CODE 21: Fuel Tune Select - Defender Source
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Old May 18th, 2013, 11:34 PM
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Chris Davis
94 NAS D90 6.2LS
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CODE 21: Fuel Tune Select

I have a code on my 94 D90, #21 (Fuel Tune Select). Has anyone ever seen that code be displayed before? I did unplug my two silver relays (fuel/ecu) when I serviced my fuel pump recently as I am still troubleshooting my intermittent bucking/misfiring (driving me nuts).

My first thought when I saw this code was it was due to pulling the relays. So I cleared the code and pulled them again, but this code did not come on yet. I will drive around tomorrow and see if it will come back, but what could it possibly be?

The definition is: Identifies that the tune select resistor is open circuit- refer to tune select resistor test. The tune resistor is embedded in the wire harness. This code may indicate damage to the wire harness.

But all my research on the NAS 90's is that there is NO tune resistor (particularly from this article and others research http://www.britishv8.org/articles/rover-14cux-efi.htm )

Anyone see this code before? I hope my harness is not damaged--as it is intermittent, this will be a bugger to find, to say the least...
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  #2  
Old May 19th, 2013, 10:48 AM
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Doug Gorshe
97 Disco
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My apology, I was cruising through the forum (in the market for a D90/SIIa/EXMOD and reading up about common issues) and this has been something of interest to me for a long time. I found some information about it on an old forum I used to post to and thought I'd post it up. http://www.landroversonly.com/forums...esistor-31283/

Hope it helps......
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Old May 20th, 2013, 12:17 PM
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Chris Davis
94 NAS D90 6.2LS
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I have confirmed that there is a tune resistor, as I found and unwrapped it in my harness, about 6" from the ECU plug in the harness wrapped in an orange translucent shrink tube. It looks fine, but I am going to drop down to my electronics store and pick up another one and solder it in. 3900 ohms, .5W 5% resistor, FYI, and it is connected by a grey w/black stripe wire on one end and a grey on the other.

There is another resistor connected on an orange and orange/black wire that is also wrapped there--I believe the wires are for the Transmission Gear Switch Signal, although I don't know what the purpose of that resistor is.
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Old May 20th, 2013, 12:20 PM
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Jason England
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Quote:
Originally Posted by Davis View Post
I have confirmed that there is a tune resistor, as I found and unwrapped it in my harness, about 6" from the ECU plug in the harness wrapped in an orange translucent shrink tube. It looks fine, but I am going to drop down to my electronics store and pick up another one and solder it in. 3900 ohms, .5W 5% resistor, FYI, and it is connected by a grey w/black stripe wire on one end and a grey on the other.

There is another resistor connected on an orange and orange/black wire that is also wrapped there--I believe the wires are for the Transmission Gear Switch Signal, although I don't know what the purpose of that resistor is.
My guess is it's a current limiting resistor as the gearbox switch goes back to the ECU ...
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