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Skoda octavia 1.9 tdi BXE / P0322 G28

1
Hello

I need some help and advices

Car : Skoda octavia 1.9 tdi BXE engine from 2006

Car have a lot of difficulty to start and tachometer revs don't work
From time to time, it's start normally but engine shut off 2mn later

DTC : P0322 : Engine Speed Sensor (G28): No Signal

We first check all wiring and checked continuity beetween g28 sensor and ecu plug
Also resistane between pin 1 and 3 are ok
Fuse relay all ok

We replaced this sensor by a new one, same problem

Next step it's to remove gearbox and change magnetic target related to this G28

Anybody had similar problem ?

Thanks for our help
[Image: 181027104741953479.jpg]
Thanks given by:
2
May be 3 things:
1. Loosing contact in the connector of G28(try to change pins)
2. Still problem in wiring(make new wiring from G28 to ECU)
3. New G28 defective
______________________________________
Looking for an employer from Canada or USA. I'm the diagnostician with the big experience and retrofitting Vag.
Please THANKS and REP if my post helped Nod
Thanks given by: Tschill
3
(05-30-2018, 02:38 PM)DobruyZluden Wrote: May be 3 things:
1. Loosing contact in the connector of G28(try to change pins)
2. Still problem in wiring(make new wiring from G28 to ECU)
3. New G28 defective

hi mate

thank for feedback

1. We changed connector by another one, forgot to mention

2. Continuity is ok beetween g28 sensor and ecu plug, but we can try to make new wiring (3 wire) to ecu

3. New defective g28, possible
[Image: 181027104741953479.jpg]
Thanks given by:
4
i have that problem with a car that came from other service. they change the sensor ..wiring...ecu....cranckshaft sealant...and same problem. but the change the sensor with the wrong one. the sensors look the same but they are different. one sensor is for magnetic sealant and the other is for the metal plate with holes. you can check with the phone witch one you have with app for finding magnetic fields. the one sensor have magnet in it the other don't.
Thanks given by: Tschill
5
(05-30-2018, 03:18 PM)loki954 Wrote: i have that problem with a car that came from other service. they change the sensor ..wiring...ecu....cranckshaft sealant...and same problem. but the change the sensor with the wrong one. the sensors look the same but they are different. one sensor is for magnetic sealant and the other is for the metal plate with holes. you can check with the phone witch one you have with app for finding magnetic fields. the one sensor have magnet in it the other don't.

Thanks bro will compare magnetic fields from old and new one
I ordered from dealer related to VIN, but have to check to be sure
[Image: 181027104741953479.jpg]
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6
Did you check the signal with an oscilloscope?
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7
(05-30-2018, 05:05 PM)kimmy Wrote: Did you check the signal with an oscilloscope?

Unfortunately not, I do not have oscilloscope
Can borrow one, but not familiar to use..
[Image: 181027104741953479.jpg]
Thanks given by:
8
ECU may not process signal from rpm sensor due to interference in the signal line (poor connection, ground, contact corrosion... etc). It is necessary to verify signal on the unit plug.

As an oscillograph you can use the microphone input to the sound card (not to "burn" the built-in sound - use a cheap USB card). The input is best decoupled via an optical pair or connected in series through a resistor. Via sound recording app you can see signal diagram.

If there is no signal at all - there is a problem in the sensor or magnetic tag. If there is a signal - maybe have burnt out electrical componet on this pin (on pcb inside ecu).
If helped hit +Thanks and +Reputation" button 79
Thanks given by: Tschill
9
Wired 3 cable direct from sensor to ecu
Same problem..

I checked old sensor with magnetic field app...nothing
Do not checked the new one..

dealer sell me this reference : 03906433E seems to be the correct one for 1.9 tdi bxe engine
[Image: 181027104741953479.jpg]
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