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Home >> Mazda >> 1993 >> MX-3 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - EFI >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION (EGR - MX-3 DOHC, MX-6, RX7, 626 & 929) >> System Check (MX-3 DOHC, MX-6 2.5L, 626 2.5L & 929)

System Check (MX-3 DOHC, MX-6 2.5L, 626 2.5L & 929)

  1. Connect Engine Signal Monitor (49-9200-162) and Test Harness (49 G018 903) to ECU. Start engine. Increase engine speed, and check voltage at ECU terminals 3O and 3P while engine is cold. See PIN VOLTAGE CHART S article. Voltage should be 12 volts.
  2. Warm engine to operating temperature, and operate it at idle. Increase engine speed, and ensure engine signal monitor Green and Red lights flash at ECU terminals 3O and 3P.
  3. Disconnect EGR solenoid valve (vacuum side) electrical connector. Apply 12 volts and a ground to solenoid valve. Ensure engine runs rough or stalls at idle. Test EGR components as necessary. See Figure or Figure .
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