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Old 06-28-2004, 07:44 PM   #1
NeaD
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1998 Impreza 2.5RS-T
Hydra User, Blue

Default car doesn't start, part 2

ok... I pluged the stock ecu and my friend came over with his testing tool. Pluged it in and he got a code of po270.

He said that has somthing to do with the injectors.

He checks the injectors plug and every wire gets a 12v and a 0v.

But the one closes to the drivers side gets 2.7v on the green/white wire and gets 12v on the yellow wire.
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Old 06-28-2004, 07:57 PM   #2
munkis
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the ecu will ground the injectors, thats why you have 12v on one side and nothing on the other...

though the 2.7v on the one is weird...

this is all key on?

though that is weird, one faulty injector is not gonna stop the car from starting.

When you crank the car do the injectors click, you might have to listen with a screwdriver ore something.

i cant find P0270, do you have the description?

Jay
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Old 06-28-2004, 07:58 PM   #3
munkis
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wait I found it.

PO270
Fuel Injector Circuit Low Input - #4

Jay
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Old 06-28-2004, 07:59 PM   #4
munkis
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what injectors are in there right now?

did you put the stockers back in with the stock ecu?

also when you are checking the voltage to the fuel injectors are you backprobing them when they are plugged in?

Fuel injectors are controlled by the ecu like I said...might have fried a driver in the ECU, or you have something wired wrong.

Jay
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Old 06-28-2004, 08:15 PM   #5
Aus_RS
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Quote:
Fuel Injector Circuit Low Input - #4
Not speaking from experience, but knowing a bit about electronics, I'd put an ohm-meter over each of the injectors to check #4's resistance.
The injector drivers in the ECU are low-side (sometimes called open-collector) drivers, which switch between 0V and 'off' while the other side has a permanent 12V. Thus if it were possible to measure the voltage at the terminals while the plug is actually connected to the injector, you would measure 12V on both sides, when the driver is 'off'.
I'm guessing the ECU looks for this 12V being passed through the injector coil to be certain the injector is plugged in, and the circuit is intact. If the injector was open circuit (or very high impedance), then the voltage on the switched line would be too low ("Circuit Low Input" ?).
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