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Home >> Audi >> 1990 >> 100 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Control (Cis Digital Control) >> Cold Engine Warm-Up Enrichment
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Cold Engine Warm-Up Enrichment

  1. Using Adapter Cable (US 1112), connect Green test lead to OXS system test connector, located near fuel filter, (Blue/Black wire). Connect Dwell Meter (VW 1367) to vehicle. Set the "%" button on dwell meter.
  2. Ensure engine is below 68°F (20°C). Start engine. Duty cycle should be at least 80%. After 30-60 seconds, duty cycle should gradually drop. If not, check coolant sensor and wiring circuits to coolant sensor. If coolant sensor and wiring circuits are okay, replace ECU.
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