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Home >> Mazda >> 2007 >> 6 Mazdaspeed >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System L3 With TC] >> DTC P2401 >> Diagnostic procedure
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Diagnostic procedure

DTC P2401 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has the FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online repair information availability.
  • Is any related repair information available?
 Yes Perform the repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 VERIFY RELATED PENDING CODE OR STORED DTC 
  • Turn the ignition switch to the OFF then ON position (Engine off).
  • Verify related PENDING CODE or stored DTC.
  • Is DTC P2405 present?
 Yes Go to appropriate DTC inspection.
(See DTC P2405 ).
No Go to the next step.
4 INSPECT EVAP SYSTEM LEAK DETECTION PUMP CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect EVAP system leak detection pump connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 10.
No Go to the next step.
5 INSPECT EVAP SYSTEM LEAK DETECTION PUMP MOTOR CIRCUIT FOR OPEN CIRCUIT 
  • Disconnect the main relay.
  • Inspect continuity between EVAP system leak detection pump terminal A (harness-side) and main relay.
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit, then go to Step 10.
6 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair the terminal, then go to Step 10.
No Go to the next step.
7 INSPECT EVAP SYSTEM LEAK DETECTION PUMP MOTOR CIRCUIT FOR SHORT TO GROUND 
  • Inspect for continuity between EVAP system leak detection pump terminal D (harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace the wiring harness for a short to ground, then go to Step 10.
No Go to the next step.
8 INSPECT EVAP SYSTEM LEAK DETECTION PUMP MOTOR CIRCUIT FOR OPEN CIRCUIT 
  • Inspect continuity between EVAP system leak detection pump terminal D (harness-side) and PCM terminal 3Y (harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit, then go to Step 10.
9 INSPECT EVAP SYSTEM LEAK DETECTION PUMP 
 Yes Go to the next step.
No Replace the EVAP system leak detection pump, then go to the next step.
10 VERIFY TROUBLESHOOTING OF DTC P2401 COMPLETED 
  • Make sure to reconnect air disconnected connectors.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Perform the EVAP system test using the WDS or equivalent.

    (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION ).

  • Is the same DTC present?
    NOTE:
    • If EVAP system test function is not available, take following procedure.
      • Start the engine and perform the "EVAP System Repair Verification Drive Mode".

        (See OBD-II DRIVE MODE ).

      • Is the PENDING CODE for this DTC present?
 Yes Replace the PCM, then go to the next step.
No Go to the next step.
11 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC Inspection.
(See DTC TABLE ).
No Troubleshooting completed.
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