The following PCM Pinouts will cover all LT1, 1994 to 1997. There are
notes in the Functions column that may say this was only in a F-Body, or B-Body,
etc. Also all 1996+ OBD2 pins are listed, of course, if you have a 1994 or
1995 those pins will be empty. If you get to a pin that my chart shows a
wire, and you don't have one in your harness, its very likely you don't need it
for stand alone conversion. Also keep in mind that this is for the basic
engine/trans. This will remove air conditioning controls, emission controls,
etc. Wires
to keep for EXTERNAL CONNECTIONS are BLUE and
wires to remove are YELLOW.
WIRES THAT ARE NOT HIGHLIGHTED REMAIN UN TOUCHED.
THEY WILL GO DIRECTLY FROM PCM TO A PLUG, (SENSOR, SWITCH, DEVICE ETC.)
| PCM Connector C2 (BLACK) |
| Pin |
Wire Color |
Circuit No |
Function |
| 1 |
DK GRN/WHT F-Body (BLUE B-Body) |
762 |
A/C Request Signal |
| 2 |
RED/BLK |
453 |
Low Resolution Signal |
| 3 |
PNK/BLK |
632 |
Distributor Reference Low Signal |
| 4 |
not used |
|
|
| 5 |
WHT |
423 |
Ignition Control |
| 6 |
BLK |
470 |
Sensor Ground |
| 7 |
LT GRN |
1222 |
Transmission 1-2 Shift Sol Control |
| 8 |
DK GRN/WHT |
817 |
VSS Output (4000 Pulse/Mile) |
| 9 |
not used |
|
|
| 10 |
not used |
|
|
| 11 |
BRN/WHT |
1173 |
Low Oil Lamp Control (B-Body ONLY) |
| 12 |
YEL/BLK |
1223 |
Transmission 2-3 Shift Sol Control |
| 13 |
WHT or GRY |
687 or 587 |
Transmisison 3-2 Shift Sol Control AUTO or Skip Shift
Sol Control MANUAL |
| 14 |
RED |
631 |
Distributor Ignition Feed |
| 15 |
ORN |
340 |
PCM Battery Positive Voltage |
| 16 |
BLK |
452 |
Sensor Ground |
| 17 |
not used |
|
|
| 18 |
PNK/BLK |
|
1994 B-Body ONLY - NOT NEEDED |
| 19 |
YEL |
492 |
MAF Sensor Signal |
| 20 |
PPL/WHT |
430 |
High Resolution Signal |
| 21 |
DK GRN |
59 |
A/C Clutch Status |
| 22 |
TAN/WHT |
585 |
TCC Fluid Temp Switch Signal (5.7L B-Body ONLY) |
| 23 |
PPL |
1986 |
EVAP Vacuum Switch Signal (OBD2 ONLY) |
| 24 |
not used |
|
|
| 25 |
not used |
|
|
| 26 |
ORN/BLK |
495 |
Power Steering Pressure Switch Signal (B-Body ONLY) |
| 27 |
BRN |
1174 |
Engine Oil Level Sensor Signal (B-Body ONLY) |
| 28 |
GRY |
474 |
5 Volt Reference |
| 29 |
GRY |
416 |
5 Volt Reference |
| 30 |
PNK |
439 |
PCM Ignition Positive Voltage |
| 31 |
ORN |
340 |
PCM Battery Positive Voltage |
| 32 |
not used |
|
|
| PCM Connector C4 (BLUE) |
| 1 |
TAN/WHT |
551 |
PCM Ground |
| 2 |
LT BLU/WHT |
1229 |
Transmission Pressure Control Sol Low |
| 3 |
PNK |
439 |
PCM Ignition Postive Voltage |
| 4 |
not used |
|
|
| 5 |
not used |
|
|
| 6 |
BRN or LT GRN |
418 or 1652 |
Transmission TCC PWM Sol Control (AUTO 1995+) or
Reverse Inhibit Sol Control (Manual) |
| 7 |
PPL |
1807 |
Serial Data (Class 2) 1996+ (OBD2 Port Pin 2) |
| 8 |
DK GRN/WHT |
459 |
A/C Clutch Relay Control |
| 9 |
BRN/WHT |
419 |
MIL Control (PCM Supplies GROUND for light) |
| 10 |
DK GRN/WHT |
428 |
EVAP Canister Purge Sol Control |
| 11 |
TAN/BLK |
422 |
Transmission TCC Sol Control |
| 12 |
RED/BLK |
380 |
A/C Refrigerant Pressure Sensor Signal |
| 13 |
not used |
|
|
| 14 |
not used |
|
|
| 15 |
WHT |
375 |
Skip Shift Lamp Control (Manual) |
| 16 |
PNK |
1439 |
Change Oil Lamp Control (B-Body ONLY) |
| 17 |
not used |
|
|
| 18 |
not used |
|
|
| 19 |
not used |
|
|
| 20 |
WHT/BLK |
448 |
Output/Field Service Enable (Diag Port) |
| 21 |
LT BLU |
1876 |
Knock Sensor Signal Left (1996+ B-Body ONLY) |
| 22 |
DK BLU |
496 |
Knock Sensor Signal F-Body, 1994-95 B-Body (1996+ Right B-Body) |
| 23 |
not used |
|
|
| 24 |
DK BLU |
732 |
A/C Evaporator Temp Sensor Signal (F-Body ONLY) |
| 25 |
not used |
|
|
| 26 |
DK GRN/WHT |
357 |
Engine Oil Temp Sensor Signal (Corvette) |
| 27 |
not used |
|
|
| 28 |
YEL/BLK |
1227 |
Transmission Fluid Temp Sensor Signal |
| 29 |
TAN |
800 |
Serial Data (UART) (Some B-Body) (Diag Port) |
| 30 |
TAN |
800 |
Serial Data (UART) (Most F-Body & B-Body) (Diag Port) |
| 31 |
not used |
|
|
| 32 |
not used |
|
|