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