Manual to Auto conversion NAS 110 - Defender Source
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  #1  
Old November 13th, 2013, 10:12 AM
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Tyler
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Manual to Auto conversion NAS 110

I've got an NAS 110 that has already had a manual to Auto conversion performed. The problem I'm having is an uneven idle (RPMs drop, come up, drop, come up). My understanding is that the ECU needs to be told the vehicle has an auto gearbox. Any tips on how this procedure can be performed.

Thanks
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  #2  
Old November 13th, 2013, 10:27 AM
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Russell
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Have you tried replacing the stepper motor yet?
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Old November 13th, 2013, 10:44 AM
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Tyler
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Quote:
Originally Posted by down_shift View Post
Have you tried replacing the stepper motor yet?
Already done. Along with plugs, cap, rotor, coil, set ignition timing, idle speed, replace fuel pressure regulator (fuel pressure bleeding off), and fuel filter. Problem seems less pronounced if idle speed is raised. However, not crazy about just raising idle speed to mask a problem.
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Old November 13th, 2013, 11:29 AM
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Andrew Najarian
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There is info on ECR's website about it, I actually just stumbled upon it the other day while looking for something else. Essentially I think you just need to connect it to a computer and tell it that it has an Auto.
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Old November 13th, 2013, 11:35 AM
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ECR had a post explaining how to fix it if you search. Basically you have to add a wire.
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Old November 13th, 2013, 11:50 AM
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Andrew Najarian
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Quote:
Originally Posted by evilfij View Post
ECR had a post explaining how to fix it if you search. Basically you have to add a wire.
Ron may be right, but I think the wire is for adding A/C so the ECU knows when the Compressor kicks on and steps up the idle.

IIRC, the Auto Conversion just entails a computer software change.
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Old November 13th, 2013, 12:49 PM
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Robert Dassler
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14CUX ECUs will work with either an automatic or a standard transmission. On a standard transmission equipped truck, ECU pin 34 (Orange/Black) is permanently grounded through a 480 ohm resistor. The same pin on an automatic is wired to the P/N position switch of the automatic transmission which grounds the wire in park or neutral and has no continuity (open circuit) in gear. Disconnect your ECU connector, Ohm check pin 34 to ground and move the shifter through all the gears. You should have zero (or close) ohms to ground in park & neutral and infinite ohms in gear. If you read 480 ohms in park & neutral, then the ECU is wired to the switch correctly but the resistor is still in place. If that is the case, remove the resistor. It will probably be taped into the harnass. May be easier to run a new wire than split the harnass to find it. If Pin 34 has 480 ohms to ground all the time, it isn't wired to the switch and should be. In that case, remove the resistor and wire the switch. See the attached schematic below. It's for a D1 but works for the Defender as well.
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Old November 22nd, 2013, 11:23 AM
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Tyler
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Quote:
Originally Posted by Roadsiderob View Post
14CUX ECUs will work with either an automatic or a standard transmission. On a standard transmission equipped truck, ECU pin 34 (Orange/Black) is permanently grounded through a 480 ohm resistor. The same pin on an automatic is wired to the P/N position switch of the automatic transmission which grounds the wire in park or neutral and has no continuity (open circuit) in gear. Disconnect your ECU connector, Ohm check pin 34 to ground and move the shifter through all the gears. You should have zero (or close) ohms to ground in park & neutral and infinite ohms in gear. If you read 480 ohms in park & neutral, then the ECU is wired to the switch correctly but the resistor is still in place. If that is the case, remove the resistor. It will probably be taped into the harnass. May be easier to run a new wire than split the harnass to find it. If Pin 34 has 480 ohms to ground all the time, it isn't wired to the switch and should be. In that case, remove the resistor and wire the switch. See the attached schematic below. It's for a D1 but works for the Defender as well.
This is just what I needed. Now, my truck knows it's an automatic. Unfortunately, it didn't resolve my rough/surging idle. More testing revealed the throttle position sensor to be faulty. Replaced and idle speed is where it should be and rock steady. Thanks to all that replied.
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