Ford Repair Questions? Ask a Mechanic for Answers ASAP
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Are there any lights on or illuminated on the dash with the engine running?
Thank you for that information. Try disconnecting the connectors going to those modules. I bet the communication will resume.
The ABS module is located under the hood by the battery.
The restriant control module is located inside the vehicle under the dash on the left hand side.
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Going to get some sleep. I will send you a list of the rest of the modules on board the vehicle that could short out causing this problem. Move on down the list until you find the one that is shorting out the BUS circuit. Of course, be sure the power and grounds are good to the diagnostic connector are good and the wiring and connections from the data link connector to the modules check out good.
The module communications network consists of the following items:
restraints control module (RCM)generic electronic module (GEM)4-wheel drive (4WD) control module4-wheel anti-lock brake (4WABS) control modulepowertrain control module (PCM)central security module
Here is a complete wiring diagram of your BUS circuit. It is going to be one of these modules or a wiring issue between these modules. You can see if the diagram that both pin 4 and 5 should be ground.
So your saying there is now communication?
So you can read codes? You must have communication now. At first, you said there was not communication
The state inspection is looking for stored, current and pending codes. So if you can pull codes, it should be able to pass inspection.
Maybe someone switched the wires. Use the wiring diagram I sent to verify the correct wiring going to the correct pins on the diagnostic connector.
I have never seen a scanner or emissions state inspection machine be able to pull codes but not pass a vehicle due to a no communication issue. It sounds like I am not getting all of the information here.
In addition, if there is something flashing on the dash, then there should be codes in the computer that is related. So if you can read codes, what codes do you get?
YES, try to get the vehicle tested again.