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Home >> Mazda >> 2021 >> CX-5 Sport, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (On-Board Diagnostic - Engine Control (VIN Y) (2 Of 3)) >> DTC P0451-00: Fuel Tank Pressure Sensor: Sensor Characteristic Malfunction >> PID Item/Simulation Item Used In Diagnosis >> Function Inspection Using M-MDS

Function Inspection Using M-MDS

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DIAGNOSTIC PROCEDURE - FUNCTION INSPECTION USING M-MDS

STEP INSPECTION RESULTS ACTION
1 PURPOSE: 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.
2 PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION
  • Recording can be facilitated using the screen capture function of the PC.
  • Record the FREEZE FRAME DATA/snapshot data on the repair order.
 - Go to the next step.
3 PURPOSE: VERIFY IF FUEL TANK PRESSURE SENSOR HAS MALFUNCTION
  • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST .)
  • Is the PENDING CODE/DTC P0452:00, P0453:00 or P0454:00 also present?
 Yes The possibility of a fuel tank pressure sensor malfunction is high.
No Go to the next step.
4 PURPOSE: INSPECTION OF CLOGGING BETWEEN FUEL TANK PRESSURE SENSOR AND FUEL TANK
  • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST .)
  • Is the PENDING CODE/DTC P144A:00 also present?
 Yes The possibility of clogging between fuel tank pressure sensor and fuel tank is high.
  • Go to the applicable PENDING CODE or DTC inspection. (See DTC P144A:00 .)
No Go to the next step.
5 PURPOSE: VERIFY IF CV SOLENOID VALVE HAS MALFUNCTION
  • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST .)
  • Is the PENDING CODE/DTC P0446:00 also present?
 Yes The possibility of a CV solenoid valve malfunction is high.
  • Go to the applicable PENDING CODE or DTC inspection. (See DTC P0446:00 .)
No Go to the next step.
6 PURPOSE: VERIFY IF FUEL TANK PRESSURE IS STUCK TO EITHER LOW OR HIGH PRESSURE SIDE
  • Start the engine and idle it.
  • Access the FTP PID using the MMDS. (See ON-BOARD DIAGNOSTIC TEST .)
  • Is the FTP PID value 0.424 kPa {0.00432 kgf/cm2 , 0.0615 psi} or more?
 Yes The possibility that the fuel tank pressure is stuck to the high pressure side is high.
  • Go to the next step.
No The possibility that the fuel tank pressure is stuck to the low pressure side is high.
  • Go to the Troubleshooting Diagnostic Procedure to perform the procedure from Step 3.
7 PURPOSE: VERIFY IF MALFUNCTION CAUSE IS FREEZING OF FUEL TANK PRESSURE SENSOR BY VERIFYING AMBIENT TEMPERATURE
  • Start the engine and idle it.
  • Access the AAT PID using the MMDS. (See ON-BOARD DIAGNOSTIC TEST .)
  • Is the AAT PID value 0 °C {32 °F} or less?
 Yes The possibility of a malfunction caused by freezing of the fuel tank pressure sensor is high.
  • Go to the Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
No Go to the Troubleshooting Diagnostic Procedure to perform the procedure from Step 2.
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