Hi to all just joined today.

I bought a 2003 Honda Jazz few days ago and all seemed fine..............

Yesterday i noticed what looked like black electrical tape over the engine light.
Removed the binnacle surround and sure enough there was a small square tape covering it.

Took it to my local garage that i have used for years for my Landrover (workhorse) , the fault coming up was EGR valve (car has clearly had a new EGR valve fitted) reset the fault and light went out revved engine light stayed off, put car in reverse to back out of garage and light comes back on again after couple seconds , put back up on computer and same fault was there again cleared but came back on again.

I have taken out and cleaned the MAP sensor and replaced .

Would really appreciate some advice on what else this could be, 1 week previous i was stung for £1000 on a Clio, bought Honda to avoid issues with french cars.

Is there a history of wiring issues around this area?

Any other faults that would show up EGR when on computer?

Why would someone go to hassle of tape over engine check light instead of fixing?

 

Go to an auto shop and ask them to see if they can pull out any codes for you, that way you can pinpoint what is wrong and needs fixing rather than pulling and replacing random parts

 

SieGunso — it sounds to me like that's exactly what kendo51 was doing.

Kendo — Can you enquire of whomever you bought the car from as to the history of the problem? If it's a garage or dealer, I'd ask them to make it right as selling the car with the light taped over sounds a lot like misrepresentation of its condition. If it's a private party sale, you might at least be able to find out what the original diagnosis was (if any was made).

It's possible, though somewhat unlikely, that the new EGR valve could be faulty or the wrong one for the car. It's also possible that the "stuff" around the valve may need cleaning or replacement—vacuum hoses, the piping or whatever on either side of the valve, etc.

 

Thanks for getting back I appreciate it ,

Have it book in for diagnostics with main Honda dealer on Monday (big Bucks)at the minute trying to rule out anything obvious so as not to get ripped off again!.

Car was bought of part-time seller advertising as a private seller(he gets cars direct from main dealers that are traded in then sells on), I called him yesterday and he seemed shocked and annoyed and asked me as he has no garage to get it looked into and we can come to an arrangement.

Update: Today I have removed air filter and vacuumed out air box as was full of crap, filter was ok but had some debris vacuum this also (Shop closed to get new one), noticed where the air box meets throttle body that the rubber connecting the 2 was not fitted correctly given opportunity for un filtered air to enter throttle body fixed this then started car and sprayed in some cleaner into the throttle body.

Disconnected the neg on the battery left for 30min to reset the EML which it did, started car was revving it etc let idle for approx 10 mins no issue with the light, pushed in clutch selected reverse and just as i let clutch out light came back on . Question surely if there was a fault in EGR system light would come on right away or while revving not understanding it flicking on when reverse is selected etc.

Took for a short run and the lumpyness at low rev is gone maybe connecting rubber between airbox and throttle body cured this time will tell

Disconnected neg again to reset to see if EML was same if i selected 1st gear only rolled forward in fist no light selected reverse light on after few seconds? maybe just coincidence.

Glad for your help please keep thoughts coming for thing to check.

 

So the EML only comes back on if you put it in reverse? Sounds like an electrical issue. There may be a short somewhere. I'm assuming you have a standard transmission? Electrical gremlins can be difficult to find and this one doesn't seem like a quick answer

 

It is indicating this way not sure if it is just coincidence though, yea standard transmission

Just took the new EGR of that was fitted by previous keeper/dealer it is clean as a whistle and valve is lifting free enough, had a thought though, I have been thinking cant be the EGR as it was newly fitted but is there a possibility it is faulty / wrong type ? it looks right but no makers mark just these 2 lots of numbers one above the other in front of the electrical socket 50F20215 and 13132126 can anyone confirm if this is familiar to them or what their replacement type was?.

Thanks again for your help and advice new to this .

 

This has been a long time problem in UK Fits since they came out. Most people have done what you have tried and some get better and some don't. I imagine the previous owner did what he could, indicated by the new EGR valve, and just covered the MIL when nothing would work.

If this bothers you a great deal you could remove the EGR valve AND the housing that it is bolted too and clean that.

