1990 Isuzu Impulse AutomaticFACTORY OEM SERVICE PROCEDURE

System Operation Check

Turn ignition switch to the ON position. SIR indicator light should flash 7-9 times and then turn off. This indicates SIR system is functioning properly. SIR system is malfunctioning and requires repair:

  • If SIR indicator light does not illuminate as described.
  • If when engine is cranking, SIR indicator light does not remain on steady.
  • If after cranking and engine start, SIR indicator light does not blink 7-9 times and then go out.
  • If after cranking and engine start, SIR indicator light begins to flash a code 12.
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:

  • 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.

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