1994 Saturn SW1 AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Aids

PCM will hold EST low if RPM reference is not received from ignition module. If Code 41 is set with Code 42, use CODES 41 & 42 SIMULTANEOUS chart.

Fig 1: Code 41 Schematic (Saturn) EST Circuit Open Or Shorted
G92D04636
Factory Service Tools

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Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

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

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