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DTC P1450:00 [PCM (SKYACTIV-G 2.0)]

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: Value can be verified by displaying PIDs using M-MDS

Malfunction determination period

  • 75 s period

Drive cycle

  • 1

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

    • Evaporative chamber malfunction

    • Charcoal canister malfunction

  • Clogging between fuel tank and fuel tank pressure sensor

  • Pressure control valve malfunction

  • 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.

Repeatability Verification Procedure

  • Set the remaining fuel quantity in the fuel tank between 30—85 %.

  • Verify that OBD-II information (such as FREEZE FRAME DATA) has been obtained and recorded.

  • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.0)].)

  • Start the engine and switch the ignition off after 5 s have elapsed.

  • Leave the vehicle for 6 hours or more.

  • Start the engine and leave it idling for 2 min.

  • 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.

  • Stop the engine.

  • 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

KPa , mBar , 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

EVAPCP

Purge solenoid valve control signal

%

  • Changes % and forcibly drives/stops purge solenoid valve.

EVAPCV

CV solenoid valve control signal

Off/On

  • Selects Off/On to forcibly drive/stop the CV solenoid valve.

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 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

Yes

The possibility of clogging between fuel tank pressure sensor and fuel tank is high.

No

Go to the next step.

4

 PURPOSE: VERIFY FUEL TANK PRESSURE SENSOR MEASURED CORRECTLY

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

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

Yes

Go to the troubleshooting procedure to perform the procedure from Step 6.

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—5

    • Verify if there is restriction in atmosphere release passage.

  • Step 6

    • Perform the inspection for a purge solenoid valve stuck open.

  • Step 7—8

    • 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

Yes

Replace the charcoal canister, then go to Step 7.

(See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

2

 PURPOSE: DETERMINE INTEGRITY OF CV SOLENOID VALVE

Yes

Replace the CV solenoid valve, then go to Step 7.

(See CANISTER VENT (CV) SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

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 evaporative chamber

    • Between evaporative chamber 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 7.

No

Go to the next step.

4

 PURPOSE: DETERMINE INTEGRITY OF EVAPORATIVE CHAMBER

Yes

Replace the evaporative chamber, then go to Step 7.

(See EVAPORATIVE CHAMBER REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

5

 PURPOSE: DETERMINE INTEGRITY OF CHARCOAL CANISTER

Yes

Replace the charcoal canister, then go to Step 7.

(See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

6

 PURPOSE: DETERMINE INTEGRITY OF PURGE SOLENOID VALVE

Yes

Replace the purge solenoid valve, then go to the next step.

(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

7

 PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION

Yes

Repeat the inspection from Step 1 of the troubleshooting diagnostic procedure.

Go to the next step.

No

Go to the next step.

8

 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 2.0)].)

No

DTC troubleshooting completed.
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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