LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P2401: Evaporative Emission System Leak Detection Pump Control Circuit - Low Input >> 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. Verify Related Pending Code Or Stored DTCs -  Turn ignition off, then on (engine off). Verify related PENDING CODE or stored DTCs. If no other DTCs are present, go to next step. If DTC P2405 is present, go to DTC P2405: EVAPORATIVE EMISSION SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT - LOW INPUT .
  4. Inspect EVAP System Leak Detection Pump Connector For Poor Connection -  Turn ignition off. Disconnect EVAP system leak detection pump 4-pin harness connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). If malfunctions are not present, go to next step. If any malfunctions are present, repair or replace terminal. After repair, go to step  10.
  5. Inspect EVAP System Leak Detection Pump Motor Circuit For Open Circuit -  Disconnect main relay. Check for continuity in White wire between EVAP system leak detection pump 4-pin harness connector terminal "A" and main relay harness connector terminal "E". See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in White wire between EVAP system leak detection pump 4-pin harness connector terminal "A" and main relay harness connector terminal "E" or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
    Fig 1: Identifying EVAP System Leak Detection Pump Circuits & Harness Connector Terminals
    G00221528Courtesy of MAZDA MOTORS CORP.
  6. Inspect PCM Connector For Poor Connection -  Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If malfunction is not present, go to next step. If any malfunction is present, repair or replace suspected terminal. After repair, go to step  10.
  7. Inspect EVAP System Leak Detection Pump Motor Circuit For Short To Ground -  Check for continuity between EVAP system leak detection pump 4-pin harness connector terminal "D" (Pink wire) and body ground. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground in Pink wire between EVAP system leak detection pump 4-pin harness connector terminal "D" and PCM 27-pin harness connector terminal "3Y". After repair, go to step  10.
  8. Inspect EVAP System Leak Detection Pump Motor Circuit For Open Circuit -  Check for continuity in Pink wire between EVAP system leak detection pump 4-pin harness connector terminal "D" and PCM 27-pin harness connector terminal "3Y". See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in Pink wire between EVAP system leak detection pump 4-pin harness connector terminal "D" and PCM 27-pin harness connector terminal "3Y" or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
  9. Inspect EVAP System Leak Detection Pump -  Perform EVAP System Leak Detection Pump Inspection. Refer to FUEL EVAPORATIVE SYSTEM - EXCEPT PROTEGE & PROTEGE5 under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If EVAP system leak detection pump is okay, go to next step. If EVAP system leak detection pump is faulty, replace EVAP system leak detection pump. After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P2401 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and perform MODE 4 - EVAP SYSTEM REPAIR VERIFICATION DRIVE MODE  under DRIVE CYCLES. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, 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.
  11. 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.
scientia non olet · About LEMON Manuals