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DTC P0453: Evaporative Emission System Pressure Sensor High Input
 
 
 
 
CIRCUIT OPERATION
  • The ECM terminal FDP5 supplies a 5 volts reference signal to the fuel tank differential pressure sensor. The fuel tank differential pressure sensor is grounded through the ECM terminal FDPE.
  • The fuel tank differential pressure sensor returns a voltage signal to the ECM terminal FDPS that is proportional to the pressure in the fuel tank.
 
 
TECHNICAL DESCRIPTION
  • To determine whether the fuel tank differential pressure sensor is defective, the ECM monitors the fuel tank differential pressure sensor output voltage.
  • The ECM judges if the fuel tank differential pressure sensor output voltage is normal.
 
 
DESCRIPTIONS OF MONITOR METHODS
  • Fuel tank differential pressure sensor output voltage is out of specified range.
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensors below are determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Condition
  • More than 2 seconds have passed since the power supply mode of electric motor switch was ON.
Judgment Criterion
  • The fuel tank differential pressure sensor output voltage remains is more than 4.951 volts for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Fuel filler lid cannot be opened even when pressing the fuel filler lid opener switch.
  • Indicates "REFUELING SYSTEM SERVICE REQUIRED" on the information screen in the multi-information display.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
  • Fuel tank differential pressure sensor failed.
  • Shorted fuel tank differential pressure sensor circuit, or connector damage.
  • ECM failed.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check data list item 210: Fuel Tank Differential Pressure Sensor.
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) .
(2) Turn on the power supply mode of the electric motor switch.
(3) Remove the fuel cap.
(4) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 210, Fuel Tank Differential Pressure Sensor.
  • The standard value should be -0.57 to 0.57 kPa (-0.168 to 0.168 in.Hg).
(5) Install the fuel cap.
(6) Turn off the power supply mode of the electric motor switch.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting / Inspection Service Points - How to Cope with Intermittent Malfunctions .
Go to Step 2.
 
STEP 2. Check of short circuit to power supply in FDPS line between fuel tank differential pressure sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 3.
Repair the connector(s) or wiring harness. Then go to Step 4.
 
STEP 3. Replace the fuel tank differential pressure sensor.
(1) Replace the fuel tank differential pressure sensor.
(2) Carry out test drive with the drive cycle pattern. Refer to Diagnostic Function. OBD-II Drive Cycle. Pattern 1 .
(3) Check the diagnostic trouble code (DTC).
Is DTC P0453 set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 4.
The inspection is complete.
 
STEP 4. Perform the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0453 set?
Retry the troubleshooting.
The inspection is complete.