[webcat]

What is the (P,3,2,1 ) circuit for?
OK , i know its telling somthing what gear it is in (P,3,2,1 ) but what is it telling its position to and why ?

 

[z_alfawadleh]

It tells the position of your gear lever for many reasons that affects bot the engine and transmission, and yes it affect the idle speed control, as when you shift in D or R it tells the engine to boost idle to compensate for the additional load coming to the engine.

 

[webcat]

I cant find anything tieing in the nuetral safety switch (D,3,2,1) switch to the PCM , I have a complete schematic , i was wondering if 1995 models just used this switch as a indicator and did nothing to control the engine performance ?

 

[z_alfawadleh]

What will I get for proving that this sensor switch is there doing that?

 

[webcat]

I talked to the guy at fuel injection connection and he said on the 1993 , 94 ,95 models this switch is'nt needed to drive the car and also without it everything will work normal (gear shifting and idle etc.)

 

[astro355]

Well, that's interesting to know. The next time I work on one of those years, I'll have to try that.

 

[rev_les]

Having a '95 as well, I'd like to know this too. As I understand it, even the early '95's are OBD 1.5, which is OBD 1, plus trans. control. Correct me if I'm mistaken. I do know there's no kickdown cable on mine, and no CKPS, and has the old style aldl.I'd think it was all computer controlled, there's only a harness connecting the trans. to the rest of the system.

 

[webcat]

I dont think the 93 -95 4L60E trucks even have this switch on the transmission ?

 

[gtkane]

I dont think the 93 -95 4L60E trucks even have this switch on the transmission ?

All 4L60E trans have this switch. If it doesn't, then it's a 4L60(700R4) with no "E".

 

[ShiftRite]

93-94 4L60E Transmissions do not have the netural Saftey switch, 95 and up does have them, FYI

[email protected]

 

[webcat]

Yes thanks , thanks much!!!!

 

[astro355]

You know, I suppose you could unplug it and see what happens. Its not like your van would explode or something.

 

[webcat]

You know, I suppose you could unplug it and see what happens. Its not like your van would explode or something.

Yep , if i had a 1995 van !
What i'm doing is trying to convert my 1996 G10 van to a 1995 G10 van mechanicle wise ( i'm putting a TBi Vortec intake i bought from ebay , 1995 PCM and wiring harness into my 1996)

 

[astro355]

Somewhere on here is a thread talking about this. There was mention of the valve body in the 95 being different than the 96 and they would need to be changed, along with other parts. I'll try and locate it.

The 95 Valve Body has a different 3-2 Downshift valve line up, 3-2 Downshift Solenoid, and Seperator Plate, compared to the 96-UP. The last three on the VB casting is 393 (93-95), and for 96 97 98 it is 537 and some others, Best way is to interchange the 96 to work for a 95 would be, Use the 95 Valve body, harness, Seperator plate, 3-2 Solenoid, on the 96 Transmisson, or vise versa. I always reccomend new accumulator pistions, sonnax TCC Regulator Valve, and TransGO Seperator Plates, since the one checkball wears the plate badly after about 100 K or so. They have 3 types available to replace all 4L60E plates, 93-94, 95, 96-UP. Hope that helps,

Brett
[email protected]

 

[webcat]

yeh , i saw that , i posted on there too!
That was a really good thread , i had to make a shortcut to that one!!! :goodpost: