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post #1 of 6 (permalink) Old 01-11-2013, 11:22 AM Thread Starter
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Question Fault code 17748

Ok where do I start? A4 2.0lt SE 2001 B6

My o2 sensor has been faulty for a while now to which I replaced the other day. Only thing is and i'm not sure if it matters, I replaced it with a second hand one from a car that had been in a rear end smash however the sensor was working fine prior to removal.

So now I have idle/running issues.
Hot or cold car runs very nicely when MAF is unplugged and very very roughly when plugged in (barely wants to start when cold).
Would suggest that the MAF is faulty Yes?

However the fault code coming up is 17748 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28): Incor. Correlation
P1340 - 001 - Upper Limit Exceeded

Timing marks are spot on Checked double checked and checked again!

So I run the car plugged in the VCDs run the measuring blocks but not sure what I'm looking at, perhaps someone can help explain
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Last edited by acano; 01-12-2013 at 06:29 AM.
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post #2 of 6 (permalink) Old 01-12-2013, 01:26 PM
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The code refers to the ECU sensing the fact that your crankshaft and camshaft are out of time. The ECU says crankshaft and camshafts are out of timing alignment; the rough operation seems to confirm that the ECU is correct.

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post #3 of 6 (permalink) Old 01-12-2013, 07:27 PM Thread Starter
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Originally Posted by mullardel34 View Post
The code refers to the ECU sensing the fact that your crankshaft and camshaft are out of time. The ECU says crankshaft and camshafts are out of timing alignment; the rough operation seems to confirm that the ECU is correct.
When you say rough operation does that suggest there is a timing issue that I have missed?
Or one of the two sensors has failed?

Thanks Tony
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post #4 of 6 (permalink) Old 01-16-2013, 08:38 AM
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No failed sensors; the engine timing is off. Did you have all of the required Audi-specific tools for setting the timing or did you just look at the timing marks? The timing procedure requires Audi-specific locking tools (which can be rented from multiple forum sponsors) to ensure proper timing alignment. If you just visually "eye-balled" the procedure, that's likely where the timing imprecision was introduced which is being noted by the ECU.

---Mullard EL34
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* sport package
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* Continental ExtremeContact DWS (235/40ZR18)
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post #5 of 6 (permalink) Old 01-16-2013, 03:16 PM Thread Starter
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Quote:
Originally Posted by mullardel34 View Post
No failed sensors; the engine timing is off. Did you have all of the required Audi-specific tools for setting the timing or did you just look at the timing marks? The timing procedure requires Audi-specific locking tools (which can be rented from multiple forum sponsors) to ensure proper timing alignment. If you just visually "eye-balled" the procedure, that's likely where the timing imprecision was introduced which is being noted by the ECU.
No just looked at the marks!
I sent the car to a local garage for a new timing belt and water pump. Got it back last night to which he stated timing had been out. All seemed Ok with car on homeward journey, however on start this morning it was a little rough on idle but balanced itself out within a few seconds. No fault codes showing but I think I'll run measuring blocks again and maybe someone can reassess the data?
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post #6 of 6 (permalink) Old 01-18-2013, 10:02 AM Thread Starter
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Ok back from garage car still not running properly so put it back on computer and attached is the measuring block date hopefully someone can tell me what this means
As for special tools I hope he has and isnt wasting my money
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