Diagnostic Aids

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

Courtesy of GENERAL MOTORS CORP.

Fig 2: A/C Clutch Circuit (2.5L & 2.8L), Flow Chart, (2 Of 2)

Courtesy of GENERAL MOTORS CORP.