Neutral Safety/Clutch Pedal Position Switch?
06-12-2008, 01:56 PM
#1
Neutral Safety/Clutch Pedal Position Switch? So one day I will hopefully drive this car and I need to finish up some of the wiring to get closer. One of the last things I have to do is figure out what to do with a neutral safety switch and clutch pedal position switch.
This is a T56 car with no cruise control.
In a normal manual car I would expect it not to turn over without the clutch pedal being depressed. How do I do this with the LS1/T56? Does the PCM listen to the CPP and not start unless it's depressed? Or do I need to wire in a NSS to accomplish this? Any Input?
I'm still kinda confused on this part.
This is a T56 car with no cruise control.
In a normal manual car I would expect it not to turn over without the clutch pedal being depressed. How do I do this with the LS1/T56? Does the PCM listen to the CPP and not start unless it's depressed? Or do I need to wire in a NSS to accomplish this? Any Input?
I'm still kinda confused on this part.
06-12-2008, 06:12 PM
#3
TECH Resident
iTrader: (2)
Join Date: Jun 2006
Location: Roswell, GA
Posts: 802
Likes: 0
Received 0 Likes
on
0 Posts
I don't think there is a neutral switch on T56 cars...
For the clutch switch, that really has nothing to do with the PCM or the LSx swap. That's the big purple wire running from the starter to your ignition switch. Factory auto car would have a park/neutral switch in the middle of it, and factory manual trans car would have the clutch switch in the middle of it. You can either put a factory-style high-current clutch switch in the middle of it, or rig up a microswitch and a relay to the clutch pedal. Or you could not do anything--GM didn't start putting clutch switches in manual trans cars until '68. The Japanese didn't start doing it until the mid 80's.
For the clutch switch, that really has nothing to do with the PCM or the LSx swap. That's the big purple wire running from the starter to your ignition switch. Factory auto car would have a park/neutral switch in the middle of it, and factory manual trans car would have the clutch switch in the middle of it. You can either put a factory-style high-current clutch switch in the middle of it, or rig up a microswitch and a relay to the clutch pedal. Or you could not do anything--GM didn't start putting clutch switches in manual trans cars until '68. The Japanese didn't start doing it until the mid 80's.
06-12-2008, 10:24 PM
#5
TECH Resident
iTrader: (2)
Join Date: Jun 2006
Location: Roswell, GA
Posts: 802
Likes: 0
Received 0 Likes
on
0 Posts
The Z28 clutch position switch is triple pole, single throw. One circuit of the switch grounds PCM C1-32, the next circuit of the switch provides power to the coil of the starter relay (BCM provides ground to the relay), and the last circuit is run in series with a brake pedal switch to provide power to the D terminal of the cruise control module.
If you don't feed a clutch switch to the PCM, it's easier to stall when letting out the clutch smoothly when you're stopped. Haven't found anything else it seems to affect.
If you don't feed a clutch switch to the PCM, it's easier to stall when letting out the clutch smoothly when you're stopped. Haven't found anything else it seems to affect.
