PicoScope 7 Automotive
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Audi S2 Coupe Turbo '92 Motronic 2.3.2
Audi S2 Coupe Turbo '92 Motronic 2.3.2
Hi Folks.
I m New to Oscilloscope usage, but not a 100% Noob... but still..
I have now a Audi S2 Coupe, from 1992 5 Cyl Turbo AAN... and trying to figure out why she wont start..
I tried now to sense the CRP an CSP Sensors... both sensors are same (the one with 2 sensors on Flywheel)
Sensor1 will sense the tooth of the flywheel, i get a proper sinus but only around 250-260 mV
Sensor2 will sense a magnetic puk in the flywheel, for ignition timing and i have a single sinus every 360°, where i get a signal out of around 4V, which looks more or less correct to me.
But completely unsure about the 250mV signal...even if the wave looks pretty right...i assume the signal should be higher...but i never worked before on those sensors (old fashioned sensors)
For the initial Ignition, this particular one has instead of a distributor, the Hallsensor in the place of the Ignition distributor, but with no distributior housing... just a blank cover...The Hall Signal also looks pretty right.
If anyone could confirm or denie the 240mV signal from tooth reading for this '92 Audi would be great.
Thx in advance. Sandro
I m New to Oscilloscope usage, but not a 100% Noob... but still..
I have now a Audi S2 Coupe, from 1992 5 Cyl Turbo AAN... and trying to figure out why she wont start..
I tried now to sense the CRP an CSP Sensors... both sensors are same (the one with 2 sensors on Flywheel)
Sensor1 will sense the tooth of the flywheel, i get a proper sinus but only around 250-260 mV
Sensor2 will sense a magnetic puk in the flywheel, for ignition timing and i have a single sinus every 360°, where i get a signal out of around 4V, which looks more or less correct to me.
But completely unsure about the 250mV signal...even if the wave looks pretty right...i assume the signal should be higher...but i never worked before on those sensors (old fashioned sensors)
For the initial Ignition, this particular one has instead of a distributor, the Hallsensor in the place of the Ignition distributor, but with no distributior housing... just a blank cover...The Hall Signal also looks pretty right.
If anyone could confirm or denie the 240mV signal from tooth reading for this '92 Audi would be great.
Thx in advance. Sandro
Re: Audi S2 Coupe Turbo '92 Motronic 2.3.2
Here is a Screenshot, and the pico log.
From CH-B i have a signal around 218mV to -206mV in average 425mV, would that be OK, or is this Inductive Sensor to be replaced?
Best regards. Sandro
From CH-B i have a signal around 218mV to -206mV in average 425mV, would that be OK, or is this Inductive Sensor to be replaced?
Best regards. Sandro
- Attachments
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- zündgeber_drehzahlgeber_ruler 360°.psdata
- psdata
- (20.22 KiB) Downloaded 225 times
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- screenshot
Re: Audi S2 Coupe Turbo '92 Motronic 2.3.2
Looks pretty small voltage to me as well. Is the sensor gap correct? Is this genuine sensor or aftermaket?
Re: Audi S2 Coupe Turbo '92 Motronic 2.3.2
The airgap is correct.
Between 0.6 and 0.9mm, specs are
0.5 to 1.25mm
Measured between mounting point and teeth, on 4 places, rotating crank 90° between each measurment.
Sensors arent oem, but Hella, which should be the actual best choice for those engines...
The engine ran fine with these sensors for few years...
But gonna test with 2 new ones...
Between 0.6 and 0.9mm, specs are
0.5 to 1.25mm
Measured between mounting point and teeth, on 4 places, rotating crank 90° between each measurment.
Sensors arent oem, but Hella, which should be the actual best choice for those engines...
The engine ran fine with these sensors for few years...
But gonna test with 2 new ones...
Re: Audi S2 Coupe Turbo '92 Motronic 2.3.2
Good news Poeple.
Engine is back to life, and 115mV for the G28 Sensor seems being OK...
Found a brocken Ground wire in the loom....which i suppose to be the issue... in attach, the same log with running engine...and as rpm are higher...also voltage is higher from induction sensor
Engine is back to life, and 115mV for the G28 Sensor seems being OK...
Found a brocken Ground wire in the loom....which i suppose to be the issue... in attach, the same log with running engine...and as rpm are higher...also voltage is higher from induction sensor
- Attachments
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Re: Audi S2 Coupe Turbo '92 Motronic 2.3.2
May I suggest DC coupling of channels and not AC?
Re: Audi S2 Coupe Turbo '92 Motronic 2.3.2
Why DC? Theyre Inductive Pickups...hence an AC will be induced...or am i wrong?
Re: Audi S2 Coupe Turbo '92 Motronic 2.3.2
By no means an expert here but you’re wrong.
You want to see what the ecu sees, so why removing the dc component with the oscilloscope. You basically kind of take some details out.
In automotive, you hardly need to ac couple. I never use it.
You want to see what the ecu sees, so why removing the dc component with the oscilloscope. You basically kind of take some details out.
In automotive, you hardly need to ac couple. I never use it.