Signal Too Low

Signal too low

Checking the wiring and component

Hint: The intake air temperature (IAT) sensor is integrated in the boost pressure sensor.

- Check the boost pressure sensor connector. Check for contact resistance and oxidation.
Check the intake air temperature (IAT) sensor between terminals #1 and #2 (sensor side). Check the resistance.
Check the signal cable between control module terminal #A87 (#B27) and boost pressure sensor terminal #2. Check for a short-circuit to supply voltage. Check for an open-circuit.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- Component specifications, B5254T7 [1][2]Engine Control Module
- 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




Verification

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








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Ignition on.
Read off the intake air temperature (IAT).





Is the temperature within its permitted range?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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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 the wiring and component

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