I think there's something wrong with the OBD-II connector on my truck. I bought wifi adapter off amazon a little over a year ago. I couldn't even get the wifi working. I exchanged it for the same one thinking that I got defective one, and still had the same problem and never was able to get it connected.

I put it on the back burner for a while, but I really want to get this working this year. Based on this thread I ordered this adapter. I know it this configuration works - see post #50 in that thread.

But I still have the same problem. Sitting in the truck with the key on, there's no wifi signal coming from it that my iphone or ipad can see. The instructions also say that there's supposed to be an LED that comes on when the unit has power and I don't see any LEDs.

Just to be clear - this is before the app is started. The app has nothing to do with this as I can't get that far. They need to be connected on the same wifi first and that's the part that's not working.

I've had the codes read on my truck but it was before I tried the first adapter so I can't say for sure that I can even read codes on it.

How do I troubleshoot this?

 

Works great on Android 5 and up

https://www.amazon.com/Vgate-Bluetoo...rds=vgate+OBD2

Torque Pro
https://play.google.com/store/apps/d...g.prowl.torque
Use the communication in the profile
SAE J1850-PWM
make sure you add in Ford PIDs


https://play.google.com/store/apps/d...ch.CarGaugePro
people like it cause it will pull codes, buzz test and CCT


Some OLD PCM's have to be flashed before you can pull codes

 

I had that sort of issue, the fuse for the OBD connector was blown. Check the fuses.
I'm not sure your AOS wigget is going to work.

 

Thanks to you, buddy it works great!

Fuse #3 was blown.

 

I believe that is also the same fuse that supplies 12v to the power point on the dash. We blew the fuse a couple of times with a faulty phone charger before realizing what was going on.

 

As soon as I saw there was no light, I was thinking cigarette lighter fuse. I use that outlet to power my tablet, so I'd know right away if there was an issue there.

 

My cigarette lighter must be on a different circuit because I keep a voltage meter plugged into it and it was on the whole time.

 

OK... then it was one of the other power sources. There are a few in the OBDII port, but the cigarette lighter fuse is the most common one to fail, since it is the most likely to get overloaded by the user.

 

What other power is in the OBD? Specifically, what keeps it powered while cranking? On this E450, the cig plug (#23) powers the OBD, but it goes off while cranking.

Here's the thread, so I don't hijack too far: https://www.ford-trucks.com/forums/1...-no-start.html

 

If you are losing your data during a crank, what are you using to measure the voltage? I only ask because a really low battery may cause some OBDII adapters to stop working. It's also possible the communication to the OBDII port is compromised during crank because of a bad 5 volts somewhere. Maybe the 12 V or one of the grounds are flaky, and that's what blew the fuse to begin with.

 

Good point, Rich! I was just using the OBD/Torque Pro for voltage. I should have put a meter on the battery.

I guess it is quite possible that CPS + Low batteries could be the prime issue.

Thank you for the OBD pinout. What I was expecting....

In the 1991 Ford 7.5L gasser, the EEC-IV port has power, then pulsed power (actually pulsed GND) for the fuel pump. It uses the one feed for the fuel pump in initially, then as the engine cranks/starts and comes up to speed, the PIP of the distributor is used and the circuit control is "handed off" to the pulsed pin for the fuel pump.

I thought it might be something like that: Constant voltage, then a "cranking signal"? Probably way off, though

 

Inline fuel pressure gauge?

Anyone know of one that I can install the sender after/near the pump? Sure it won't tell me anything about the filter/bowl, but right now I have no indicators at all.

80% solution maybe?

Thanks

 

Time and measure the fuel bowl drain with key on? 34 GPH is stock fuel pump flow at operating pressure, you should be able to exceed 1/2 gallon in a minute quite easily.

 

Thanks. I am going to add fuel as well, just in case. Maybe it ran below a compromised pickup foot?

Seems odd no fuse for the OBD port. A blown fuse like Andy's is known and what I was expecting, but none at all? Hmmm....

 

There is a fuse, but it is shared with other things - not just for the port.