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Old 02-25-2012, 10:02 PM   #1
tom bauer
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Default P1446 code, how to turn off after repower

here is an explanation of what the ECU looks for and how to deal with it. now i know some people would just have the code 'removed' from the ECU, and that will do it but this is how the system works.

on older subys like my 98 LOBW, there are only 2 vsv's for the emmissions system. when you repower like i did with a newer engine and ECU, (06LGT) the ECU wants to see 3 vsv's. the offending one is the internal pressure selenoid that older cars did not have.

the way the ECU checks the vsv's to see if they work is to look for voltage on the appropriate ECU pin. it assumes that if the coil is good and the circuit complete, it will work. these vsv's have 12 volts from the main relay on one side of the coil and therefore there is 12 volts on the the other side of the coil unless the ECU grounds it to energize the vsv. but since there is no vsv for the internal pressure, there is no voltage, so it says circuit low, and reports P1446.

the fix is very simple, give it what it wants! using a 1200 ohm 1/2 watt wire wound resistor, connect the resistor from a switched ignition source (12 volts) to the correct pin of the ECU. (ECUs vary but for an 04 STI and XT it would be pin A24). when the ECU tries to energize the vsv it will ground the one end of the resistor, which is fine since at 1200 ohms, 12 volts dropped across the resistor generates a current of .012 amps (12 milliamps) and heat of .144 watts. you will not be able to feel this small heat so it will not cause any issues.

and you will never see P1446 again.

tom
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Old 02-27-2012, 03:49 AM   #2
DHRDAN
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01 2.5RS W/ EJ257
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bump 4 good info.
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Old 02-27-2012, 04:07 AM   #3
Einimas
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now figure the egr on sf foreter ej25d usdm to ukdm engine swap, that has no egr port on the head
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Old 02-27-2012, 08:44 PM   #4
tom bauer
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Einimas give me more info, year etc and i'll figure it.
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Old 02-28-2012, 06:06 PM   #5
Einimas
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I'm from europe, Lithuania to be precise i have a usdm (imported) sf 1998 forester it had a ej25d with a rod knock i have sourced a mint ej25d ukdm motor and swaped it. the only issue i now have is there is no egr port on the back of left engine head. So i blocked the egr valve on the intake manifold, and now i'm getting constant cels becouse of it. I thought about routing a pipe to the egr valve straight from exhaust, but i'd like to eliminate egr completely.
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Old 02-29-2012, 06:22 PM   #6
tom bauer
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i suspect the egr controler wants to 'see' some small pressure from exhaust. i would need to look at my 98 legacy to see what it uses, if i can i will let you know.
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Old 03-10-2012, 12:20 PM   #7
Einimas
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any luck?
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