Signal Missing. Permanent Fault

Signal missing. Permanent fault

EFI-242 Turbocharger (TC) control valve, signal.

Checking power cable








- Ignition off.
- Disconnect turbocharger (TC) control valve.
- Ignition on.
Connect a voltmeter between turbocharger (TC) control valve connector terminal 1 and ground.









The voltmeter should read battery voltage.

OK - Checking the signal cable

Not OK - Checking for an open-circuit

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Checking for an open-circuit








- Check cable between turbocharger (TC) control valve terminal 1 and main relay (2/32) terminal 3 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Verification

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Checking the signal cable








- Ignition on.
- Turbocharger (TC) control valve disconnected.
Connect a voltmeter between turbocharger (TC) control valve connector terminal 2 and ground.









The voltmeter should read approximately 6 V.

OK - Checking turbocharger (TC) control valve

Not OK - Checking control module connector

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Checking turbocharger (TC) control valve








- Ignition off.
- Turbocharger (TC) control valve disconnected.
Connect an ohmmeter between turbocharger (TC) control valve connector terminals 1 and 2.









The ohmmeter should read approximately 24 ohms at +20°C.

OK - Checking for contact resistance and oxidation

Not OK - Replacing component

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Checking for contact resistance and oxidation
The cause of the diagnostic trouble code (DTC) has been loose connections in the turbocharger (TC) control valve and/or the engine control module (ECM) connectors.
- Check the connectors for loose connections and remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Verification

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Replacing component
- Try a new turbocharger (TC) control valve.

Continue - Verification

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Checking control module connector












- Ignition off.
- Turbocharger (TC) control valve disconnected.
- 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.
- Control module connected.
- Ignition on.
Connect a voltmeter between turbocharger (TC) control valve connector terminal 2 and ground.









The voltmeter should read 6 V.

OK - Fault-tracing information

Not OK - Checking for an open-circuit

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Fault-tracing information
The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.

Continue - FAULT FOUND

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Checking for an open-circuit








- Check cable between turbocharger (TC) control valve terminal 2 and engine control module (ECM) #B41 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.





Continue - Verification

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Verification




Verification

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




- Ignition on.




- Select Volvo Scan Tool (ST) to activate turbocharger (TC) control valve.
- A clicking sound should be heard from the turbocharger (TC) control valve when it is activated.

Is the turbocharger (TC) control valve working?

Yes - VERIFIED

No - 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 power cable

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