1999 Saturn SL2 Automatic, MP6FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedures

  1. Start and idle engine. Connect scan tool. Using scan tool, observe KS active noise counter while accelerating engine. If noise channel value increases with RPM, problem is intermittent. See DIAGNOSTIC AIDS . If noise channel value does not increase with RPM, go to next step.
  2. Turn engine off. Disconnect KS harness connector. Turn ignition on, with engine off. Connect test light battery voltage. Using test light, momentarily touch and release KS harness connector terminal. Repeat several times while observing noise channel on scan tool. If noise channel value changes, check for terminal tightness at sensor or faulty sensor. If noise channel value does not change, go to next step.
  3. If test light illuminates when probing KS harness connector terminal, go to next step. If test light does not illuminate when probing KS harness connector terminal, check for open in circuit, terminal tightness at PCM or faulty PCM.
  4. Turn ignition off. Disconnect PCM harness connector J3. Turn ignition on. If test light now illuminates, repair short to ground in KS circuit. If test light does not illuminate, replace PCM.
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.

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