Oil Pressure Light - and then, not
HDF Community Team
Joined: Mar 2017
Posts: 7,825
Likes: 4,383
From: Texas
Brandon, I don't think it's a three wire sensor any longer. Since 17 it looks to be a switch. Not trying to correct you, just saying what we've seen and heard.
I thought in the switch there was a resister in parallel with the two wires or something that provides a less than 5 volt and greater than 0 volt reading so the ECM would know it's connected.
If the switch was Open, the line/ECM would read 5 volts (PO522). If shorted, 0 volts (P0523). Normal pressure, say 2 volts, and if low pressure, say 4 volts.
Something like that. Like I said, spit balling.
I thought in the switch there was a resister in parallel with the two wires or something that provides a less than 5 volt and greater than 0 volt reading so the ECM would know it's connected.
If the switch was Open, the line/ECM would read 5 volts (PO522). If shorted, 0 volts (P0523). Normal pressure, say 2 volts, and if low pressure, say 4 volts.
Something like that. Like I said, spit balling.
Jake says it is a 0 or a 1 reading (off or on) - no middle-ground, you either have pressure or you don't. You are agreeing with me saying that the current pressure switch DOES know it is high/low/proper pressure, and that it is NOT a 0 or 1 type of sensor?
Last edited by BrandonSmith; Oct 7, 2019 at 02:30 PM.
Seasoned HDF Member
Joined: Jan 2006
Posts: 11,467
Likes: 2,996
From: Charleston, SC
You and Jake are saying two different things, and I'm on your side and you're telling me I'm wrong... I'm confused! lol
Jake says it is a 0 or a 1 reading (off or on) - no middle-ground, you either have pressure or you don't. You are agreeing with me saying that the current pressure switch DOES know it is high/low/proper pressure, and that it is NOT a 0 or 1 type of sensor?
Jake says it is a 0 or a 1 reading (off or on) - no middle-ground, you either have pressure or you don't. You are agreeing with me saying that the current pressure switch DOES know it is high/low/proper pressure, and that it is NOT a 0 or 1 type of sensor?
P0520 Engine Oil Pressure Sensor/Switch Circuit Malfunction
P0521 Engine Oil Pressure Sensor/Switch Circuit Range/Performance
P0522 Engine Oil Pressure Sensor/Switch Circuit Low Voltage
P0523 Engine Oil Pressure Sensor/Switch Circuit High Voltage
P0524 Engine Oil Pressure Too Low
So like Strych said, Voltage, not pressure. These codes are multi-purpose since they work for a sensor or a switch.
For an actual sensor (variable voltage) it can range from 5 volts down to 0 I guess or more likely a range in between. For a switch it's probably going to be one baseline voltage and one other voltage (switch tripped) that mean stuff.
Additionally, and programmed into the ECM, there is probably one lowest range (0v) and one highest range (5v) which will trip P0520/521 depending on how it's implemented.
When the switch is tripped you probably get P0524. What I don't know is if tripped is the switch closed or open.
Regardless of all that... what "Jake" said is true. It's a simple switch now. What I was trying to explain is how a faulty switch could possibly trip both a high and low code.
Last edited by lp; Oct 7, 2019 at 03:39 PM.
Stellar HDF Member
Joined: Jan 2017
Posts: 2,662
Likes: 2,065
From: Massachusetts
I had a 2016 flhx, it had the capability to display the oil pressure on the info screen, it was equipped with the following part
74438-99A OIL PRESSURE "SENDER" from Harley's microfiche
I now have 2019 flhxs, it does not have oil pressure readings available, nor can it with the oil pressure "switch" .
71400112 OIL PRESSURE "SWITCH" from Harley's microfiche
For what ever reason,Harley decided they no longer needed the customer to be informed of the oil pressure readings. Hence the idiot light we have now on the touring bikes. But if you think about it, all the bikes without a screen, have been this way for years. I am a curious person by nature and added a analog rocker box mounted gauge for my own edification.
74438-99A OIL PRESSURE "SENDER" from Harley's microfiche
I now have 2019 flhxs, it does not have oil pressure readings available, nor can it with the oil pressure "switch" .
71400112 OIL PRESSURE "SWITCH" from Harley's microfiche
For what ever reason,Harley decided they no longer needed the customer to be informed of the oil pressure readings. Hence the idiot light we have now on the touring bikes. But if you think about it, all the bikes without a screen, have been this way for years. I am a curious person by nature and added a analog rocker box mounted gauge for my own edification.
Last edited by jake24lt; Oct 8, 2019 at 07:33 AM.
Club Member
Joined: Apr 2016
Posts: 11,500
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From: Inland NW
Just curious, thanks!
Stellar HDF Member
Joined: Jan 2017
Posts: 2,662
Likes: 2,065
From: Massachusetts
pressure
I get 10-15 lbs at hot idle and 30-40 at higher rpms hot. Cold is another story. I can get70 lbs when stone cold. I never push it till it warms up. That's with an s&s pump
Club Member
Joined: Apr 2016
Posts: 11,500
Likes: 8,336
From: Inland NW
Appreciate it!
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,862
Likes: 7,981
From: poway
I suspect it's a message on can bus thing. I think that the BCM sends the message to the speedo / dash. Something might have caused a bit to be read wrong. Mine did it once but I looked down at a mechanical gauge and it was reading 40 psi.
Road Warrior
Joined: Sep 2016
Posts: 1,395
Likes: 364
From: Okmulgee
On my 2017 it was just a simple made in India open/closed switch,,, nothing more. No more advanced than a oil pressure switch you would find on a riding lawn mower sold at Wal-Mart. if they went to a sender unit that read on a 4 to 20 ma scale,,, good on HD.
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Tourer
Joined: Dec 2016
Posts: 291
Likes: 128
From: N/A
2017 FLHR, 17K miles
Couple days ago, fire the bike up, cool morning (about 49F), head down the road. About 2 miles out, I realized I forgot my cell phone (damn). Turn around, go home, stop the bike, get phone, hop back on start the bike, pull out.
About a mile down the road, I realize the oil light has come on. Pull over about another 1/2 mile down the road where there is a good, visible/safe spot to do so. Shut the bike down - ignition everything "off", wait maybe 10 seconds, fire everything back up. No oil light.
Couple days ago, fire the bike up, cool morning (about 49F), head down the road. About 2 miles out, I realized I forgot my cell phone (damn). Turn around, go home, stop the bike, get phone, hop back on start the bike, pull out.
About a mile down the road, I realize the oil light has come on. Pull over about another 1/2 mile down the road where there is a good, visible/safe spot to do so. Shut the bike down - ignition everything "off", wait maybe 10 seconds, fire everything back up. No oil light.
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