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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 1-5 ***** Not Used
C1 6 ORG/BLK (2) Ground
C1 7 BRN/WHT CMP Sensor Signal
C1 8 PPL/WHT CKP 7x Reference Signal
C1 9 ***** Not Used
C1 10 GRY Fuel Tank Pressure Sensor Reference Voltage
C1 11-17 ***** Not Used
C1 180 BLK/WHT PCM Ground
C1 19 PNK Ignition Voltage
C1 20 ORN Battery Voltage
C1 21 DK BLU TP Sensor Signal
C1 22-24 ***** Not Used
C1 25 ORN Ignition Control B
C1 26 WHT Ignition Control A
C1 27 ***** Not Used
C1 28 RED Transmission Range C Input
C1 29 BLK/WHT PRNDL A Input
C1 30-32 ***** Not Used
C1 33 DK BLU KS Signal
C1 34 ***** Not Used
C1 35 PPL TCC Brake Switch Input
C1 36 LT BLU A/C Request Signal
C1 37-44 ***** Not Used
C1 45 DK GRN Fuel Tank Pressure Sensor Signal
C1 46 YEL/BLK TFT Sensor Signal
C1 47 & 48 ***** Not Used
C1 49 RED/BLK A/C Refrigerant Pressure Sensor Signal
C1 50 & 51 ***** Not Used
C1 52 BLK A/C Refrigerant Pressure Sensor Ground
C1 53 ***** Not Used
C1 54 YEL ECT Sensor Signal
C1 55 PPL Fuel Level Sensor Input
C1 56 ***** Not Used
C1 57 BLK TP Sensor Ground
C1 58 YEL Serial Data (Class II)
C1 59 DK GRN Serial Data (Class I)
C1 60 BLK/WHT PCM Ground
C1 61 PNK IGN 2
C1 62 LT GRN MAP Sensor Signal
C1 63 PPL/WHT VSS High
C1 64 & 65 ***** Not Used
C1 66 BLK EGR Solenoid Ground
C1 67 DK BLU Transmission Range B Input
C1 68 PNK Transmission Range A Input
C1 69 YEL PRNDL B
C1 70 YEL/BLK High Resolution Vehicle Speed Output
C1 71 ***** Not Used
C1 72 GRY PRNDL C
C1 73 WHT PRNDL P
C1 74 RED Generator Terminal L
C1 75 BLK Fuel Injector No. 1 Control
C1 76 LT GRN/BLK Fuel Injector No. 2 Control
C1 77-80 ***** Not Used
C2 1-5 ***** Not Used
C2 6 RED/BLK Pressure Control Solenoid High Control
C2 7 RED EGR Valve Ignition Feed
C2 8 DK GRN/WHT Fuel Pump Relay Control
C2 9 LT BLU/WHT Pressure Control Solenoid Low Control
C2 10 WHT Tachometer Output
C2 11-13 ***** Not Used
C2 14 BLK/WHT MAP Sensor Ground
C2 15 ***** Not Used
C2 16 DK GRN/WHT VSS Output (Cluster)
C2 17 DK GRN VSS Output (Cruise)
C2 18 ***** Not Used
C2 19 BRN EGR Pintle Position Signal
C2 20 TAN IAT Sensor Signal
C2 21 TAN HO2S 1 Low
C2 22 PPL HO2S 1 Signal
C2 23 TAN/WHT HO2S 2 Low
C2 24 PPL/WHT HO2S 2 Signal
C2 25 & 26 ***** Not Used
C2 27 BRN ECT Sensor Ground
C2 28 GRY IAT Sensor Ground
C2 29 BLK TFT Sensor Ground
C2 30 ***** Not Used
C2 31 RED/BLK ICM Reference Low
C2 32 GRY EGR Valve Reference Voltage
C2 33 GRY TP Sensor Reference Voltage
C2 34 GRY A/C Pressure Sensor Reference Voltage
C2 35 GRY MAP Sensor Reference Voltage
C2 36 RED CMP Sensor Battery Voltage Supply
C2 37-45 ***** Not Used
C2 46 BRN/WHT MIL Control
C2 47 ***** Not Used
C2 48 LT BLU/BLK Cruise Engaged Input
C2 49 ***** Not Used
C2 50 TAN/BLK TCC Solenoid Control
C2 51 YEL/BLK 2-3 Shift Solenoid Control
C2 52 WHT 3-2 Shift Solenoid Control
C2 53 LT GRN 1-2 Shift Solenoid Control
C2 54 ***** Not Used
C2 55 DK GRN/WHT A/C Clutch Relay Control
C2 56 DK GRN/WHT EVAP Canister Purge Valve Control
C2 57 BRN TCC PWM Solenoid Control
C2 58 WHT EVAP Canister Vent Solenoid Control
C2 59-61 ***** Not Used
C2 62 LT GRN/BLK VSS Low
C2 63 PNK/BLK CMP Ground
C2 64 BLK/WHT PCM Ground
C2 65 BLK Fuel Level Buffer Module Ground
C2 66-70 ***** Not Used
C2 71 LT BLU/WHT IAC Coil A High
C2 72 LT GRN/WHT IAC Coil B High
C2 73 LT GRN/BLK IAC Coil B Low
C2 74 LT BLU/BLK IAC Coil A Low
C2 75 LT BLU/BLK Fuel Injector No. 4 Control
C2 76 PNK/BLK Fuel Injector No. 3 Control
C2 77-80 ***** Not Used
(1) See Fig 1 .
(2) Fuel tank pressure sensor, fuel level sensor and fuel pump grounds.
Fig 1: Identifying Powertrain Control Module (PCM) Harness Connector Terminals
G98F00864Courtesy of GENERAL MOTORS CORP.
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