Ok, did some more research, and I printed out the circuit descriptions and diagrams at work to share with you all. I wrote a simple diagram for the switch. There is one for 96-00 and one for 01-05.
Enjoy!
Intalled NP231C 4LO Range switch wiring
Re: Intalled NP231C 4LO Range switch wiring
Brandon
Bay City, MI
1997 Astro LT 4x4 48,000 Miles,
Custom Lift: 3" body spacers, torsion keys,
4" leaf spring relocation mounts (by ME),
added a leaf spring from a 94 S10 blazer.
All this gives me 5-6 inches of lift.
General Grabber AT2 31X10.50R15
Custom fit Brush guard
Western 7' 6" plow pictures coming soon...
1997 Buick Century 198,000 miles
Bay City, MI
1997 Astro LT 4x4 48,000 Miles,
Custom Lift: 3" body spacers, torsion keys,
4" leaf spring relocation mounts (by ME),
added a leaf spring from a 94 S10 blazer.
All this gives me 5-6 inches of lift.
General Grabber AT2 31X10.50R15
Custom fit Brush guard
Western 7' 6" plow pictures coming soon...
1997 Buick Century 198,000 miles
Re: Intalled NP231C 4LO Range switch wiring
Good stuff...
Congradulations, and thanks for the info Brandon
Congradulations, and thanks for the info Brandon
1999 LS AWD 3" Lift,4.10's,Snowplow,9500lb Ramsey winch
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- I sleep in my van
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- Joined: Wed May 18, 2011 4:38 pm
- Location: 7000' in the Mountains of California
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Re: Intalled NP231C 4LO Range switch wiring
This works w/o a TCCM right? Can anyone point me to connector 4, terminal 23 of the PCM on my '98???
Great info, thanks
Great info, thanks
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
-
- I sleep in my van
- Posts: 592
- Joined: Wed May 18, 2011 4:38 pm
- Location: 7000' in the Mountains of California
- Been thanked: 3 times
Re: Intalled NP231C 4LO Range switch wiring
ok, this helps
"ECU, ECM, PCM, VCM ... all abbreviations for the same thing.".
"ECU, ECM, PCM, VCM ... all abbreviations for the same thing.".
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
-
- I have my van tatooed on my cheeks
- Posts: 4379
- Joined: Sat Sep 09, 2006 3:35 pm
- Location: New Haven, NY
Re: Intalled NP231C 4LO Range switch wiring
The PCM is mounted right beside the battery. Not sure which connector is C4 and yes it will work without a TCCM since your 98 doesn't have one.
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
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
-
- I sleep in my van
- Posts: 592
- Joined: Wed May 18, 2011 4:38 pm
- Location: 7000' in the Mountains of California
- Been thanked: 3 times
Re: Intalled NP231C 4LO Range switch wiring
Thanks. I was looking for a PCU all thru the manual to no avail, ECU on the other hand.... . I should be able to wire it directly to the low range terminals on the tc selector switch.
This seems like a HUGE improvement, glad to have stumbled upon it.
This seems like a HUGE improvement, glad to have stumbled upon it.
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
-
- I get chills without my van.
- Posts: 56
- Joined: Thu Feb 25, 2010 12:54 pm
- Location: salt lake city UT
Re: Intalled NP231C 4LO Range switch wiring
keep us posted photo_van i would like to see how this turns out... w/pics of course
99 astro awd ls package, 3" bodylift, alarm system w/remote start, tinted windows, tranny cooler, modded air intake, bigger power steering cooler, hood struts, westin pushbar, hypertech tuned running on 91 octane, Hypertech 160* thermostat, 1 ton calipers and pads (not much of a difference as i expected)30" tall tires 245-65-17 on jeep wheels
here is a link to my pics: http://s795.photobucket.com/home/unrreal/allalbums
here is a link to my pics: http://s795.photobucket.com/home/unrreal/allalbums
-
- I sleep in my van
- Posts: 592
- Joined: Wed May 18, 2011 4:38 pm
- Location: 7000' in the Mountains of California
- Been thanked: 3 times
Re: Intalled NP231C 4LO Range switch wiring
Will do. I've got the NP 242C built and waiting in the shed (and pics in the computer). Just need the van to quit breaking so I have time to install!
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
-
- I sleep in my van
- Posts: 592
- Joined: Wed May 18, 2011 4:38 pm
- Location: 7000' in the Mountains of California
- Been thanked: 3 times
Re: Intalled NP231C 4LO Range switch wiring
Conector 4 is the BLACK one on the VCM according to the manual.
Here's the end view Terminal 23 should be unused
Here's the end view Terminal 23 should be unused
1998 AWD/4WD
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710
4" lift, 31x10.50's, NP 242j/c hybrid, 4.10 gears, S10 front disconnect, rack & pinion steering, trans cooler, rock sliders, ARB fridge, house battery and 100w solar, swing out rear rack with foldout camp table, bed and passenger swivel chair
dirt bag camping rig
1981 Toyota 4x4 pu
1974 John Deere 710