Signal Missing. Permanent Fault

SIGNAL MISSING. PERMANENT FAULT





Checking Power Cable

- Ignition OFF.
- Disconnect turbocharger (TC) control valve.
- Ignition ON.
- Connect a voltmeter between turbocharger (TC) control valve connector 1 and ground.

The voltmeter should read battery voltage.

If reading is OK:
- Proceed to test step below.

If reading is incorrect:
- Check cable between turbocharger (TC) control valve terminal 1 and main relay (2/32) terminal 3 for an open-circuit.
- Then proceed to Verification section below..





Checking Signal Cable

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

The voltmeter should read approx. 6 Volts.

If reading is OK:
- Proceed to test step below.

If reading is incorrect:
- Proceed to Checking Engine Control Module Connector section below.





Checking Turbocharger 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 approx. 24 Ohms at +20°C (68°F).

If reading is OK:
- 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, contact resistance and oxidation, remedy as needed.
- Then proceed to Verification section below.

If reading is incorrect:
- Try a new turbocharger (TC) control valve.
- Then proceed to Verification section below.





Checking Engine Control Module Connector

- Ignition OFF.
- Turbocharger (TC) control valve disconnected.
- Check engine control module (ECM) connector for contact resistance, oxidation and remedy.
- Engine control module (ECM) connected.
- Ignition ON.
- Connect a voltmeter between turbocharger (TC) control valve connector 2 and ground.

The voltmeter should read 6 Volts.

If reading is OK:
- The diagnostic trouble code (DTC) has been caused by loose connections in the engine control module (ECM) connector.
- Then proceed to Verification section below.

If reading is incorrect:
- Check cable between turbocharger (TC) control valve terminal 2 and engine control module (ECM) #B41 for an open-circuit.
- Then proceed to Verification section below.





Verification

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

- Ignition ON.
- Activate turbocharger (TC) control valve.
- See Activating Components / Functions section.
- A clicking sound should be heard from the turbocharger (TC) control valve when it is activated.

Is the turbocharger (TC) control valve working?

Yes:
- Fault corrected

No:
- Proceed to test step below.

Fault-Tracing Information

- The verification result shows that the fault persists.
- Do you want to exit fault-tracing?

Yes:
- Fault not corrected

No:
- Return to Checking Power Cable section above.