1998 LS1 Factory PCM Pinouts

 

This is a list from the GM service manual of all of the wires / pins on the 98 LS1 PCM.

 

PCM Connector C1 (RED) 80 Pin Connector

 

Pin / Wire color / Circuit No. / Function

1-2 - - Not used

3 WHT 1310 EVAP Canister Vent Solenoid Valve Control

4 BRN/WHT 633 Camshaft position Sensor signal

5-6 - - Not used

7 YEL 400 VSS Signal High

8 - - Not used

9 PNK/BLK 1746 Injector #3 control

10 - - Not used

11 DK BLU 229 VTD Fuel Engine

12 LT BLU/BLK 844 Injector #4 Control

13 RED/WHT 2122 Injector #2 Control

14 DK GRN 59 A/C Status

15 BLK/WHT 845 Injector #5 Control

16-17 - - Not used

18 YEL/BLK 846 Injector #6 Control

19-20 - - Not used

21 PPL 719 IAT Sensor Ground

22 DK BLU 1225 Transmission Range Signal B

23 LT GRN/BLK 1745 Injector #2 Control

24 BLK/WHT 1704 Sensor Ground Jumper

25 PNK 1224 Transmission Range Signal A

26 - - Not used

27 RED/BLK 877 Injector #7 Control

28-29 - - Not used

30 GRY/BLK 1687 Spark Retard Signal

31 DK BLU/WHT 878 Injector #8 Signal

32 ORN/BLK 434 PNP Switch Signal

33 BLK 1744 Injector #1 signal

34 GRY or WHT 587 or 687 Skip Shift Solenoid (M/T) or 3-2 Shift Solenoid (A/T)

35 LT GRN 1222 1-2 Shift solenoid

36 DK/BLU 1936 Fuel Gauge Output Control

37 BRN/WHT 419 MIL Control

38 - - Not used

39 DK GRN/WHT 459 A/C Clutch Relay Control

40 WHT or YEL/BLK 375 or 1223 Skip Shift Lamp Control (M/T) or 2-3 Shift Solenoid (A/T)

41 BRN/WHT 1173 Low Oil Level Indicator Lamp Control

42 LT GRN 1652 Reverse Inhibit Solenoid Control

43 DK/GRN 335 Cooling Fan Relay #1 Control

44 YEL 573 Crankshaft Position Sensor signal Input

45 DK GRN/WHT 428 EVAP Canister Purge Valve Control

46 - - Not used

47 DK GRN/WHT 762 A/C Request signal

48 YEL 492 MAF Signal

49 PPL 2121 Ignition #1 Control

50-51 - - Not used

52 PPL/WHT 2128 Ignition #8 Control

53 RED 2127 Ignition #7 Control

54 LT BLU/WHT 2126 Ignition #6 Control

55 DK GRN/WHT 817 VSS Output Signal

56 DK GRN 2125 Ignition #5 Control

57 DK GRN/WHT 2124 Ignition #4 Control

58 LT BLU 2123 Ignition #3 Control

59 BRN/WHT 2130 Ignition Control Reference Low Bank 2

60 BRN 2129 Ignition Control Reference Low Bank 1

61 RED 1226 Transmission Range Signal C

62 BLK 552 EGR Pintle Position Ground

63 BLK 407 A/C Refrigerant Pressure Sensor Ground

64-70 - - Not used

71 PPL 401 VSS Signal Low

72 BLK 451 PCM Ground

73-74 - - Not used

75 GRY 720 Left and Right Fuel Tank Level Sensor Ground

76 BLK 451 PCM Ground

77 PPL 420 TCC/Brake Switch Signal

78-80 - - Not used

 

PCM Connector C2 (BLUE) 80 Pin Connector                                                                                                                                 ^

 

Pin / Wire color / Circuit No. / Function

1 TAN 1671 HO2S Signal Low Bank 2 Sensor 2

2 TAN/WHT 1669 HO2S Signal Low Bank 1 Sensor 2

3 TAN 800 Serial Data (UART)

4 RED 631 Camshaft Position Sensor B+ Supply

5 TAN 1667 HO2S Signal Low Bank 2 Sensor 1

6 TANWHT 1653 HO2S Signal Low Bank 2 Sensor 1

7 RED/BLK 380 A/C Refrigerant Pressure Sensor Signal

8 TAN 472 IAT Sensor Signal

9 BRN 1456 EGR Pintle Position Sensor signal

10 PPL 30 Fuel level Sensor Signal

11 - - Not Used

12 DK BLU 417 TP Sensor Signal

13 YEL/BLK 1227 Transmission Fuid Temperature Sensor Signal

14 ORN/BLK 1057 Transmission Fluid Temperature Sensor Ground

15-18 - - Not Used

19 PNK 439 PCM Ignition 1 Feed

20 ORN 340 PCM Battery Feed

21 BLK 451 PCM Ground

22 YEL/BLK 1868 Crankshaft Position Sensor Ground

23 BLK 452 TP Sensor Ground

24 BLK/WHT 1704 Sensor ground Jumper

25 BRN 718 ECT Sensor Ground

26 ORN/BLK 469 MAP Sensor Ground

27 - - Not Used

28 DK BLU 473 Engine Cooling Fan Relay #2 and #3 Control

29 - - Not Used

30 BRN 436 AIR Pump Relay Control

31 TAN/BLK 421 AIR Solenoid relay Control

32 BRN 422 TCC Enable Solenoid

33 BRN 418 TCC (PWM) Solenoid Valve Ground

34 GRY 435 EGR Valve Ground

35 WHT 121 Engine Speed (Tach) Output signal

36 LT BLU/WHT 1229 Transmission Fluid Pressure Control Solenoid Control Low

37 DK GRN/WHT 465 Fuel Pump Relay Control

38 LT BLU 697 EGR Valve Control Circuit

39 RED/BLK 1228 Transmission Fluid Pressure Control Solenoid Control High

40 - - Not Used

41 PPL 1670 HO2S Signal High Bank 2 Sensor 2

42 PPL/WHT 1668 HO2S Signal High Bank 1 Sensor 2

43 GRY 596 TP Sensor 5V Reference

44-45 - - Not Used

46 PPL 1666 HO2S Signal High Bank 2 Sensor 1

47 PPL/WHT 1665 HO2S Signal High Bank 1 Sensor 1

48 LT GRN 432 MAP Sensor Signal

49 YEL 410 ECT Sensor Signal

50-51 - - Not Used

52 DK GRN 890 Fuel Tank Pressure Sensor Signal

53 - - Not Used

54 LT GRN/BLK 444 IAC Coil B Low

55 LT BLU/BLK 1748 IAC Coil A Low

56 LT BLU/WHT 1747 IAC Coil B High

57 LT GRN/WHT 1749 IAC Coil A High

58 PPL 1807 Serial data (Class 2)

59 - - Not Used

60 BLK 451 PCM Ground

61 ORN 340 PCM Battery Ground

62 LT GRN 1867 Crankshaft Position Sensor B+ Supply

63 - - Not Used

64 GRY 416 MAP Sensor 5.0Volt Reference

65 GRY 705 5V Reference

66 GRY 474 A/C Refrigerant Pressure Sensor 5.0 Volt Reference

67 GRY 598 5V Reference

68 LT BLU 1876 Knock Sensor (KS) Rear

69 DK BLU 496 Knock Sensor (KS) Front

70 PNK BLK 632 Camshaft Position Sensor Ground

71-75 - - Not Used

76 BRN 1174 Oil Level Sensor Signal

77-80 - - Not Used