Test the Yel/Blk wire in the sending unit connector for a short.

With gauge cluster connector B and the fuel sending unit 3P connector unplugged, set your multimeter to measure continuity and then test the Yel/Blk wire terminal in the sending unit connector for continuity to body ground.

 

I think I might have unplugged the wrong connector. The one I unplugged is circled in red in the attached picture.

Do I need to unplug one of the connectors that are currently covered?

 

That's really helpful, thanks.

I am trying to understand the concept. So if there is continuity, it means that there is a short in the Yel/Blk, right?

My understanding is that with the two connectors unplugged, there shouldn't be continuity between the Yel/Blk and the body ground. There should only be continuity between them when the sending unit is sending something to the cluster.

Is that right?

 

In the connector you unplugged, how many wires does it have and what are the wire colors? Can you also post a picture showing the face of the female side of the connector?

Yes. The one under the rubber cover on the left.

 

Correct.

Correct.

The Yel/Blk wire should always have end-to-end continuity. If not, the wire has an open (no end-to-end continuity). You are looking for a short in the wire, which is detected by measuring continuity to body ground.

 

Ok, I did not remove any rubber cover. I just unplugged the connector shown in the photo. I can't take another photo or check the wire colors right now, but what do you think I unplugged given that it was not covered with anything? If I remember correctly, it 4p.

 

There's a gray 6P connector (C568) for the fuel tank pressure sensor subharness. That may be it.




Unplug the 3P sending unit connector and then turn the key to ON(II) to see whether the fuel gauge needle now drops.

 

Ok, I'll try that. I must have unplugged the wrong connector...

Do I need to worry about all the dirt in there at this point or does it only need to be cleaned if I remove the sending unit?

 

I guess I am still confused. How could there be continuity between the Yel/Blk and the body ground if both connectors are unplugged? In other words, what could be causing such a short? Since the connectors are unplugged, it couldn't be sending unit or the cluster. So what could it be?

 

Just vacuum the loose dirt. The connectors may be coated with dielectric grease. Don't clean that off. If you do, recoat the connectors with dielectric grease.