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Home >> Saab >> 1993 >> 900 Commemorative >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls (9000 Series Turbo) >> Electronic Control Module (ECM) >> Ground Circuit
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Ground Circuit

  1. Turn ignition off. Locate ECM in engine compartment, between front and rear firewall partitions, on left side. Connect negative lead of ohmmeter to ground. Backprobe ECM terminals No. 24 (Black/White wire), No. 25 (Black/White wire), No. 46 (Black wire), and No. 47 (Black wire). Resistance should be zero ohms for each wire. If not, repair open to ground.
  2. Connect negative lead of DVOM to a good ground. Backprobe each terminal specified in step 1). With vehicle running, DVOM should indicate less than one volt. If voltage is higher than one volt, check for open, corrosion, or loose connection on appropriate ground lead.
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