Technical Forums» Technical / Performance» checking O2 sensor
marchsrilanka » CMF Member Ratnapura Sri Lanka Member since: Posts: |
checking O2 sensor |
Sat 15 May 2010 03:27:16 AM |
Hi,
I need to check the O2 sensor and found the below steps. * Turn the ignition key to the ON position but do not start. Orange "Check engine" light will illuminate along with oil pressure light etc. * To access error code retrieval mode use a small piece of wire, e.g. paperclip, to connect the bottom left two pins for approximately 2 seconds. * Disconnect wire. * After approximately 2 seconds "Check engine" light will start flashing fault codes. Long flashes are tens, short flashes are ones, e.g. 5 long flashes followed by 5 short flashes is code 55 = normal. * To check O2 sensor, start engine. Light ON=rich, OFF=lean. -------------------------------------- Problem is that I don't have a RPM meter installed to run for 2000rpm.... so is this step mandatory? After checking the O2 sensor, how may I exit from fault codes? Is it done by just switching off the engine? Also I really appreciate if you guys can makeout a pdf on how to clean the "Idle Control Valve" with pics just as the re-soldering guide. Coz we have unclear points like, how to adjust the idle after completion etc. I really appreciate the help given by forum members to fellow micra lovers. Please help. Thanks in advance. |
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: checking O2 sensor |
Sat 15 May 2010 06:01:11 AM |
you just need to hold the revs steady, and there are loads of threads if you do a search for "idle" marchsrilanka :)
(eg http://micra.com.au/community/message.php?messageid=28318 frank |
mycra » CMF Member melbourne Australia Member since: Posts: |
Re: checking O2 sensor |
Sat 15 May 2010 12:58:09 PM |
I checked the o2 sensor by tanking it out fist, get a multimeter and burn the o2 sensor with a lighter and see if the readings change consistently. or just quick attach a air/fuel gauge...
as for idle control valve is fairly simple. remove the 2 screws and take it out be careful of the o-ring. clean with a throttle body cleaner, also do the gasket. adjust idle by leaving the engine on idle and turn a PLASTIC(be carefull dont damage it) screw. also there are heap forums on this. good luck |
marchsrilanka » CMF Member Ratnapura Sri Lanka Member since: Posts: |
Re: checking O2 sensor |
Sat 15 May 2010 02:46:01 PM |
Thanx Frank & Mycra for your replies. Will keep you updated :)
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marchsrilanka » CMF Member Ratnapura Sri Lanka Member since: Posts: |
Re: checking O2 sensor |
Sat 15 May 2010 11:42:06 PM |
Guys, I did a sensor check and got 5 long flashes and 5 short flashes. So I think the condition of the sensors are ok. But as my micra is getting difficult to start once the engine gets hot, I thought of cleaning the ICV as well..... the result was amazing... now it starts right on the first time.. I need to take it to a ride and will update you if I notice any issues. Thanks a lot again!
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marchsrilanka » CMF Member Ratnapura Sri Lanka Member since: Posts: |
Re: checking O2 sensor |
Sun 16 May 2010 03:29:01 PM |
Hi guys,
In some occasions, I still find it difficult to start and once I start, can see some black smoke going. Yesterday I did a sensor check and all the sensors were fine (5 long and 5 short flashes). I even cleaned the ICV. So what could be the problem? |
frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: checking O2 sensor |
Sun 16 May 2010 05:00:35 PM |
coolant temp sensor maybe marchsrilanka ? (effectively leaving the choke on)
frank |
marchsrilanka » CMF Member Ratnapura Sri Lanka Member since: Posts: |
Re: checking O2 sensor |
Sun 16 May 2010 05:54:03 PM |
yes i also think its the coolant temp sensor... but frank the sensor check didnt give any error code for coolanet sensor. Thanx for your support.
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: checking O2 sensor |
Mon 17 May 2010 06:01:43 PM |
i dont think the obd1 diagnostic system is very sophisticated tbh marchsrilanka, i would test the c/t/s personally (2500 ohms @ 20deg c, and 300 ohms @ 80deg c)
frank |
marchsrilanka » CMF Member Ratnapura Sri Lanka Member since: Posts: |
Re: checking O2 sensor |
Mon 17 May 2010 08:11:29 PM |
thanx frank... i will check it and see ... thanx a lot!
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