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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 636 (On-Board Diagnostic (Engine Control System L5) (4 Of 5)) >> DTC P144A:00 [L5] >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (EVAP system related) been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform 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 AND STORED DTC 
  • Switch the ignition to off, then to ON (engine off).
  • Verify pending and stored DTCs using the M-MDS.
  • Is the DTC P0451:00, P0452-00, P045300 or P0454 00 also present?
 Yes Go to the applicable DTC inspection
(See DTC P0451:00 [L5] .)
(See DTC P0452:00 [L5] .)
(See DTC P0453:00 [L5] .)
(See DTC P0454:00 [L5] .)
No Go to the next step.
4 INSPECT FOR BLOCKED FUEL VAPOR TUBE BETWEEN FUEL TANK PRESSURE SENSOR AND FUEL TANK 
  • Switch the ignition to off
  • Remove the fuel vapor tube assembly.

    (See FUEL TANK REMOVAL/INSTALLATION [L5] .)

  • Visually inspect the fuel vapor tube for a blockage between the fuel tank pressure sensor and the connection to the fuel tank
  • Visually inspect the connection at the fuel tank for a blockage.
  • Attempt to manually remove the blockage.
  • Is the blockage visible and can be removed?
 Yes Remove the blockage, then go to the next step.
No Replace a fuel vapor tube assembly, then go to the next step
5 VERIFY DTC TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors
  • Clear the DTC from the PCM memory using the M-MDS
  • Perform the Drive Mode 06 (EVAP System Repair Verification Drive Mode)

    (See OBD-II DRIVE MODE [L5] .)

  • Is the PENDING CODE for this DTC present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L5] .)
No Go to the next step
6 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection
(See DTC TABLE [L5] .)
No DTC troubleshooting completed
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