No boost after engine/turbo upgrade

[UrS4boy]

3B and early UrS4 G40 Hall Sender replacement

Hmm that would explain the kick i was experiencing. Hope you right and it's nothing more sinister. Ordered a new G40 from EFi so a waiting game now. Guess i'll whip out the distributor and strip it down in the mean time.

You saw this:?

http://12v.org/urs/ReplacementOfTheHallSenderInA7A3BandEarlyAANDistributor.pdf

[gmac78]

Do you know anyone with a scope you can put on it? You can see the flywheel and hall on the same screen and see if they look correct. There's pics on here.

No i don't think i know anyone who would have a scope, not used one of these since my college days. Would come in handy now right though!

[gmac78]

You saw this:?

http://12v.org/urs/ReplacementOfTheH...istributor.pdf

I stumbled upon this guide last night, just what i'm looking for, perfect! Bloody good forum this.

[twoqu]

To check whether the hall sender is functioning you would need to remove the dizzy cap to observe the window in the rotor. Essentially they should be nearly 5V when the rotor covers the sender and 0V when the sender is exposed by the window in the rotor. The dizzy connector shoul have ground/earth on pin 1, 12V+ on pin 3 and the signal out from pin 2 to the ecu alternates between 5V and 0V. The values in the real world are close.
The ign will need to be on to get the measurement.

[Error404]

I seem to remember the hall sensor wiring is reversed on the 3B to ABY.

ABY is +12v pin 1, ECU output pin 2, earth pin 3
3B is earth pin 1, ECU output pin 2, +12v pin 3

So perhaps the polarity of the sensor is the opposite of what the ABY ecu needs to see?
A suitable LED across pin 1 + 2 at the hall sensor connector would tell you if/how it is working

[gmac78]

Are we sure about 12v across across 3B Pin1 and Pin 3? I only get 4.99 with ignition on? Hmmm.....

[newsh]

I didn't change any wiring at the hall sender when doing the pin swap on my 3B.

[gmac78]

When you get a chance could you try a multimeter across the Dizzy 3 pin connector with ignition on. I'm intrigued to see would values you get? Perhaps this is my problem all along??

[UrS4boy]

I seem to remember the hall sensor wiring is reversed on the 3B to ABY.

This is AAN (and ABY):





Easy enough to resolve the issue with absolute certainty with the harness connector disconnected from the G40 itself. by looking for continuity between either Pin 1 or Pin 3 and ground. Only the correct on will have continuity.

[twoqu]

Sorry it should be 5V as its referenced from the ecu!

[Error404]

3B schematic:



ABY schematic:

[andy10v]

From my 3b

Pin 1-pin 3 4.99volts
Pin 1-cam cover 5.02v

Pin1-Pin 2
0.11v Hall sensor window closed
4.88v Hall sensor window open

Mine was inverted from the info on SJM, mine was low voltage, then higher voltage at the window open.

Hall sensor is inverted ABY-3B

[Error404]

5v is correct. I mistakenly thought 12v
Had a look, it's fed from pin 12 of ECU on ABY

All irrelevant I guess if John's swap worked fine using his untouched 3B G40

[newsh]

No boost after engine/turbo upgrade

Both the same?

[Error404]

Dammit I can't do this **** on my phone

Edit- there we go, fixed!