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Home >> Mercedes Benz >> 1990 >> 560SEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle & Full Load Contact Test
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Idle & Full Load Contact Test

  1. Connect On-Off Ratio Tester (KDJE-P 600) to diagnostic socket and turn on ignition. On-off ratio should be about 70%. Move airflow sensor plate about .80" (20 mm). On-off ratio should be about 10%. Go to next step.
  2. If reading is 70%, throttle valve contact does not close or there is an interruption in wire to idle speed contact. Close airflow sensor plate. On-off ratio should be 40%. Go to next step.
  3. Open throttle valve fully. On-off ratio should be 20%. If ratio is not correct, replace full load contact. If okay, test is complete.
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