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Honda HDS HIM to Diagnose engine speed fluctuated intermittently
by Eobd2 BMWICOM Chian obd2 scanner supplier centerA 2005 Honda Accord sedan driver told me that his car, with mileage of about 160,000 km, using CM5 engine, was instable at idle, there must be something wrong with the engine.
After the pick-up, I used Honda HDS HIM,
with the newest software version: V3.012.023 and detected two fault
codes: P0511---idle speed control system failure and P2195--low A / F
sensor signal. I tried to accelerate to 1 200 r / min ~ 2 500 r / min in
neutral position, the engine speed was constantly changing, but came to
be normal over 2 500 r / min. Then I shifted into driving gear and
reverse gear, the engine speed was normal, no longer appears unstable
phenomenon.
Because the meaning of P0511 is idle control system
failure, I checked the relevant lines and intake system. All cylinder
pressure was within the normal range after measurement. After replacing
the throttle body, intake air temperature sensor and spark plugs, the
failure occurs again after running for a while. Then I had to replace
the electronic control unit and re-tested, the fault still occurs.
Careful examination of the relevant line also found no abnormalities.
Maintenance came to a deadlock.
Unexpectedly, I re-started the
engine and found out the problem. There was no voltage signal in the
line (black / red) leading ECU to an idle speed control valve, and it
was not broken over. Therefore, along this line, I found the connector
terminals exists loose connection, resulting in bad contacts, even
worse, connectors was erosive.
Finally, I used obd2 scanner repaired the connector terminals, and above fault was shot.
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Created on Dec 31st 1969 18:00. Viewed 0 times.
