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Old 06-15-2010, 06:15 PM   #1
gloyale
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Member#: 134923
Join Date: Dec 2006
Location: Corvallis, OR, PNW
Vehicle:
1989 GL w/96 EJ22

Default Code 0180? Fuel Temp sensor circuit?

Hey all.

Run into a new problem. Sorting out the last bits of my EA to EJ convesion. Got the OBD II connector hooked back up. Scanned codes.

Got a p0180......Fuel temp sensor circuit.

Problem is, the ECU, Harness, Engine and everything are from a 96 Outback, MT, 2.2. I don't think it had a Fuel Temp sensor.

all the charts and diagrams I've seen show the Fuel Temp sensor as a 1.8 only.

Anybody got ideas?
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Old 06-17-2010, 12:02 AM   #2
gloyale
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Member#: 134923
Join Date: Dec 2006
Location: Corvallis, OR, PNW
Vehicle:
1989 GL w/96 EJ22

Default

Solved

There indeed was a fuel temp sensor circuit. At least a wire at the pin.

Pinout chart said it should measure 2.8 to 3.4 volts key on, 77 degrees outside.

I measured it and it read about 5-6ish, don't recall excactly.

So I took the wire and soldered in a 270 ohm resistor on it in series to ground. Volts dropped on the pin to about 4.5

So I added in more resitors in series until I got the measurement to just under 3 volts.

Took 4, 270 ohm resistors to get there.

Cleared codes and bang, check engine light off for the first time since installation of the EJ engine (about a month)

I didn't like all the resitors in series, so I just went to radio shack and got a 1k ohm resistor (1/2 watt rated) and put it in instead. Works

So there you go eveybody.......1k resistor tricks the Fuel temp circuit FTW
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Old 06-18-2010, 03:32 PM   #3
gloyale
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Member#: 134923
Join Date: Dec 2006
Location: Corvallis, OR, PNW
Vehicle:
1989 GL w/96 EJ22

Default

Oh, Also I forgot to mention the pin for the fuel temp sensor ciruit is 25, a red and Green? striped wire.
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Old 08-05-2010, 08:22 PM   #4
subbieedude!
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Member#: 220033
Join Date: Aug 2009
Default

thankss. this hopefully solved my problem as well. i got the same code cuz i swapped a 2.2 ecu and motor into my car this is the only code that holds me from my inspection sticker.
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Old 03-24-2013, 03:02 PM   #5
kanurys
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Member#: 260111
Join Date: Oct 2010
Location: Durango, CO
Default

Nice find. I did some measuring and found a 1.2k resistor did the trick for a '99 phase II 2.2.
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