FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM
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Car repair manuals for everyone.
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Chevy Truck
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1987
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Suburban 1/2 Ton 2WD V8-305 5.0L
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Cranking Signal
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Description and Operation
Cranking Signal: Description and Operation
This signal is used to inform the ECM that the engine is cranking. The ECM uses this information to tell when the engine is in the cranking mode.