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DTC P0453: Evaporative
Emission Control System Pressure Sensor High Input
CIRCUIT OPERATION
- The ECM (terminal No. 114) supplies a 5 volts reference
voltage to the fuel tank differential pressure sensor (terminal No. 3). The ECM (terminal No.
113) supplies a ground to the fuel tank differential pressure sensor (terminal No. 2).
- The ECM (terminal No. 112) receives a voltage signal proportional to the pressure
in the fuel tank from the fuel tank differential pressure sensor (terminal No. 1).
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.
| note |
In rare cases, this DTC may be also set under some fuel and driving conditions regardless
of the fuel pressure sensor output voltage when the fuel system is clogged.
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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 stored in memory for the item monitored
below)
- Evaporative emission purge solenoid monitor
- Evaporative emission ventilation solenoid monitor
- Fuel tank temperature sensor monitor
- Fuel level sensor monitor
Sensor (The sensors below are determined to be normal)
- Mass airflow sensor
- Barometric pressure sensor
- Intake air temperature sensor
- Engine coolant temperature sensor
- Accelerator pedal position sensor
DTC SET CONDITIONS
Logic Flow Chart (Monitor Sequence)
Check Conditions
- 2 seconds or more have passed since the starting sequence was completed.
- The fuel temperature is 36°C (97°F) or less.
- Remaining fuel level is 85 percent or less when the engine is started.
Judgement Criterion
- The fuel tank differential pressure sensor output voltage remains 4.8 volts or greater
for 5 seconds.
FAIL-SAFE AND BACKUP FUNCTION
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 
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TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
- Fuel tank differential pressure sensor failed.
- Open fuel tank differential pressure sensor circuit, or connector damage.
- ECM failed.
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Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
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STEP 1. Using scan tool MB991958, check
data list item 52: Fuel Tank Differential Pressure Sensor.
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| caution |
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"
(OFF) position before connecting or disconnecting scan tool MB991958.
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(1)Connect scan tool MB991958 to the data link connector.
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(2)Disconnect hose E from the evaporative emission canister, and plug the hose.
(3)Turn the ignition switch to the "ON" position.
(4)Remove the fuel cap.
(5)Set scan tool MB991958 to the data reading mode for item 52, Fuel Tank Differential
Pressure Sensor.
- Output voltage should be between 1,500 to 3,500 mV.
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(6)Connect the evaporative emission system pressure pump (Miller number 6872A) to the fuel
tank filler tube by using fuel tank adapter (MLR-8382) and pressurize the fuel tank.
- The fuel tank pressure reading should increase.
(7)Turn the ignition switch to the "LOCK" (OFF) position. Then disconnect scan tool
MB991958.
(8)Remove the evaporative emission system pressure pump (Miller number 6872A) and
the fuel tank adapter (MLR-8382), and reinstall the fuel cap.
(9)Connect hose E to the evaporative emission canister.
Q.
Is the sensor operating ptoperly?
 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 .
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STEP 2. Measure the ground voltage at fuel tank differential pressure
sensor connector D-21 by backprobing.
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(1)Do not disconnect the connector D-21.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal No. 2 and ground by backprobing.
- Voltage should be 0.5 volt or less.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is the measured voltage 0.5 volt or less?
Go to Step 6 .
Go to Step 3 .
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STEP 3. Check harness connector D-21 at the fuel tank differential
pressure sensor and harness connector B-10 at ECM for damage.
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Q.
Is the harness connector in good condition?
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Go to Step 4 .
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Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection .
Then go to Step 7 .
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STEP 4. Check for open circuit between fuel tank differential pressure
sensor connector D-21 (terminal No. 2) and ECM connector B-10 (terminal No. 113).
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| note |
Check harness after checking intermediate connector C-47. If intermediate connector is
damaged, repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then
go to Step 7 .
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Q.
Is the harness wire in good condition?
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Go to Step 5 .
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Repair it. Then go to Step 7 .
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STEP 5. Using scan tool MB991958, check data list
item 52: Fuel Tank Differential Pressure Sensor.
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| caution |
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"
(OFF) position before connecting or disconnecting scan tool MB991958.
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(1)Connect scan tool MB991958 to the data link connector.
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(2)Disconnect hose E from the evaporative emission canister, and plug the hose.
(3)Turn the ignition switch to the "ON" position.
(4)Remove the fuel cap.
(5)Set scan tool MB991958 to the data reading mode for item 52, Fuel Tank Differential
Pressure Sensor.
- Output voltage should be between 1,500 to 3,500 mV.
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(6)Connect the evaporative emission system pressure pump (Miller number 6872A) to the fuel
tank filler tube by using fuel tank adapter (MLR-8382) and pressurize the fuel tank.
- The fuel tank pressure reading should increase.
(7)Turn the ignition switch to the "LOCK" (OFF) position. Then disconnect scan tool
MB991958.
(8)Remove the evaporative emission system pressure pump (Miller number 6872A) and
the fuel tank adapter (MLR-8382), and reinstall the fuel cap.
(9)Connect hose E to the evaporative emission canister.
Q.
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 .
Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP
42B, Diagnosis - ID Code Registration Judgment Table <Vehicles with KOS> or
GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> .
Then go to Step 7 .
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STEP 6. Check harness connector D-21 at the fuel tank differential
pressure sensor and harness connector B-10 at ECM for damage.
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Q.
Is the harness connector in good condition?
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Replace the fuel tank differential pressure sensor. Then go to Step 7 .
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Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection .
Then go to Step 7 .
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STEP 7. Test the OBD-II drive cycle.
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(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II
Drive Cycle - Pattern 23 .
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(2)Check the diagnostic trouble code (DTC).
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Retry the troubleshooting.
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The inspection is complete.
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