LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Plymouth >> 1983 >> Sapporo Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Deceleration Control System >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Deceleration Control System: Testing

  1. Run engine at idle. Disconnect solenoid valve connector to disable solenoid valve. Manifold vacuum will act on air switching valve, causing valve 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 vacuum passage for clogging and check condition of air switching valve or solenoid valve.
  3. With engine idling, battery voltage should be measured at solenoid connector. If voltage is not present, electrical wiring or engine speed sensor is defective.
  4. Increase engine speed to 1500 RPM. Check to make sure voltage is present at solenoid valve connector. If not, engine speed sensor is defective.
  5. Increase engine speed to 2500 RPM. Check to be sure no voltage is present at solenoid valve connector. If it is, engine speed sensor is defective.
scientia non olet · About LEMON Manuals