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Home >> Mercedes Benz >> 1988 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> Cis-E System >> Component Testing >> Electrical Components >> Idle Speed Stabilization (Automatic Transmission Engaged)
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Idle Speed Stabilization (Automatic Transmission Engaged)

  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 not correct, go to next step.
  2. Using multimeter, test input at ECU (terminal No. 16 to battery positive). With shifter in position "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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