2006 Chevrolet Cobalt SS, 4D Sedan, StandardFACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) C3

Fig 1: Engine Control Module (ECM) C3 Connector End View
GM1335545Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C3 Connector & Terminal Parts Information

Connector Part Information 
  • OEM: 15492321
  • Service: 88988361
  • Description: 73-Way F GT 280 Series Micro 64 Sealed (GY)
Terminal Part Information 
  • Pins: 7, 21, 23, 29, 33, 35, 37, 39, 47, 48, 49, 53, 55, 57, 59, 65
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 28, 44
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C3 Terminal Identification

Pin Wire Color Circuit No. Function
1-6 - - Not Used
7 OG 225 Generator Turn On Signal
8-20 - - Not Used
21 BK/WH 2751 Low Reference
22 - - Not Used
23 OG/BK 469 Low Reference
24-27 - - Not Used
28 TN/WH 1704 Low Reference
29 GY/WH 23 Generator Field Duty Cycle Signal
30-32 - - Not Used
33 TN 2501 High Speed GMLAN Serial Data (-)
34 - - Not Used
35 TN 2761 Low Reference
36 - - Not Used
37 GY 2700 5-Volt Reference - 1
38 - - Not Used
39 GY 2704 5-Volt Reference - 1
40-43 - - Not Used
44 L-BU/BK 1688 5-Volt Reference - 2
45-46 - - Not Used
47 D-GN 1433 PNP/Clutch Start Switch Signal (M86)
48 D-GN/WH 428 EVAP Canister Purge Solenoid Control
49 D-GN 335 Low Speed Cooling Fan Relay Control
50-52 - - Not Used
53 TN/BK 2500 High Speed GMLAN Serial Data (+)
54 - - Not Used
55 YE 410 ECT Sensor Signal
56 - - Not Used
57 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
58 - - Not Used
59 L-GN 432 MAP Sensor Signal
60-64 - - Not Used
65 TN/BK 231 Oil Pressure Switch Signal
66-73 - - 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.

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