Signal Sporadic. Permanent Fault

Signal sporadic. Permanent fault

EFI-621 Fuel tank pressure sensor, signal

Identification
First read Identifying cars constructed according to ORVR Application and ID.

Is the car constructed according to ORVR?

Yes - Safety

No - Signal sporadic: Permanent fault

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Signal sporadic: Permanent fault

EFI-621 Fuel tank pressure sensor, signal

Checking diagnostic trouble codes (DTCs)

- Ignition off.
- Check fuel tank pressure sensor connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check control module connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check connector 24/2 and 24/4 for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Fuel tank pressure sensor connected
- Control module connected.
- Start the engine and idle it.
- Wait 5 minutes.

- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

OK - Fault-tracing information

Not OK - Checking cables and terminals

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Fault-tracing information
- The diagnostic trouble code (DTC) has been caused by poor contact in the fuel tank pressure sensor and/or engine control module (ECM) connectors.

Continue - Verification

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Checking cables and terminals

- Check fuel tank pressure sensor and/or engine control module (ECM) connector for loose connections according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check cable between fuel tank pressure sensor terminal 1 and engine control module (ECM) #B29 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check the cable between atmospheric pressure sensor terminal 3 and engine control module (ECM) #B22 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check cable between fuel tank pressure sensor terminal 2 and engine control module (ECM) #B28 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- The fuel tank pressure sensor power cable is connected inside the engine control module (ECM) to the air conditioning (A/C) pressure sensor, fuel tank pressure sensor and accelerometer power cables.
If anything happens to any of these cables all four will be affected.
Check cables between:
- air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29.
- atmospheric pressure sensor terminal 1 and engine control module (ECM) #B15
- accelerometer terminal 1 and engine control module (ECM) #B1
for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and an intermittent short-circuit to ground Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Reinstall all components.
- Start the engine and idle it.
- Wait 5 minutes.

- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

OK - Verification

Not OK - Checking the air conditioning (A/C) pressure sensor

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Checking the air conditioning (A/C) pressure sensor

- Ignition off.
- Fuel tank pressure sensor connected
- Disconnect air conditioning (A/C) pressure sensor.

Hint: Diagnostic trouble codes (DTCs) may be stored for the air conditioning (A/C) pressure sensor; erase codes when fault-tracing is completed.

- Start the engine and idle it.
- Wait 5 minutes.

- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

OK - Replacing component

Not OK - Checking accelerometer

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Replacing component
- Try a new air conditioning (A/C) pressure sensor.

Select "Continue" when the fault has been repaired.

Continue - Verification

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Checking accelerometer

- Ignition off.
- Fuel tank pressure sensor connected
- Connect air conditioning (A/C) pressure sensor.
- Disconnect accelerometer.

Hint: Diagnostic trouble codes (DTCs) may be stored for the accelerometer; erase codes when fault-tracing is completed.

- Start the engine and idle it.
- Wait 5 minutes.

- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

OK - Replacing component

Not OK - Checking atmospheric pressure sensor

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Replacing component
- Try a new accelerometer.

Select "Continue" when the fault has been repaired.

Continue - Verification

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Checking atmospheric pressure sensor

- Ignition off.
- Fuel tank pressure sensor connected
- Connect the accelerometer.
- Disconnect atmospheric pressure sensor.

Hint: Diagnostic trouble codes (DTCs) may be stored for the atmospheric pressure sensor; erase codes when fault-tracing is completed.

- Start the engine and idle it.
- Wait 5 minutes.

- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

OK - Replacing component

Not OK - Replacing component

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Replacing component
- Try a new accelerometer.

Select "Continue" when the fault has been repaired.

Continue - Verification

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Replacing component
- Try a new atmospheric pressure sensor.

Select "Continue" when the fault has been repaired.

Continue - Verification

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Replacing component
- Try a new air conditioning (A/C) pressure sensor.

Continue - Verification

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Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied as follows:

- Ignition off.
- Reconnect connectors and reinstall components.
- Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
- Test drive the car.
- Use the Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If EFI-621 is stored it should have intermittent status.

OK - VERIFIED

Not OK - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking diagnostic trouble codes (DTCs)

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Safety
First read Safety regulations for handling fuel Safety Regulations For Handling Fuel.

