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Home >> Cadillac >> 1994 >> Fleetwood Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> ECM/Pcm Code Charts >> Code 78, Secondary Cooling Fan Driver >> Diagnostic Aids
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Diagnostic Aids

Check related harness connectors, including PCM harness. Check for damaged or pushed out terminals.

Fig 1: Code 78 Schematic (Fleetwood) Secondary Cooling Fan Driver
G94A37234
Fig 2: Code 78 Flow Chart (Fleetwood) Secondary Cooling Fan Driver
G94C35164
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