There are also passages covered by the exhaust and intake manifolds that become clogged that could be causing the problem but are a major pain in the butt to get at.

So unless you need the light cleared to pass any inspections I would just leave the MIL covered and drive it.

 

Mmm not sure my OCD would be content with leaving as is , whatever it is it is also effecting the MPG as it is only around 30 at best and the idle isn't always constant.

 

Bit of an update if anyone can help me further,

Took jazz to Honda dealer who put on their computer, fault came back as EGR valve fault, due to low voltage P0489.

Has anyone a wiring diagram of this circuit for 2003 ? found this one Wiring Diagram not sure if it is for a 2003 model

I want to test at plug to see if it is getting voltage to the coil on EGR not 100% what is positive and neg , the black is showing going to ground (neg) is the blue red positive and is this circuit just a coil to energise EGR? what are the other wires doing/going to? yellow /blue sensing voltage ? not too sure.

 

have you tried cleaning anything?

The fact it is NOT throwing the code right away is telling me its throwing the code for EGR flow.

It takes a few minutes for it to notice there is no flow.


Take the stuff apart and clean it up.

use brake cleaner, and old toothbrush, rags, pipe cleaners, whatever, just get the passages looking clean.

there is also a 2 bolt pipe to exhaust. make sure its clean also inside

 

Hi Thanks for your reply,

There is a new EGR valve on the car and have have taken the other part its mounted too off and cleaned as well , have also cleaned the plug with contact cleaner, im prity sure there is a break in the cabling somewhere , battery is showing 13.1v volt at rest and 14.6v running so alternator is charging fine, having trouble getting correct wiring diagram the colours of the cable at the plug are 2 green /blue wires 1 yellow/blue 1 blue/ red and 1 white/black .

 

Here's a link to an online service manual

http://hondafitjazz.com/manual.htm

Looks like in the wiring diagram you'll want the ECM diagram 20. Near the lower middle is the EGR valve and EGV valve position sensor. Doesn't look like the colors match up with your wires tho. I'll try to take a look at my EGR valve today and see the colors that are on mine for reference. Hope this helps!

 

That would be great thanks for all your help.

 

Just give you an update,

After exhausting anything i could do with the car i took it to an auto electrician who traced the fault back to the ECU pin E4 not producing correct voltage so ECU has to be sent of for repair approx £350 , as they had not had any issues with Jazz in this area their best guess is that car had previously been jump started incorrectly. Hope this helps anyone with a similar issue.

Thanks to all for your advice and help.

Will keep you posted on how ECU repair goes

 

holy crap

might as well buy a second hand ecu instead of spending that much!

 

Hi , Do any off you know how i can get the number of the ECU in my jazz without removing it? Dealer? , or is there a step by step pictorial for taking it out.

 

Be very careful before you spend money on an unneeded new ECM. This EGR problem has been around since early days in UK Jazz and NONE of them needed a new ECM to solve the problem. Try this Brit site I think this is the one I found many many threads and possible solutions on:

Clubjazz - Index

Do you really think a bad jump would select the EGR circuit to destroy passing by other more suitable circuits?

If they are so sure ask them if they instal a new ECM and it doesn't solve the problem would they take it out and refund your money?

I think you need to find a new garage.

 

First of all let me say thank-you for all the assistance you have gave me.

The auto electrician who diagnosed the fault in the ecu to begin with is not my usual garage 1st time i had been with them.

As you have correctly said , when i took car yesterday yo a tuning specialist he ran full test on the ecu and an official Honda diagnosis which showed all correct voltages where coming out of ecu to egr valve , had never thought valve was at fault as is looks brand new and when i bought car they said as much also.

Auto-tune guy yesterday said that auto electrician had got it wrong and the 1.2volt for 10ms is meant to come from the egr back to the ecu which the egr is not doing .

Im on search for an EGR valve I found 1 on a blue print part website for 118 pounds sterling , is this reasonable?

Once again thank-you

 

ON Ebay for around $50 US

 

Bit of distance for it to come , is the carriage not expensive im in N.Ireland