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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Diagnostic Flow Charts (Cars) >> Code 39, TCC Circuit 3.3L With 3T40 Transaxle >> Diagnostic Aids

Diagnostic Aids

A poor connection can cause an intermittent Code 39. Using a digital volt-ohmmeter connected to the circuit, move the related wiring and connectors. An intermittent condition would cause a voltage reading change.

Fig 1: Code 39, TCC Circuit Diagram (3.3L W/3T40 Transaxle)
G91B07337Courtesy of GENERAL MOTORS CORP.
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