Page 1 of 5 Service Manual: VCM CONNECTOR TERMINAL IDENTIFICATION VCM CONNECTOR TERMINAL IDENTIFICATION 1999 Chevrolet Tahoe 5.7L Eng Fig 1: Identifying Control Module Harness Connector Terminals (4.3L, 4.8L, 5.0L, 5.3L, 5.7L, 6.0L & 7.4L) Courtesy of GENERAL MOTORS CORP. VEHICLE CONTROL MODULE CONNECTOR TERMINAL IDENTIFICATION (5.0L& 5.7L GASOLINE - ESCALADE, EXPRESS, SAVANA, PICKUP, TAHOE & YUKON) (1)
Page 2 of 5 Connector Terminal No. Wire Color Function C1 1 & 2... Not Used C1 3 BRN/WHT 1X CMP Sensor Signal C1 4-6... Not Used C1 7 TAN HO2S 1 Bank 2 Low C1 8 PNK/BLK CMP Sensor Ground C1 9 PPL Fuel Level Output C1 10 TAN/BLK TCC Solenoid Control C1 11 & 12... Not Used C1 13 WHT 3-2 Shift Solenoid Control C1 14 BRN AIR Pump Relay Control C1 15 YEL/BLK VSS Output C1 16-18... Not Used C1 19 PPL/WHT HO2S 1 Bank 1 High C1 20 PPL HO2S 2 Bank 2 High (Under 8600 GVW); HO2S 2 Bank 1 High (Over C1 21 PPL HO2S 1 Bank 2 High C1 22 PPL/WHT HO2S 2 Bank 1 High (Under 8600 GVW); HO2S 2 Bank 2 High (Over C1 23... Not Used C1 24 TAN HO2S 2 Bank 2 Low (Under 8600 GVW); HO2S 2 Bank 1 Low (Over C1 25 TAN/WHT HO2S 1 Bank 1 Low C1 26 TAN/WHT HO2S 2 Bank 1 Low (Under 8600 GVW); HO2S 2 Bank 2 Low (Over C1 27... Not Used C1 28 PPL CKP Sensor Ground C1 29 LT GRN/BLK VSS Low C1 30 PPL/WHT VSS High
Page 3 of 5 C1 31 YEL 4X CKP Sensor Signal C1 32... Not Used C2 1... Not Used C2 2 WHT EVAP Canister Vent Solenoid Control C2 3... Not Used C2 4 YEL/BLK 2-3 Shift Solenoid Control C2 5... Not Used C2 6 LT GRN 1-2 Shift Solenoid Control C2 7 BRN TCC PWM Solenoid Control C2 8 BLK Fuel Injector No. 1 Control C2 9 DK BLU/WHT Fuel Injector No. 8 Control C2 10 BRN EGR Pintle Position Signal C2 11 LT GRN/BLK Fuel Injector No. 2 Control C2 12 RED/BLK Fuel Injector No. 7 Control C2 13 LT GRN/WHT IAC Coil "B" High C2 14 LT BLU/WHT IAC Coil "A" High C2 15 BLK/WHT Fuel Injector No. 5 Control C2 16 YEL/BLK Fuel Injector No. 6 Control C2 17 & 18... Not Used C2 19 DK BLU Knock Sensor Input C2 20... Not Used C2 21 LT GRN MAP Sensor Signal C2 22 TAN IAT Sensor Signal C2 23 YEL ECT Sensor Signal C2 24 DK BLU TP Sensor Signal C2 25 DK GRN Fuel Tank Pressure Sensor Signal C2 26... Not Used C2 27 YEL/BLK Transmission Fluid Temperature Sensor Signal (A/T) C2 28 YEL MAF Sensor Signal C2 29 LT GRN/BLK IAC Coil "B" Low C2 30 LT BLU/BLK IAC Coil "A" Low
Page 4 of 5 C2 31 LT BLU/BLK Fuel Injector No. 4 Control C2 32 PNK/BLK Fuel Injector No. 3 Control C3 1 DK GRN/WHT A/C Compressor Clutch Relay Control C3 2 DK GRN/WHT EVAP Canister Purge Solenoid Control C3 3... Not Used C3 4 BLK Sensor Ground C3 5... Not Used C3 6 RED/BLK Pressure Control Solenoid High C3 7 DK BLU/WHT Transmission Input Shaft Speed Sensor Low C3 8 RED/BLK Transmission Input Shaft Speed Sensor High C3 9 WHT IC Control C3 10... Not Used C3 11 RED Transmission Range "C" Input C3 12 GRY Sensor Reference Voltage C3 13 PPL/WHT Fuel Level Sensor Signal C3 14 DK BLU A/C Recirculation Signal C3 15... Not Used C3 16 LT BLU/WHT Pressure Control Solenoid Low C3 17 BLK/WHT VCM Ground C3 18 BLK/WHT VCM Ground C3 19 BLK Sensor Ground C3 20... Not Used C3 21 ORN Battery Positive Voltage (B+) C3 22 DK BLU Transmission Range "B" Input C3 23 PNK Transmission Range "A" Input C3 24... Not Used C3 25 DK GRN/WHT A/C Request Signal C3 26... Not Used C3 27 GRY 5 Volt Reference C3 28 & 29... Not Used
Page 5 of 5 C3 30 DK GRN A/C Cycling Switch Signal C3 31 & 32... Not Used C4 1 DK GRN/WHT Fuel Pump Relay Control C4 2... Not Used C4 3 DK GRN/WHT VSS Output C4 4 DK GRN VSS Output C4 5 BRN/WHT MIL Control C4 6... Not Used C4 7 DK GRN Recirculation Door Motor Control C4 8... Not Used C4 9 DK BLU Auxiliary Fan C4 10 PPL Brake Switch Input C4 11 PPL Serial Data (Class 2) C4 12 BLK Dual Fuel Module Return C4 13 BRN Ignition Positive Voltage C4 14... Not Used C4 15 TAN/BLK Shift Light (M/T) C4 16 RED EGR Valve Control C4 17... Not Used C4 18 PNK Ignition Positive Voltage C4 19 BLK/WHT 4WD Wheel Lock Input C4 20 WHT EGR Valve Ground C4 21... Not Used C4 22 BRN/WHT CPP Switch Signal (M/T) C4 23 GRY/BLK 4WD Indicator Signal Input C4 24 LT BLU/BLK Cruise Engaged Input (1) See Fig 1.