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Tuesday, March 24, 2009

Electronic Engine Controls and Sensors | Testing Procedures

All Sequential Fuel Injection (SFI) systems use the EEC system. The heart of the EEC system is a microprocessor called the Powertrain Control Module (PCM). The PCM receives data from a number of sensors and other electronic components (switches, relays, etc.). Based on information received and information programmed in the PCM's memory, it generates output signals to control various relays, solenoids and other actuators. The PCM in the EEC system has calibration modules located inside the assembly that contain calibration specifications for optimizing emissions, fuel economy and driveability. The calibration module is called a PROM. Electronic Engine Controls and Sensor Testing Procedures Powertrain Control Module (PCM) Throttle Position (TP) sensor Mass Air Flow (MAF) sensor Intake Air Temperature (IAT) sensor Idle Air Control (IAC) valve Engine Coolant Temperature (ECT) sensor Heated Oxygen Sensor (HO2S) Camshaft Position (CMP) sensor Knock Sensor (KS) Vehicle Speed Sensor (VSS) Crankshaft Position (CKP) sensor

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