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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 - 3.8L 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 ***** Not Used
C1 2 PPL/WHT 2nd Gear Indicator
C1 3 DK BLU Fuel Level Output Control
C1 4 LT GRN 1-2 Shift Solenoid Control
C1 5 DK BLU Cooling Fan High Speed Control
C1 6 DK GRN Cooling Fan Low Speed Control
C1 7 BLK Camshaft Position Sensor Signal
C1 8 PPL/WHT Crankshaft Position 3x Sensor Reference Signal
C1 9 LT BLU/BLK Crankshaft Position 18x Sensor Signal
C1 10 & 11 ***** Not Used
C1 12 BRN Engine Coolant Temperature Sensor Ground
C1 13 ORG/BLK Manifold Absolute Pressure Sensor Ground
C1 14 ***** Not Used
C1 15 TAN Serial Data
C1 16 BLK/WHT Powertrain Control Module Ground
C1 17 PPL Intake Air Temperature Sensor Ground
C1 18 ***** Not Used
C1 19 PNK Ignition Voltage
C1 20 ORG Battery Voltage
C1 21 ***** Not Used
C1 22 PNK Transmission Fluid Pressure Switch A Input
C1 23-26 ***** Not Used
C1 27 TAN/WHT Heated Oxygen Sensor No. 1 Signal Low (Bank No. 1)
C1 28 GRY Heated Oxygen Sensor No. 3 Signal Low (Bank No. 1)
C1 29 TAN Heated Oxygen Sensor No. 1 Signal Low (Bank No. 2)
C1 30 PPL Torque Converter Clutch Brake Switch Input
C1 31 BLK Sensor Ground
C1 32 GRY EGR Valve Ground
C1 33 DK BLU Bank No. 1 Knock Sensor Signal
C1 34 LT BLU Bank No. 2 Knock Sensor Signal
C1 35 ***** Not Used
C1 36 RED Generator Control
C1 37 ***** Not Used
C1 38 LT GRN/WHT Idle Air Control Valve B High
C1 39-42 ***** Not Used
C1 43 YEL/BLK Fuel Injector No. 6 Control
C1 44 YEL/BLK 2-3 Shift Solenoid Control
C1 45 ***** Not Used
C1 46 LT BLU/BLK Fuel Injector No. 4 Control
C1 47 BLK/WHT Fuel Injector No. 5 Control
C1 48 RED/BLK Reference Low
C1 49-52 ***** Not Used
C1 53 TAN/BLK Bypass Valve Control
C1 54 WHT Ignition Control
C1 55 DK GRN/WHT Vehicle Speed Sensor Signal Output
C1 56 BLK/WHT Powertrain Control Module Ground
C1 57 BLK/WHT Powertrain Control Module Ground
C1 58 ***** Not Used
C1 59 PPL Serial Data (Class II)
C1 60 BLK/WHT Powertrain Control Module Ground
C1 61 BLK Throttle Position Sensor Ground
C1 62 & 63 ***** Not Used
C1 64 YEL Vehicle Speed Sensor High
C1 65 PPL Vehicle Speed Sensor Low
C1 66-68 ***** Not Used
C1 69 YEL Mass Airflow Sensor Signal
C1 70 DK BLU Theft Deterrent Fuel Enable
C1 71 ***** Not Used
C1 72 DK GRN Cruise Control Disable Signal
C1 73 LT GRN/BLK Fuel Injector No. 2 Control
C1 74 & 75 ***** Not Used
C1 76 DK GRN EVAP Canister Purge Valve Control
C1 77 & 78 ***** Not Used
C1 79 BLK Fuel Injector No. 1 Control
C1 80 ***** Not Used
C2 1 ***** Not Used
C2 2 WHT EVAP Canister Vent Valve Control
C2 3 DK GRN/WHT Fuel Pump Relay Control
C2 4 LT BLU EGR Valve Control
C2 5 BRN/WHT Malfunction Indicator Light Control
C2 6 BRN/WHT Low Oil Level Light Control
C2 7 LT BLU/WHT Idle Air Control Valve A High
C2 8 & 9 ***** Not Used
C2 10 PPL Heated Oxygen Sensor No. 1 Signal (Bank No. 2)
C2 11 DK BLU Heated Oxygen Sensor No. 3 Signal (Bank No. 1)
C2 12 PPL/WHT Heated Oxygen Sensor No. 1 Signal (Bank No. 1)
C2 13-15 ***** Not Used
C2 16 ORG/BLK Park Neutral Position Switch Signal
C2 17 RED Transmission Range C
C2 18 GRY Cruise Control/ Clutch Anticipate Switch
C2 19 & 20 ***** Not Used
C2 21 BRN/WHT 2nd Gear Start Signal
C2 22 DK GRN/WHT A/C Request Signal
C2 23 PPL/WHT Starter Signal
C2 24 ***** Not Used
C2 25 LT GRN Manifold Absolute Pressure Sensor Signal
C2 26 YEL Engine Coolant Temperature Sensor Signal
C2 27 RED/BLK A/C Pressure Sensor Signal
C2 28 BRN EGR Pintle Position Signal
C2 29-32 ***** Not Used
C2 33 GRY Sensor Reference Voltage
C2 34 LT BLU/BLK Sensor Reference Voltage
C2
x		 35 ORG/BLK Sensor Ground
C2 36-38 ***** Not Used
C2 39 DK GRN/WHT A/C Clutch Relay Control
C2 40 & 41 ***** Not Used
C2 42 PNK/BLK Fuel Injector No. 3 Control
C2 43 ***** Not Used
C2 44 LT BLU/BLK Idle Air Control Valve A Low
C2 45 RED/BLK Pressure Control Solenoid High
C2 46 LT BLU/WHT Pressure Control Solenoid Low
C2 47 ***** Not Used
C2 48 WHT 3-2 Shift Solenoid Control
C2 49 LT GRN/BLK Idle Air Control Valve B High
C2 50 TAN Intake Air Temperature Sensor
C2 51-54 ***** Not Used
C2 55 DK GRN Fuel Tank Pressure Sensor Signal
C2 56 ***** Not Used
C2 57 DK BLU Transmission Fluid Pressure Switch B
C2 58 BRN Engine Oil Level Sensor Signal
C2 59 WHT Cruise Control Status
C2 60 ***** Not Used
C2 61 BRN Generator Terminal L Control
C2 62-65 ***** Not Used
C2 66 DK BLU Throttle Position Sensor Signal
C2 67 ***** Not Used
C2 68 YEL/BLK Transmission Fluid Temperature Sensor
C2 69 PPL Fuel Level Sensor Input
C2 70-75 ***** Not Used
C2 76 YEL/BLK Start Enable
C2 77 ***** Not Used
C2 78 BRN Torque Converter Clutch PWM Solenoid Control
C2 79 TAN/BLK Torque Converter Clutch Enable Control
C2 80 ***** Not Used
(1) See Fig 1 .
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