Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking for air leakage and the turbocharger (TC) control system
- Check the engine intake system according to intake system/leak test Intake System/Leak Test. Check in particular the charge air pipe and the intake manifold for air leakage
- Release the boost pressure control (BPC) valve according to Checking and adjusting the boost pressure control (BPC) valve on the turbocharger (TC) Adjustments. Check that the boost pressure control (BPC) valve is unimpeded and does not stick in the open position
- Check the turbocharger (TC) according to Checking boost pressure with manometer while test driving the car Checking Boost Pressure With Manometer While Test Driving The Car
- Check the air cleaner (ACL) for blockage
- Remedy as necessary.

Was a fault detected?

Yes - Verification

No - Checking the connectors and components

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Checking the connectors and components








- Ignition off
- Check the mass air flow (MAF) sensor, system relay and control module connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault. In particular, check for any damage
- Remedy as necessary.

Other information
- To access the control module, see Engine control module (ECM), replacing Replacing Engine Control Module (ECM)
- To connect the breakout box, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000
- For information about signals see Signal specification EMS2000.









Select "Continue".

Continue - Checking the component

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Checking the component

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

- Test drive the car with constantly changing throttle opening
- Connect the VIDA station
- Ignition on
- Check whether the status of the diagnostic trouble code (DTC) has changed to intermittent. If the status has changed to intermittent the fault has been remedied.





Has the diagnostic trouble code (DTC) status changed?

Yes - FAULT FOUND

No - Replacing the component

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Replacing the component
- Try a new mass air flow (MAF) sensor. See Replacing the mass air flow (MAF) sensor Service and Repair.





Select "Continue" when the fault has been remedied.

Continue - Verification

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Verification




Verification

Verification

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




- Test drive the car with changing throttle opening and at constant throttle opening. This will ensure that the boost pressure system operates throughout the entire range
- Connect the VIDA station
- Ignition on
- Check if the diagnostic trouble code (DTC) status has changed to intermittent. If it has, the fault has been remedied.





Has the status of the diagnostic trouble code (DTC) status changed?

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 - FAULT-TRACING FAILED

No - Attempt New Test

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Attempt New Test - Checking for air leakage and the turbocharger (TC) control system

FAULT-TRACING FAILED - FAULT-TRACING FAILED

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