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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 CKT DIAGNOSIS 2.5/2.8L (2 Of 2) >> Diagnostic Aids

Diagnostic Aids

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

Fig 1: A/C Clutch Circuit (2.5L & 2.8L), Schematic
G92B22161Courtesy of GENERAL MOTORS CORP.
Fig 2: A/C Clutch Circuit (2.5L & 2.8L), Flow Chart, (2 Of 2)
G92D22163Courtesy of GENERAL MOTORS CORP.
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