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”
PCM CONNECTOR (RED)
Pin – Wire Color – Circuit
- 1 BLK 451 Ground
- 2 BRN 418 TCC Solenoid – Output – PWM Pin “U”
- 3 — — Not Used
- 4 PNK/BLK 429 Air Injection Reaction Solenoid Relay – Coil – Control
- 5 — — Not Used
- 6 RED/BLK 1228 PC Solenoid Valve High Control (Sol.A) Pin “C”
- 7 — — Not Used
- 8 LT BLU/WHT 1229 PC Solenoid Valve Low Control (Sol.A) Pin “D”
- 9 DK GRN/WHT 465 Fuel Pump Relay Control [Primary]
- 10 WHT 121 Engine Speed Signal- Tachometer
- 11-12 — — Not Used
- 13 WHT 85 Cruise Control Engage Signal
- 14 RED/BLK 380 A/C Refrigerant Pressure Sensor Signal
- 15 RED 225 Generator Turn ON Signal
- 16 — — Not Used
- 17 DK GRN/WHT 762 A/C Request Signal
- 18 DK GRN 59 A/C Compressor Clutch Supply Voltage
- 19 — — Not Used
- 20 LT GRN/BLK 822 VSS Low Signal
- 21 PPL/WHT 821 VSS High Signal
- 22-23 — — Not Used24 DK BLU 417 TPS Sensor Signal Pin “C”
- 25 TAN 472 IAT Sensor Signal Pin “B”
- 26 PPL 2121 IC 1 Control
- 27 RED 2127 IC 7 Control
- 28 LT BLU/WHT 2126 IC 6 Control
- 29 DK GRN/WHT 2124 IC 4 Control
- 30 DK BLU 229 Fuel Enable Control
- 31 YEL 492 MAF Sensor Signal Pin “A”
- 32 LT GRN 432 MAP Sensor Signal Pin “B”
- 33 DK BLU 473 High Speed Cooling Fan Relay Control
- 34 DK GRN/WHT 428 EVAP Canister Purge Solenoid Control
- 35 — — Not Used
- 36 BRN 436 AIR Pump Relay Control
- 37 DK GRN 83 Cruise Control Inhibit Signal
- 38 — — Not Used
- 39 RED 631 12 Volt Reference CMP Pin “C”
- 40 BLK 451 Ground
- 41 — — Not Used
- 42 TAN/BLK 422 TCC Solenoid Valve Control Pin “T”
- 43 DK GRN/WHT 459 A/C Clutch Relay Control
- 44 LT GRN 1652 Reverse Lock Out Solenoid Control
- 45 WHT 1310 EVAP Canister Vent Solenoid Control
- 46 BRN/WHT 419 MIL Control
- 47 YEL/BLK 1223 2 – 3 Shift Solenoid Valve Control Pin “B”
- 48 LT GRN 1222 1 – 2 Shift Solenoid Valve Control Pin “A”
- 49 — — Not Used
- 50 DK GRN/WHT 817 VSS Signal
- 51 YEL/BLK 1227 TFT Sensor Signal Pin “L”
- 52 — — Not Used
- 53 GRA/BLK 1687 Ignition Retard Signal EBCM only (Factory)
- 54 PPL 1589 Fuel Level Sensor Signal (Factory)
- 55-56 — — Not Used
- 57 PPL 719 Low Reference IAT Pin “A”
- 58-59 — — Not Used
- 60 BRN 2129 Low Reference Ignition Coils bank 1 (1-3-5-7)
- 61 BRN/WHT 2130 Low Reference Ignition Coils Bank 2 (2-4-6-8)62 — — Not Used
- 63 PNK 1224 Transmission Fluid Pressure Switch Signal A Pin “N”
- 64 DK GRN 890 Fuel Tank Pressure Sensor Signal (Factory)
- 65 — — Not Used
- 66 PPL/WHT 2128 IC 8 Control
- 67 RED/WHT 2122 IC 2 Control
- 68 DK GRN 2125 IC 5 Control
- 69 LT BLU 2123 IC 3 Control
- 70-75 — — Not Used
- 76 LT GRN/WHT 1749 IAC Coil B High Control Pin “B”
- 77 LT GRN/BLK 444 IAC Coil B Low Control Pin “A”
- 78 LT BLU/BLK 1748 IAC Coil A Low Control Pin “C”
- 79 LT BLU/WHT 1747 IAC Coil A High Control Pin “D”
- 80 — — Not Used
That concludes our LS1 ECU Pinout article, for more LS1 related information check our links below.