Doing CAGS the Right Way

by John Rovner JOHN_ROVNER@NOVELL.COM

All of the below was obtained from the '94 Corvette service manual BOOK 2.
Use section 8a for all of this info.
Use page 8a-20-7 for PCM.
Use page 8a-22-3 for ECM models

Terms I am using :

Vin P - Base model
Vin J - LT-5 optioned
ECM - Pre '93 Vin P or all LT-5 ZR-1's
PCM - '94 and newer Vin P

ECM/PCM connector block colors:

Connector Block	ECM connector color	PCM connector color
A	Gray	Red
B	Red	Black
C	Green	Clear
D	Brown	Blue

Most people who disable CAGS crawl under the car and pull the plug where it goes into the transmission. There is a better way that also disables the shift light. Simply disconnect two pins/wires from your ECM/PCM. You can get a pin extraction tool for a couple of bucks at any place like Radio Shack. Tape off the ends or maybe use some shrink tubing.

For all ECM users,

pull DRK BLUE [ CIRCUIT 1493 ] wire from block B, pin 19 to disable CAGS
pull WHITE [ CIR 375/776 ] wire from block D, pin 6 to disable the shift indicator

For PCM users,

pull GRAY [ CIRCUIT 324 ] wire from block B, pin 13 to disable CAGS
pull WHITE [ CIR # 375 ] wire from block D, pin 15 to disable the shift indicator

It would be quite simple to use a single throw, double pole switch, if you wanted to toggle these functions on or off.

John Rovner
Novell BIS NCS Testlab