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Troubleshooting Flowchart
H I G H
-
The MIL ha3 been rcoortod on.
-
OTC P0171 andlor PO'l72.re
3tored.
ls the Iuel pressure OK?
ls the fuel pressure too high
Chock th€ luel p.essure regulator,
and tu€l return pipe.
Ch€ck the Primary HO2S:
1 . S t a r t t h e e n g i n e . H o l d t h e
engine at 3,000 rpm with no
load (in Park or neutral) until
the radiator lan comes on.
2 . C h e c k t h e P r i m a r y H O 2 S
{ S e n s o r 1 ) o u t p u t w i t h t h e
scan tool.
Chock the tuel pump, fuel feod
pipe, fuol fiher, and tuol prcssure
regulator.
Does it stay at less than 0.3 V
or more than 0.6 V?
Rapl.ce the Primary HO2S {Sen-
3or ll.
Check lor a sticking or l€aking
E V A P p u r g e c o n t r o l s o l e n o i d
With a vacuum pump, apply vacu,
u m t o t h e E V A P p u r g e c o n t r o l
solenoid valve.
Does it hold vacuum?
Chock the valvc cl6a.ance3 and
adjust it nocessary. lf th. valvo
c l o a r a n c e 3 a r e O K , r e D l a c o t h G
tuel ini€cto6.
1 1- 77
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Table of Contents
Troubleshooting
