Honda Civic Service Manual page 435

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Troubleshooting Flowchart
' l
N O
a-,-:- -
YES
-
The MIL ha3 b€on rePorled on.
-
DTC P0171 a^dlot P0172 arc
stored,
is the fuel pressure OK?
Check the fuel pt€ssure regulator
and fusl re{urn pipe.
ls the fuel pressure too high
ortoo low?
Check 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
Ioad (in Park or neutral) until
the radiator Ian 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,
Check the tu6l pump. fuel leed
pipe, fu€l fiher, and Iuel Pressure
regulator.
Does it stay at less than 0.3 V
or more than 0.6 V?
Check lor a sticking or leaking
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, aPPIY vacu-
u m t o t h e E V A P p u r g e c o n t r o l
s o l e n o i d v a l v e f r o m t h e i n t a k e
manifold side.
D o e s i t h o l d v a c u u m ?
Check the MAP sensor outputr
1. Turn the ignition switch ON (ll)
2. Check the MAP with the scan
t o o l .
Check th6 response of the MAP
sensoa:
1. Start the engine.
2. Check the MAP with the scan
tool.
l s a M A P o f 4 0 . 0 k P a 1 3 0 0 m m H g ,
1 2 . 0 i n H g ) o r l e s s i n d i c a t e d w i t h i n
one second after starting the
e n g i n e ?
-
Check th€ valve cloarance.
-
Check the EGR rystem lD16Y5
enginel.
-
lf they are OK, r€place the tuel
iniocto]3.
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