Home ECU Pinouts LS1 ECU Pinout – 1999-2002

LS1 ECU Pinout – 1999-2002

September 15, 2014

Rounding out our LS1 engine guide is our LS1 ECU pinout article for year ranges between 1999-2002 F-body vehicles. This ECU pinout is accurate for 99-02 LS1 engines with cable actuated throttle bodies, and is not accurate for the Chevy Corvette.

Let’s start with the BLUE connector found on your LS1 Powertrain Control Module (PCM) and work our way through all the ECU pinouts.

Make sure to check out our related LS1 articles below as well.

PCM connector (BLUE)

Pin – Wire Color – Circuit

1 BLK 451 PCM Ground
2 LT GRN 1867 12 Volt Reference- CKP Pin “C”
3 PNK/BLK 1746 Fuel Injector 3 Control
4 LT GRN/BLK 1745 Fuel Injector 2 Control
5-7 — — Not Used
8 GRA 596 5 Volt Reference TPS Pin “A”
9-10 — — Not Used
11 LT BLU 1876 KS [2] Signal Rear Sensor Pin “B”
12 DK BLU/WHT 1869 CKP Sensor Signal Pin “A”
13-16 — — Not Used
17 DK BLU 1225 Transmission Fluid Pressure Switch Signal B Pin “R”
18 RED 1226 Transmission Fluid Pressure Switch Signal C Pin “P”
19 PNK 439 Ignition 1 Voltage20 ORN 340 Battery Positive Voltage
21 YEL/BLK 1868 Low Reference CKP Pin “B”
22 — — Not Used
23 GRA 720 Low Reference Fuel Level Sensor (Factory)
24 — — Not Used
25 TAN 1671 HO2S Low Signal [Bank 2 Sensor 2]
26 TAN 1667 HO2S Low Signal [Bank 2 Sensor 1]
27 — — Not Used
28 TAN/WHT 1669 HO2S Low Signal [Bank 1 Sensor 2]
29 TAN/WHT 1653 HO2S Low Signal [Bank 1 Sensor 1]
30-31 — — Not Used
32 GRA 48 CPP Switch Signal (Manual Trans.)
33 PPL 420 TCC Brake Switch Signal (Auto. Trans)
34 ORN/BLK 434 Neutral Safety Switch Signal
35 — — Not Used
36 BLK 1744 Fuel Injector 1 Control
37 YEL/BLK 846 Fuel Injector 6 Control
38-39 — — Not Used
40 BLK 451 Ground
41 — — Not Used
42 DK GRN 335 Low Speed Cooling Fan Relay Control (Primary fan)
43 RED/BLK 877 Fuel Injector 7 Control
44 LT BLU/BLK 844 Fuel Injector 4 Control
45 GRA 474 5 Volt Reference (A/C Refrigerant Pressure Sensor) (Factory)
46 GRA 474 5 Volt Reference (Fuel Tank Pressure Sensor) (Factory)
47 — — Not Used
48 GRA 416 5 Volt Reference (MAP Sensor) Pin “C”
49-50 — — Not Used
51 DK BLU 496 KS [1] Signal Front sensor Pin “A”
52 — — Not Used
53 BLK 407 Low Reference (Transmission Temperature Sensor) Pin “M”
54 BLK 407 Low Reference (MAP Sensor Ground) Pin “A”
55 — — Not Used
56 — — Not Used57 ORN 340 Battery Positive Voltage
58 DK GRN 1049 ECM/PCM/VCM Class 2 Serial Data
59 — — Not Used
60 BLK 452 Low Reference TPS Pin “B”
61 PNK/BLK 632 Low Reference (Camshaft Position Sensor) Pin “B”
62-64 — — Not Used
65 PPL 1670 HO2S High Signal [Bank 2 Sensor 2]
66 PPL 1666 HO2S High Signal [Bank 2 Sensor 1]
67 — — Not Used
68 PPL/WHT 1668 HO2S High Signal [Bank 1 Sensor 2]
69 PPL/WHT 1665 HO2S High Signal [Bank 1 Sensor 1]
70 BRN 1174 Oil Level Switch Signal
71-72 — — Not Used
73 BRN/WHT 633 CMP Sensor Signal Pin “A”
74 YEL 410 ECT Sensor Signal Pin “B”
75 — — Not Used
76 BLK/WHT 845 Fuel Injector 5 Control
77 DK BLU/WHT 878 Fuel Injector 8 Control
78 — — Not Used
79 GRA or WHT 587 or 687 Skip Shift Solenoid Control (M/T) or 3-2 Shift Solenoid Control (A/T) Pin “S”
80 BLK 407 Low Reference ECT Pin “A”