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PCM Harness Resistance

Turn ignition switch to LOCK position. Disconnect PCM and appropriate component harness connectors. Check for open or short circuits between PCM harness connector terminal and component harness connector terminal. See POWERTRAIN CONTROL MODULE (PCM) CONNECTOR I.D.  table. See WIRING DIAGRAMS article. If harness is open or shorted, repair as necessary.

Fig 1: Identifying Powertrain Control Module (PCM) Harness Connector Terminals
G98F00864Courtesy of GENERAL MOTORS CORP.
POWERTRAIN CONTROL MODULE (PCM) CONNECTOR I.D. (1)

Connector Terminal Wire Color Function
C1 1 & 2 ***** Not Used
C1 3 (2) WHT EVAP Canister Vent Valve Control
C1 4 BRN/WHT Camshaft Position Sensor Signal
C1 5 & 6 ***** Not Used
C1 7 YEL Vehicle Speed Sensor High
C1 8 ***** Not Used
C1 9 PNK/BLK Fuel Injector No. 3 Control
C1 10 ***** Not Used
C1 11 DK BLU (2) VTD Fuel Enable
C1 12 LT BLU/BLK Fuel Injector No. 4 Control
C1 13 (3) RED/WHT Fuel Injector No. 2 Control
C1 14 GK GRN A/C Clutch Status
C1 15 BLK/WHT Fuel Injector No. 5 Control
C1 16 & 17 ***** Not Used
C1 18 YEL/BLK Fuel Injector No. 6 Control
C1 19 & 20 ***** Not Used
C1 21 PPL Intake Air Temperature Sensor Ground
C1 22 DK BLU Transmission Range Switch B Signal
C1 23 LT GRN/BLK Fuel Injector No. 2 Control
C1 24 BLK/WHT Sensor Ground Jumper
C1 25 PNK Transmission Range Switch A Signal
C1 26 BLK/WHT PRND A
C1 27 RED/BLK Fuel Injector No. 7 Control
C1 28 & 29 ***** Not Used
C1 30 GRY/BLK (4) Spark Retard Signal
C1 31 DK BLU/WHT Fuel Injector No 8 Control
C1 32 ORG/BLK Park Neutral Position Switch Signal
C1 33 BLK Fuel Injector No. 1 Control
C1 34 GRY (5) Skip Shift Solenoid Control
C1 35 LT GRN 1-2 Shift Solenoid
C1 36 DK BLU (2) Fuel Gauge Output Control
C1 37 BRN/WHT Malfunction Indicator Light Control
C1 38 ***** Not Used
C1 39 DK GRN/WHT A/C Clutch Relay Control
C1 40 WHT (6) Skip Shift Light Control (M/T)
C1 41 BRN/WHT (7) Low Oil Level Indicator Light Control
C1 42 LT GRN Reverse Inhibit Solenoid Control
C1 43 DK GRN Coooling Fan Relay No. 1 Control
C1 44 (8) YEL Crankshaft Position Sensor Signal
C1 45 DK GRN/WHT EVAP Canister Purge Valve Control
C1 46 ORG/BLK Desired Torque
C1 47 DK GRN/WHT A/C Request Signal
C1 48 YEL Mass Airflow Sensor Signal
C1 49 PPL Ignition No. 1 Control
C1 50 & 51 ***** Not Used
C1 52 (9) PPL/WHT Ignition No. 8 Control
C1 53 RED Ignition No. 7 Control
C1 54 LT BLU/WHT Ignition No. 6 Control
C1 55 DK GRN/WHT Vehicle Speed Sensor Signal
C1 56 DK GRN Ignition No. 5 Control
C1 57 DK GRN/WHT Ignition No. 4 Control
C1 58 LT BLU Ignition No. 3 Control
C1 59 BRN/WHT Ignition Control Reference Low Bank No. 2
C1 60 BRN Ignition Control Reference Low Bank No. 1
C1 61 RED Transmission Range C Signal
C1 62 BLK (2) EGR Pintle Position Ground
C1 63 BLK A/C Pressure Sensor Ground
C1 64 BLK Engine Oil Pressure Switch Ground
C1 65 GRY PRND C
C1 66 YEL PRND B
C1 67 ***** Not Used
C1 68 GRY Clutch Switch Signal
C1 69 BRN EVAP Purge Vacuum Switch Signal
C1 70 ***** Not Used
C1 71 PPL Vehicle Speed Sensor Signal Low
C1 72 (10) BLK Powertrain Control Module Ground
C1 73 GRY Extended Brake Travel Switch Signal
C1 74 ***** Not Used
C1 75 GRY Fuel Tank Pressure Sensor Ground
C1 76 (10) BLK Powertrain Control Module Ground
C1 77 PPL Torque Converter Clutch Brake Switch
C1 78-80 ***** Not Used
C2 1 TAN Heater Oxygen Sensor Signal Low Bank No. 2; Sensor No. 2)
C2 2 TAN/WHT Heater Oxygen Sensor Signal Low Bank No. 1; Sensor No. 2)
C2 3 TAN (2) Serial Data (UART)
C2 4 RED Camshaft Position Sensor Voltage Supply
