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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 878 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L And 6.2L - Introduction (2 Of 2)) >> Description and Operation >> Electronic Ignition (EI) System Description >> Modes of Operation

Modes of Operation

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

There is one normal mode of operation, with the spark under engine control module (ECM) control. If the crankshaft position (CKP) pulses are lost, the engine will not run. The loss of a camshaft position (CMP) signal may result in a longer crank time, since the ECM cannot determine which stroke the pistons are on. Diagnostic trouble codes are available to accurately diagnose the ignition system with a scan tool.

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