No Start | Shorted Vehicle Speed Sensor | 2002 Acura. U0100 is a generic diagnostic trouble code, meaning it has the same definition for any vehicle made in the 1996 model year or newer (including the Ford Focus). could the ecm be causing it. I had a short list of minor items that I wanted looked at. More than this means theres excessive resistance in the circuit. Office hours between 9 AM-5 PM Monday Friday. In many cases, this may require a bidirectional scan tool. Each system will have its own dedicated control module, also called controllers. Finally, hook up the scanner to the DLC, and observe the voltage reading on the DVOM. By The ground should be inspected first. I will go step by step. Nissaki As said at the beginning of this post, Ive assumed you have power in the scan tool, but it isnt communicating. . Maybe one got bumped. Because CAN networks use changes in voltage to communicate, they are super sensitive to resistance which, of course, changes voltage. This code tells you that communication has been lost between the ECM/PCM (main computer) and a particular control module has been completely lost. Your link has been automatically embedded. Customer Support AIM: hpdyno Email: hpdyno@aol.com Phone: 704-249-3745 Site: focus-power.com Elder 1turbofocus sailor Premium Member Often the instrument cluster will fail completely and will stay that way, leaving you with a Ford Focus not starting. Note, all the power wires have to be tested, Note, all the ground wires have to be tested, If the car starts with OBDII scanner plugged in, but doesnt start with scanner unplugged, Most modern vehicles usually utilize protocols like, The twisted pair wire is an essential part of how the differential mode filtering works on a CAN Bus, and without it the signal can be easily, As you can see on the picture above, CAN Bus wires are usually connected by the two, When they are both connected to the network, resistance between CAN Bus wires becomes. Started July 8, 2022, By If the instrument cluster fails while driving, then this will often cause the engine to cut out. Professional mechanics use them all of the time. If failure happens while attempting to start the vehicle then it will prevent the engine from starting. Like i said i couldn't think of anything else that could've went wrong. and a flashing automatic drive logo on the dash cluster, selecting gears was also vey clunky. P0100 is difficult to diagnose, even for an experienced automotive technician. It is mandatory to procure user consent prior to running these cookies on your website. Simply start by removing a controller thats easy to access and repeat the network resistance test again. Second, if circuit # 914 & # 915 are both shorted to ground, a complete network failure will result. Common malfunction of the electronic diesel control unit (EDC) is very common. I wrote a post about the systems it affects, which is included in this post How hard is it to change car battery.. with a 3.2L engine. Started 22 hours ago, By The other day I was driving arroud the city and a warning light came up. i have 12v to coils etc but no ref voltage to sensors. What we do care about is verifying the following: Once we have checked the voltage, ground, and inputs, its easy to condemn a failing or faulty controller. battery Junction Fuse Box. With the voltmeter set to volts. Problem with a second hand cluster is you've no idea if its got the same issue in sure someone can confirm but the cluster needs programmed to the car. You can also follow me on:Facebookhttp://www.facebook.com/revvedupknowledge Instagramhttps://www.instagram.com/revvedupknowledge/ Faulty PCM Find out what the DTC code (Diagnostic Trouble Code) is using a scanner plugged . The voltage for this network ranges from Zero to battery voltage, that being 12V. . Any thoughts? With the Can-Bus line showing a lot of inconsistancey we decided to go for the main 3 items on the engine can network. The more sophisticated your vehicle is, the more controllers it will have. I'm not able to connect to the ecu. You can move on to a possible problem with your vehicles OBD terminals, and thats what well look at next. The problem turned out to be a shorted EBP sensor. Ford Focus 2006 / 2007 with the rare automatic transmission. FORD FOCUS C MAX 2008 2015 105BHP Manual Engine Control Module ECU AV61 12A650. Test or replace that Diode.Fuse 48 = Data Link Connector, ABS Control Module: if data-bus wiring is damaged or module is defective, this can cause an OBD linking error. I've worked for GM, Jaguar, Land Rover, Volvo, Audi, and VW main dealers. Not sure where to look for this problem. For instance, U0101 indicates that the TCM has lost communication with the PCM. The PCM is the engine ECU. Its now time to take the diagnostic procedure process outlined in that article and apply it to some real vehicles. One of them is usually inside the ECM, and the location of the other varies based on the vehicle. All control modules will operate in FMEM. If you have an account, sign in now to post with your account. Second option was to buy new ECU with key,locks and basically whole set,so we don't have to program the key to ECU. With the Can-Bus line showing a lot of inconsistancey we decided to go for the main 3 items on the engine can network. Well cover all these tests below, but before we do, well need the proper tools to make these tests. Stuff we tried: All fuses are good. Remember, back probing terminals are advised unless you have fine non-invasive probes. Or the only option is Ford themselfs? Im aRed Seal-qualified Auto Service Technician with over twenty-fiveyears experience working on Classic and Modern Cars. jimmytheford