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Home >> Mercedes Benz >> 1986 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> Cis-E System >> Diagnostic Testing >> Test 7 >> Testing TD Signal
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Testing TD Signal

  1. Disconnect CIS-E control unit plug. Start engine. Check voltage between terminal No. 25 (control unit plug) and ground. Voltage should be 6-12 volts. If not okay, go to step 2). If okay, test is complete.
  2. Unplug fuel pump relay. Check wire between terminal No. 10 (relay plug) and terminal No. 25 on CIS-E control unit plug for continuity. Resistance should be zero ohms. If not okay, repair interruption. If okay, check wires to ignition control module for continuity.
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