument should read
approx . 12 V. Depress pushbutton . Voltmeter should
now read 0 V.
N15
Measure voltage at di agnostic unit connector if voltage
is not present at control unit or if instrument reads 12 V
with pushbutton depressed .
N IB
Checking diagnostic unit
Ou
J=I
1 2'1 I
,
~
V
§
~
..
..
-
i- -
.~
NIl
At di agnostic unit
Me. sur e voltage betw ee n connector blue leltd a nd
ground
Volt mete r should read approx . 12 V.
.. ,..,
M en ure resi stan ce betw een connector bt ec k I. ltd and
ground
Ohmmeter should read 0 ohm .
Switch oft igniti on
NI B
Measure resistance between diagno s tic unit test
lead and pin (No . 8) under function selector
Ohmme t er sh ou ld read infin ity (00).
Press function selector button.
Ohmmeter should now read 0 V.
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