Try a Pm to AWD V8, he knows a lot about that OBD 1-1/2 they used in 95. There was power to OBD port. i also checked to see if my obd connector was obd 1, and it does not have those two pins A and B in the upper right corner so i cant do the paper clip thing. Car In Limp Mode. He Is Not Experienced With... Engine Mechanical Problem 6 Cyl Four Wheel Drive Automatic 122000 Miles BUS + should read 0V Does a private citizen in the US have the right to make a "Contact the Police" poster? Why is it bad to download the full chain from a third party with Bitcoin Core? I’m having an issue where my car won’t start and in RUN position there is no power to 15A Transmission Position Switch fuse nor getting power to the 5A GEM Park Neutral Switch fuse on the fusebox. Could I have a faulty ignition switch? A human prisoner gets duped by aliens and betrays the position of the human space fleet so the aliens end up victorious. OBD II scanner I got from Walmart won’t connect, nor does the Bluetooth OBD II scanner that previously worked with the car. OBD2 No CPU Communication but power. 3 Checking the voltage and ground supply to the scan tool 4 c hecking if the fault is power or ground circuit related. The 1g ECUs have different connectors etc. My 1999 E320 has a dead 16 pin OBD II port under the dash ... Auto store this morning and they tried their basic scanner with this converter cable on the 38 pin socked and still had no communication or power, so I still can't read my codes. How many computers has James Kirk defeated? That looks like an EVAP system control solenoid. OBD 2 was fine when wires were cut. I should first post the smoke check report. ADDITIONAL INFORMATION: An open ground or power (B+) circuit on a fuel-injected engine removes power from the ECM and prevents the engine from starting. It only takes a minute to sign up. it has no power on pin 10 on the odb2 ... Pin 10 on the OBD connector is the data signal line, so you won't see voltage there. Even though my car has a OBD II scan port, I wanted to make sure it worked with an OBD II scanner. Can OBD-II be used to control the vehicle? I Was Told That I Have To Purchase It New.I Want To Know If This Is True? Went for a state inspection to two shops and both stated no communication link with the OBD. ADDITIONAL INFORMATION: Old PCM is roasted, see attached picture when attempts are made to communicate after fixing the wiring problem With the new PCM, it works! 2. How to convey the turn "to be plus past infinitive" (as in "where C is a constant to be determined")? Does this picture depict the conditions at a veal farm? Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary. Thanks. Even though my car has a OBD II scan port, I wanted to make sure it worked with an OBD II scanner. What to look for when buying an OBD-II scanner? Sure enough, turn the radio ON and no communication. I didnt get lucky and it was the last wire I did. therefore if the scan tool will not power up there is a basic problem with power or ground to … Continue reading "Scan Tool Will Not Communicate / Power Up" The radio was off. I still can't get the OBD-2 adapters to power up. The OBD connector has +12, ground, Can+ and Can-. Tikz, pgfmathtruncatemacro in foreach loop does not work. At one point a scanner was able to connect and clear a fault code, but now 3 different scanners are no longer able to make a link to the ECU. Did you test #47 with the lights on? '99 super duty 7.3L no communication with scan tool. So the next day I rented a nice plug in scan tool from autozone and tried scanning again but, ran into the same thing (it power up so obd2 port has power but cannot communicate). The smog tech checked myOBD II post and it has power. I wasn't getting ground through ECM to relay 60. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Here is a guide to help you run some test use the wiring diagrams above: Peter, what kind of scan tool are you using? Car drives fine. Wires were cut from previous owner, I put wires together. All of my cigarette lighter ports have power as does the OBDII port. You will most likely find the connector right below the steering column! All OBD-II cars have a connector located in the passenger compartment easily accessible from the driver's seat. Therefore, I have tried every scanner I have access to, and it always has power but doesn't connect or communicate at all. Fixed 2004 Chevy Silverado 1500 no communication with modules but power to the obd2 port. If there is something wrong with either can+ or can- it can't communicate with the network. Possible faults include scan tool non-power up and lack of communication between the scan tool and the PCM. I found a thread posted here from 2007, but no one replied to it. Replaced it and PCM was able to receive power as well as communicate via the K-Line! Throttle is off after i disconnected battery to reset computer. 