If you have some time and skills and the EGR you have looks new I would first check the passages in the exhaust and intake manifold first. They are pretty much filled with post combustion residue even on a good running Jazz GD.

At least start by looking at the housing under the EGR. Take the EGR off only two bolts then the housing has two nuts holding it to the block.

Take the housing off and look in the passages if they are clean then the manifolds should be too. But if it is filled with "slime" then I would say it would be worth it to clean them too.

Watch this video he takes off that EGR housing to remove and replace his alternator.

https://www.fitfreak.net/forums/fit-...lternator.html

 

Hi , I had the EGR off when EML was throwing up EGR fault it is clean as a whistle as is the body EGR is bolted too , according to the in depth examination of the fault it is to do with the inner electronic working to do with the position sensor. Have bought a new EGR today, weather is fowl and have no where inside to work on it think it is to clear up for tomorrow will warm up engine , clear current fault and fit the new EGR fingers crossed it works

 

Well , Bought new EGR valve £116 weather cleared this evening took car a drive to warm up, came back cleared fault fitted brand new out of the packet EGR valve went back out a drive 30 yards in fault light back on , back to house rechecked fault same code P0489 low voltage EGR reset fault and it came back on again when reversing out of drive, so £116 down the drain for nothing , looks like the ECU's which never fail has infect failed.

 

What about this ..... 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.

So even though it is working correctly you are going to spend big bucks to replace it?

 

Im at a loss 1 place was sure it was ECU and another sure it was EGR valve , anywhere I read said ECU never fail , so i replaced the EGR which has not fixed the problem, so it has to be ECU right? what else can be causing it?

 

Try clearing the code, then immediately after code is cleared, turn the car off completely, key out, and pop the hood and remove the battery negative cable.

Let it sit for a while.


Perhaps your car simply needs a full reset. Clearing codes and then removing battery ground should do the trick.


Its very strange that you are having issues.

Are you 100% sure the CABLE is plugged in properly, and nothign is preventing it from getting a good connection? they may have measured at the plug, but did they measure it from the EGR side?

I dont think it can possibly be a bad EGR or ECU at all, at this point.

I really think any issues will be from the wiring plugs.


Try this reset and see what happens. Leave it sit unhooked from battery for at least 10-15 minutes

 

Hi , They tested on the cables EGR side couple inches from the EGR plug its self (not through the plug)using an insulation split tool . They ran a Honda test programme for EGR circuit on the laptop while hooked into car diagnosis socket which they said showed the ECU working correctly, thought when i fitted the new EGR i would be sorted im very frustrated with it at the minute.

I had in the beginning cleaned the contacts at the EGR plug with contact cleaner. Do you know is there a way of removing the connections in the EGR plug on the wiring harness to check they have a good connection to the cables on the plug pins?

It is really hard to accept that the ECU may have failed on 1 cable only to the EGR circuit, I will try what you have suggested tomorrow and let you know if you have any more thoughts please let me know.

Was thinking of checking what the auto electricians have done as i think they cut into the cable before the plug at the ECU and the plug at EGR to tested for continuity maybe if i tested through plugs to check , would i do any harm if i disconnected neg at battery, unplugged EGR circuit at ECU and EGR valve and tested between the plugs

 

No harm at all.

 

Hi , Well have checked all the above things suggested, reset the ECU with code reader and turned of ignition removed the key, removed neg battery lead for 20mins (in between this I checked the wiring right through the plugs EGR to ECU with no problems). Still at a loss

 

O.O WOW DAMN!!!
Hope you get this fixed & sorted good luck with it.
Must be killing/annoying the hell out of yaaa ):

 

I've bit the bullet and left it into Honda, I contacted Honda U.K and they are going to come to a some sort of a part goodwill gesture will keep you posted on solution / costs in the end.

 

Good news I hope they find your problem. If they do it will be a big help to our UK members.

 

Any news or update champ?
Hope all has been well & you manage to solve the problem.

 

Honda are to ring me tomorrow when they finish their full diagnosis , although I had this done already elsewhere they said they need to check themselves to prove the fault to stand over any subsequent repairs. Im hoping at the back of my mind its not ECU, I checked over everything i had a schematic for 1 thing i could not find schematic for to check was how the cold temp sensor interacts with the EGR anytime i reset the fault EML stayed off until the cold temp light went out then EML came on about 5 secs after, im wondering if cold temp sensor sends signal to ECU and in turn to EGR and might simply be cold temp sensor problem think im clutching at straws/ thinking of costs, will keep you all posted when i get any progress thanks for your interest.

 

GOOD NEWS of sorts.

Honda Ballymena got back to me this morning, fault is with the ECU.

Initial costs where meant to be 4 hours labour to investage the fault approx £200 inc vat and £880 inc vat and fitting for new ECU total of £1080 inc vat.

After discussions with Honda U.K total bill for everything is going to be £565 which i am pleased with well done to Honda U.K on their goodwill gesture to help repair the car, they have won a customer my next car will be from Honda. Although not ideal the extra money having to be paid out i'd rather wee car was right.

 

Congrats on solving the issue ^_^

 

Has the problem MIL been turned out yet?