18000 - Altitude Sensor / Boost Pressure Sensor P1592 - 35-00 - Implausible Correlation 17564 - Manifold Pressure Sensor (G71) P1156 - 35-10 - Open/Sh

[ianlovatt]

Car's gone into limp mode and the following fault codes have appeared since the work carried out by the garage in this thread
https://www.vwaudiforum.co.uk/forum/showthread.php/195535-Coolant-leak-what-is-part-this-called-and-is-it-realistic-for-me-to-attempt-to-fix/page2

18000 - Altitude Sensor / Boost Pressure Sensor
P1592 - 35-00 - Implausible Correlation
17564 - Manifold Pressure Sensor (G71)
P1156 - 35-10 - Open/Short to Ground - Intermittent
(full scan attached)

I think the G71 sensor is one the garage will have had to disconnect when changing the flange in the thread mentioned above

This same MAP sensor also seems to be referred to as boost pressure sensor or G31?

I'm not sure what to make of the boost pressure implausible correlation error - looked it up on the ross-tech wiki
18000/P1592/005522 - Ross-Tech Wiki

and the 17564/p1156 didn't seem to have an entry? only found this forum mention it?
https://forums.ross-tech.com/showthread.php?22158-VW-POLO-2004-multiple-engine-fault-codes

Car's booked in to go back to the garage that did the coolant flange on Tuesday so I guess I shouldn't use VCDS to to clear the codes before then.

Picture of MAP
Shared album - ian lovatt - Google Photos

I've been doing some digging around on here and on youtube and realised you can test the MAP by measuring the voltages as in here Vw Diesel P1156 Map sensor - YouTube

At the moment when probing the connector on the loom side with the ignition on I have
1 (Brown) ground
2 +5V
3 +5V
4 0V (as this is the signal fed back to the ECU that seems to make sense to me)

I didn't have time to try varying the pressure and seeing what values change in VCDS which would confirm the signal on pin 4 is ok

another thread on this topic
https://www.vwaudiforum.co.uk/forum/s...e-Sensor-(G71)

Cheers,
Ian