1993 Saab 900 CommemorativeFACTORY OEM SERVICE PROCEDURE

Transmission Range Switch (Except 9000 Series Turbo)

  1. IAC valve receives a signal from transmission range switch. "D" (Drive) light on trip computer will glow if system is working properly.
  2. If system is not working properly, check fuse No. 13 on 900 Series, or fuse No. 9 on 9000 Series.
  3. With ignition on, check for battery voltage at White wire at switch, located at base of transmission selector lever. If battery voltage does not exist, repair White wire back to fuse panel.
  4. Set transmission selector lever to Park and Neutral positions in turn. With ignition on, no voltage should exist at Orange wire on switch with lever in either position. With lever in all other positions, battery voltage should exist at Orange wire. If voltage is as specified, go to next step. Replace switch if it does not meet specification.
  5. Connect DVOM to pin No. 30 (Orange wire) at fuel injection ECM. Battery voltage should exist with switch in all positions but Park or Neutral. Repair Orange wire between switch and ECM if battery voltage does not exist.
Factory Service Tools

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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.