Honda CR-V 1997 Service Manual page 352

Idle Control System
Idle Control System
! POSOS! The scan tool indicates Diagn ostic Trouble Code (DTC) P0505: Idle control system malfunction.
NOTE: If DTC P1508 is stored at the same time as DTC P0505, troubleshoot DTC P1508 first, then troubleshoot DTC P0505.
Possible Cause
• lAC valve mechan ical malfunction
• Throttle body clogged port, improper adjustment
• Intake manifold gasket leakaging
• Intake air hose loose leakaging
• Vacuum hose leakaging
• EeT
sensor incorrect output
• Throttle Position sensor incorrect output
Troubleshooting Flowchart
- The Mil has been reported on.
- Ole P0505
is stored.
Problem verification:
,
.
Start the engine . Hold the
engine at
3,000
rpm
with
no
load (in Park or neutral) until
the radiator fan comes on, then
let
it
idle.
2. With the scan tool, check the
following items.
- Throttle position should be
approx. 10% with the throt-
tle full y closed .
- Engine coolant t empera-
ture should be 194 - 205°F
190 - 96"C).
If they are not within the
spec., repair th e faulty sen-
sor circuit.
3 Check the engine speed at
idle with no-load conditions:
headlights. blowe r fa n. rear
defogger. radiator fan , and air
co nditioner are not operating .
Is it
750 (730)*
±
50
rpm?
"-
YES
!
Intermittent failure, system is OK
I
/' !
at this time.
NO
"-
NO
Is it 700 (680)* rpm or less?
/'
YES
"
V
B
. ; '99 - 00 models
(To page 11 -151)
(To page 11-1511
11-150