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YOUR RESEARCHOBD error code, advice please
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Check today
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Read evidence and context
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Suggestion · Original poster
I was hoping there might be something I could check before digging it to procedure Porsche recommended for this OBD code.
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Suggestion · Original poster
I'll check the live values when I have the car all warmed up.
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Suggestion
You can check the MAF reading using Durametric or a generic OBDII scanner that reads sensor values in real-time.
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Suggestion
However, you HAVE to disconnect the battery, unplug the DME, and the MAF before measuring the resistance of any wires between the DME harness and the MAF.
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I got a check engine light yesterday and as it turns out, my durametric (clone) cable just gives me a red light so I can't connect it. But I picked up a code reader from Harbor Freight today.
I get the following codes:
P0102
P0446
Any idea on where to start? Anyone experienced these? The car starts and runs like it always did
leave car or drive car while figuring this out?
P0102 is MAF. Check MAF connection
http://www.renntech.org/forums/topic...ank-vent-leak/
p0446 is evap canister purge valve
http://www.renntech.org/forums/topic...-car-shutdown/
I suggest resetting the codes and wait for the CEL to come on again and rescan it, preferably by Durametric or alike.
It has in fact been hard to start sometimes. Cranks a few extra times before starting and occasionally it doesn't start and I have to wait a minute to try again.
I was hoping there might be something I could check before digging it to procedure Porsche recommended for this OBD code.
Here's what the Porsche OBD manual says. Just dig into it I guess? Can I get around not having the special tool?
P0102
P0446
You can check the MAF reading using Durametric or a generic OBDII scanner that reads sensor values in real-time. At idle full warmed up it should read about 15-17kg/hr. At 3k rpm, it should be around 60-80kg/hr.
When engine is not fully warmed up, the idle will be higher so it's hard to use as a baseline. As long as your numbers are fine for a fully warmed up engine, you should be fine.
The numbers I posted were for normal warned up idle, which is about 700rpm. You cold idle is higher hence also higher MAF reading. Higher rpm sucks in more air.
Um, your warmed up idle is WAY high. It should be around 700rpm. What year is your car? I wonder if you have some air leak.
6.45 g/s sounds quite high for 822 rpm. It should be about 3.8 at 700rpm and goes up linearly off idle.
Check the purge canister valve, my bet is it is stuck open. Mine was like that and it caused hard warm start, high idle and a few other small problems. If yours is like my '99, this valve is left to the throttle body. Remove it, clean it, cycle it a few times with a cordless drill battery, blow in it to see if its working. If it does, re install it.
The numbers look good. How about at 3k rpm? It should read about 19g/s. If that's also correct, I suggest you clean the MAF like Kalasnikov said. After that would be following the Porsche diagnostic to check for wiring issues. You don't need the special DME breakout tool, which just makes it convenient and prevent you from shorting or measuring other pins by mistake.
However, you HAVE to disconnect the battery, unplug the DME, and the MAF before measuring the resistance of any wires between the DME harness and the MAF.
Thanks Ahsai. I forgot to check at 3K rpm but I'll do that tomorrow. I cleared the codes and they haven't come back yet so I'll wait with the measuring for now.
BTW, the P0102 code is complaining that the MAF signal is lower than expected. The signal strength is proportional to the amount of air sucked in. MAF doesn't affect engine control much until the revs are higher (so it has almost no effects at idle). Reduced signal could be because you have a wire break (could be intermittent) between the DME and the sensor. Or that signal wire is shorted to the ground. That's what the diagnostic steps are asking you to verify.
