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Home >> Chevrolet >> 1993 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - V6 >> Self-Diagnostic Tests >> Code 26, Quad-Driver Circuit 3.8L >> Diagnostic Aids

Diagnostic Aids

Monitor voltage of each terminal while moving related harness connectors, including PCM harness. If fault is induced, voltage will change. This may help locate intermittent problems. If code reappears with no apparent problems, replace PCM.

Fig 1: CODE 26, Schematic, Quad Driver Circuit (3.8L)
G93J76363
Fig 2: CODE 26, Flowchart, Quad Driver Circuit (3.8L)(1 of 2)
G93A76364
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