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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls [Self-Diagnostics 3.0L]) >> Diagnostic Tests >> DTC P0402: EGR Flow - Excessive Detected >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Inspect For Other DTCs -  Turn ignition off, then on (engine off). If no other DTCs have been stored, go to next step. If other DTCs have been stored, diagnose those DTCs first. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  4. Inspect EGR Valve Gasket Installation -  Turn ignition off. Remove EGR valve. If EGR valve gasket installation is okay, go to next step. If EGR gasket installation is faulty, install EGR gasket correctly. After repair, go to step  6.
  5. Inspect EGR Valve Gasket -  Turn ignition off. Remove EGR valve. If EGR valve gasket is okay, go to next step. If EGR valve gasket is faulty or improperly installed, replace EGR gasket. After repair, go to next step.
  6. Monitor EGR System By Drive Mode 1 -  Clear DTC from PCM memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Perform MODE 1 - PCM ADAPTIVE MEMORY PRODUCE DRIVE MODE . Stop vehicle and access ON BOARD READINESS TEST to inspect DRIVE MODE completion status. Verify FUEL_EVAL PID status. If FUEL_EVAL PID changed to YES, go to next step. If FUEL_EVAL PID did not change to YES, retry this step.
  7. Monitor EGR System By Drive Mode 2 -  Perform MODE 2 - EGR SYSTEM REPAIR VERIFICATION DRIVE MODE . Stop vehicle and access ON BOARD READINESS TEST to inspect DRIVE MODE completion status. Verify FUEL_EVAL PID status. If FUEL_EVAL PID changed to YES, go to next step. If FUEL_EVAL PID did not change to YES, retry this step.
  8. Verify Trouble Shooting Of DTC P0402 Is Completed -  Make sure to reconnect all disconnected connectors. Access DIAGNOSTIC MONITORING TEST RESULTS. Verify TEST #10:41:00 (EGR pressure variation) value. If value is within specification, go to next step. If value is not within specification, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  9. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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