Author Topic: 2012 Jazz suddeny loses power and Yellow light comes on...  (Read 2412 times)

Jocko

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #45 on: May 08, 2022, 03:52:15 PM »
Speak to ECU testing. See what they have to say.

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #46 on: May 08, 2022, 05:39:32 PM »
Thanks Joko , I'll try to speak to them tomorrow when they open.

They gave me very little information by phone or email last week so my expectations are low this time around,

joe

sparky Paul

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #47 on: May 08, 2022, 08:46:32 PM »
I've had a quick flick through the thread, I can see that you had the ECU repaired, but it's not clear what happened with the injectors.

Was the injector on the misfiring cylinder replaced? Do you know if any were swapped around for the purposes of fault finding?

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #48 on: May 09, 2022, 12:25:05 PM »
Hiya

I was told the the diagnostic involved swapping them around which pointed to the ecu,

I have called www.ecutesting but I get a call handler (as I suspected) who could give me no information.
I have put in a tech request,

thanks, joe

sparky Paul

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #49 on: May 09, 2022, 02:31:04 PM »
The injector on the original misfiring cylinder should have been replaced.

This is a known issue with the mk2 Jazz ECU, I think there was another thread about this last year. A shorted injector solenoid can be the cause of damage to the ECU output, and there is some suspicion that a slowly failing injector, specifically deterioration of the solenoid insulation, can also lead to the same outcome.

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #50 on: May 10, 2022, 12:07:35 PM »
Hiya

Thanks for this suggestion. The fault code after the ecu repair related to a different cylinder/ Injector.
 This time not #3 but #1. In this case do think both injectors are at fault?

I'm losing confidence in the repairs and the car as it's now been 1 month of problems so your advice is appreciated,

thanks, joe

JimSh

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #51 on: May 10, 2022, 03:52:57 PM »
I think SP is suggesting that the injectors may not have been swopped back again.
I found this on the internet which may or may not be of any use.

https://www.700r4transmissionhq.com/bad-fuel-injector-symptoms-honda-jazz/

https://clubjazz.org/forum/index.php?topic=10333.0
Edit added second link
« Last Edit: May 10, 2022, 04:28:25 PM by JimSh »

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #52 on: May 10, 2022, 07:50:11 PM »
Hiya

Thanks for pointing me at the 2 articles.

I looked at the articles but am still no clearer about the source of the problem as I can't test the injectors myself.
I've now been to 3 garages but nobody is sure about a solution.

"IIRC failure of injector outputs is a known fault on the ECU of the mark 2. Really, the suspect injector needs to be tested, rather than the usual "change this and see if it fixes it" approach."

I'll have to wait and see what they say this time at www.ecutesting.com but have lost trust in my car sadly,

Thanks, joe

sparky Paul

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #53 on: May 10, 2022, 11:10:27 PM »
First thing that needs to be done is to see what the problem is with cylinder #1. If the same fault is suspect, then it needs to be checked with either an oscilloscope on the ECU output, or a Noid light, not by random swapping.

If ECU #1 output is now faulty, then the ECU may well have to go back to ECUtesting again. Not sure if they will fix under warranty, perhaps best not to go into too much detail... I'm a bit surprised they didn't point out that the offending injector should be replaced.

If the ECU output looks good, then the injector needs to be checked and/or replaced. A simple resistance check against a new/good injector will probably show up a faulty one.

Note that the problem with these injectors is electrical, not mechanical.
« Last Edit: May 10, 2022, 11:12:31 PM by sparky Paul »

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #54 on: May 11, 2022, 12:18:54 PM »
Hi Paul

Thanks, I really appreciate this clear explanation though I don't know whether this was what the original diagnostic garage did.

They were sure the ECU was at fault and said they'd tested to see if cylinder 3 was getting the correct signal to open and shut- which it wasn't. Now the fault code is for cylinder 1 of course...

When ecutesting come back to me I hope to have a clearer idea of how to proceed as it's now been a 6 week process,

joe

lukebutler73

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #55 on: June 03, 2022, 05:41:02 PM »
Hi Shantijoe,
How are things going with the repair? I'm having the same issue and have used the same company for repair however havent replaced the injectors yet

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #56 on: June 04, 2022, 12:38:12 PM »
Hiya

the current situation is that the car was towed into an electronics specialist 2 weeks ago but it took a week before they even looked at the car...

Injector 1 was showing a lower voltage and they have ordered a new one from Honda (they say though reports on this forum suggest they are unavailable..?).

Delivery delays and bank holiday delays mean I should hear back next week.

So far 8 weeks of issues with this but I'll report back with an update, joe

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