GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 DTC 🢒 DTC P0453 Fuel Tank Pressure Sensor Circuit High Voltage

Object Number: 603358 Size: MF
Engine Controls Components
Sensors
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The fuel tank pressure sensor measures the pressure (or vacuum) in the fuel tank. The PCM provides the sensor with a reference voltage, a signal circuit, and a ground. The sensor returns a signal voltage to the PCM relative to the pressure in the fuel tank. The PCM should see a signal voltage increase as the pressure in the tank decreases (more vacuum). As the pressure in the tank increases (less vacuum), the PCM should see a signal voltage decrease. The PCM uses the sensor signal to test the integrity of the EVAP system. If the PCM detects a signal voltage that is too high, DTC P0453 will set.

Conditions for Running the DTC

The ignition is on.

Conditions for Setting the DTC

The fuel tank pressure sensor voltage is more than 4.9 volts for at least 1 second.

Action Taken When the DTC Sets
    • The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test runs and fails.
    • The PCM will store the conditions present when the DTC set as Freeze Frame and Fail Records data.
    • The PCM will disable the EVAP system.

Conditions for Clearing the MIL/DTC
    • The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes.
    • 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 DTC Information function.

Diagnostic Aids

If the condition is intermittent, refer to Intermittent Conditions .

Test Description

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

  1. This step attempts to duplicate the condition.

Step

Action

Values

Yes

No

1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check ?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

Is DTC P1639 also set?

--

Go to DTC P1639 5 Volt Reference 2 Circuit

Go to Step 3

3

Is DTC P0463 also set?

--

Go to Step 4

Go to Step 6

4
  1. Turn OFF the ignition.
  2. Disconnect the FTP sensor connector.
  3. Connect test lamp between B+ and the FTP sensor ground circuit.
  4. Turn ON the ignition.

Is the test lamp ON?

--

Go to Step 11

Go to Step 5

5
  1. Turn OFF the ignition.
  2. Disconnect the PCM connector.
  3. Leave the FTP sensor connector disconnected.
  4. Test the FTP sensor ground circuit for an open or poor connections at the PCM. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 12

6
  1. Turn ON the ignition with the engine OFF.
  2. Observe the fuel tank pressure display on the scan tool.

Does the scan tool indicate a fuel tank pressure above the specified value?

4.7V

Go to Step 8

Go to Step 7

7

  1. Review and record the scan tool Fail Records information.
  2. Operate the vehicle within the Fail Records conditions.
  3. Monitor the scan tool Specific DTC Information for DTC P0453 until the test runs.

Does the scan tool indicate that DTC P0453 failed last test?

--

Go to Step 8

Go to Diagnostic Aids

8
  1. Turn OFF the ignition.
  2. Disconnect the fuel tank pressure sensor connector.
  3. Turn ON the ignition with the engine OFF.
  4. Observe the fuel tank pressure sensor voltage display on the scan tool.

Does the scan tool indicate a fuel tank pressure sensor voltage near the specified value?

0V

Go to Step 11

Go to Step 9

9
  1. Test for a short between the fuel tank pressure sensor signal circuit and the 5V reference B circuit.
  2. If the condition is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 12

10
  1. Test for poor terminal connections at the fuel tank pressure sensor.
  2. If the condition is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 8

11

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

Is the action complete?

--

Go to Step 13

--

12

Important: The replacement PCM must be programmed.

Replace the PCM. Refer to Powertrain Control Module Replacement/Programming .

Is the action complete?

--

Go to Step 10

--

13
  1. Review and record the Fail Records information.
  2. Clear the DTCs.
  3. Operate the vehicle within the Fail Records conditions.
  4. Monitor the scan tool Specific DTC Information for DTC P0453 until the test runs.

Does the scan tool indicate that DTC P0453 failed this ignition?

--

Go to Step 2

System OK