Found this also. It is a response to a not starting after a battery change. Blinking light. Start your rig Godislove answered 5 years ago. It worked Dandyoun!!! Exactly like you said, put the key in the ignition, turned it on and off, then on the 8th turn to on, the Theft light stayed on, then turned off.
I pushed each button on my keyfob including the Panic kind of scary because it might not go off, but it didtook the key out, put it in the ignition and started it right up. Took key out again, put it in and started up. Problem gone. Man, I was going to have to have this vehicle towed about 30 miles, and I tried all kinds of stuff posted in this forum.
Called a couple Ford Dealers who had no clue about this reset method. I knew it had to have something to do with the battery, because this all started when the battery went dead. Punchi23 answered 3 years ago. Kiel answered 3 years ago. Even you buy new key doesn't work properly anything can find what is the problem?
I tried to relearn the key fobs duplicate from part source doesn't work but the ford says need to change the computer but I can't change it bec. It's too expensive I'm looking for a good electrician his name is tom and I buy the truck from hi way 7 and younge st.
He knows about my truck. Catalan answered 2 years ago. Try turning the key and moving the shift from park to drive and back. Then try starting it again!Each transponder is coded with a unique identifying code made from a possible 18 billion combinations. The transceiver then communicates with the PATS module.
The transceiver sends the key code to the control module through the receive Rx signal. The key code data is stored in the PATS control module. The PATS control module compares the received key code and validates or rejects the key code.
During this period, the PATS security warning light is illuminated. If the key code does not prove out or there is a fault with the system, the PATS warning light will either stay light or flash. The PATS control is a stand alone module. Only 1 key needs to be programmed for the system to work. Up to 16 keys can be programmed.
At each start sequence, the PCM power the fuel pump and injectors until the engine runs for 1 second. The PCM then allow the fuel pump and injectors. Some vehicles also include a starter relay.
If the key code is valid, the PATS control module also grounds the control coil in the starter relay, which moves the contacts and sends power to the starter motor solenoid. Must have two programmed keys in the control module to allow vehicle starting. Only accepts 8 programmed keys. No-crank on a PTS vehicle without starter disable. Check the vehicle list for the presence of starter interrupt. There are only two parts to the system as shown above: transceiver and control module.
You must have a code reader that can read these codes. B Unprogrammed encoded ignition key detected leave ignition on for 20 seconds before trying a programmed key, in Anti-Scan Mode. Yes, you might need some reprogramming, but most shops and auto locksmiths can do that kind of work these days.
Then you have two options. In that case you most likely have to send your PCM into the company to have them alter the software so it no longer looks for a PATS signal. Unlike the cheaper Haynes and Chilton manuals that cover multiple year models, leaving the exact information you need to fix your car, these professional manuals cover your exact year, make, model.
Plus, they contain full trouble code descriptions and troubleshooting instructions. Pricing: Eautorepair. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. However, Alldatadiy.We recommend Torque Pro. Note that the most commonly affected circuits are those that feed power to the door chimes through the ignition switch. While many drivers regard the door chimes as a major nuisance, their purpose is both to prevent drivers locking the vehicle with the key in the ignition, as well as to serve as a warning that one or more doors are not fully closed and latched while driving above a predefined speed.
Ford PATS transceiver scope diagnosis
However, failures in door chime circuits often cause short circuits that can, and do, drain batteries, which can cause no-start conditions and in cases where the battery drain is severe, the total or partial loss of vital programming in one or more control modules, including the PCM. The image above shows a typical door chime, such as might be found in almost any Ford application.
Note that while the actual location of the chime varies between models, it is most commonly located behind the dashboard, close to the steering column. This site uses Akismet to reduce spam. Learn how your comment data is processed.
I have been trying to resolve two problems. Any help will be greatly appreciated, I already changed out the 2nd break off switch on master cylinder. B P P on my 95 mustang 3.
I do have a defective ignition switch causing my door chime to go off until i adjust the rabbit esrs just right and when battery goes low a weird sound can be distantly heard.
Thx everybody. Skip to content. Most reacted comment. Hottest comment thread. Recent comment authors. Notify of.
Curt De Huss. Phillip Edwards. I need help please B Bbody p pcm in complete u network. Phillip Edwards lll. Charles Rickman.B Ford OBD2 may also be triggered by faults earlier down the line.Ford pats security anti theft system halo/transceiver
For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems. The computer notices the canister is empty when it detects a leaner condition all the vapors are used up and it resumes normal fuel delivery. Some car manufacturers then close the vent solenoid but leave the purge solenoid open.
