DTC P0453:00

Fuel tank pressure sensor high input

DETECTION CONDITION

• The PCM monitors the EVAP control system fuel tank pressure sensor input signal to the PCM. The test fails when the signal average jumps above a maximum allowable calibrated parameter.

Diagnostic support note

• This is a continuous monitor (CCM).

• The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA/Snapshot data is available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

• Fuel tank pressure sensor connector or terminals malfunction

• PCM connector or terminals malfunction

• Fuel tank pressure sensor malfunction

• Short to power supply in wiring harness between fuel tank pressure sensor terminal C and PCM terminal 2Y

• Fuel tank pressure sensor power supply circuit and signal circuit are shorted to each other

• Short to power supply in wiring harness between fuel tank pressure sensor terminal A and PCM terminal 2BB

• Open circuit in wiring harness between fuel tank pressure sensor terminal B and PCM terminal 2AJ

• PCM malfunction

Item (definition)

Unit/Condition

Definition

Condition/Specification (Reference)

FTP

KPa , mBar , psi, in H20

Fuel tank pressure

• Displays fuel tank pressure

V

Fuel tank pressure sensor voltage

• Fuel tank pressure is equal to barometric pressure: Approx. 2.6 V

STEP

INSPECTION

ACTION

1

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.

2

• 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.

3

• Access the FTP PID using the M-MDS.

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

• Verify the FTP PID value.

• Is the FTP PID value 5 V or B+?

Yes

Go to Step 7.

No

Go to the next step.

4

• Switch the ignition off.

• Disconnect the fuel tank pressure sensor connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 12.

No

Go to the next step.

5

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 12.

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 Step 12.

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

No

Go to Step 12.

7

• Switch the ignition off.

• Disconnect the fuel tank pressure sensor connector.

• Access the FTP PID using the M-MDS.

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

• Verify the FTP PID value.

• Is the FTP PID value 5 V or B+?

Yes

Go to the next step.

No

Go to Step 10.

8

• Verify that the fuel tank pressure sensor connector is disconnected.

• Switch the ignition off.

• Disconnect the PCM connector.

• Switch the ignition ON (engine off).

  NOTE:

  • Another DTC may be stored by the PCM detecting an open circuit.

• Measure the voltage at the fuel tank pressure sensor terminal C (wiring harness-side).

• Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between fuel tank pressure sensor terminal C and PCM terminal 2Y.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to power supply.

Go to Step 12.

9

• Verify that the fuel tank pressure sensor and PCM connectors are disconnected.

• Inspect for continuity between fuel tank pressure sensor terminal A and C (wiring harness-side).

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Fuel tank pressure sensor terminal A???PCM terminal 2BB

• Fuel tank pressure sensor terminal C???PCM terminal 2Y

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to each other.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to each other.

Go to Step 12.

No

Replace the PCM, then go to Step 12.

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

10

• Verify that the fuel tank pressure sensor connector is disconnected.

• Switch the ignition ON (engine off).

  NOTE:

  • Another DTC may be stored by the PCM detecting an open circuit.

• Measure the voltage at the fuel tank pressure sensor terminal A (wiring harness-side).

• Is the voltage 5 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between fuel tank pressure sensor terminal A and PCM terminal 2BB.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to power supply.

Go to Step 12.

11

• Verify that the fuel tank pressure sensor connector is disconnected.

• Switch the ignition off.

• Disconnect the PCM connector.

• Inspect for continuity between fuel tank pressure sensor terminal B (wiring harness-side) and PCM terminal 2AJ (wiring harness-side).

• Is there continuity?

Yes

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

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

No

Refer to the wiring diagram and verify whether or not there is a common connector between fuel tank pressure sensor terminal B and PCM terminal 2AJ.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to the next step.

12

• Always reconnect all disconnected connectors.

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

  (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0)].)

• Perform the KOEO or KOER self test.

  (See KOEO/KOER SELF TEST [PCM (SKYACTIV-G 2.0)].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• 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.

13

• Perform the ???AFTER REPAIR PROCEDURE???.

  (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

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

No

DTC troubleshooting completed.