Check Burn-Off Cleaning Oil Air Mass Meter Hot Wire; Check Co Content - Volvo 240 1989 Service Manual

Checks
Fue(system LH2. 4 240
E27
Check burn-off cleaning of air m ass m eter hot
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CO
NOTE ! Engine must be hot. Coolant tempera­
ture must exceed 60°C (140"F).
1.
Remove protective rubber sleeve from air mass
meter co nnector without disconnecting it from the
unit.
2.
Connect voltmeter between connections 1 and 4.
Rev engine to approx. 35
rls
(2,100 rpm). Turn off
engine. After approx. 4 seconds, the voltmeter indi ­
cator should swing back and forth for approx. 1
second (burn-off cleaning).
Remove voltmeter.
Install rubber sleeve over connector.
E28
Check CO conten t
" the engine does not run satisfactorily even
though no faults have been fou nd, o r
If
fau lt s that
have been found have b een rectifi ed, try using a
new confrol unit.
Remove all test equipment.
Reinstall electrical distribution unit. panels, etc.
50