I'm not hearing the fuel pump run at all. I'm going to run the exact same test with the old PCB real quick

 

Are you saying that pins 4 & 5 are providing a good ground for pin 16 voltage?

Okay, the OBDII connection failure is a car issue.

 

Yes, exactly

 

Got it.

 

You should be able to pinpoint the problem in the downstream fuel pump circuit with a few electrical tests. The questions will be whether the fuel pump connector receives battery voltage and a good ground.

 

I put in the old JBE and ran the tests exactly as before and got the exact same results - didn't hear the fuel pump run at all with either the jumper nor the K96 fuse.

I also tried the OBDII scan tool with the old JBE and it yet again failed to find the VIN, HOWEVER this time it said "no connection; make sure ignition is on" (I had the ignition on already), whereas with the new JBE that I bought recently it was saying "failed to decode VIN".

 

How can I do that?

 

You're fast with these tests!

Sounds like it's okay to leave the old JBE installed at least for now. With the scan tool connected to the port, are you inserting the key fob and then pressing start without pressing brake pedal?

 

Lol I'm motivated to get this thing moving again

Yes, key fob in, start button pressed, but brake pedal is untouched

 

------------------------------

 

Interesting... I just finished running that test and the pump connector is only reading about 7V where everything else is still reading 12.6V

 

What did you use as the ground for the voltage test? If it was the fuel pump ground pin in the connector, redo the voltage test using the battery ground post as ground. Does voltage reading change?

In the fuel pump connector, the white wire with blue stripe is the power wire and the brown wire is the ground.

 

Ah yeah, brain fart. The only thing close enough to reach to back there for a ground was the bolt holding down the seatbelt. Reading again I got 11.7V at the pump connector, which seems much closer to what it should be, and is probably only a little low because of my not-so-good grounding point

 

Are you now saying that using the fuel pump ground pin (brown wire) to measure voltage at the fuel pump power pin (white/blue wire), you read 7V but when you instead use the seat belt bolt as ground, you read 11.7V?

 

Yes, precisely

 

Congratulations. You have succeeded in finding at least one fault in the downstream fuel pump circuit. Trace the brown ground wire to its connection point to the body. Inspect the brown wire for damage and whether its connection to the body is loose or corroded. Once you fix the brown wire or its connection as evidenced by a ~12V reading from the fuel pump power pin, check whether the fuel pump now runs.

 

Can you help me find the connection point? I tried looking for it in the JBE but didn't find anything that had the exact same wires. I also looked online and didn't find any help there either

 

The grounding point for the brown wire is nearby to the fuel pump cover not the JBE. Just follow the brown wire.

 

I'm not seeing where the grounding point is at all. The cable loom disappears into the bodywork before I can see anything else

 

X13795 shows the ground point location for the fuel pump brown wire - leftward of the fuel pump cover.

 

More detail...

 

I think I found it - it's an orange-ish circular thing that has something plugged into it. That connection didn't appear corroded and it wasn't loose

Edit: I didn't realize I had to remove the inside trim. Give me a minute to do that

 

I think it's located between the amplifier and the rear woofer.

 

Found the ground location. Looks clean and it seems tight

 

You are fast!

Measure resistance between the fuel pump connector ground pin (brown wire) and the X13795 brown wire grounding point.

Also measure the fuel pump connector power pin voltage using X13795 as the ground.