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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (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 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1992 Pontiac Trans Sport, 1992 Oldsmobile Silhouette, 1992 Oldsmobile Bravada, 1992 GMC Yukon, and 1992 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.

Check resistance of each ECM controlled relay or solenoid before replacing ECM. See CONTROL UNIT  under COMPUTERIZED ENGINE CONTROLS. Replace any relay or solenoid that measures less than 20 ohms.

Fig 1: A/C Clutch Circuit Schematic (4.3L Turbo PFI)
G92E22164Courtesy of GENERAL MOTORS CORP.
Fig 2: A/C Clutch Circuit Flow Chart, (4.3L Turbo PFI) (2 Of 2)
G92G22166Courtesy of GENERAL MOTORS CORP.
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