2001 T190 error code 04-21 help

[MikeDaley507]

Hi guys, new member here. I was running my t190 the other day and I got the engine oil pressure warning light and the machine shut itself off. I changed the oil and checked the oil pressure with a mechanical gauge and it was reading 50PSI at idle and 64PSI at WOT. I replaced the oil pressure sensor with a new one a friend had and the warning light is still on and the 04-21 code is back after disconnecting the battery to clear it. Where do I start with my diag? I'm not finding much helpful information online. Thanks in advance!

 

[polishpete]

check the main drive belt

 

[MikeDaley507]

check the main drive belt

Does that effect the engine oil pressure?

 

[polishpete]

i believe so why not sure just look if belt is tight

 

[polishpete]

or by pass tge switch oil pressure and see if light shuts off than u know its sensoe or oil related

 

[brdgbldr]

Hi guys, new member here. I was running my t190 the other day and I got the engine oil pressure warning light and the machine shut itself off. I changed the oil and checked the oil pressure with a mechanical gauge and it was reading 50PSI at idle and 64PSI at WOT. I replaced the oil pressure sensor with a new one a friend had and the warning light is still on and the 04-21 code is back after disconnecting the battery to clear it. Where do I start with my diag? I'm not finding much helpful information online. Thanks in advance!

You could have a wiring short to your sensor. If the wrong voltage is going to the sensor the computer thinks there is a problem.

I'm not sure what the voltage should be going to the sensor. Hopefully someone else on here knows.

 

[RedNeckMike]

Is the oil pressure switch Normally open or closed contacts. If open contacts you may have a short in sensor wiring that is sending a false signal

 

[MikeDaley507]

You could have a wiring short to your sensor. If the wrong voltage is going to the sensor the computer thinks there is a problem.

I'm not sure what the voltage should be going to the sensor. Hopefully someone else on here knows.

I read that the sensor should have 8V and I verified that my sensor has 8V going to it

 

[polishpete]

by pass the sensor