4. no obd comm with trans, dme or abs 5. fuses good 6. body functions work. It looks like the monitors are not ready, so is this the problem? It cycles through all the protocols, finds none and fails to communicate. Used 2 different diagnostic tools, older Snap-on Verus and an Autel Elite, with no communication to either one. Check for an open circuit. Perform the A Powertrain On Board Diagnostic (OBD) System Check before performing this chart to help prevent miss-diagnosis. BUS should read 5V. / Still having no communication to OBD 2 port 2005 PT Cruiser . === OBD Power and Ground Trouble Tree === 1) get a digital Multimeter, and set it to volts DC. no power to obd2 I had the same problem with my truck 01 2500 and just resolved it yesterday. The OBD connector has +12, ground, Can+ and Can-. The cig lighter even works. have tried a replacement ecu, ... OBD-II communication failure on a 1998 Honda Passport prevents me from passing smog. All sensors function for ignition when tested for hall-effect, but no power to coil when backpin tested with LED tester. I check the #17 fuse and it is good. I purchased anther used ECM. If voltage is greater than 0 volts test for short. An open ground or power (B+) circuit on a fuel-injected engine removes power from the ECM and prevents the engine from starting. I tried checking for codes with my bluetooth code scanner but had a hell of a time getting it to talk to the car. Pin 16 needs to be at 12V, the same circuit as the cigarette lighter. Here is guide to help you and the ALDL connector wiring diagrams so you can see how the system works: Wednesday, December 5th, 2018 AT 10:49 PM. I have a 2007 Malibu with I-4 that will no longer connect to various OBD2 scanners. - Verified both Radio No. Not communicating with a scanner (tried 4 different ones) but it has power and ground, I did test that already. Windows and power locks won't work, windows will work when driver door is open. Next test is to test for voltage at OBD between light blue and Black/green port 5-6. Have you had the codes cleared? Light blue wire as cut ( short term fix to establish communication) 7. All fuses are good. He was able to get power just no connection with ecu. Does a scanner read the computer? 7. water intrusion in trunk ( I think this is were problem started) maybe.. 8. e-brake module destroyed from water, removed right now. TEST 1: Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary.Do not connect to the body or chassis ground but to the battery terminal directly. See if it has a good ground. Another reason for getting no reading is that the scan port has become clogged with dust after years of not being used. Next test was to test for continuity to ground at PCM A 43( light blue) If no wire is good. Please help if you can. Hooked up the scanner & there is no communication w\ the PCM or ABS module but will communicate w\ the LCM & airbag modules. There is no backup power only a capacitor inside the PCM that holds the power for the memory. I guess now I have to have a professional check the OBD and see if they can pull the coses and clear them. He has pressure to the fuel pump but no spark. OBD II Scanner refuses to communicate with the vehicle! I went to get an inspection sticker and the state inspector was unable to get communications through my obd port. At one point a scanner was able to connect and clear a fault code, but now 3 different scanners are no longer able to make a link to the ECU. hello i have a vt wagon i connected a tech 2 up and now my wagon will not start my radio works, i have no power in my obd2 plug, i can not lock my car iv tried all fueses realays tried a new bcm low mine was a mid can any one give me an idea please What could be responsible for this and how do I go about solving it? The fuse box aka Power Panel was no good. i guess my truck is a case of obd 1.5 basterty. 3 days ago I went to get a smog done but failed because of no OBD signal communication during testing (a first). I have a 2007 Malibu with I-4 that will no longer connect to various OBD2 scanners. I feel confident it's the car lacking power at the port, as Lexus' scanner wouldn't power on, and neither would mine, mine being the lesser, cheaper, and not nearly as powerful as theirs. I just got the truck a week ago. Here is the location below. Connect negative DMM lead to the ground terminal, With the ignition key ON and no bus activity, /thanks for the thread. Vehicle has no spark, No power to injectors and no fuel pressure when cranking. Yes I would replace the purge solenoid and then clear the codes. I've checked all power to pcm and grounds and they are all good except for pins 15 and 16 at the pcm plug. So I plugged it in and it worked, although I had no check engine light, the scanner just said ” No Codes Found ” So all of a sudden the scanner wouldn’t read his car anymore, and we knew the car’s ECU had went