On-board computer and data collection question
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On-board computer and data collection question
When I was getting my regular service done on my 00' A4 1.8TQ the service guy told me that the computer spit out a data that the car encountered "rough road conditions". He also said that an air-bag warning went off. Does anyone know what kind of information the computer collects about your driving and the conditions that the car encounters? How does it determine that the car encountered "rough road conditions"? Are there sensors and if so where are they? I do remember bottoming out once. Perhaps that's when the air-bag warning bit was set.
Does anyone know about any on-line documentation on this subject?
Does anyone know about any on-line documentation on this subject?
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Here is a quote from the factory manual . . .
It's gibberish, but here is a paste up:
"Rough road signal from ABS/EDL control module, checking
Notes:
When the ABS/EDL control module senses a wheel spinning, it produces the rough road signal. When the ECM recognizes the rough road signal, the misfire recognition is switched off.
Check the rough road signal only when the trouble code 18014 "Rough Road Spec Engine Torque ABS-ECU Electrical Malfunction" is stored. The "Misfire" malfunction is in this case a subsequent malfunction that can be disregarded.
The wiring and the rough road signal are monitored by the ECM.
Emissions testing on a front-wheel drive vehicle with ABS/EDL, during which only the front wheels turn while the rear wheels are stationary, can result in the DTC 18014 being stored in DTC memory. Therefore, the fuse for the ABS/EDL control module must be removed. After the test, check DTC memory for the ABS/EDL control module and the ECM. Then erase DTC memory.
Required special tools and test equipment
VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
VAG 1598/22 test box "
Phew
"Rough road signal from ABS/EDL control module, checking
Notes:
When the ABS/EDL control module senses a wheel spinning, it produces the rough road signal. When the ECM recognizes the rough road signal, the misfire recognition is switched off.
Check the rough road signal only when the trouble code 18014 "Rough Road Spec Engine Torque ABS-ECU Electrical Malfunction" is stored. The "Misfire" malfunction is in this case a subsequent malfunction that can be disregarded.
The wiring and the rough road signal are monitored by the ECM.
Emissions testing on a front-wheel drive vehicle with ABS/EDL, during which only the front wheels turn while the rear wheels are stationary, can result in the DTC 18014 being stored in DTC memory. Therefore, the fuse for the ABS/EDL control module must be removed. After the test, check DTC memory for the ABS/EDL control module and the ECM. Then erase DTC memory.
Required special tools and test equipment
VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
VAG 1598/22 test box "
Phew
New Member
Joined: Apr 2000
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Re: Here is a quote from the factory manual . . .
Gibberish indeed. I believe that one of the OBDII things is that the ECU has to count up misfires. I think it measures micro-accelerations of the crankshaft to do this. With a manual transmission, rough roads can "feedback" into the crank.
I remember an article in Car and Driver stating that this was one of the reasons that so many cars are no longer offered with a manual transmission.
The same article stated that the SAAB ignition system that measure misfires directly was the way to go but was deemed to expensive by GM et al.
I remember an article in Car and Driver stating that this was one of the reasons that so many cars are no longer offered with a manual transmission.
The same article stated that the SAAB ignition system that measure misfires directly was the way to go but was deemed to expensive by GM et al.
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