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Old 08-14-2017, 07:36 PM   #1
robmobile1970
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Join Date: Mar 2014
Default USDM Cam position sensor incompatability with JDM EJ205?

Swapping JDM EJ205 w/AVCS into my 06' Bajar turbo due to EJ255 burned valves. I followed alot of advice in different places to include the company that sold me the motor: "Use your USDM intake with wire ha'rness, and USDM downpipe with sensor on the JDM engine. It will bolt in run with no codes."

Problem: It misses at part throttle and gives CPS codes. I had to use the CPS's from the USDM ej255 as the JDM CPS's are 2 wire not 3 wire and won't plug in. Another thread suggests installing the USDM camshafts with the currect "sensor interface bump" on the cam for the USDM sensor.........I really don't wan't to pull the engine to do this. I want to invest as little time and money as possible to recoup value from this car when I sell it.

Can I unplug AVCS and CPS all together and have it run without codes? Is there another way around this problem?
All help appreciated.
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Old 11-25-2017, 03:49 PM   #2
elislider
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i'm running into this issue now, working on a JDM v7 EJ205 w/AVCS swapped into a 06 Forester XT, so far everything else swaps and bolts on, but the rear cam sensors are different (2 wire) and the USDM ones (3-wire) don't fit into the same holes. I'm considering trimming some of the plastic one the USDM cam sensors so they fit and be can be bolted down... but i'm not sure if the cam pickups are the same.. trying to find pictures to compare now

I have a sinking feeling that even if I do this, the USDM Forester ECU won't be able to read the cam triggers correctly because the sensors and/or cam pickups are different
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Old 11-26-2017, 11:50 AM   #3
carnz-pj-410
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1995 Turbo Impreza
701whp 05 2.5XS Forester

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Quote:
Originally Posted by elislider View Post
i'm running into this issue now, working on a JDM v7 EJ205 w/AVCS swapped into a 06 Forester XT, so far everything else swaps and bolts on, but the rear cam sensors are different (2 wire) and the USDM ones (3-wire) don't fit into the same holes. I'm considering trimming some of the plastic one the USDM cam sensors so they fit and be can be bolted down... but i'm not sure if the cam pickups are the same.. trying to find pictures to compare now

I have a sinking feeling that even if I do this, the USDM Forester ECU won't be able to read the cam triggers correctly because the sensors and/or cam pickups are different
The cam pickups are different you have to swap the cams to usdm to work with your ECU.

The JDM 2 wire sensors are magnetic type and the USDM 3 wire are Hall Effect, the triggers on the camshafts are different to reflect this as well
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Old 11-26-2017, 12:26 PM   #4
dan86
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Lucky for me i did the 205 swap into my 04 wrx and used the jdm ecu they sent with the motor no issues but there is no emissions where i live
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Old 12-27-2017, 12:19 PM   #5
kuksees
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Default It is possible to run the JDM 2 pin cam sensors in place of the USDM 3 pin cam sensor

Quote:
Originally Posted by elislider View Post
i'm running into this issue now, working on a JDM v7 EJ205 w/AVCS swapped into a 06 Forester XT, so far everything else swaps and bolts on, but the rear cam sensors are different (2 wire) and the USDM ones (3-wire) don't fit into the same holes. I'm considering trimming some of the plastic one the USDM cam sensors so they fit and be can be bolted down... but i'm not sure if the cam pickups are the same.. trying to find pictures to compare now

I have a sinking feeling that even if I do this, the USDM Forester ECU won't be able to read the cam triggers correctly because the sensors and/or cam pickups are different
I just finished working on a 2005 Legacy GT Turbo. We put a JDM v7 w/AVCS into this vehicle. It is possible to condition the signal waveforms for the USDM ECU to read and interpret them.
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Old 01-17-2018, 04:32 PM   #6
robmobile1970
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I am trying to run with AVCS disconnected and have zeroed out the cam advance table in the tune and turned off the Camshaft sensor codes in a attempt to run the car with AVCS disabled. I can't even get it to start now. I'm wondering if the AVCS and Camshaft sensors have anything to do with ignition timing?
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Old 01-29-2018, 07:31 PM   #7
robmobile1970
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I used a tactrix cable to flash a tune with zero AVCS advance, force pass on OBD codes. Car now does not go into limp mode, but I still get codes for Camshaft position sensor. I tried turning off the camshaft position codes with a tune, but when I do that the engine does not start. Elsewhere on the forums it has been mentioned that "the magnetic signal(from the JDM cam/sensor) can be conditioned to match the hall effect output needed by the ECU"..................After doing some searching I have found this webpage http://www.dycor.com/what-do-we-do/p...l-conditioner/ .............It appears this device can accept a magnetic sensor input, convert it and output a hall effect type signal......Theoretically if my logic is right the JDM sensor wires for Camshaft position sensors could wire to this device inputs and the output wired to the USDM signal wire for the hall effect USDM sensor..............

I'm hoping someone smarter than I am can read this and put their thoughts on it.
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Old 02-04-2019, 05:29 PM   #8
robmobile1970
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Update: got back into this the past frew months. I swapped USDM camshafts into the JDM engine to be read by the USDM sensors. Right side worked fine, but had errors on the left side. USDM sensor doesn't line up right with the groove on the USDM cam as the sensor hole is in a different position. I pulled the cam and had the grooves on the cam lengthened so the sensor lines up with the groove, but it still is not working. I'm still getting errors. Any Ideas?
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Old 04-10-2020, 08:57 PM   #9
skoolboi434
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Hey, did you ever find a solution? I swapped a jdm legacy engine into my 08 wrx and it's running rough and not building boost. IAtuning said to put in ej255 cams and rear cam sensors but I can't find a 3 wire adapter. Thanks for any help you may be able to provide.
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Old 04-10-2020, 08:59 PM   #10
2slofouru
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You have to use whichever sensor type your ecu originally came with, hall effect and reluctor type work totally differently. Hall effect is a digital on/off signal and reluctor is basically an alternating current wave.
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Old 05-23-2020, 12:20 PM   #11
Favila889
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Default Hi

Hi the thing about jdm and usdm is the way the ecp reads the cams in jdm cars its the valve opening in usdm the sensor is on the cam itsself
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