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GMC
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1990
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Forward Control 6.2 J, Automatic, 400/M40
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Engine Controls - Tests W/Codes - Diesel
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Diagnostic Charts
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Code 24, Vehicle Speed Sensor Circuit
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Diagnostic Aids
Diagnostic Aids
With drive wheels turning, SCAN tester and speedometer reading should be close.
Fig 1: Code 24: Circuit Diagram VSS Circuit
Fig 2: Code 24: Flow Chart VSS Circuit