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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 C1 (RED)

Pin

Wire Color Circuit No Function
1 YEL 573 CKP Signal
2 BLK/WHT 451 PCM Ground
3 BLK 1744 Inj #1 Control
4 LT BLU/BLK 844 Inj #4 Control
5 YEL/BLK 846 Inj #6 Control
6 RED/BLK 877 Inj #7 Control
7 DK GRN/WHT 465 FP Relay Control (PCM Supplies 12v+)
8 not used
9 GRY 435 EGR Solenoid Control
10 DK BLU 473 Cooling Fan #2 & #3 Relay Control (PCM Supplies GROUND)
11 DK GRN 335 Cooling Fan #1 Relay Control (PCM Supplies GROUND)
12 TAN/BLK 464 EBTCM TP Sensor Signal
13 WHT 121 Engine Speed Output Signal (TACH)
14 BRN 436 AIR Pump Relay Control
15 DK/BLU 1493 Transmission Mode Lamp Control (F-Body ONLY)
16 not used
17 not used
18 TAN/WHT 551 PCM Ground
19 LT GRN/BLK 1745 Inj #2 Control
20 BLK/WHT 845 Inj #5 Control
21 PNK/BLK 1746 Inj #3 Control
22 DK BLU/WHT 878 Inj #8 Control
23 ORN/BLK 463 Traction Control Spark Retard Request
24 not used
25 BLU 229 Fuel Enable Signal
26 not used
27 not used
28 not used
29 not used
30 not used
31 PPL 401 VSS Signal Low
32 YEL 400 VSS Signal High

 

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 C3 (CLEAR)
1 LT BLU/WHT 1747 IAC Coil A High
2 LT BLUE/BLK 1748 IAC Coil A Low
3 TAN 1671 HO2S B2S2 Low 1996+
4 PPL 1670 HO2S B2S2 High 1996+
5 LT GRN/BLK 444 IAC Coil B Low
6 LT GRN/WHT 1749 IAC Coil B High
7 TAN 1667 HO2S B2S1 Low
8 PPL 1666 HO2S B2S1 High
9 not used    
10 not used    
11 LT BLU 832 Traction Control System Active Signal (F-Body ONLY)
12 not used    
13 LT BLU 553 Performance Mode Switch Signal (F-Body ONLY)
14 LT BLU/BLK or PPL 583 or 420 Brake Switch Signal (F-Body) or (B-Body) (12v+ When brakes are NOT pressed. Switch opens circuit, so no voltage to this pin when brakes ARE pressed.
15 ORN/BLK 434 PNP Switch
16 RED/BLK 1228 Transmission Pressure Control Sol
17 TAN/WHT 1669 HO2S B1S2 Low 1996+
18 PPL/WHT 1668 HO2S B1S2 High 1996+
19 TAN/WHT 1653 HO2S B1S1 Low
20 PPL/WHT 1665 HO2S B1S1 High
21 TAN 472 IAT Sensor Signal
22 DK BLU 417 TP Sensor Signal
23 LT GRN 432 MAP Sensor Signal
24 not used    
25 YEL 410 ECT Sensor Signal
26 not used    
27 not used    
28 PNK 1224 Transmission Fluid Pressure Switch Signal A
29 DK BLU 1225 Transmission Fluid Pressure Switch Signal B
30 RED 1226 Transmission Fluid Pressure Switch Signal C
31 not used    
32 BLK/WHT 451 PCM Ground

 

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