That creates a vacuum throughout the entire fuel storage system. Once the correct vacuum is reached, it closed the purge solenoid and waits to see if the vacuum holds.
The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter.
What you want to look any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature.
All auto trouble codes with car brands. P U B C Example: Example: Customer stated thate vehicle would not crank.
Verified no crank symptom and noticed security light flashing rapidly. Found codes in PCM as follows. Cleared codes and B returned. Neither of the two keys in vehicle worked.
Scope connections at PATS transceiver. This two way communication between the PATS transceiver and the PCM is designed to happen immediately after key on to allow the vehicle to crank and start. As you can see in this scope capture. However the yellow trace just remains stuck at 12 volts. So we condemned the PATS transceiver and got authorization from the customer to replace it.
Failed PATS transceiver scope pattern. We installed the new PATS transceiver module and cleared the stored codes and the vehicle cranked and started on both keys. The vehicle would not crank until I cleared the stored codes. Also the PATS transceiver is not a programmable module on this vehicle so that did not require any programming.
The PCM still had those key codes stored and it was as simple as replacing the PATS transceiver, clearing the codes, and testing for both keys to start the car. Thanks TK! I have the chart. It's a good example of why we shouldn't ever "remember" how things work, but look it up. The issue is when the battery goes dead or low it will forget the keys. Just to make the job complete. Hi John, Thanks for the tip. It has been a few days ago, so I hope I'm not getting mixed up with another Ford.This function displays all important information about PATS system and its state.
Ford IDS doesn't provide this function.
B1681 - PATS Transceiver Module Signal Is Not Received
Minimum number of keys: Minimum number of programmed keys required for correct function of PATS car won't start if less then required number of keys is programmed. Number of coded keys: Current number of programmed keys. Number should be equal to or greater than previous value, in other case trouble codes will appear fault code memory. It is very important to have correct type of transponder for every model and minimal number of keys.
The PATS Login is used only for test purposes to verify correctness of incode and some special operations. Timed PATS starts the countdown automatically. Program cannot speed-up the countdown, it fully depends on the control unit. You can cancel the running countdown by clicking on Cancel button.
While FCOM is waiting for control unit to unlock, it communicates with control unit and therefore ignition has to be switched ON. A dialog waiting for the completion of the operation programming, clearing, etc.
Operations are described in following chapters. Then press Cancel button to start coding procedure. If you are changing key, ignition must not be switched off for more than 10 seconds. As long as minimal number of keys required by PCM isn't programmed, engine may not start. Fault code memory will show error stating that less than minimum required keys is programmed.
If you fail to correctly program keys after running Erase keys procedure, you can try to add keys one-by-one using function "Program add a new key". The function is available only on coded PATS. In that case to re-code changed ABS, it must be paired as well. OBD2 Diagnostics Wiki diag. Create account or Sign in. Fold Unfold. Click here to edit contents of this page. Click here to toggle editing of individual sections of the page if possible.
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Something does not work as expected?
Find out what you can do. General Wikidot.This may be caused by several different items. Utilize the pinpoint testing found in the appropriate Service or Workshop Manual for proper troubleshooting. Refer to the following for supplemental pinpoint details.
Follow Spare Key Programming Procedure from the chart. No parts should need to be replaced for this code. Large metal objects, additional PATS keys, or devices to purchase gasoline located on the customer's key chain can cause interference. Instruct the customer to keep such items from touching the ignition key during engine start.
It is not necessary to remove the objects from the customer's key chain. Remote starter equipment can also cause this fault code.
Remove any remote starter equipment close to the transceiver before conducting further diagnosis. Follow pinpoint test for troubleshooting. Cancel back to the previous NGS screen. Turn ignition OFF. Then disconnect the DLC. If DTC U is also present, it must be fixed first. Attempt to fix a U first as well, but it may not be required to fix this fault prior to the B Turn ignition off.
Cycle ignition 3 times slowly 3 seconds on, 3 seconds off to re-initialize the system. Verify that P is stored in PCM. If not, there is a possible power-up issue of the PCM i.
If the indicator is flashing, check to make sure the PCM is powered up and operating. If it's not, continue with PCM diagnostics. Note that this vehicle has a special ignition key. Replace ignition key, using the correct style. If the fault persists, replace the transceiver module. Erase continuous codes, cycle ignition, then retrieve continuous fault codes again.