DESCRIPTION

Fuel tank pressure sensor: sensor characteristic malfunction

DETECTION CONDITION

Determination conditions

• The fuel tank pressure sensor input voltage is the threshold or more.

Preconditions

• 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:

• Purge solenoid valve: P0443:00

• Evaporative passage blockage: P1450:00

• ^*1: Value can be verified by displaying PIDs using M-MDS

Malfunction determination period

• During one drive cycle

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 connector or terminals malfunction

• PCM connector or terminals malfunction

• Fuel tank pressure sensor malfunction

• Charcoal canister malfunction

• CV solenoid valve malfunction

• Evaporative chamber malfunction

• PCM malfunction

Item

Definition

Unit

Condition/Specification

AAT

Ambient air temperature

°C, °F

• Displays ambient air temperature

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

STEP

INSPECTION

RESULTS

ACTION

1

• 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

NOTE:

• 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

• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• 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.

• Go to the applicable PENDING CODE or DTC inspection.

  (See DTC P0452:00 [PCM (SKYACTIV-G 2.0)].)

  (See DTC P0453:00 [PCM (SKYACTIV-G 2.0)].)

  (See DTC P0454:00 [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

4

• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• 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 [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

5

• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• 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 [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

6

• Start the engine and idle it.

• Access the FTP PID using the M-MDS.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• 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 procedure to perform the procedure from Step 3.

7

• Start the engine and idle it.

• Access the AAT PID using the M-MDS.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• 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 procedure to perform the procedure from Step 1.

No

Go to the troubleshooting procedure to perform the procedure from Step 2.

STEP

INSPECTION

RESULTS

ACTION

1

• Visually inspect for fuel tank pressure sensor.

• Can traces of freezing be verified on the fuel tank pressure sensor?

Yes

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, then go to Step 7.

No

Go to Step 6.

2

• Inspect for clogging in the charcoal canister.

  (See CHARCOAL CANISTER INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

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.

3

• Inspect the CV solenoid valve.

  (See CANISTER VENT (CV) SOLENOID VALVE INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

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.

4

• Inspect for breakage or clogging in the evaporative hose (hose between CV solenoid valve and atmosphere).

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 7.

No

Go to the next step.

5

• Inspect for clogging in the evaporative chamber.

  (See EVAPORATIVE CHAMBER INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

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.

6

• Inspect the fuel tank pressure sensor.

  (See FUEL TANK PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the charcoal canister, then go to the next step.

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

No

Go to the next step.

7

• Reconnect all the removed parts.

• Clear the DTC from the PCM memory using the M-MDS.

  (See CLEARING DTC [PCM (SKYACTIV-G 2.0)].)

• Implement the repeatability verification procedure.

  (See Repeatability Verification Procedure.)

• Perform the DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• Is the same DTC present?

Yes

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

• If the malfunction recurs, replace the PCM.

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

Go to the next step.

No

Go to the next step.

8

• 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.