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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 127 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS (3.6L)
2008 Pontiac Grand Prix Base
Scan Tool Output Controls (3.6L)
2008 Pontiac Grand Prix BaseSECTION Scan Tool Output Controls (3.6L)
WARNING: This page is about a different car, the 2007 Buick LaCrosse and 2007 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Engine Control Module (ECM)
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Fan Relay 1 | Special Functions/Output Control/Cooling Fan | The scan tool displays a Commanded State of None, OFF or ON. This allows you to communicate with the ECM and activate or deactivate the cooling fan 1 relay, manually turning both cooling fans ON and OFF at low speed. |
| Fan Relays 2 and 3 | Special Functions/Output Control/Cooling Fan | The scan tool displays a commanded state of None, OFF or ON. This allows you to communicate with the ECM to activate or deactivate the cooling fan 2 relay and the cooling fan 3 relay. This commands one of the cooling fans ON at high speed. |
| Fan Relays 1, 2 and 3 | Special Functions/Output Control/Cooling Fan | The scan tool displays a Commanded State of None, OFF or ON. This allows you to communicate with the ECM to activate or deactivate the cooling fan 1 relay, manually turning the low speed fans On. After a 3 second delay the ECM will activate the cooling fan 2 relay and the cooling fan 3 relay. This commands both cooling fans ON at high speed. |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.