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Home >> GMC >> 1988 >> Safari Van M L4-151 2.5L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Positions >> RPM - Engine Speed
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RPM - Engine Speed


Displays engine RPM as transmitted to ECM from reference sensor. Can be used to detect extra reference pulses caused by electrical interference in reference circuit.

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