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Home >> Mazda >> 1997 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> DTC P0400 - EGR Flow Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Determine if any other EGR related DTCs are present. Diagnose and repair those DTCs first. If no other EGR related DTCs are present, go to next step.
  2. Inspect the EGR valve position sensor. See appropriate SYSTEM/COMPONENT TESTS article in this section. Replace as needed. If EGR valve position sensor is okay, go to next step.
  3. Inspect all EGR vent and vacuum hoses. Repair or replace as needed. If all hoses are okay, go to next step.
  4. Inspect the EGR boost sensor. See appropriate SYSTEM/COMPONENT TESTS article in this section. Replace as needed. If EGR boost sensor is okay, go to next step.
  5. Erase DTC. See CLEARING CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC is present, replace ECM. If DTC is not present, intermittent poor harness connection may have caused DTC to originally set.
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