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Thread: Air intake temperature fault and limited boost errors.

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  1. Air intake temperature fault and limited boost errors. 
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    I have an allroad 2.5 tdi bau engine. I recently had an ecu light come on. The fault code 17569 G72 p1161 manifold temp sensor open or short to plus. I tried a second hand maf with no joy so ordered a new one as it didn't resolve this fault. The car was still driving but developed an other fault where it would not boost. I have a generic obd code of p0299 turbo under boost. This will sometimes reset it self but other times needs me to stop and turn the ignition off. This occurs when I am under load or trying to overtake on the motor way so isn't ideal. I bought a new maf and stuck that on this morning confident that would resolve it but it's getting worse. I have been using a little obd reader with my phone to reset errors as I go with little results. The last couple of days it has thrown up an egr fault error also. I can't remember what the code was for this.

    I have yet to do a detailed investigation as my elsawin wiring diagrams are playing up. Can anyone suggest what to start with before I start pulling things apart. Am I right in saying that the air temperature sensor is built in to the maf.

    Can anyone help me to try and diagnose this.


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  2. Re: Air intake temperature fault and limited boost errors. 
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    Check the electrical plug of the G70-G72. ( detached wire or corrosion)
     
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  3. Re: Air intake temperature fault and limited boost errors. 
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    An update on my progress. I have found the wiring diagrams online and done continuity checks from the 4 wires that lead back to the ecu and the fifth that is a 12v feed. All of these are good. I notice that the live feed to the sensor is feeding multiple units. Could one of these drag down the live feed. Does the intake temperature sensor use this feed as there are only 2 wires that go Straight back to the ecu. Could the ecu be faulty? I am always skeptical of faults in the ecu unless someone has been messing around and shorted something out. It's normally a wiring or sensor fault but I have checked these.


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