checking O2 sensor

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.
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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.

you just need to hold the revs steady, and there are loads of threads if you do a search for "idle" marchsrilanka
(eg https://micra.org.uk/cmf/message/28318

frank

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

Thanx Frank & Mycra for your replies. Will keep you updated

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!

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?

coolant temp sensor maybe marchsrilanka ? (effectively leaving the choke on)

frank

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.

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

thanx frank... i will check it and see ... thanx a lot!