Author Topic: 2012 Jazz suddeny loses power and Yellow light comes on...  (Read 6345 times)

Shantijoe

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2012 Jazz suddeny loses power and Yellow light comes on...
« on: March 31, 2022, 12:35:48 PM »
Hi All

This car has only 40K miles and has been trouble free until now.
It started losing power 10 minutes from home but managed to get home on low revs.

I've seen an older thread about the Throttle Position Sensor and Ignition Coil Sensor Wire.
I don't have the device which reads out the fault so hope someone has more experience than I do before I have it towed to a garage?

Many thanks, joe  :o

embee

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #1 on: March 31, 2022, 02:31:26 PM »
Basic OBD2 readers can be got very cheap these days, between £10 and 20 typically. It might well be worth getting one just to see what codes it comes up with, very easy to use, plug in and follow the instructions, a couple of button presses usually.
Basic ones will only give you the system at fault, not necessarily the actual reason (e.g. difference between open circuit or short circuit) but it'll tell you where to start, for example "cylinder 3 misfire".

You never know it might be something very simple you can fix yourself and be well worth the cost.

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #2 on: March 31, 2022, 02:42:52 PM »
Thanks for replying, I'll try a code reader as you suggest.
I'm wondering if breakdown services carry them? I'm with Green Flag,

best wishes, joe

embee

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #3 on: March 31, 2022, 03:11:12 PM »
If your breakdown cover will include getting them out to look at it, they'll certainly be able to see what it says is wrong, OBD2 fault codes is usually the first thing they'll check.

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #4 on: April 05, 2022, 04:21:04 PM »
Thanks for the Code Reader advice!

P0203 and P0303 are both Cylinder 3 misfire codes so rather than drive it 200 miles home I've taken it to a garage I haven't used...

I hope it's a faulty connection or Spark plug as at only 40K miles a Fuel Injector replacement would be beyond my pension,

any advice before I start negociating with the garage would be very welcome,

Many Thanks, joe

embee

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #5 on: April 06, 2022, 11:01:54 AM »
Ignition is way more likely than fuel, quite a few others have had this issue. I'm sure someone will point you at the likely culprit from their experience (my Jazz is later and different). Coils are a likely candidate from what I've gleaned, usual thing is to swap coils between cylinders and see if the fault goes with it.

Good you identified the issue, it helps show the garage that you are clued up.

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #6 on: April 06, 2022, 05:42:21 PM »
Hiya

Thanks for your advice. The garage just called and think it's the Engine Management System which needs replacing.
I'm going to ask them to swap the coils as you suggest... watch this space,

best wishes, joe

Jocko

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #7 on: April 06, 2022, 10:07:46 PM »
Better take out a second mortgage.

embee

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #8 on: April 07, 2022, 12:09:32 AM »
I would suggest that the ECU (engine/electronic control unit) is probably the least likely thing to go wrong. Sounds like the garage are just employing the "shotgun" diagnostic system, throw something in there and see what it hits, then say it's probably that. Do they actually have any evidence to support that it's the ECU, I doubt it. ECU's are generally extremely reliable. It could of course be a bad contact in a connector, take it out, spray with cleaner, and put it back in.

Swapping coils is the cheapest simplest quasi-scientific thing to try. It may show up a problem item, it may not, but costs just a few minutes work.
« Last Edit: April 07, 2022, 11:04:53 AM by embee »

GBH

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #9 on: April 07, 2022, 11:09:50 AM »
I would suggest that the ECU (engine control unit) is probably the least likely thing to go wrong. Sounds like the garage are just employing the "shotgun" diagnostic system, throw something in there and see what it hits, then say it's probably that. Do they actually have any evidence to support that it's the ECU, I doubt it. ECU's are generally extremely reliable. It could of course be a bad contact in a connector, take it out, spray with cleaner, and put it back in.

Swapping coils is the cheapest simplest quasi-scientific thing to try. It may show up a problem item, it may not, but costs just a few minutes work.

I would agree.  Is it an general garage or a Honda specialist?  Experience has taught me that the extra cost of using a specialist (main dealer or, preferably, an independent) is well worth it as they will hone in on the problem quite quickly due their experience on that brand.

Had a BMW indie diagnose a faulty instrument cluster for me and stand his ground when the so-called repair shop argued the cluster was O.K. and the problem was the car's wiring.  He sent it back and told them to try again, and was proved right and saved me considerable costs in the long run.

Regarding ECU problems, these are quite rare and my most recent problem (VW Golf) was due to simply minor corrosion on the connecting pins of the ECU. Using contact cleaner / WD40 and unplugging / plugging back in several times cured the problem of slow acceleration and backfiring, particularly when cold.

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #10 on: April 07, 2022, 11:58:59 AM »
Hiya

thanks for your advice. I'm not using a Honda specialist because of the Limp Mode.
The Honda dealer was too far away to risk driving to.

I've just returned from the local garage dealing with my Jazz and I'm not confident in them.
They don't welcome my polite suggestions and quote £1200.00 for the ECU which I told them I couldn't afford.

I wonder if I should pay them for their work so far and risk driving home 200 miles to Yorkshire or to a Honda specialist. They warned against driving so far on 3 cylinders....

Your views would be very welcome! pensioner joe  :-\

embee

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #11 on: April 07, 2022, 12:31:45 PM »
A friend had a problem with a Merc diesel losing boost. The indi they used for servicing diagnosed a "failed turbo", £1700 exchange. I suggested they go to the Merc dealership, failed hose, £150.
Note the "exchange" trap, the old "failed" part disappears for exchange so you get a new part and a big bill, they get a perfectly serviceable used part worth ££.
A neighbour had a similar thing with one of the breakdown brigade. I had fitted a new battery for her barely 6months earlier. It went flat (something left on), breakdown said a new battery required or they wouldn't come out again, the breakdown get £80 for a £50 battery plus the mechanic gets a perfectly good 6month old battery to flog on. Kerching.

Eurocarparts list a Delphi coil https://www.eurocarparts.com/ignition-coil (check for correct part) listed at £30 with discount. I'd suggest worth getting one as a trial even if it turns out not to be the fault, not a huge cost (better than £1200). Are you able to change it yourself?

Shantijoe

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #12 on: April 07, 2022, 12:37:04 PM »
Hiya

Thanks for your advice. I've asked the garage to swap the coils around and see if the fault is the same.
They seem reluctant as your story indicates- the exchange trap...
 Meanwhile I'll check your link...

Do you think it's safe to try and drive 200 miles home to my trusted mechanic?

Ta, joe

embee

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #13 on: April 07, 2022, 01:40:50 PM »
I'd suggest not ideally, but you could "probably" get away with driving it. Your choice really.
 
The engine management "should" prevent serious damage by inhibiting fuel to a cylinder if there is a misfire detected (any unburnt fuel/air mixture getting through a cylinder will react in the catalyst and will very rapidly overheat/melt it, so it gets switched off to that cylinder), but it generally isn't really a good idea to run it with a persistent misfire even if it has gone into a safe mode.
That was the reason for on-board-diagnostics (OBD) being introduced, so the system could detect when there was a fault which could "potentially" cause serious emissions failure and/or damage, and do something to prevent it. It should be safe to drive if really necessary. Is it a good idea? In theory not really but in practice you can get away with it. 200mls is a bit of a long distance, but if you feel it necessary ...........

Where are you right now and where do you want to get to, if that's not a rude question?

Jocko

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Re: 2012 Jazz suddeny loses power and Yellow light comes on...
« Reply #14 on: April 07, 2022, 04:10:37 PM »
Have you tried resetting the codes with the OBD reader?

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