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For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Bonneville 🢒 DTC 🢒 DTC P0453 Fuel Tank Pressure Sensor Circuit High Voltage

Object Number: 574376 Size: MF
Engine Controls Components
OBD II Symbol Description Notice
Fuel Tank Pressure Sensor, EVAP Vent Valve
Handling ESD Sensitive Parts Notice
Sensors
Transmission Inputs L36/L67
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice

Circuit Description

The PCM monitors the fuel tank pressure sensor signal to detect vacuum decay and excess vacuum during the enhanced EVAP diagnostic. The fuel tank pressure sensor measures the difference between the air pressure (or vacuum) in the tank and the outside air pressure. The PCM applies a 5.0 volt reference and ground to the sensor. The sensor will return a signal voltage between 0.1 and 4.9 volts. If the PCM detects a fuel tank pressure sensor signal that is excessively high, DTC P0453 will set.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC
    • The fuel tank pressure sensor signal is more than 4.7 volts.
    • The condition is present for 1 seconds.

Action Taken When the DTC Sets
    • The PCM will illuminate the MIL during the second consecutive trip in which the diagnostic test has been run and failed.
    • The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

Conditions for Clearing the MIL/DTC
    • The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.
    • The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
    • The DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.

Diagnostic Aids

Continue the diagnosis at step 4 if you were sent here from one of the EVAP diagnostic tables.

Check for the following conditions:

    • Poor connection at the PCM or Fuel Tank Pressure Sensor
        Inspect harness connectors for backed out terminals, improper mating broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Use a corresponding mating terminal to test for proper terminal tension.
    • Damaged harness
        Inspect the wiring harness for damage. If the harness appears to be OK, observe the Fuel Tank Pressure Sensor display on the scan tool while moving connectors and wiring related to the sensor. A change in the display will indicate the location of the malfunction.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

DTC P0453 Fuel Tank Pressure Sensor Circuit High Voltage

Step

Action

Values

Yes

No

1

Important: If DTC P1635 5 Volt Reference Circuit is also set, perform that diagnostic first.

Was the Powertrain On Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2
  1. Turn ON the ignition, engine not running.
  2. Observe fuel tank pressure sensor voltage on the scan tool.

Is fuel tank pressure sensor voltage more than the specified value?

4.7 V

Go to Step 4

Go to Step 3

3

Important: Continue the diagnosis at step 4 if you were sent here from one of the EVAP diagnostic tables.

  1. Operate the vehicle within the conditions described in Conditions for Setting the DTC.
  2. Monitor Specific DTC info for DTC P0453.

Does the scan tool indicate DTC P0453 failed this ign?

--

Go to Step 4

Go to Diagnostic Aids

4
  1. Disconnect the fuel tank pressure sensor.
  2. Observe the fuel tank pressure sensor voltage displayed on the scan tool.

Is fuel tank pressure sensor voltage near the specified value?

0 V

Go to Step 6

Go to Step 5

5
  1. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Turn ON the ignition.
  4. Check the fuel tank pressure signal circuit for a short to voltage or a short to the 5 volt reference A circuit.
  5. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Was a problem found?

--

Go to Step 11

Go to Step 10

6
  1. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Check the fuel tank pressure sensor ground circuit for a poor terminal connection at the PCM.
  4. If a problem is found, repair as necessary. Refer to Testing for Continuity , Testing for Intermittent Conditions and Poor Connections , Repairing Connector Terminals , Connector Repairs in Wiring Systems.

Was a problem found?

--

Go to Step 11

Go to Step 7

7
  1. Check for an open in the fuel tank pressure sensor ground circuit.
  2. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Was a problem found?

--

Go to Step 11

Go to Step 8

8
  1. Check for poor terminal connections at the fuel tank pressure sensor connector.
  2. If a problem is found, repair as necessary. Refer to Testing for Continuity , Testing for Intermittent Conditions and Poor Connections , Repairing Connector Terminals , Connector Repairs in Wiring Systems.

Was a problem found?

--

Go to Step 11

Go to Step 9

9

Replace the fuel tank pressure sensor. Refer to Fuel Tank Pressure Sensor Replacement .

Is action complete?

--

Go to Step 11

--

10

Important:: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .

Replace the PCM.

Is action complete?

--

Go to Step 11

--

11
  1. Review and record scan tool Failure Records data.
  2. Clear DTCs.
  3. Operate the vehicle within Failure Records conditions.
  4. Monitor Specific DTC info for DTC P0453.

Does the scan tool indicate DTC P0453 failed this ign?

--

Go to Step 4

System OK