Technical Oil light after an oil change

[koalar]

Good thanks

connect just the oil pressure switch and measure the Ohms from the same pin on the connector under the fuse box to the engine block

 

[endreoze]

Good thanks

connect just the oil pressure switch and measure the Ohms from the same pin on the connector under the fuse box to the engine block

Than it’s 00.1 ohm

 

[koalar]

Than it’s 00.1 ohm

good

we now know all the way from the engine block to the connector block is okay including the switch

 

[endreoze]

good

we now know all the way from the engine block to the connector block is okay including the switch

So the ECU is fried?

 

[koalar]

we now need to check if 5v is present on the corresponding pin on other half of the connector


ignition on

 

[koalar]

So the ECU is fried?

still more tests yet.


Wiring is more likely. I have yet to see one randomly fail. Unless its been flooded with water or something similar. Fingers crossed

 

[endreoze]

we now need to check if 5v is present on the corresponding pin on other half of the connector


ignition on

Is this the lower half of the connector under the fuse box?

 

[koalar]

Is this the lower half of the connector under the fuse box?

yes

the other half of the connector thats under the fuse box

 

[endreoze]

yes

the other half of the connector thats under the fuse box

okay there is 0 volt on the corresponding pin

 

[koalar]

okay there is 0 volt on the corresponding pin

thanks


with the ignition off


what are the ohms between this pin and the engine block

 

[endreoze]

thanks


with the ignition off


what are the ohms between this pin and the engine block

It says OL

 

[koalar]

It says OL

thanks

so there's no 5V getting here and its not being pulled to ground via a short


ECU not sending out 5 volt, ECU connector fault or a break in the wire to this point.

carefully remove the ECU plug and inspect the pins both on the ECU and in the connector. Better if you have a magnifying glass or can take a photo and enlarge.

make sure all the pins look identical and even. No green corrosion

 

[endreoze]

Okay so there is definitely some green corrosion going on, and I have found one pin is sticking out from the connector. I attached the photos and circled that pin.

 

[koalar]

Pin 8 is snapped off

this is the oil pressure sensor

 

[endreoze]

Pin 8 is snapped off

this is the oil pressure sensor

So that's the issue for sure, is it possible to fix it or should I get a new harness?

 

[koalar]

its this pin thats snapped on the ECU and stuck in the connector

 

[endreoze]

its this pin thats snapped on the ECU and stuck in the connector

Ohh **** I didn't even see this one So what are my options now?

 

[koalar]

I would repair it. As thats what I use to do as a job.


most people nowadays just swap everything out.


You need to find someone willing to do the repair.

 

[endreoze]

I would repair it. As thats what I use to do as a job.


most people nowadays just swap everything out.


You need to find someone willing to do the repair.

Probably it can be soldered back on. That was my mistake, how stupid of me...

 

[koalar]

Probably it can be soldered back on. That was my mistake, how stupid of me...

Good luck

while its apart I would address the corrosion on the larger pins

it looks like its getting hot here due to higher resistance caused by the green oxide on the other ECU side


a bit of switch cleaner or contact cleaner should clean it up nicely