LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saab >> 1991 >> 900 SPG >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls >> Dis Ignition Control Unit >> 9000 Series Power Circuit
April 5, 2026: LEMON Manuals is launched! Read the announcement.

9000 Series Power Circuit

  1. Check for battery voltage between ECU terminal No. 22 (Red wire) and ground. If battery voltage is not present, check fuse No. 23 on power distribution panel behind glove box. If fuse is okay, repair Red wire to fuse No. 23, or Red wire from fuse panel to main distribution terminal on battery bracket.
  2. Turn ignition on. Check for battery voltage between ECU terminal No. 35 (Green/Red wire) and ground. If battery voltage is not present, check for open Green/Red wire from ECU terminal No. 35 to main relay terminal No. 3. If wire is okay, check main relay. See MAIN RELAY  .
  3. Turn ignition on. Check for battery voltage between ECU terminal No. 21 (Green/White wire) and ground. If battery voltage is not present, check fuse No. 9 on fuse panel in engine compartment. If fuse is okay, check for open Green/White wire from ECU to fuse panel, open Green/White wire from ignition switch to fuse panel, or defective ignition switch.
scientia non olet · About LEMON Manuals