Check engine light and code P1176 - Defender Source
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  #1  
Old September 29th, 2005, 09:24 PM
wingnut
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Scott Launer
97 D-90 SW
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Check engine light and code P1176

I have a 97 SW that is getting a P1176 error code fairly frequently. The check engine light comes on and then will go out after a few days. In another day or two the check engine light comes back on with P1176. Every now and then it idles a bit rough. Other times it hesitates a bit at 2500-3000 RPM. 91K miles on the clock.

A Google search yields this ---> Maximum Positive FMFR Correction Fault.

Anyone have an idea what the bloody hell that means and what may be causing this code?

Thanks!
Scott
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  #2  
Old September 29th, 2005, 09:36 PM
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Robert Dassler
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FMFR is Fuel Mass Flow Rate...it means that the ECU cannot correct the fuelling to it's liking within it's allowable parameters. Based on my experience, I would check the basics like fuel pressure and air filter, and the connection at the airflow meter. I would look at the airflow meter connector...it should have gold pins. Some of them were mismanufactured and corrected under warranty with a replacement sub harnass. I would trace the airflow meter wiring back and make sure that if the sub harnass was installed that the wire joints are ok...i.e. not put together with crappy butt connectors. You may ultimately find that the MAFS is sending a faulty signal and tripping the light. You can test by substitution if you have a friend with a similar vehicle...swap the MAFS and see if the problem follows the part.
Rob
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  #3  
Old September 30th, 2005, 11:26 AM
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Keith Kreutzer
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Scott
Mind you that "similar Vehicle" could be a Disco 1 '96-99 For your '97 90 Or a GEMS RR.

This brings up something that's been bugging me.
Maximum Postive correction fault? Not enough fuel?
Maximum Negative corrction fault? Too much fuel?
Or vice versa?
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  #4  
Old September 30th, 2005, 11:41 AM
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Scott- I used to get this on my 1998 D1. I cleaned the MAFS (with electrical contact cleaner), cleared the code and it never re-appeared. I have also been told it can be due to faulty 02 sensors, most likely the ones Upstream the Cats. Hope that helps.
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Old October 3rd, 2005, 08:31 PM
wingnut
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Scott Launer
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cool. Thanks for the tips. I'll give those things a once over see if it helps.
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Old October 7th, 2005, 07:41 PM
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Scott Launer
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Thumbs up

Well...the light has been out for a couple days now. I basically pulled all of the intake plumbing out and cleaned it all up really well...including the MAF sensor. What I think fixed it was the connection of the updated wiring harness to the MAFS. After removing (seemingly)a mile of electrical tape, i got to the butt connectors. The one for the scrawny little blue wire pulled apart while removing the tape. I removed all three butt connectors, soldered the harness together, and covered it with heat shrink and a mile of electrical tape.

Its idling smooth again and no hesitation between 2500 and 3000 RPM. Time will tell if the P1176 gremlin is gone for good...

Thanks again for the tips!

Scott
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