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Old 12-17-2004, 11:17 PM   #1
elhalisf
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Default 03 engine w/ 04 ECU in 04 WRX, lack of Blow By Sensor causing CEL? P1491

Hey guys,

I have had this CEL (p1491) for 6 months now ever since I bought this 04 WRX and swapped an 03 wrx engine in it. I still have the original 04 ECU in it and it has been running fine. Its running Cobb Stage 2 pretty strong.

I am trying to get rid of the annoying things in my car and this damn orange light is starting to get to me.

P1491 POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION PROBLEM

Now according to some research and reading on this forum, I found out that the 04 engine had this sensor (Blow by sensor), but the 03 engine did not. So I am assuming from this information that I have a plug that isnt exactly attached anywhere at this point since I have the 04 harness, but this is not the case. I didnt seem to find any loose wires or plugs around the intake manifold area where I am assuming the sensor should be.

Is this CEL as a result of running an 04 ECU with an 03 engine, or am I in fact missing a sensor somewhere? Where should I look for a loose plug, and what kind of resistor can block this CEL if any? Appreciate the help guys
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Old 12-18-2004, 12:51 AM   #2
DrD
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ok - so there is a pcv diagnosis connector which plugs into something on the engine (from the schematic) - it's a 2 pole dark grey connector - should be in the back lefthand corner of the engine, towards the top - it looks like it is one of the first splits off of the main engine harness after the start of that harness (where it plugs into the main bulkhead harness) - I am not sure what it plugs into (but from the schematic, it is definitely plugged into something) or how you would go about spoofing it. That might be the connector you are looking for, though.
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Old 12-18-2004, 05:43 PM   #3
elhalisf
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So just want to get a few things straightened out.

I should look probably between the passenger side of the intercooler and the intake manifold for a grey 2 pole plug.

When you say bulk of the engine harness is that from right under the intake manifold where its covered with a plastic shield and clipped to the manifold from under?

So what are you saying exactly, it might be loose or something? Should this be on the 03 engine or on the 04 or both?
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Old 12-18-2004, 08:52 PM   #4
DrD
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Here is a schematic of the wiring harness - E1 is the main connection (to the bulkhead harness), and E61 is the PCV diagnosis connector - according to the manual, it's dark grey in color and has 2 poles. This connector does not exist on earlier cars (or at least not on my 02 )

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Old 10-08-2017, 10:52 PM   #5
D-Rodman
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Default 03 engine w/ 04 ECU in 04 WRX, lack of Blow By Sensor causing CEL? P1491

I知 going to revive this old dog because search and search everybody likes and always suggest, including myself.
I have a 2005 Saab 92x aero, a Saabaru. I just swapped a 2005 jdm wrx ej205 into it, running it on the original usdm ECU at the moment. It痴 throwing code P1492, I知 guessing the issue has to do with the jdm motor not having the pcv sensor and the usdm ecu is therefore not getting the signal it expects. I知 guessing the code has to be turned off via the ecu. I just purchased the car about a month ago, not running. The car came with a ver 1 accessport, I tried reverting it to the stock map but it refuses to divorce. I want to revert to stock map so I can go open source and turn off the code. Any suggestions ?
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Old 10-08-2017, 11:13 PM   #6
merdok
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On my 92x I had a dummy plug no longer used when I changed to aftermarket fuku inlet. I think this is what are being found from the manual. I just had to bridge the two, used the U shaped pin from plug Taped it up and tucked it away. Near fuel rail.

It wasn't a resistor fix like egt was just bridging the two wires.
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Old 10-08-2017, 11:22 PM   #7
merdok
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Quote:
Originally Posted by D-Rodman View Post
I知 going to revive this old dog because search and search everybody likes and always suggest, including myself.
I have a 2005 Saab 92x aero, a Saabaru. I just swapped a 2005 jdm wrx ej205 into it, running it on the original usdm ECU at the moment. It痴 throwing code P1492, I知 guessing the issue has to do with the jdm motor not having the pcv sensor and the usdm ecu is therefore not getting the signal it expects. I知 guessing the code has to be turned off via the ecu. I just purchased the car about a month ago, not running. The car came with a ver 1 accessport, I tried reverting it to the stock map but it refuses to divorce. I want to revert to stock map so I can go open source and turn off the code. Any suggestions ?
Pictures worth thousand words.

This plug into grey connector bridges two wires just to give you that cel when pcv is not installed.

Need to find that plug off your harness and bridge them.. Or just plug that harness into your turbo inlet.
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Old 10-09-2017, 12:11 AM   #8
D-Rodman
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The 05 jdm wrx ej205 engine harness does not have a plug for that nor does the turbo inlet has that grey part. With the usdm ecu that code is going to have to get disabled. I haven稚 used a ver 1 Accessport in a very long time but I went back to it and reverted to the stock map. On the stock map I get 6 codes, 4 additional codes I知 guessing the Accessport was masking. I have a matching jdm ecu, swapped it in and bam, no codes. I think I知 just going to order the avcs wire harness and e tune from IA Performance and go that route.
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Old 10-09-2017, 08:54 PM   #9
D-Rodman
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Black Ver 7 18G 6sp RA

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Disconnected the battery negative terminal and stepped on the brake pedal in order to hard reset the ecu. Only remaining code is P1491 which is just going to have to get disabled at the ecu via open source.
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