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Home >> GMC >> 1989 >> Magnavan 6.2 J, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> 6.2L CEC Testing >> Diagnosis & Testing >> Code 24 - Vehicle Speed Sensor (VSS) Circuit >> Diagnostic Aids

Diagnostic Aids

With drive wheels turning, "SCAN" tester reading should closely match with speedometer reading.

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