DTC P1450:00 [PCM (SKYACTIV-G 2.5T)]

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Note
•  To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

DESCRIPTION

Evaporator system: abnormal negative pressure in fuel tank
DETECTION CONDITION
Determination conditions
•  Target negative pressure exceeding the specified time or more is generated from negative pressure inducted to the fuel tank by the operation of the purge solenoid valve after the fuel tank is sealed (CV solenoid valve ON).
Preconditions
•  Period ignition is switched off before engine is started: 120 min or more
•  Engine coolant temperature at engine start: 1.67—43.33 °C {35.1—109.9 °F}*1
•  Time elapsed from engine start: 5.5—90 min
•  Fuel level in fuel tank: 10—90 %*1
•  Desired ambient air temperature: 4.4—43.3 °C {40—109 °F}*1
•  Barometric pressure: 72.23 Pa {7.365 kgf/m2, 0.01048 psi} or more*1
•  Charging efficiency: 3—65 %*1
•  Vehicle speed: 64—144.8 km/h {40.00—89.97 mph}*1
•  Purge flow amount: 15 l/min or more
*1: Standard can be verified by displaying PIDs using M-MDS
Malfunction determination period
•  75 s period
Drive cycle
•  2
Self test type
•  CMDTC self test
Sensor used
•  Fuel tank pressure sensor
FAIL-SAFE FUNCTION
•  Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT
•  Illuminates check engine light.
POSSIBLE CAUSE
•  Fuel tank pressure sensor malfunction
•  Restriction between charcoal canister and release-side passage
?  CV solenoid valve malfunction
?  Charcoal canister malfunction
•  Clogging between fuel tank and fuel tank pressure sensor
•  Purge solenoid valve malfunction
•  PCM malfunction

System Wiring Diagram

•  Not applicable

Function Explanation (DTC Detection Outline)

•  The PCM closes the purge solenoid valve and CV solenoid valve while the vehicle is being driven and seals the fuel tank. Then, the evaporative gas in the fuel tank is inducted into the intake manifold and the pressure in the fuel tank is decreased by opening the purge solenoid valve, and the pressure change of the fuel tank is measured using the fuel tank pressure sensor. If the pressure in the fuel tank decreases below the target negative pressure for the specified period from the pressure measurement, the PCM determines that abnormal negative pressure in the fuel tank is being generated and stores a DTC.
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Repeatability Verification Procedure

1.  Set the remaining fuel quantity in the fuel tank between 30—85 %.
2.  Verify that OBD-II information (such as FREEZE FRAME DATA) has been obtained and recorded.
3.  Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.5T)].)
4.  Start the engine and switch the ignition off after 5 s have elapsed.
5.  Leave the vehicle for 6 hours or more.
6.  Start the engine and leave it idling for 2 min.
7.  Drive the vehicle for 30 min at a speed of 50 km/h {31 mph} or more (to increase temperature in fuel tank and generate evaporative gas).
Note
•  If driving the vehicle for 30 min at a speed of 50 km/h {31 mph} or more is not feasible, the vehicle can be driven for a continuous 15 min or more with the engine coolant temperature at 80 °C {176 °F} or more.
8.  Stop the engine.
9.  Leave the vehicle for 1 hours or more.

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Item

Definition

Unit

Condition/Specification
FTP
Fuel tank pressure
Pa {KPa}, mBar {Bar}, psi, in H20
•  Displays fuel tank pressure
Fuel tank pressure sensor voltage
V
•  Fuel tank pressure is equal to barometric pressure: Approx. 2.6 V

Simulation item table

Item

Definition

Unit

Operation

Other condition
EVAPCP
Purge solenoid valve control signal
%
•  Changes % and forcibly drives/stops purge solenoid valve.
•  Under the following conditions:
?  Override drive parameter input range: 0—100%
EVAPCV
CV solenoid valve control signal
Off/On
•  Selects Off/On to forcibly drive/stop the CV solenoid valve.
Caution
•  Do not add fuel with the CV solenoid valve closed. Otherwise, it will result in air pollution because the evaporative gas in the fuel tank will escape directly into the atmosphere.
Note
•  Override drive parameter: Off
?  CV solenoid valve: open
•  Override drive parameter: On
?  CV solenoid valve: close


