2006 Pontiac Solstice AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) C3

Fig 1: ECM C3 Connector View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) Connector End Views

Connector Part Information 
  • OEM: 12582678
  • Service: See Catalog
  • Description: 73-Way F
Terminal Part Information 
  • Pins:
  • Terminal: TBD
  • Core/Insulation Crimp: TBD
  • Release Tool/Test Probe: TBD
Engine Control Module (ECM) C3

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 Signal Ground (C60 w/LE5)
22 - - Not Used
23 OG/BK 469 Manifold Absolute Pressure Sensor Low Reference (LE5)
24-27 - - Not Used
28 TN/WH 1704 Sensor Low Reference (LE5)
29 GY 23 Generator Field Duty Cycle Signal
30-32 - - Not Used
33 TN 2501 High Speed GMLAN Serial Data (-) (1)
34 - - Not Used
35 TN 2761 Coolant Temperature Sensor Low Reference (LE5)
36 - - Not Used
37 GY 2700 A/C Pressure Sensor 5-Volt Reference (C60 w/LE5)
38 - - Not Used
39 GY 2704 Manifold Absolute Pressure Sensor 5-Volt Reference (LE5)
40-43 - - Not Used
44 L-BU/BK 1688 5-Volt Reference (LE5)
45 - - Not Used
46 OG/BK 1786 Transmission Park/Neutral Signal (1) (LE5 w/M82)
47 D-GN 1433 Clutch Start Switch Signal (LE5 w/MA5)
48 D-GN/WH 428 EVAP Canister Purge Solenoid Control (LE5)
49 D-GN 335 Low Speed Cooling Fan Relay Control
50-52 - - Not Used
53 TN/BK 2500 High Speed GMLAN Serial Data (+) (1)
54 - - Not Used
55 YE 410 Engine Coolant Temperature Sensor Signal (LE5)
56 - - Not Used
57 OG/BK 380 A/C Refrigerant Pressure Sensor Signal (C60 w/LE5)
58 - - Not Used
59 L-GN 432 Manifold Absolute Pressure Sensor Signal (LE5)
60-64 - - Not Used
65 TN/BK 231 Oil Pressure Switch Signal (LE5)
66 YE 400 Vehicle Speed Sensor Signal (LE5 w/MA5)
67 PU 401 Vehicle Speed Sensor Low Reference (LE5 w/MA5)
68-73 - - 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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