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Home >> Mitsubishi >> 1986 >> Montero Base >> Repair and Diagnosis >> Engine Performance >> System >> Deceleration Control System >> System Testing >> Air Switching Valve System
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Air Switching Valve System

  1. Run engine at idle. Disconnect solenoid valve connector to disable solenoid valve. Manifold vacuum will act on air switching valve, causing it to open. If idle drops excessively or engine stalls, air switching valve and solenoid valve are okay.
  2. If idle speed does not change, check condition of air switching and solenoid valves. Also check vacuum passage for clogging.
  3. With engine idling, battery voltage should be measured at solenoid connector. If no voltage is present, electrical wiring or engine speed sensor is defective.
  4. Increase engine speed to 1500 RPM. Verify voltage is present at solenoid valve connector. If not, engine speed sensor is defective.
  5. Increase engine speed to 2500 RPM. Verify no voltage is present at solenoid valve connector. If it is, engine speed sensor is defective.
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