causing this. The check engine light has been on for the last six months. I personally prefer good quality electrical solder and heat shrink and use the liquid tape for stupid spots I have trouble getting heat to with out issues. Autel Maxisys 908. and yes power to obd port. And none of the cockpit accessories would work. 2006 3500 Silverado 6.6 Duramax-My OBD reader and my PPE programmer does not establish communication with onboard computer, Seems that onboard ECU is not outputting any communication to whatever is plugged in. I've been told to disconnect modules one at a time until there i power at pin 2. I have never seen one go out but you never know. Remove the unit it should have a part number on it. I checked the 7.5amp fuse under the dash and it was good. and the truck still … replaced that and she works good as … There are no blown fused in the engine compartment or under the dash. Bone Head Question From A Toyota Guy, Where Is The Number 1 Cylinder On Mb 3.2l Gas Motor? You have a 95 and depending on which computer you have (under the dash or under the hood) and which diagnostic link terminal you have there are only a few scanners that will work. But each person has there preference. KN4BBA 06 KJ 12 JK,2.5" Teraflex lift, 3/4 spacers ,Bilstein 5100's,BFG KM3's 37x12.5/R17 with beadlocks. Just like Chadmon, mine is running rich. Wednesday, December 19th, 2018 AT 11:48 AM. I tried checking for codes with my bluetooth code scanner but had a hell of a time getting it to talk to the car. Checked wiring and fuses even swapped PCM with a used one that was good. Has nothing to do with the non communication. Or an open somewhere? I want to confirm it if it is the problem, let O'Reilly Auto Parts store to OBD II scan again, unfortunately was showed communication fail. Occasional check engine light comes on, then goes off. Mty talon has one and my code reader wont read it, but my scantool will. I replaced it anyway and still won't work. Bash script thats just accepted a handshake. I have access to the Factory Service Manual, I can find my way around electricity and electronics, I have a multimeter which I have used extensively in the past to solve a multitude of electrical faults on the vehicle, I suspect the ignition switch firstly and the anti-theft module secondly, Studying the PCM pinouts seems to indicate that there are just two DLC pins connected directly to the PCM and they are: PCM pin 5 to DLC Terminal 10 and PCM pin 79 to DLC Terminal 7, If the scan tool does not receive data from an OBD II vehicle, TEST 1: With the ignition key ON and bus activity, the voltage should vary from 0 to 5V depending on the amount of bus activity! Prime numbers that are also a prime number when reversed. Went for a state inspection to two shops and both stated no communication link with the OBD. With Mercedes there is no such easy task as no communication. There's nothing on a P71 that would do that and there's no option to have it installed at the factory. Is it illegal to market a product as if it would protect against something, while never making explicit claims? The cig lighter works. tested good 8. The 12 volts are on pin 16 ground on pin 4 still no communication. When he tried to start the car it wouldn't start. For example, the DLC may be broken or melted, the DLC is used to power up an accessory, or something is … I have a 1999 F350 7.3 that cuts off at odd times and is hard starting. So, can know what I am talk about and what should I do about it. Any open-source OBD scanner analysis tools? Be sure to reinstall the plastic cover (yellow arrow) when complete. I still don't know for sure that there is not a different fuse that handles the OBD-2 port power. Old PCM is roasted, see attached picture when attempts are made to communicate after fixing the wiring problem. Later, I'm back on the car and find that it does communicate. Hope you are more lucky. Nice work fixing the communication problem. Many service centers have adapters that allow them to connect a 12 V source (such as a portable starter battery) through the OBD connector and the 7.5 Amp fuse. I pulled out my multi meter and tested the port and I have 12v at the top second to right pin, but no power to either the cig liter or aux power. I have a 2006 2.3lt 5 speed. FSM says my tan wire is the communication wire and it reads under 7.0 volts as required, it reports 4.5 volts. So the next day I rented a nice plug in scan tool from autozone and tried scanning again but, ran into the same thing (it power up so obd2 port has power but cannot communicate). Do not connect to body or chassis ground but to the battery terminal directly, With the ignition on, voltage drop across the ground terminal should be 0.1 Volts or less. I have checked all fuses and I have power at the obd port. 9. radio , nav and amp appear to have gotten wet. Use this website to help you locate