Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Control Module (ECM) X3 (LS4)
2008 Pontiac Grand Prix BaseSECTION Engine Control Module (ECM) X3 (LS4)
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Engine Control Module (ECM) X3 (LS4)
| Pin | Wire | Circuit | Function |
|---|---|---|---|
| 1-6 | - | - | Not Used |
| 7 | 0.35 RD | 225 | Generator Turn On Signal |
| 8-9 | - | - | Not Used |
| 10 | 0.5 TN | 5496 | Cylinder Shutoff Solenoid Control 6 |
| 11 | 0.5 D-BU | 5491 | Cylinder Shutoff Solenoid Control 1 |
| 12 | 0.35 TN/BK | 464 | Delivered Torque Signal |
| 13-16 | - | - | Not Used |
| 17 | 0.35 OG/BK | 463 | Requested Torque Signal |
| 18-20 | - | - | Not Used |
| 21 | 0.35 BK | 2751 | Low Reference |
| 22 | - | - | Not Used |
| 23 | 0.5 OG/BK | 469 | Low Reference |
| 24-28 | - | - | Not Used |
| 29 | 0.35 GY | 23 | Generator Field Duty Cycle Signal |
| 30-32 | - | - | Not Used |
| 33 | 0.5 TN | 2501 | High-Speed GMLAN Serial Data Bus (-) |
| 34 | - | - | Not Used |
| 35 | 0.35 BK | 2761 | Low Reference |
| 36 | - | - | Not Used |
| 37 | 0.35 GY | 2700 | 5-Volt Reference 1 |
| 38 | - | - | Not Used |
| 39 | 0.5 GY | 2704 | 5-Volt Reference 1 |
| 40-44 | - | - | Not Used |
| 45 | - | - | Not Used |
| 46 | 0.35 OG/BK | 1786 | Park/Neutral Signal |
| 47 | - | - | Not Used |
| 48 | 0.5 D-GN/WH | 428 | EVAP Canister Purge Solenoid Control |
| 49 | 0.35 D-GN | 335 | Low Speed Cooling Fan Relay Control |
| 50-52 | - | - | Not Used |
| 53 | 0.5 TN/WH | 2500 | High-Speed GMLAN Serial Data Bus (+) |
| 54 | - | - | Not Used |
| 55 | 0.35 YE | 410 | ECT Sensor Signal |
| 56 | - | - | Not Used |
| 57 | 0.35 RD/BK | 380 | A/C Refrigerant Pressure Sensor Signal |
| 58 | - | - | Not Used |
| 59 | 0.5 L-GN | 432 | MAP Sensor Signal |
| 60-65 | - | - | Not Used |
| 66 | 0.5 RD | 381 | Vehicle Speed Signal |
| 67 | - | - | Not Used |
| 68 | 0.5 WH | 5497 | Cylinder Shutoff Solenoid Control 7 |
| 69 | 0.5 OG | 5494 | Cylinder Shutoff Solenoid Control 3 |
| 70-73 | - | - | Not Used |
Connector Part Information
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Terminal Part Information
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RENDER: 1.0x
NO RELATED
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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.