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Home >> Mercedes Benz >> 1990 >> 560SEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Speed Stabilization (A/C Compressor Engaged) Test >> Idle Speed Stabilization (A/T Engaged) Test
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Idle Speed Stabilization (A/T Engaged) Test

  1. Set parking brake. Run engine at idle and warm up to operating temperature. Engine should idle between 570-670 RPM. If correct, test is complete. If engine idle is not correct, go to next step.
  2. Using voltmeter, test input at ECU (terminal No. 16 to battery positive). 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. If reading is correct, test is complete.
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