2005 Pontiac Vibe GTFACTORY OEM SERVICE PROCEDURE

Powertrain Control Module (PCM) Connector End Views

Identifying PCM Connector C1 (Back View)

GM789637Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 34-Pin
  • WH
Pin Wire Color Function
1 YE Fuel Injector 1 Control
2 BK Fuel Injector 2 Control
3 WH Fuel Injector 3 Control
4 BU Fuel Injector 4 Control
5 BN Ground
6 WH/BK Ground
7 WH/BK Ground
8 RD/BU Ignition Trigger Signal Coil 1
9 YE/GN Ignition Trigger Signal Coil 2
10 GY Ignition Trigger Signal Coil 3
11 WH Ignition Trigger Signal Coil 4
12 BK Crank Signal
13 BK/YE Camshaft Position (CMP) Actuator Solenoid Valve High Control
14 YE Camshaft Position (CMP) Actuator Solenoid Valve Control Low
15 BU/WH Auxiliary Intake Air Control Solenoid Control
16 BK/BU Idle Air Control (IAC) Valve Control
17 - Not Used
18 YE 5-Volt Reference Circuit
19 WH Engine Coolant Temperature (ECT) Sensor Input
20 YE/BK Intake Air Temperature (IAT) Sensor Input
21 L-GN Throttle Position (TP) Sensor Input
22-23 - Not Used
24 BU/YE Ignition Fail Safe Input
25 RD EVAP Canister Vent Solenoid Valve Control
26 BK Camshaft Position (CMP) Sensor Input
27 BK Crankshaft Position (CKP) Sensor Input
28 BN Sensor Ground
29 BU/WH Mass Air Flow (MAF) Sensor Signal Low
30 GN Mass Air Flow (MAF) Sensor Signal High
31-33 - Not Used
34 WH CMP Sensor and CKP Sensor Ground
Identifying PCM Connector C2 (Back View)

GM789639Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 35-Pin
  • WH
Pin Wire Color Function
1 BK Knock Sensor (KS) Signal High
2 WH Knock Sensor (KS) Signal Low
3-5 - Not Used
6 PK Heated Oxygen Sensor (HO2S) 1 Heater Circuit Control
7 WH/BK Ground
8 GY EVAP Vacuum Leak Pump Control
9 L-GN/BK Fan 2 Relay Control
10-15 - Not Used
16 BU/YE Rocker Arm Oil Control Solenoid Valve Control High
17 BK Rocker Arm Oil Control Solenoid Valve Control Low
18 - Not Used
19 BU/BK EVAP Canister Purge Solenoid Valve Control
20 - Not Used
21 L-GN Fan 1 Relay Control
22 RD Heated Oxygen Sensor (HO2S) 1 Input
23-26 - Not Used
27 YE AC Pressure Switch
28 WH/BK Ground
29 - Not Used
30 BU/RD Power Steering Pressure (PSP) Switch Input
31-35 - Not Used
Identifying PCM Connector C3 (Back View)

GM789640Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 35-Pin
  • WH
Pin Wire Color Function
1-2 - Not Used
3 BK Engine Speed Output
4 BK/WH EFI Relay High Control
5 YE/BK AC Compressor Clutch Relay Control
6-7 - Not Used
8 BU/WH Cruise Control Idle
9-13 - Not Used
14 YE/RD Engine Coolant Temperature Gage Output
15 BU/RD Serial Data
16 GN/RD Circuit Opening Relay Control
17 PU/WH Vehicle Speed Sensor (VSS) Input
18 - Not Used
19 GN/WH Brake Switch Signal
20-22 - Not Used
23 WH Heated Oxygen Sensor (HO2S) 2 Input
24-30 - Not Used
31 BK/WH Rocker Arm Oil Pressure Switch Input
32 BK/BU Evaporator Temperature Sensor Input
33 GN/WH AC On Signal
34 GN Secondary AIR Pressure Sensor Input
35 - Not Used
Identifying PCM Connector C4 (Back View)

GM789641Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 31-Pin
  • WH
Pin Wire Color Function
1 BK Ignition Positive Voltage
2 - Not Used
3 RD/WH Battery Voltage
4 BK/BU Secondary AIR Solenoid Valve Control
5 BK/OG Secondary AIR Pump Relay Control
6 - Not Used
7 PK/BK Heated Oxygen Sensor (HO2S) 2 Heater Circuit Control
8 - Not Used
9 BK/OG Ignition Positive Voltage
10 YE AC Request Signal
11 RD/YE MIL Control
12 GN Electrical Load Idle-Up Signal, Tail Lamps
13 WH Electrical Load Idle-Up Signal, Rear Defogger
14 YE Supplemental Inflatable Restraint (SIR) System Signal
15-18 - Not Used
19 PK Data Link Connector (DLC)
20 PK/BK Diagnostic Request Circuit
21 BU Fuel Tank Pressure (FTP) Sensor Input
22-31 - Not Used
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.