DTC P0451:00 [PCM (SKYACTIV-G)]
DTC P0451:00 [PCM (SKYACTIV-G)]
SM2334436
id0102t4300700
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Note
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• To determine the malfunctioning part, proceed with the diagnostics from “Function Inspection Using M-MDS”.
Details On DTCs
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Description |
Fuel tank pressure sensor: sensor characteristic malfunction |
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Detection condition
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Determination conditions
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• The fuel tank pressure sensor input voltage is the threshold or more.
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Preconditions
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• Battery voltage: above 8 V *1
• Period ignition is switched off before engine starts: 120 min or more
• Purge solenoid valve not operating
• The following DTCs are not detected:
*1: Standard can be verified by displaying PIDs using M-MDS
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Malfunction determination period
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• During one drive cycle
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Drive cycle
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• 2
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Self test type
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• CMDTC self test
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Sensor used
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• Fuel tank pressure sensor
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Fail-safe function
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• Not applicable
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Vehicle status when DTCs are output
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• Not applicable
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Possible cause
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• Fuel tank pressure sensor connector or terminals malfunction
• PCM connector or terminals malfunction
• Fuel tank pressure sensor malfunction
• Charcoal canister main malfunction
• Charcoal canister sub malfunction
• CV solenoid valve malfunction
• Evaporative hose malfunction
• PCM malfunction
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System Wiring Diagram
• Not applicable
Function Explanation (DTC Detection Outline)
• The PCM detects the pressure of the fuel tank based on the fuel tank pressure sensor signal. The PCM determines a fuel tank pressure sensor signal error based on the condition in which the fuel tank pressure sensor voltage continues to be the specified value or more, and stores a DTC.
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Repeatability Verification Procedure
1. Switch the ignition off.
2. Leave the vehicle for 2 hours or more.
3. Start the engine and leave it idling for 1 min.
PID Item/Simulation Item Used In Diagnosis
PID/DATA monitor item table
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PIDs |
Reference |
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AMB_AIR_TEMP
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FTP
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Function Inspection Using M-MDS
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Step |
Inspection |
Results |
Action |
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1
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PURPOSE: VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY
• Verify related Service Bulletins, on-line repair information, or Service Information availability.
• Is any related Information available?
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Yes
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Perform repair or diagnosis according to the available information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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2
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PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
• Record the freeze frame data/snapshot data.
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—
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Go to the next step.
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3
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PURPOSE: VERIFY IF FUEL TANK PRESSURE SENSOR HAS MALFUNCTION
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any of the following DTCs displayed?
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Yes
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The possibility of a fuel tank pressure sensor malfunction is high.
• Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC P0452:00 [PCM (SKYACTIV-G)].) (See DTC P0453:00 [PCM (SKYACTIV-G)].) (See DTC P0454:00 [PCM (SKYACTIV-G)].)
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No
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Go to the next step.
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4
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PURPOSE: INSPECTION OF CLOGGING BETWEEN FUEL TANK PRESSURE SENSOR AND FUEL TANK
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any of the following DTCs displayed?
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Yes
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The possibility of clogging between fuel tank pressure sensor and fuel tank is high.
• Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC P144A:00 [PCM (SKYACTIV-G)].)
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No
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Go to the next step.
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5
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PURPOSE: VERIFY IF CV SOLENOID VALVE HAS MALFUNCTION
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any of the following DTCs displayed?
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Yes
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The possibility of a CV solenoid valve malfunction is high.
• Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC P0446:00 [PCM (SKYACTIV-G)].)
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No
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Go to the next step.
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6
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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 M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Is the FTP PID value 0.424 kPa {0.00432 kgf/cm2, 0.0615 psi} or more?
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Yes
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The possibility that the fuel tank pressure is stuck to the high pressure side is high.
• Go to the next step.
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No
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The possibility that the fuel tank pressure is stuck to the low pressure side is high.
• Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 4.
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7
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PURPOSE: VERIFY IF MALFUNCTION CAUSE IS FREEZING OF FUEL TANK PRESSURE SENSOR BY VERIFYING AMBIENT TEMPERATURE
• Start the engine and idle it.
• Access the AMB_AIR_TEMP PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Is the AMB_AIR_TEMP PID value 0 °C {32 °F} or less?
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Yes
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The possibility of a malfunction caused by freezing of the fuel tank pressure sensor is high.
• Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 2.
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Troubleshooting Diagnostic Procedure
Intention of troubleshooting procedure
• Step 1
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― Visually verify that there are no traces of freezing on the fuel tank pressure sensor.
• Step 2—3
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― Inspect the charcoal canister for clogging.
• Step 4
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― Perform a unit inspection of the CV solenoid valve.
• Step 5
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― Verify that there is no breakage or clogging in the evaporative hose.
• Step 6
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― Perform a unit inspection of the fuel tank pressure sensor.
• Repair completion verification
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― Verify that the primary malfunction is resolved and there are no other malfunctions.
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Step |
Inspection |
Results |
Action |
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1
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PURPOSE: VISUALLY VERIFY THAT THERE ARE NO TRACES OF FREEZING ON THE FUEL TANK PRESSURE SENSOR
• Visually inspect for fuel tank pressure sensor.
• Can traces of freezing be verified on the fuel tank pressure sensor?
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Yes
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Evaporative gas freezes when the ambient temperature is low, and it is highly possible that the fuel tank pressure sensor measurement is affected because the vehicle was not refueled appropriately.
• Replace the fuel and perform the repair completion verification.
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No
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Go to Step 6.
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2
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PURPOSE: INSPECTION OF CHARCOAL CANISTER MAIN FOR CLOGGING
• Inspect for clogging in the charcoal canister main. (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Replace the charcoal canister main and perform the repair completion verification.
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No
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Go to the next step.
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3
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PURPOSE: INSPECTION OF CHARCOAL CANISTER SUB FOR CLOGGING
• Inspect for clogging in the charcoal canister sub. (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Replace the charcoal canister sub and perform the repair completion verification.
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No
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Go to the next step.
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4
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PURPOSE: INSPECT CV SOLENOID VALVE FOR MALFUNCTION
• Inspect the applicable part. (See CANISTER VENT (CV) SOLENOID VALVE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See CANISTER VENT (CV) SOLENOID VALVE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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5
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PURPOSE: INSPECTION OF EVAPORATIVE HOSE FOR BREAKAGE OR CLOGGING
• Inspect for breakage or clogging in the evaporative hose (hose between CV solenoid valve and atmosphere).
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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6
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PURPOSE: INSPECT FUEL TANK PRESSURE SENSOR FOR MALFUNCTION
• Inspect the applicable part. (See FUEL TANK PRESSURE SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See FUEL TANK PRESSURE SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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Repair completion verification 1
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PURPOSE: VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Clear the DTC recorded in the memory. (See CLEARING DTC.)
• Replicate the vehicle conditions at the time the DTC was detected using the following procedure.
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Is the same Pending DTC present?
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Yes
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
• If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
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No
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Go to the next step.
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Repair completion verification 2
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PURPOSE: VERIFY IF OTHER DTCs DISPLAYED
• Perform the DTC inspection. (See DTC INSPECTION.)
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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