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Home >> Mercedes Benz >> 1990 >> 560SEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> TD Signal Test
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TD Signal Test

  1. Disconnect CIS-E control unit plug (located on left side of engine compartment). Start engine. Check voltage between terminal No. 25 (control unit plug) and ground. Voltage should be 6-12 volts. If not 6-12 volts, go to next step. 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 resistance is not about zero ohms, repair open circuit. If okay, check wires to ignition control module for continuity.
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