Honda CR-V 1997 Service Manual page 327

Troubleshooting Flowchart
-
The MIL has been reported on.
-
OTC P0171 and/ or P0172 are
stored ,
I
Check the fuel pressure .
I
NO
"-
Is f uel pressure OK?
/ '
I
YES
Is the fu el pressu re too high
HI GH
I
Check the fuel pressure regulator
I
or too low? I and fuel return
pipe.
Check the Primary H02S:
I
LOW
1. St art the engi ne . Ho l d th e
en g in e at 3,000 rpm w ith no
Check the fu el pump, fuel f.ed
load (in Park or neut ral) unti l
the ra di ator fa n comes o n.
pipe. fuel fitter. and fuel pressure
2. Check th e Prim ary H02S
regulator.
(Se n so r 1) o ut p ut wi th th e
scan t oo l.
I
Does it stay at less than 0.3 V
YE S
or m ore than 0.6 V?
Replace the Primary H02S.
I
NO
Check for a sticking or leaking
EVAP purge control solenoid
valve:
With a vacuum pump, apply vacu-
um to t h e EVAP p urg e co ntr o l
solenoi d va lve from t he i nt ak e
manifold side.
I
NO
Replace the EVAP purge control
Does it hold vacuum?
/'
solenoid valve.
I
YES
Check the valve clearances and
adjust if necessary . If the valve
clearances are OK, replace the
fuel injectors.
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