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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 appropriate PCM harness connector terminal and appropriate component harness connector terminal. See POWERTRAIN CONTROL MODULE (PCM)  table. See WIRING DIAGRAMS. If harness is open or shorted, repair as necessary.

POWERTRAIN CONTROL MODULE (PCM) (1)

Connector Terminal Wire Color Function
C1 1-2 ***** Not Used
C1 3 ORG Fuel Level Output
C1 4 LT GRN Shift Solenoid A Control
C1 5 DK BLU Cooling Fan High Speed Control
C1 6 DK GRN Cooling Fan Low Speed Control
C1 7 BLK CMP Sensor Signal
C1 8 PPL/WHT CKP 3x Reference Signal
C1 9 LT BLU/BLK CKP 24x Reference Signal
C1 10 & 11 ***** Not Used
C1 12 BLK Engine Coolant Temperature Sensor Ground
C1 13 ORG/BLK MAP Sensor Ground
C1 14 ***** Not Used
C1 15 TAN Serial Data
C1 16 BLK/WHT PCM Ground
C1 17 YEL Intake Air Temperature Sensor Ground
C1 18 ***** Not Used
C1 19 PNK Ignition Voltage
C1 20 ORG Battery Voltage
C1 21-27 ***** Not Used
C1 28 TAN/WHT HO2S Sensor 2 Signal Low
C1 29 TAN HO2S Sensor 1 Signal Low
C1 30 PPL TCC Brake Switch
C1 32 GRY EGR Valve Ground
C1 33 DK BLU Knock Sensor Signal
C1 34 & 35 ***** Not Used
C1 36 BRN Generator Light Signal
C1 37 ***** Not Used
C1 38 LT GRN Idle Air Control B High
C1 37-42 ***** Not Used
C1 43 BLK Injector No. 1 Control
C1 44 YEL/BLK Shift Solenoid B Control
C1 45 ***** Not Used
C1 46 PNK/BLK Injector No. 3 Control
C1 47 LT GRN/BLK Injector No. 2 Control
C1 48 RED/BLK Reference Low
C1 49-52 ***** Not Used
C1 53 TAN/BLK By-Pass
C1 54 WHT Ignition Control
C1 55 DK GRN 4k Pulse Per Mile
C1 56 BLK/WHT PCM Ground
C1 57 BLK/WHT PCM Ground
C1 58 ***** Not Used
C1 59 PPL Serial Data (Class 2)
C1 60 BLK/WHT PCM Ground
C1 61 PPL TP Sensor Ground
C1 62 & 63 ***** Not Used
C1 64 YEL Vehicle Speed Sensor High
C1 65 PPL Vehicle Speed Sensor Low
C1 66 & 67 ***** Not Used
C1 68 YEL Transmission Range B Input
C1 69 YEL Mass Air Flow Sensor Signal
C1 70 DK BLU Theft Deterrent Input
C1 71 ORG/BLK Required Torque
C1 72 DK GRN Cruise Control Inhibit
C1 73 BLK/WHT Injector No. 5 Control
C1 74 ***** Not Used
C1 75 DK GRN Engine Hot Lamp Control
C1 76 DK GRN/WHT EVAP Canister Purge Control
C1 77-78 ***** Not Used
C1 79 YEL/BLK Injector No. 6 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 RED EGR Valve Control
C2 5 BRN/WHT MIL Control
C2 6 BRN/WHT Low Oil Level Light Control
C2 7 LT BLU/WHT Intake Air Control Valve A High
C2 8 WHT Tachometer Output
C2 9 TAN/BLK Delivery Torque
C2 10 PPL HO2S Sensor 1 Signal High
C2 11 PPL/WHT HO2S Sensor 2 Signal High
C2 12-15 ***** Not Used
C2 16 WHT Transaxle Range Park
C2 17 ***** Not Used
C2 18 BLK/WHT Transaxle Range Drive
C2 19-21 ***** Not Used
C2 22 DK GRN/WHT A/C Request Signal
C2 23 & 24 ***** Not Used
C2 25 LT GRN MAP Sensor Signal
C2 26 YEL ECT Sensor Signal
C2 27 RED/BLK A/C Refrigerant Pressure Sensor Signal
C2 28 BRN EGR Pintle Position Signal
C2 29-32 ***** Not Used
C2 33 GRY Reference Voltage A
C2 34 GRY Reference Voltage B
C2 35 ORG Sensor Ground
C2 36-38 ***** Not Used
C2 39 DK GRN/WHT A/C Compressor Relay Control
C2 40 & 41 ***** Not Used
C2 42 LT BLU/BLK Injector No. 4 Control
C2 43 ***** Not Used
C2 44 LT BLU/BLK Intake Air Control Valve A Low
C2 45-48 ***** Not Used
C2 49 LT GRN/BLK Intake Air Control Valve B Low
C2 50 TAN Intake Air Temperature Sensor Signal
C2 51-54 ***** Not Used
C2 55 DK GRN Fuel Tank Pressure Sensor Signal
C2 56 GRY Transaxle Range C
C2 57 ***** Not Used
C2 58 BRN Engine Oil Level Sensor Signal
C2 59 WHT Cruise Status
C2 60 ***** Not Used
C2 61 RED Generator Control
C2 62-65 ***** Not Used
C2 66 DK BLU Throttle Position Sensor Signal
C2 67 ***** Not Used
C2 68 YEL/BLK Transaxle Fluid Temperature Sensor
C2 69 PPL Fuel Level Input
C2 70 & 71 ***** Not Used
C2 72 RED/WHT CMP Sensor Ignition Voltage
C2 73 BLK CMP Sensor Ground
C2 74-77 ***** Not Used
C2 78 BRN TCC PWM Solenoid Control
C2 79 TAN/BLK TCC Enable Solenoid
C2 80 ***** Not Used
(1) See Fig 1.
Fig 1: Identifying Powertrain Control Module (PCM) Harness Connector Terminals
G98G00865Courtesy of GENERAL MOTORS CORP.