Electronic Control Unit (Ecu) Operation

1986 Saab 9000 StandardSECTION Electronic Control Unit (Ecu) Operation

The ECU is a microprocessor based computer that receives and evaluates readings from various sensors. The control unit then produces a signal that is sent to each injector to ensure the correct amount of fuel delivery for all operating conditions. Located in the right kick panel, it also controls the Automatic Idle Control system.

CAUTION: ECU will be damaged if subjected to temperatures above 176°F (80°C). Always remove ECU from vehicle when welding any part(s) of the vehicle. Do not connect or disconnect ECU unit when ignition is turned on.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.