Vtec Oil Pressure Sensor/Kpro/JDM K20A problem.
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JDM engine does not have a VTEC oil pressure sensor. You can do one of two things.
Best solution is to fit the sensor and wire it in. This way you'll have an early warning system of things going wrong, since the engine will drop out of VTEC when the oil pressure starts to drop to much.
Easy solution, open the ECU and solder in a resistor to trick the ECU into thinking you have got the sensor. Hondata will be able to tell you which pins and the value of the resistor.
Best solution is to fit the sensor and wire it in. This way you'll have an early warning system of things going wrong, since the engine will drop out of VTEC when the oil pressure starts to drop to much.
Easy solution, open the ECU and solder in a resistor to trick the ECU into thinking you have got the sensor. Hondata will be able to tell you which pins and the value of the resistor.
The JDM engine does not have the oil pressure sensor and also the JDM harness does not have the connector.
Easiest solution is to disable the error in the KManager software. If you really want to know 4 seconds after the head loses oil pressure, you'll need the US harness and US pressure sensor.
Easiest solution is to disable the error in the KManager software. If you really want to know 4 seconds after the head loses oil pressure, you'll need the US harness and US pressure sensor.
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huh?hondata said:
New harness - why? And yes I do want to know if the head loses oil pressure even if it's 4 seconds after the event. Because the VTEC pressure sensor triggers when you still have a reasonable amount of oil pressure. Unlike the main oil warning light which simply informs you that you're screwed. If the engine starts to drop out of VTEC due to a drop in oil pressure it's a sign that you need to sort the oil system out. Without it your first indication is likely to be a death rattle as your bottom end gives way, followed shortly thereafter by the oil warning light coming on
Frankly I'm surprised you recommend disabling the function in Kmanager and I'd like to know why you feel this is the correct approach.
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iwilson said:huh?
New harness - why? And yes I do want to know if the head loses oil pressure even if it's 4 seconds after the event. Because the VTEC pressure sensor triggers when you still have a reasonable amount of oil pressure. Unlike the main oil warning light which simply informs you that you're screwed. If the engine starts to drop out of VTEC due to a drop in oil pressure it's a sign that you need to sort the oil system out. Without it your first indication is likely to be a death rattle as your bottom end gives way, followed shortly thereafter by the oil warning light coming on
He didn't say correct, he said easiest.
The second solution he suggested on the other hand (regarding the harness) wasn't the easiest; it was the correct one.
E.J.
The VTEC oil pressure switch does not do anything useful. It just rev limits the engine a little while after the engine has insufficient oil pressure for VTEC and drops to the low cam. If you want a warning for low oil pressure I'd suggest an oil pressure guage with adjustable warning light would be a much better investment than wiring up the VTEC pressure sensor.
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I agree and have done so. But the majority of people don't. And if they do, in most cases they fit a standard single wire gauge of dubious accuracy that has no warning light. The typical scenario for a drop in oil pressure is under high G's which is precisely the time when the driver is concentrating on where he's going rather than looking at an oil pressure gauge. Fitting the VTEC oil pressure sensor is cheaper and provides a warning you cannot ignore.hondata said:
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Have to say, I agree with Ian here.
Way I see it, I would rather have it fitted and working than not...
it only takes a few minutes to fit, has zero down sides, and cost very few $/£
They do provide a very good warning of a problem, (usually low oil level etc) and whist they are not a 'catch all' or any form of garentee that you will not/already have screw(ed) the engine, it's way better than nothing.
I personally, allways fit them to JDM's as a matter of course.
Way I see it, I would rather have it fitted and working than not...
it only takes a few minutes to fit, has zero down sides, and cost very few $/£
They do provide a very good warning of a problem, (usually low oil level etc) and whist they are not a 'catch all' or any form of garentee that you will not/already have screw(ed) the engine, it's way better than nothing.
I personally, allways fit them to JDM's as a matter of course.
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Garet Jax said:
This being the case, your going to have to explain exactly what your problem is as your first post implies that you don't?
Vtec oil pressure switch is connected to ground on one side, and the ECU (B9). when the engine is at idle (assuming the oil is up to temp) it should be closed (as in the switch grounds B9 to the ECU), when the engine speed is raised and the oil pressure comes up, then then opens the Vtec switch, letting the ECU line (B9) go up to battery voltage, thus telling the ECU that there is oil pressure.
if this is not connected (as in K20A JDM engines) then the ECU will restrict you to 4,000Rpm. Also worth noting that JDM ECU's can't use the Vtec switch, even if it's connected and programmed (ie. you have to dissable it in SW).
worth remebering that this is not the only reason why the ECU will not engage Vtec....
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I'm having a problem with this. i have a jdm k20a and usdm prb ecu. i want to add this vtec oil pressure switch, since its cheap, to my k20. the reason i want to do this is I'm getting a P1259 DTC. my engine will not go over 4500 rpm. it took my all 6 gears to get up to 45mph. i understand you ground one wire and put the other on B6. where does the oil pressure switch plug in to on my motor?
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awesome info guys. I had the same code on my k20a and just disabled it in kpro. I'm going to run an oil pressure gauge. If the JDM motors don't have one, why do we really need one? Oil Pressure gauge will be fine with me.
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