DESCRIPTION

Evaporator system: clogging between fuel tank and fuel tank pressure sensor

DETECTION CONDITION

Determination conditions

• The following conditions are all met while the vehicle is being driven:

• If negative pressure is inducted to the fuel tank via the intake manifold by the operation of the purge solenoid valve with the fuel tank in a sealed condition and the target negative pressure is reached within a shorter period of time than the estimated time.

• When the barometric pressure in the fuel tank is fixed and the purge solenoid valve is opened/closed, the negative pressure fluctuation in the fuel tank generates negative pressure exceeding the threshold.

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

• Erratic signal to PCM

• Fuel tank pressure sensor signal malfunction

• Fuel gauge sender unit malfunction

• Fuel tank pressure sensor malfunction

• Clogging between fuel tank and fuel tank pressure sensor

• Pressure control valve malfunction

• Fuel shut-off valve malfunction

• Rollover valve malfunction

• Purge solenoid valve malfunction

• PCM malfunction

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

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.

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 and DIAGNOSTIC MONITORING TEST RESULTS (EVAP system related) 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 P0460:00, P0461:00, P0462:00 or P0463:00 also present?

Yes

Perform the DTC troubleshooting for the fuel gauge sender unit first because the fuel gauge sender unit cannot detect the fuel tank level and determines that a malfunction is occurring.

(See DTC P0460:00 [PCM (SKYACTIV-G 2.0)].)

(See DTC P0461:00 [PCM (SKYACTIV-G 2.0)].)

(See DTC P0462:00 [PCM (SKYACTIV-G 2.0)].)

(See DTC P0463:00 [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

4

• Start the engine and idle it.

• Access the following simulation items using the M-MDS:

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

• EVAPCP

• EVAPCV

• Change to the following conditions using the simulation function.

• EVAPCP: 100 %

• EVAPCV: On

• Access the FTP PID using the M-MDS.

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

• Does the negative pressure change when racing the engine?

Yes

The fuel tank pressure sensor measures correctly.

• Go to the next step.

No

The possibility of a fuel tank pressure sensor malfunction is high.

• Go to the troubleshooting procedure to perform the procedure from Step 1.

5

• Perform the following procedure to induct barometric pressure to the fuel tank.

• Access the following simulation items using the M-MDS:

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

• EVAPCP

• EVAPCV

• Change to the following conditions using the simulation function.

• EVAPCP: 0 %

• EVAPCV: Off

• Access the FTP PID using the M-MDS.

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

  NOTE:

  • The displayed PID value is as follows:

  • Approx. 2.6 V (barometric pressure)

• Perform the following procedure to force drive the CV solenoid valve.

• Access the following simulation items using the M-MDS:

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

• EVAPCP

• EVAPCV

• Change to the following conditions using the simulation function.

• EVAPCP: 0 %

• EVAPCV: On

• Access the FTP PID using the M-MDS.

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

• Is the FTP PID value negative pressure?

Yes

The possibility of a stuck purge solenoid valve open is high.

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

No

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

• Go to the troubleshooting procedure to perform the procedure from Step 3.

STEP

INSPECTION

RESULTS

ACTION

1

• 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 Step 7.

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

No

Go to the next step.

2

• Inspect the purge solenoid valve.

  (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

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

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

No

Go to the next step.

3

• Verify the following passage hoses, pipe connection condition, and that there is no clogging.

• Between fuel tank pressure sensor and pressure control valve

• Between pressure control valve and fuel shut-off valve

• Is there any poor connection or clogging?

Yes

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

No

Go to the next step.

4

• Inspect the pressure control valve.

  (See PRESSURE CONTROL VALVE INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the pressure control valve, then go to Step 7.

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

No

Go to the next step.

5

• Inspect the fuel shut-off valve.

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

• Is there any malfunction?

Yes

Replace the fuel tank, then go to Step 7.

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

No

Go to the next step.

6

• Inspect the rollover valve.

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

• Is there any malfunction?

Yes

Replace the fuel tank, then go to the next step.

(See FUEL TANK 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.