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Home >> Volkswagen >> 1993 >> Cabriolet Base, 1.8 C, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle Stabilization Control >> Cabriolet 1.8L Digifant II (Federal)
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Cabriolet 1.8L Digifant II (Federal)

  1. Turn ignition on. Ensure idle stabilizer valve vibrates or hums. If valve vibrates or hums, go to step 3). If valve does not vibrate or hum, disconnect idle stabilizer valve. Measure idle stabilizer valve resistance. Resistance must be 2-10 ohms. If resistance is incorrect, replace valve.
  2. If valve resistance is correct, check idle stabilization control wiring harness for an open circuit. For more information, see the appropriate PIN VOLTAGE CHARTS article in this section. If wiring harness is okay, replace Electronic Control Module (ECM).
  3. Disconnect idle stabilizer valve wiring harness. Install Test Harness (VAG 1315A/2) between valve and wiring harness connector. Connect Digital Volt-Ohmmeter (DVOM) to test harness terminals.
  4. Start engine and allow it to idle for one minute. Increase engine speed, at least 3 times, to 3000 RPM. Allow engine to return to idle and measure idle stabilization control current. Current must fluctuate between 390-450 milliamps.
  5. Disconnect Blue engine coolant temperature sensor. Current must be between 390-450 milliamps without fluctuating. If control current is not as specified, replace ECM.
NOTE: Idle stabilization control current may vary between 400-1000 milliamps depending on engine load (cold engine, A/C on, power steering at full lock, or electrical components on).
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