Signal Too Low

Signal too low

Checking the component and wiring
Check the signal cable. Check for a short-circuit to ground.
Take readings between:
- Engine Control Module (ECM) #A86 (#B26) and boost pressure sensor #4.

Hint: The diagnostic trouble code (DTC) may be caused by a damaged boost pressure sensor.

Remedy as necessary.

Other information:
- Connecting the breakout box, B5254T7 Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification, Engine Control Module (ECM)
- Temperature and manifold absolute pressure sensor (MAPT), B5254T7 Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Verification

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Verification




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








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off the value from the boost pressure sensor and the atmospheric pressure sensor.
The signal from the atmospheric pressure sensor is used as a reference value in this test.
Check that the boost pressure sensor value is approximately the same as the atmospheric pressure sensor value.





Is the value correct?

Yes - Troubleshooting procedure complete

No - 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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