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Home >> Saab >> 1993 >> 900 Commemorative >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls (Except 9000 Series Turbo) >> Fuel Injection ECM >> Power Circuits
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Power Circuits

  1. Check for battery voltage between ECM terminal No. 4 (Red wire) and ground. If battery voltage does not exist, repair Red wire to main distribution terminal on battery bracket.
  2. Turn ignition on. Check for battery voltage between ECM terminal No. 35 (Green/White wire) and ground. If battery voltage does not exist, check fuse No. 14 on 900 Series, or fuse No. 13 on 9000 Series. Fuse panel is located in left side of engine compartment on 900 Series, and behind panel inside glove compartment on 9000 Series. If fuse is okay, check for open Green/White wire between fuse box and ECM terminal No. 35, or check for a defective ignition switch.
  3. Turn ignition on. Check for battery voltage between ECM terminal No. 9 and ground. If battery voltage does not exist, check for open wire from ECM terminal No. 9 to main relay terminal No 2. On 900 Series, wire is Brown/White to fuel injector terminal block and Blue/Red to main relay. On 9000 Series, wire is Gray/White to terminal block and Blue/Red to main relay. If wire is okay, see MAIN RELAY under RELAYS  under MODULES, RELAYS & SOLENOIDS.
  4. Connect DVOM between ground and ECM terminal No. 1 (Blue wire). Turn ignition switch to START position. Voltage should be more than 6.5 volts only when ignition switch is in START position.
  5. If voltage does not exist, check for open Blue wire between terminal No. 1 of fuel injection ECM unit and terminal No. 29 of ignition ECM.
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