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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 92 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 3.6L - INTRODUCTION (2 OF 2))DESCRIPTION AND OPERATIONELECTRONIC IGNITION (EI) SYSTEM DESCRIPTIONENGINE CONTROL MODULE (ECM)
2008 Pontiac Grand Prix Base

Engine Control Module (ECM)

2008 Pontiac Grand Prix BaseSECTION Engine Control Module (ECM)
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.

The engine control module (ECM) controls all ignition system functions, and constantly corrects the spark timing. The ECM monitors information from various sensor inputs that include the following components:

  • The throttle position (TP) sensor
  • The engine coolant temperature (ECT) sensor
  • The mass air flow (MAF) sensor
  • The intake air temperature (IAT) sensor
  • The vehicle speed sensor (VSS)
  • The transmission gear position or range information sensors
  • The engine knock sensors (KS)
  • Ambient pressure sensor (BARO)
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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.