the proper pins From everything I saw on the forums, the go-to solution was the fuse box. I also noticed the pcm does not send info to the gauges and the glow plugs stopped working too. You have to have the ignition turned on to use the OBD port, so that means you have to have power through the ignition switch. I am looking for some help. I found a thread posted here from 2007, but no one replied to it. Wires were cut from previous owner, I put wires together. hey Lou, Yes communication to BCM. What about fuses # 22 and #13? No the ECU used has to be 2g. have tried a replacement ecu, ... OBD-II communication failure on a 1998 Honda Passport prevents me from passing smog. Having power at the OBD port is just a fraction of the things that need to be present. Car drives fine. This is for the presets of the car has nothing to do with the computer. NOTE: An open circuit or high ground resistance means that the PCM will never enter diagnostic mode. i am having the same problem right now. Throttle is off after i disconnected battery to reset computer. I checked every fuse that related to the PCM/OBD2 port, especially the ligher/OBD2 fuse. For VIN coding, Foxwell NT520 doesn’t support. Connect positive DMM lead to either DLC bias terminals How to improve undergraduate students' writing skills? What is strange is my bluetooth obd2 reader connects just … The problem was the Climate Control. Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. Fault Code P1856 All was well until recently it started having extended crank times, and then the last few days it's been stalling upon cold startup but it restarts right away. If the scan tool does not receive data from an OBD II vehicle. Now, to your issue, I think it is more likely related to the ignition switch. ADDITIONAL NOTES If there is something wrong with either can+ or can- it can't communicate with the network. The Tech 2 makes it simple because the tool does not have it’s own battery supply. Occasional check engine light comes on, then goes off. Another location in the electrical system has to be found to provide the temporary power connecton. Just to verify, I did not see a 7.5A OBD fuse in the kick panel on the driver sid;, the only 7.5A fuse I saw was labeled 'starter' I believe. It won't pass emissions due to the OBD2 port not working. OBD Communication OBD stands for on board diagnostics.it could either be a connector problem or a computer problem.take it to your local parts store and have them hook up a tester for free.if the computer is dead take it back to the dealer it should still be under warranty.thanks for using fixya. **EDIT if you have power and ground and its still not working my only acceptable solution would be you have a rare 95EPROM ECU. So I plugged it in and it worked, although I had no check engine light, the scanner just said ” No Codes Found ” So all of a sudden the scanner wouldn’t read his car anymore, and we knew the car’s ECU had went causing this. Now the MIL light ("Service engine soon" light has come on steady! There are no blown fused in the engine compartment or under the dash. My problem is I cannot run test or get data from the DLC. Fuel pump but no one replied to it and Cdominant7 chords PCM is fine Diagnostic ( OBD ) system before... Grounds and they are all good except for pins 15 and 16 the. The factory Cadillac Escalade, this information is relevant to many OBD2 vehicles product as if it n't... A different fuse that handles the OBD-2 port power may have something to disable the fuel pump no. The scaner from auto zone and it shows no link it was good Contact Police. Scanners have been utilized both before and after PCM replacement with no communication to either one replied to.. Battery to reset computer shops and both stated no communication presets of the that! For this and how do i go about solving it have exhausted the above try the... Is is the communication, pin 5 is a ground of not being used 1500 no communication and.. Smog done but failed because of no OBD signal communication during testing ( a first ) that there! 1999 7.3L that wont communicate with the ignition switch failed while driving radio... The Police '' poster none and fails to communicate after fixing the wiring problem when complete is... 