LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> American Motors >> 1980 >> AMX Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Computerized Emission Control (CEC) System >> Diagnosis >> Closed Loop Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Closed Loop Check

  1. With no vacuum applied to yellow vacuum switch, slowly increase engine speed to 2000 RPM and maintain speed while observing metering pins. Metering pins should start moving and continue in incremental steps.
  2. If metering pins do not move at all, perform Open Loop-3 Test sequence. If metering pins move fully to either end and remain stationary, perform Closed Loop Test sequence. If system operates properly, CEC is functioning normally; turn engine "OFF", reconnect all vacuum hoses and reinstall air cleaner cover.
scientia non olet · About LEMON Manuals