Function Inspection Using M-MDS

STEP

INSPECTION

RESULTS

ACTION
1
PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
PURPOSE: RECORD FREEZE FRAME DATA/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS TO UTILIZE WITH REPEATABILITY VERIFICATION
Note
•  Recording can be facilitated using the screen capture function of the PC.
•  Record the FREEZE FRAME DATA/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (EVAP system related) on the repair order.
—
Go to the next step.
3
PURPOSE: INSPECTION OF CLOGGING BETWEEN FUEL TANK PRESSURE SENSOR AND FUEL TANK
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  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.
No
Go to the next step.
4
PURPOSE: VERIFY FUEL TANK PRESSURE SENSOR MEASURED CORRECTLY
•  Start the engine and idle it.
•  Access the following simulation items using the M-MDS:
?  EVAPCP
?  EVAPCV
•  Change to the following conditions using the simulation function.
?  EVAPCP: 100 %
?  EVAPCV: On
•  Access the FTP PID using the M-MDS.
•  Does the negative pressure change when racing the engine?
Yes
Go to the next step.
No
Go to the troubleshooting procedure to perform the procedure from Step 1.
5
PURPOSE: VERIFY IF ATMOSPHERE BETWEEN CV SOLENOID VALVE AND ATMOSPHERE CAN RELEASE
•  Access the following simulation items using the M-MDS:
?  EVAPCP
?  EVAPCV
•  Change to the following conditions using the simulation function.
?  EVAPCP: 0 %
?  EVAPCV: Off
•  Access the FTP PID using the M-MDS.
•  Is the displayed PID value as follows?
?  Approx. 2.6 V (barometric pressure)
Yes
Go to the next step.
No
Go to the troubleshooting procedure to perform the procedure from Step 2.
6
PURPOSE: VERIFY IF PURGE SOLENOID VALVE IS STUCK OPEN
•  Access the following simulation items using the M-MDS:
?  EVAPCP
?  EVAPCV
•  Change to the following conditions using the simulation function.
?  EVAPCP: 0 %
?  EVAPCV: On
•  Access the FTP PID using the M-MDS.
•  Is the FTP PID value negative pressure?
Yes
Go to the troubleshooting procedure to perform the procedure from Step 5.
No
Go to the troubleshooting procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure
•  Step 1
?  Perform a PCM input signal part-related inspection.
•  Step 2—4
?  Verify if there is restriction in atmosphere release passage.
•  Step 5
?  Perform the inspection for a purge solenoid valve stuck open.
•  Step 6—7
?  Verify that the primary malfunction is resolved and there are no other malfunctions.

STEP

INSPECTION

RESULTS

ACTION
1
PURPOSE: DETERMINE INTEGRITY OF FUEL TANK PRESSURE SENSOR
•  Inspect the fuel tank pressure sensor.
•  Is there any malfunction?
Yes
Replace the charcoal canister, then go to Step 6.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].)
No
Go to the next step.
2
PURPOSE: DETERMINE INTEGRITY OF CV SOLENOID VALVE
•  Inspect the CV solenoid valve.
•  Is there any malfunction?
Yes
Replace the CV solenoid valve, then go to Step 6.
(See CANISTER VENT (CV) SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].)
No
Go to the next step.
3
PURPOSE: VERIFY IF THERE IS RESTRICTION BETWEEN CHARCOAL CANISTER AND ATMOSPHERE RELEASE PASSAGE
•  Verify the following passage hoses, pipe connection condition, and that there is no restriction.
?  Between charcoal canister and CV solenoid valve
?  Between CV solenoid valve and atmosphere release
•  Is there any poor connection or restriction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 6.
No
Go to the next step.
4
PURPOSE: DETERMINE INTEGRITY OF CHARCOAL CANISTER
•  Inspect the charcoal canister.
•  Is there any malfunction?
Yes
Replace the charcoal canister, then go to Step 6.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].)
No
Go to the next step.
5
PURPOSE: DETERMINE INTEGRITY OF PURGE SOLENOID VALVE
•  Inspect the purge solenoid valve.
•  Is there any malfunction?
Yes
Replace the purge solenoid valve, then go to the next step.
(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].)
No
Go to the next step.
6
PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION
•  Reconnect all the removed parts.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Implement the repeatability verification procedure.
•  Perform the Pending Trouble Code Access Procedure.
•  Is the PENDING CODE for this DTC present?
Yes
Repeat the inspection from Step 1 of the troubleshooting diagnostic procedure.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
7
PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION
•  Is any other DTC or pending code stored?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
No
DTC troubleshooting completed.