How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Mike Your Own Question
Mike, Technician
Category: Mazda
Satisfied Customers: 39198
Experience:  Tech Expert
Type Your Mazda Question Here...
Mike is online now

A couple of times in the last two weeks a recently purchased

This answer was rated:

A couple of times in the last two weeks a recently purchased Mazda 2 1.4 diesel has gone into "limp home" mode and the powertrain fault light has come on. Both time the AA could find no fault code or rather they could get no communication. A local garage was able to plug in but each time the ign went dead, but after wiggling various ecm leads or relays the ign was restored and fault codes were retrieved. Many codes indicated communication lost within the ecm but there was also a #3 injector circuit fault indicated.
I saw on an Autoexpress site that a local dealer said this could be a faulty engine earth connection. On examination I found an earth strap on the drivers side engine mount that was very suspect and had but half the copper strands clamped under a washer held down by a a bolt. I have replaced this connection with a soldered battery terminal. Is this likely to have solved this fault. We are wary of taking it on a motorway which the only place it seems to give up on us. The fault goes when the engine cools down. Any help would be appreciated

I'm Shantal and I'm a moderator for this topic.

We have been working with the Experts to try to help you with your question. Sometimes it may take a bit of time to find the right fit.

I was checking to see if you had already found your answer or if you still need assistance from one of the Experts.

Please let me know if you wish to continue waiting or if you would like for us to close your question?

Thank you,

Hello and Welcome..

My name is XXXXX XXXXX Im happy to help / advise..

Indeed - yes - a bad earth will cause all these troubles...

What I would suggest you do to rule this out / cure this without doubt is to obtain from a car spares shop - a long "main earth" cable ( you can buy them in different lengths).. then fit that - bolt it to the body at a convenient point - even the one that is the original - just be sure the body is clean free of corrosion and paint - so clean bare metal.. then connect the other end to any good contact point on the engine - a bolt / nut head...anything like that - so long as its a good connection. That will do away with this issue altogether..

IF you should have any issue again - then you need to check the actual connections to the various components -such as the main fuse box connections - ( the main feed lead)..and the Ecu - (block connectors ) and so on.. but from what you have said - Im sure you will find its cured with a decent main earth strap.

Let me know how if you need anything else-

Very best Rgds, MIKE.

>>> >> > Meantime...

Please do click on the OK rating to Excellent ratings service for me now at this point , Thank you for that... and you can get back to me anytime if you need / wish..

Best Rgds, MIKE.
Mike, Technician
Category: Mazda
Satisfied Customers: 39198
Experience: Tech Expert
Mike and other Mazda Specialists are ready to help you