P0339 2004 Honda Civic - Makes no sense

Asked by Nov 11, 2016 at 02:28 PM about the 2004 Honda Civic DX

Question type: Maintenance & Repair

2004 Honda Civic is throwing P0339 intermittent Crankshaft position 'A'
code.  I've replaced the sensor 2 times, and have a spare ECU.  Nothing is
fixing the problem.  So, I've bypassed the Blue wire on Connector 'A' Pin 7
with a straight wire from the sensor... still P0339 code.  

Put an Oscilloscope on the sensor alone... it's pulsing fine, with a 100ms
gap every 12 pulses with 42 ms pulses on the other 11.  
I'm getting the same with the scope on the bypass wire connected straight
into the ECU.  But it's still throwing the code.

The car will start into Limp Mode with original ECU after about 10 seconds
and the CEL light goes on.  Spare ECU will not go into LIMP mode at all,
but does report P0339....

I'm just lost as to why still getting the P0339 with obvious good signal into
the ECU (unless someone can confirm this is not the correct pulse train).  
After a month with the car down... it's hurting!

5 Answers

115,025

Did you check to see if the Signal plate may be damage?

115,025

you may want to also check that the Starter motor may be faulty, check Starting system circuit and possible weak battery

Battery is fine, starter doesn't seem to show any issues since it cranks without a problem. I don't know where the signal plate is, or what it is... but will google it. I can say the relays (blue, and brown) were also replaced. But the other 2 (both black were not). After clearing the CEL light, I'm not sure if after turning the key is should go out after a few seconds before cranking... but it stays lit. So I don't see the starter as part of the problem (obviously can't rule anything out at this point... but it shows no sign of issue) Will look into the signal plate.

Also want to add... the scope is showing the signal train as 5v p-p, so apparently it is in spec. There is no noise in the signal or random missing of 100 ms pulses (at idle). I didn't find anything online about a signal plate... if you have more information, that would be great.

115,025

this will help, copy and paste/https://www.youtube.com/watch?v=V13pdAIQAik

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