ZR-1 Net Registry Forums - View Single Post - Needing Help with Throttle Position Switch (TPS) on 1993

VetteMed · 03-15-2012

There's no reason to pierce any wires.

The connector for the TPS can be partially disassembled for adjustment purposes.

1) Unplug the connector from the TPS
2) Using a small flat-bladed screwdriver, flip the cover back from over the end where the wires enter the connector body.
3) Using a small pick or fine flat bladed screwdriver, gently pull back the three rubber grommets that surround the wires as they enter the connector body.
Plug the connector back in to the TPS.

You can now use your standard DVM leads to probe the connector, without piercing any insulation. If I remember correctly, it's the top and middle leads that you need to measure across. I think the bottom one is the 5V reference.

I will go check my diagrams to confirm.

03-15-2012	#4
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,816	Re: Needing help with TP Switch There's no reason to pierce any wires. The connector for the TPS can be partially disassembled for adjustment purposes. 1) Unplug the connector from the TPS 2) Using a small flat-bladed screwdriver, flip the cover back from over the end where the wires enter the connector body. 3) Using a small pick or fine flat bladed screwdriver, gently pull back the three rubber grommets that surround the wires as they enter the connector body. Plug the connector back in to the TPS. You can now use your standard DVM leads to probe the connector, without piercing any insulation. If I remember correctly, it's the top and middle leads that you need to measure across. I think the bottom one is the 5V reference. I will go check my diagrams to confirm. Last edited by ZBrink; 01-26-2025 at 05:12 PM.