Continue - Checking diagnostic trouble codes (DTCs)

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Checking diagnostic trouble codes (DTCs)

- Ignition off.
- Check fuel tank pressure sensor connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check control module connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check connectors 24/2 and 24/4 for contact resistance and oxidation and remedy. Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Fuel tank pressure sensor connected.
- Control module connected.
- Start the engine and let it idle.
- Wait 5 minutes.

- Select Volvo System Tester to read off any diagnostic trouble codes (DTCs)

If diagnostic trouble code (DTC) EFI-621 is stored it should have intermittent status.

OK - Fault-tracing information
Verification

Not OK - Checking cables and terminals

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Fault-tracing information
- The cause of the diagnostic trouble code (DTC) has been loose connections in the fuel tank pressure sensor and/or the control module connectors.

Continue - Verification

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Checking cables and terminals

- Check fuel tank pressure sensor and/or control module connector for loose connections. Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check cable between fuel tank pressure sensor terminal 3 and control module #B15 for an intermittent open-circuit. Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Intermittent short-circuit to ground. Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and an intermittent short-circuit to supply voltage. Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check cable between fuel tank pressure sensor terminal 2 and control module #B31 for an intermittent open-circuit. Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Intermittent short-circuit to ground. Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and an intermittent short-circuit to supply voltage. Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Check cable between fuel tank pressure sensor terminal 1 and control module #B28 for an intermittent open-circuit. Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- The fuel tank pressure sensor power cable is connected inside the engine control module (ECM) to the air conditioning (A/C) pressure sensor, atmospheric pressure sensor and accelerometer power cables.
If anything happens to any of these cables all four will be affected.
Check cables between:
- air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29
- atmospheric pressure sensor terminal 1 and engine control module (ECM) #B15
- accelerometer terminal 1 and engine control module (ECM) #B1
for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and an intermittent short-circuit to ground. Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
- Reinstall all components.
- Start the engine and let it idle.
- Wait 5 minutes.

- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If diagnostic trouble code (DTC) EFI-621 is stored it should have intermittent status.

OK - Verification

Not OK - Checking the air conditioning (A/C) pressure sensor

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Checking the air conditioning (A/C) pressure sensor

- Ignition off.
- Fuel tank pressure sensor connected.
- Disconnect air conditioning (A/C) pressure sensor.

Hint: Diagnostic trouble codes (DTCs) may be stored for the air conditioning (A/C) pressure sensor. Erase codes when fault-tracing is completed.

- Start the engine and let it idle.
- Wait 5 minutes.

- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If diagnostic trouble code (DTC) EFI-621 is stored it should have intermittent status.

OK - Replacing component

Not OK - Checking accelerometer

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Replacing component
Try a new air conditioning (A/C) pressure sensor.

Continue - Verification

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Checking accelerometer

- Ignition off.
- Fuel tank pressure sensor connected.
- Connect air conditioning (A/C) pressure sensor.
- Disconnect accelerometer.

Hint: Diagnostic trouble codes (DTCs) may be stored for the accelerometer. Erase codes when fault-tracing is completed.

- Start the engine and let it idle.
- Wait 5 minutes.

- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If diagnostic trouble code (DTC) EFI-621 is stored it should have intermittent status.

OK - Replacing component

Not OK - Checking atmospheric pressure sensor

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Replacing component
Try a new accelerometer.

Select Continue when the fault has been remedied.

Continue - Verification

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Checking atmospheric pressure sensor

- Ignition off.
- Fuel tank pressure sensor connected.
- Connect the accelerometer.
- Disconnect atmospheric pressure sensor.

Hint: Diagnostic trouble codes (DTCs) may be stored for the atmospheric pressure sensor; erase codes when fault-tracing is completed.

- Start the engine and let it idle.
- Wait 5 minutes.

- Select Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).

If diagnostic trouble code (DTC) EFI-621 is stored it should have intermittent status.

OK - Replacing component

Not OK - Replacing component

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Replacing component
Try a new atmospheric pressure sensor.

Select Continue when the fault has been remedied.

Continue - Verification

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Replacing component
Try a new fuel tank pressure sensor according to Replacing fuel tank pressure sensor Removal and Replacement.

Select Continue when the fault has been remedied.

Continue - Verification

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Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied as follows:

- Ignition off.
- Reconnect connectors and reinstall components.
- Disconnect the Volvo Scan Tool (ST) from the VIDA station and use it in stand-alone mode.
- Test drive the car.
- Use Volvo Scan Tool (ST) to read off diagnostic trouble codes (DTCs).