C2 5 TAN Heater Oxygen Sensor Signal Low Bank No. 2; Sensor No. 1)
C2 6 TAN/WHT Heater Oxygen Sensor Signal Low Bank No. 1; Sensor No. 1)
C2 7 RED/BLK A/C Pressure Sensor Signal
C2 8 TAN Intake Air Temperature Sensor Signal
C2 9 BRN (2) EGR Pintle Position Sensor Siganl
C2 10 (11) PPL Fuel Level Sensor Signal
C2 11 GRY Generator Terminal F
C2 12 DK BLU (12) Throttle Position Sensor Signal
C2 13 YEL/BLK Transmission Fluid Temperature Sensor Signal
C2 14 ORG/BLK Transmission Fluid Temperature Sensor Ground
C2 15-18 ***** Not Used
C2 19 PNK Powertrain Control Module Ignition Voltage
C2 20 ORG Powertrain Control Module Battery Voltage
C2 21 (10) BLK Powertrain Control Module Ground
C2 22 YEL/BLK Crankshaft Position Sensor Ground
C2 23 BLK (2) Throttle Position Sensor Ground
C2 24 BLK/WHT Sensor Ground Jumper
C2 25 BRN Engine Coolant Temperature Ground
C2 26 ORG/BLK Manifold Absolute Pressure Sensor Ground
C2 27 ***** Not Used
C2 28 DK BLU Cooling Fan Relays No. 2 & 3 Control
C2 29 ***** Not Used
C2 30 BRN Air Pump Relay Control
C2 31 PPL v
C2 32 TAN/BLK Torque Converter Clutch Solenoid Valve Control
C2 33 BRN Torque Converter Clutch (PWM) Solenoid Valve Control
C2 34 GRY (2) EGR Valve Ground
C2 35 WHT Tachometer Output Signal
C2 36 LT BLU/WHT Transmission Fluid Pressure Control Solenoid Control Low
C2 37 DK GRN/WHT Fuel Pump Relay Control
C2 38 LT BLU (2) EGR Valve Control
C2 39 RED/BLK Transmission Fluid Pressure Control Solenoid Control High
C2 40 TAN/BLK Torque Delivered
C2 41 PPL Heated Oxygen Sensor Signal High (Bank No. 2; Sensor No. 2)
C2 42 PPL/WHT Heated Oxygen Sensor Signal High (Bank No. 1; Sensor No. 2)
C2 43 GRY (2) Throttle Position Sensor Reference Voltage
C2 44 GRY Fuel Level Sensor Reference Voltage
C2 45 GRY Engine Oil Pressure Sensor Reference Voltage
C2 46 PPL Heated Oxygen Sensor Signal High (Bank No. 2; Sensor No. 1)
C2 47 PPL/WHT Heated Oxygen Sensor Signal High (Bank No. 1; Sensor No. 1)
C2 48 LT GRN Manifold Absolute Pressure Sensor Signal
C2 49 YEL Engine Coolant Temperature Sensor Signal
C2 50 & 51 ***** Not Used
C2 52 DK GRN (2) Fuel Tank Pressure Sensor Signal
C2 53 TAN/WHT Engine Oil Pressure Sensor Signal
C2 54 LT GRN/BLK (2) Idle Air Control Coil B Low
C2 55 LT BLU/BLK (2) Idle Air Control Coil A Low
C2 56 LT BLU/WHT (2) Idle Air Control Coil A High
C2 57 LT GRN/WHT (2) Idle Air Control Coil B High
C2 58 (13) PPL Serial Data Class II)
C2 59 ***** Not Used
C2 60 (10) BLK Powertrain Control Module Ground
C2 61 ORG Powertrain Control Module Battery Voltage
C2 62 LT GRN Crankshaft Position Sensor Ignition Voltage
C2 63 ***** Not Used
C2 64 GRY Manifold Absolute Pressure Reference Voltage
C2 65 GRY (2) Reference Voltage
C2 66 GRY A/C Pressure Sensor Reference Voltage
C2 67 GRY (2) Reference Voltage
C2 68 LT BLU Rear Knock Sensor Signal
C2 69 DK BLU Front Knock Sensor Signal
C2 70 PNK/BLK Camshaft Position Sensor Ground
C2 71-75 TAN TAC Module Serial Data
C2 71-75 ORG/BLK TAC Module Serial Data
C2 73-75 ***** Not Used
C2 76 BRN Oil Level Sensor Signal
C2 77 RED Generator Terminal L
C2 78-80 ***** Not Used
(1) See Fig 1 .
(2) Not used.
(3) Purple/White wire.
(4) Real time damping (Dark Blue wire).
(5) On A/T models, 3-2 shift solenoid (White wire).
(6) Shift solenoid B (Yellow/Black wire) on A/T models.
(7) Powertrain Control Module pitch output Pink/White wire).
(8) Dark Blue/White wire.
(9) Red/White wire.
(10) Black/White wire.
(11) Dark Blue wire.
(12) Fuel level sensor signal.
(13) Dark Green wire.
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