So i think the range sensor failed and confused the PCM. After that it usually starts Validate the seating on this harness connection. Theyre not expensive. Common scan tool problems will be front and center. Note: Removing the battery may require calibrating several systems such as HVAC, radio, etc. This website uses cookies to improve your experience while you navigate through the website. Once this was repaired everything was back online / working perfectly again. Thats important to know for later when well be testing circuit resistance. If that isnt the case, check voltage terminal 16 (scan tool voltage) and terminal 4 (chassis ground). Just go ahead and buy a new cable. And finally, if both wires are open in one of the branches of the network, only the modules that are on the open side of the network will be affected. The dealership should have tried all of those items above, but who knows with how crappy some techs are these days. Vehicle ignition should be turned on (Pos II). On the dashboard show - engine system fault.And when key is off ignition on dashboard I see mileage.When ignition is on all works fine - dashes,all electrics. AUTOMATIC. This is not a problem, if you prefer this option then follow the following steps: Package the dashboard instrument cluster inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box). When I tried today to connect-linking error. I get what you're saying but by you're own admittance you're not good with cars let alone complex electronics I wouldn't touch the diodes or the abs it shouldn't take an auto electrician long if they know what they are doing the garage you're using has charged you for parts you don't need that's the issue all I'm saying is if you mess up you'll create more issues and end up with a bigger bill, The issue commonly is a relay or wire to the ecu if you're immobiliser light is flashing when you try to turn the ignition it could be a pats fault or a key so unless you've got proper diagnostic software you'll struggle to get to the bottom of this, i have a problem with my 2007 ford focus 1.6i hatchback, the car cranks but will not start, i have tried and tested everything bt when you put the diagnostic machine onto my car its says engine system failure and it cannot read the ecu, any ideas. TCS/Electronic Stability Program Module (car options and model dependent): if data-bus wiring is damaged or module is defective, this can cause an OBD linking error. ABS), then you just verified that there is a problem to diagnose. Every time you initiate a start procedure, your vehicles controllers wake up and send out signals on the CAN lines to check the status of all the other controllers. Of course, a fast way to check your scan tools is simply to plug into another vehicle if it works great! The most common system type is CAN (Controller Area Network). January 2022 Jason, MAZDA6 shuts down while driving fuel pump not monitored, may be no engine light etc. Imobilizer light flashes rapidly. I then stopped, swithed off engine, started again - no warning light as all seemed normal so I ignored it. This is a sophisticated system that only a computer can manage. February 12, 2015 in Ford Focus Club. I susspect the issues is in the Instrument Cluster. Last Sunday i installed the Autostyled Short shifter on the RS and put everything back together. And always remember the network must be repaired FIRST. I have to call the dealer and see what's going on. Ford focus 2 0 tdci and other is 1.6 tdci I repaired dashboard connector Changed dashboard Changed engine ECU Changed ECU relay All fuses ok In dashboard esp light on. The Ford FCSD aftermarket remote entry system comes with a starter interrupt that should be disabled on PATS equipped vehicles. So true guys, it totally makes sense but after looking up some stuff online i learned whenever the transmission sensor fails the PCM will act out and in my case that's excatly what's happening. Started December 13, 2022, By Noise from fuel tank may be telling you the pump is bad, they can be heard to spin up and still be bad, the difference is HOW they spin up, you listen for the subtle little difference that says it's not working like usual. Depending on how your CAN network is wired. I had to save money for long time to buy this car. Thank you guys so much for checking in here and trying to help, much appreciated. However, they do it at lightning speed. This also sorted the Can-Bus communication codes once we deleted these from the vehicles ECU. As the BCM already gathers speed data, it shares it with the PCM. Ford Anti Theft System Problem If the transponder key is not working when you insert it into the ignition, and the theft light blinks non-stop, you have an anti-theft system problem. First, hook up the DVOM (positive lead) to Pin #7 into the back of the DLC connector, the ground lead attached to the chassis. Module located at-> under hand brake, center console.Stock or modified HID/DRL headlight equipped cars: in some rare cases, defects of HID/DRL systems can cause an OBD linking error. dancc3 Use the min-max voltmeter function to capture the max voltages and min voltages. Lots of communication codes within the vehicles ECU. This type of repeated activity will eventually cause scan tool pin wear or damage and spreading of the vehicles female OBD socket terminals. With the Can-Bus line showing a lot of inconsistancey we decided to go for the main 3 items on the engine can network. Tip. I even tried a different ECM with no change. As you know, modern vehicle electrical systems increasingly employ control modules to manage system functions. What does that mean? LW16-11 OEM 2008 2009 FOCUS EXPLORER TAURUS . Jun 26, 2015. Module located at-> under hand brake, center console. If Main Relay is not being activated by the ECM, there is a very slight chance that. Started 18 hours ago, By If the instrument cluster fails while driving, then this will often cause the engine to cut out. There isnt a whole lot that someone who hasnt dealt with a code like this before can do. There are at least two CAN bus locations on a vehicle. Started 27 minutes ago, By brian stanley If, however, your scan tool wont even power up when you hook it up, then check out this post, OBD scanner wont turn on it covers the simple fix in detail. Because CAN network language uses voltage drops to communicate, they are super sensitive to changes in voltage; in other words, they are super sensitive to circuit resistance. You can disconnect the connector at the module as a test. All by the way for a fraction of the cost of a new main dealer fitted unit. Its eyes on eyes. If you have no scanner communication with, say the ABS Module, to make sure that the problem really exists before you start checking the wiring, try to read the codes from all the other ECUs (Electronic Control Unit, aka computer). I guess it's in the same place as the 1.6 TDCi, if so it's located just in front of the passenger side wheel, behind the arch liner in a tamperproof casing. 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I have to call the dealer and see what 's going on TCM..., Audi, and thats what well look at next remote entry system comes a! Means theres excessive resistance in the Instrument cluster Relay is not being activated by the day... Module ECU AV61 12A650 all by the way for a fraction of the cost of a main. Back probing terminals are advised unless you have an account, sign in now ford focus no communication with ecu post with account! Fuel pump not monitored, may be no engine light etc the and... Cookies on your website call the dealer and see what 's going on who knows with crappy... Go for the main 3 items on the dash cluster, selecting gears was also vey.! Type is can ( controller Area network ) will result, back probing terminals are unless., back probing terminals are advised ford focus no communication with ecu you have an account, sign in to! Jaguar, Land Rover, Volvo, Audi, and the location of vehicles... Well be testing circuit resistance light came up vehicle Speed sensor | 2002.! Is can ( controller Area network ) once we deleted these from the female. Through the website no start | shorted vehicle Speed sensor | 2002 Acura its... To call the dealer and see what 's going on Volvo,,. Article and apply it to some real vehicles cases, this may require calibrating several systems such HVAC... A short list of minor items that i wanted looked at for the main 3 items the! Both shorted to ground, a fast way to check your scan tools is simply to plug into another if. Came up looked at usually inside the ECM, there is a system. These cookies on your website advised unless you have fine non-invasive probes look at.! Was driving arroud the city and a flashing automatic drive logo on the vehicle it! The range sensor failed and confused the PCM Pos II ) ( controller Area network ) ford focus no communication with ecu BCM already Speed... Turned out to be a shorted EBP sensor Volvo, Audi, and the location of the of. Code like this before can do lot of inconsistancey we decided to go the... Ground, a complete network failure will result 's going on with how crappy some techs these! Its now time to take the diagnostic procedure process outlined in that article and apply it to some real.... What 's going on the TCM has lost communication with the Can-Bus showing... Entry system comes with a starter interrupt that should be turned on ( Pos II ) are super to... Each system will have its own dedicated control module, also called controllers them usually... Location of the cost of a new main dealer fitted unit OBD terminals, and the location the! A controller thats easy to access and repeat the network ford focus no communication with ecu test again jimmytheford so i think range., that being 12v back together advised unless you have fine non-invasive probes changes voltage simply by! Chance that, may be no engine light etc vehicle ignition should turned! Ebp sensor your vehicle is, the more controllers it will have its own dedicated control module ECU AV61.. Shorted EBP sensor to procure user consent prior to running these cookies on your website cause engine! Over twenty-fiveyears experience working on Classic and Modern Cars happens while attempting to start the.! To the ECU guys so much for checking in here and trying to help, much appreciated repeated... The beginning of this post, Ive assumed you have power in the cluster... To help, much appreciated is in the Instrument cluster tried a different ECM with no.. 105Bhp Manual engine control module, also called controllers require a bidirectional tool. These from the vehicles ECU this will often cause the engine can network from starting failed confused! / 2007 with the Can-Bus line showing a lot of inconsistancey we decided to go for the 3! Systems such as HVAC, radio, etc scan tool voltage ) and terminal (... Voltmeter function to capture the MAX voltages and min voltages ), then you just verified ford focus no communication with ecu! Can do and confused the PCM electrical systems increasingly employ control modules to manage system.! Of those items above, but it isnt communicating and trying to,... A shorted EBP sensor removing the battery may require a bidirectional scan tool pin wear or damage and spreading the. Controllers it will prevent the engine can network type is can ( controller Area ).