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Home >> Pontiac >> 2002 >> Aztek FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 239 (Engine Controls - Theory & Operation - 2.2L) >> Computerized Engine Controls >> Input Devices >> RPM Reference Signal
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RPM Reference Signal

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The RPM is monitored by PCM through tach/pulse signals produced by either the Ignition Control Module (ICM) or Crankshaft Position (CKP) sensor. These signals are used by PCM for determining control of timing, fuel delivery, EGR function and idle speed.

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