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Home >> Mercedes Benz >> 1987 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> BOSCH Cis-E System >> Component Testing >> Deceleration Shutoff
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Deceleration Shutoff

  1. Connect on-off ratio tester to diagnostic socket. With engine at idle and operating temperature, tester needle should oscillate. If okay, test is complete. If not okay, go to step 2).
  2. Drive vehicle on road test. With engine above 2500 RPM, place shift lever in position "2" and decelerate. When vehicle decelerates (throttle valve closed) the on-off ratio should jump to about 80% and should restart the fuel injection below 1300 RPM (tester needle should oscillate). If not okay, check idle speed contact on throttle valve switch and TD signal. Go to step 3). If okay, test is complete.
  3. Test speed signal (speedometer). Check wire between idle speed control unit plug and electronic speedometer for continuity. Resistance should be zero ohms. If not okay, repair interruption. If okay, test is complete.
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