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Home >> Mazda >> 2000 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0402: Excessive EGR Flow Detected >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. If any other DTCs are present, diagnose and repair first. If no other DTCs are present, go to next step.
  3. Turn ignition off. Remove EGR valve. If EGR valve gasket is okay, go to next step. If EGR valve gasket is damaged or missing, replace gasket. Go to next step.
  4. Clear DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Perform DRIVE MODE No. 1. See DRIVE CYCLE PROCEDURE under SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Using scan tool, check RFC FLAG PID. If PID is ON, go to next step. If PID is OFF, clear codes and repeat DRIVE MODE No. 1.
  5. Perform DRIVE MODE No. 2. Using scan tool, check ON-BOARD READINESS TEST. If EGR system has been monitored, go to next step. If EGR system has not been monitored, repeat DRIVE MODE No. 2.
  6. Reconnect all connectors. Using scan tool, check diagnostic monitoring test results. If test No. 10:41:00 is within specification, go to next step. If test No. 10:41:00 is out of specification, replace PCM and go to next step.
  7. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Conduct drive cycle mode. See DRIVE CYCLE PROCEDURE under SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Verify if any DTCs are stored or are present in PENDING TROUBLE CODE, DTC diagnostic monitoring test results. If no DTCs are present, testing is complete. If any DTCs are present, go to applicable test and repair.
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