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Home >> Dodge and Ram >> 1982 >> Rampage Base, Standard Trans, Trans Mfr CD A412 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electronic Fuel Control >> Testing >> Electronic Fuel Control System Tests >> Air Switching System Diagnosis (Vacuum Supply)
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Air Switching System Diagnosis (Vacuum Supply)

  1. Remove vacuum hose for air switching/diverter valve and connect a vacuum gauge to hose. Set parking brake. Start engine and observe gauge reading.
  2. On a cold engine, engine vacuum should be present until engine coolant temperature reaches 125°F (2.2L engine) or 150°F (1.7L engine). When temperature is reached, vacuum should drop to 0. If no vacuum is present on gauge, check the vacuum supply and Coolant Controlled Engine Vacuum Switch (CCEVS).
  3. On a warm engine, no vacuum should be present. If vacuum is present, check Coolant Controlled Engine Vacuum Switch (CCEVS).
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