NP136 operation

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Topic author
Damnvan
I am merely driving my van
I am merely driving my van
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Joined: Tue Apr 22, 2008 6:09 pm
Location: Knoxville TN

NP136 operation

Post by Damnvan »

Hi

My 1999 AWD has come to an end. The service AWD light is on all the time and i can not get it to reset any more. I don't have the money to spend on much replacment and I really can't even find anyone to check the code for me.

In the mean time I have been wanting to be able to enage the 4wd with a switch. I pulled the heavy duty 2 wire plug off motor on the transfer case and tested and I am not getting any voltage after cycling the key. I am thinking of a way to apply voltage to this motor to make the 4wd lock and then unlock with a switch possibly. If anyone else has any ideas about it chime in. I would also like a nice schematic as well if anyone had one. I got a manual form the library once but there is nothing on the AWD part of the system.

Here is the picture of the plug I am talking about. I am assuming it gets 12 volts by the size of the wires and the plug.

Image

Heres a picture of the motor I am talking about.

Image

I have some ideas from mild to wild on how to make this work based on some work I did on my friends older Ford Explorer.

LiftedAWDAstro
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Re: NP136 operation

Post by LiftedAWDAstro »

From what guys on here have had for problems, the servo motor is the most likely culprit. I would think you could throw 12 volts on the motor plug and see if it engages. sounds like you have nothing to lose.
Current rides:
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2008 Dodge Nitro 4x4
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Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy

1996astro
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Re: NP136 operation

Post by 1996astro »

If you can get it scanned I will post the documentation of what the code is, and diagnostic procedures for you.
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ihatemybike
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Re: NP136 operation

Post by ihatemybike »

head to AutoZone or the like, free scanning. Later, get a ScanGaugeII and be able to scan any time you want.
Aaron

2005 Astro (Gandalf) - AWD, 4.3L, 3.42, 130k+ miles
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potskie
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Re: NP136 operation

Post by potskie »

ihatemybike wrote:head to AutoZone or the like, free scanning. Later, get a ScanGaugeII and be able to scan any time you want.
ScanGuage FTW! I love mine can you tell :D right now while my dash lights are not working I've been using mine as a speedo at night.
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Topic author
Damnvan
I am merely driving my van
I am merely driving my van
Posts: 5
Joined: Tue Apr 22, 2008 6:09 pm
Location: Knoxville TN

Re: NP136 operation

Post by Damnvan »

When I had it scanned at Autozone they did not find a code for it. My local mechanic "could try" for me for 60$ but he says he doesn't think it reads the TCCM. I kow I could goto the dealer but thats adding up the cost already.

So I am thinking the operation is somewhat 2wd until the encoders see slip then the motor engages and its 4wd 50/50 split?

Can you take the motor off with out removing the front driveshaft? I guess since I dont have AWD I can shelve the front shaft anyway.

My only concern is if I put voltage to it I will not able to disenage the transfer case later on. I am not sure how the motor "reverses" it self but I have some ideas after working on a Explorer motor before.

If someone felt real frisky maybe they could report back what readings you get from that plug when the key is powered on if any.

LiftedAWDAstro
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Re: NP136 operation

Post by LiftedAWDAstro »

If I remember correctly, reading the TCCM will need to be done on a high dollar scanner. The local dealer can definitely do it. Autozone can not.
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
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