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Home >> Mazda >> 2002 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0402: Exhaust Gas RECIRCULATION System Excessive Flow Detected >> Diagnostic Procedure

Diagnostic Procedure

  1. Turn ignition off. Connect New Generation Star (NGS) tester or equivalent to OBD-II Data Link Connector-2 (DLC-2). See Figure. Turn ignition on. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check for service bulletins and/or other line of repair information related to this DTC. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  5. If repair information is not available, go to next step.
  2. Leave ignition on. Monitor for other DTCs. If malfunction code recordedis P0402, go to next step. If malfunction code recordedis different that P0402, follow appropriate DTC diagnostic procedure.
  3. Turn ignition off. Remove EGR valve, inspect EGR valve gasket for condition and proper installation. If EGR valve is in good condition and properly installed, go to next step. If EGR valve gasket is faulty or not install properly, repair or replace components as necessary. After repair, go to step  5.
  4. Using NGS tester or equivalent, run MODE 1 and 2. See DRIVE MODES  under SELF-DIAGNOSTIC SYSTEM. Check EGR System Monitor completion status using On-Bord Readiness Test function. If EGR system has been monitored, go to next step. If EGR system has not been monitored, repeat this step procedure.
  5. Return vehicle to original condition. Using NGS tester or equivalent, clear DTCs from PCM memory. Access DIAGNOSTIC MONITORING TEST RESULTS of generic OBD-II functions and verify TEST ID 10:41:00 value is within specification, if value is within specification, monitor for DTCs. If same DTC P0401 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. If any other DTC is present, follow appropriate DTC diagnostic procedure.
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