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Home >> Mercedes Benz >> 1990 >> 560SEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Altitude Correction Capsule Test
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Altitude Correction Capsule Test

  1. Disconnect plug on altitude correction capsule (located near CIS-E under dash on passenger's side). Turn ignition on. Check voltage between terminal Nos. 2 and 3. Voltage should be about 5 volts. If voltage is not about 5 volts, check power supply and ground according to wiring diagram. If okay, go to next step.
  2. Turn ignition off. Check wire between altitude correction capsule plug (terminal No. 1) to CIS-E control unit plug (terminal No. 11) for continuity. Resistance should be about zero ohms. If resistance is not about zero ohms, repair open circuit. If okay, go to next step.
  3. Start engine and run at idle speed and at operating temperature. With On-Off Ratio Tester (KDJE-P 600) connected at test socket on left side of engine compartment, the on-off ratio needle should oscillate. If needle does not oscillate, replace altitude correction capsule. If okay, test is complete.
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