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Home >> GMC >> 1992 >> Forward Control 6.2 J, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Miscellaneous ECM Controls >> Chart C-10, A/C Clutch Control Diagnosis (A/T) (2 Of 2) 4.3L Turbo PFI >> Notes

Chart C-10, A/C Clutch Control Diagnosis (A/T) (2 Of 2) 4.3L Turbo PFI: Notes

NOTE: Test numbers refer to test numbers on diagnostic charts.
  1. 3)  Checks for faulty cycling switch. Solenoids and relays are turned on and off by the ECM, using "drivers". Each driver is a part of a group of 4, called quad-drivers. Failure of one driver can damage any other driver in the set. Solenoid and relay coil resistance should be greater than 20 ohms.
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