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Home >> Mercedes Benz >> 1991 >> 560SEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle Speed Stabilization (Auto. Trans. Engaged)
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Idle Speed Stabilization (Auto. Trans. Engaged)

  1. Set parking brake. Run engine at idle and warm up to operating temperature. Engine should idle between 570-670 RPM in drive. If idle speed is correct, test is complete. If engine idle is not correct, go to next step.
  2. Using voltmeter, test voltage input by backprobing CIS-E connector terminal No. 16 for 420SEL and 560 series and terminal No. 28 for 190E and 300 series. With shifter in "P" or "N", reading should be 12 volts. With shifter in "D", reading should drop below battery voltage. If reading is incorrect on either test, repair short in circuit or repair or replace the selector switch. If reading is correct, test is complete.
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