DTC P0453:00 [PCM (SKYACTIV-G 2.5T)]

id0102s8300900

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 2M • 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 2Y • Open circuit in wiring harness between fuel tank pressure sensor terminal B and PCM terminal 2V • PCM malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	RECORD VEHICLE STATUS AT TIME OF DTC DETECTION 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 on the repair order.	—	Go to the next step.
2	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.
2		No	Go to the next step.
3	DETERMINE IF FUEL TANK PRESSURE SENSOR OR WIRING HARNESS MALFUNCTION • Access the FTP PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)].) • Verify the FTP PID value. • Is the FTP PID value 5 V or B+?	Yes	Go to Step 7.
3		No	Go to the next step.
4	INSPECT FUEL TANK PRESSURE SENSOR CONNECTOR CONDITION • 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.
4		No	Go to the next step.
5	INSPECT PCM CONNECTOR CONDITION • 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.
5		No	Go to the next step.
6	INSPECT FUEL TANK PRESSURE SENSOR • Inspect the fuel tank pressure sensor. (See FUEL TANK PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.5T].) • Is there any malfunction?	Yes	Replace the charcoal canister, then go to Step 12. (See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].)
6		No	Go to Step 12.
7	DETERMINE IF FUEL TANK PRESSURE SENSOR SIGNAL CIRCUIT OR FUEL TANK PRESSURE SENSOR GROUND CIRCUIT MALFUNCTION • 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 2.5T)].) • Verify the FTP PID value. • Is the FTP PID value 5 V or B+?	Yes	Go to the next step.
7		No	Go to Step 10.
8	INSPECT FUEL TANK PRESSURE SENSOR SIGNAL CIRCUIT FOR TO POWER SUPPY • 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.
8		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 2M. 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	INSPECT FUEL TANK PRESSURE SENSOR POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT TO EACH OTHER • 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 2Y • Fuel tank pressure sensor terminal C—PCM terminal 2M 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.
9		No	Replace the PCM, then go to Step 12. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].)
10	INSPECT FUEL TANK PRESSURE SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO POWER SUPPLY • 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.
10		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 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.
11	INSPECT FUEL TANK PRESSURE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • 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 2V (wiring harness-side). • Is there continuity?	Yes	Replace the charcoal canister, then go to the next step. (See CHARCOAL CANISTER REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].)
11		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 2V. 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	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.5T)].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [PCM (SKYACTIV-G 2.5T)].) • 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 2.5T].) Go to the next step.
12		No	Go to the next step.
13	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.5T)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
13		No	DTC troubleshooting completed.