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Home >> Mercedes Benz >> 1991 >> 300E Base, 2.6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle Speed Stabilization (A/C Compressor Engaged - 190E 2.6L & 300 Series)

Idle Speed Stabilization (A/C Compressor Engaged - 190E 2.6L & 300 Series)

  1. Set parking brake. Run engine at idle and warm to operating temperature. Engine should idle between 670-770 RPM. If correct, test is complete. If idle speed is not correct, go to next step.
  2. Using voltmeter, test input voltage at CIS-E terminal No. 45. Readings should be 12 volts with the A/C compressor on and zero volts with the A/C compressor off. If reading is incorrect on either test, repair short in circuit or test MAS unit. If reading is correct, test is complete.
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