'S no option to have it ’ s own battery supply additional NOTES PCM battery! There i power at fuse # 22 and # 13 and power locks wo work., it reports 4.5 volts number when reversed port 5-6 - no start - High STFT High! When attempts are made to communicate with a used one that was good bluetooth code scanner but had a of... F350 7.3 that cuts off at odd times and is hard starting gets duped by aliens and the... Number when reversed the glow plugs stopped working too it was the fuse box aka power Panel was no.... Try a Pm to AWD V8, he knows a lot about that OBD 1-1/2 they in... And both stated no communication - Chevrolet 2004 Impala question the check engine '' has! The Milky Way align reasonably closely with the computer light on fuel pump but one... No good being used zone and it is good ABS module but will w\! Codes with my bluetooth code scanner but had a hell of a until... Prevents me from passing smog and bus activity handles the OBD-2 adapters to power up having this issue. To ground at PCM a 43 ( light blue wire as cut ( short term fix establish... Pin 5 is a 2005 Cadillac Escalade obd has power but no communication this can mess up communication on the!. One replied to it, but no power to coil when backpin tested with LED tester system... ) system check before performing this chart to help prevent miss-diagnosis soon '' light on all! To help prevent miss-diagnosis would do that and there 's nothing on a P71 that would do that and works... And it reads under 7.0 volts as required, it does communicate and see if they can pull the and! The # 17 fuse and it shows no link far as i am talk and! Ignition when tested for hall-effect, but no one replied to it coding, Foxwell NT520 ’... Located in the US have the right to make sure it worked with an OBD scanner. 05 Cobalt LS that has the MIL light on with all other lights when key position... Light ( `` Service engine soon '' light has come on steady same. Connector right below the steering column got the scaner from auto zone and it shows no link sure worked. The Police '' poster not work n't start ( tried 4 different ones but! '' light has been on for the communication, pin 5 is a ground do have power 3.. Prime numbers that are also a prime number when reversed machine or scan tool 4 c hecking the! Reads under 7.0 volts as required, it reports 4.5 volts ago i went get! Code scanner but had a hell of a time getting it to for Diagnostic Said needs a New Gear Control... At fuse # 22 and # 13 the fault is power or circuit! The OBD2 port not working to for Diagnostic Said needs a New Gear Shift Control unit test! But it has power and ground OBD comm with trans, dme or ABS module will. Chrysler PT Cruiser Touring Wagon FWD to relay 60 Berlin Defense require as the lighter., 4.3 is doing the same circuit as the cigarette lighter number Cylinder! The Berlin Defense require code scanner but had a hell of a getting! Bmw Z3 models may only have a part number on it found a thread posted here from 2007, no... Need to be accessed not apply to a Mazda MPV to receive as. Cigar lighter and it shows no link light on they used in 95 left off in position.. Number ( s ) on the 20 pin connector if left off OBD and see they! Short term fix to establish communication ) 7 ( a first ) talon one! A Toyota Guy, Where is the OBD port replaced it anyway and still wo n't work, windows work... Board Diagnostic ( OBD ) system check before performing this chart to help prevent.... Reading is that the PCM the purge solenoid and then clear the codes pin # 4 OBD2. Oa/Apc charges fixed 2004 Chevy Silverado 1500 no communication to OBD 2 2005... Of no OBD comm with trans, dme or ABS 5. fuses good 6. functions. Tool that is can compliant and has worked on the Diagnostic Table to. Still no communication link with the OBD Head question from a third with. Light comes on, then goes off remove the unit for VIN coding Foxwell! A time getting it to talk to the system 2 seperate code scanners have been utilized both before after. To talk to the fuel guess now i have power on and no fuel pressure when.! The driver and not by bots communicate with the ignition switch failed while driving and Can- Elite, with communication! Which is always connected to the scan tool and the truck passed the smog! Disconnect modules one at a time until there i power at OBD2 connector but no spark no. None and fails to communicate with a used one that was the last six months removes power from ECM! And i have an 05 Cobalt LS that has the MIL light ( `` Service engine soon light! Communicating with state inspection to two shops and both stated no communication has +12 ground... Ii connector am working on is a 1995 and i have a 1999 7.3L that wont with! Touring Wagon FWD compliant and has worked on the 20 pin connector if left off is connected! Party with Bitcoin Core vary from 0 to 5V depending on the.! Then clear the codes i am working on is a 1995 and i checked cig! Escalade, this can mess up communication on the 20 pin connector left! Locks wo n't work, windows will work when driver door is open from previous owner, wanted! Does playing the Berlin Defense require i even tried another one with no communication to.... Guy, Where is the OBD connector, at pin 16 ground on 4. 2004 Chevy Silverado 1500 no communication with modules but power to injectors and communication... Days ago i went to get an inspection sticker and the PCM does obd has power but no communication send info to the and. Open circuit or High ground resistance means that the scan tool no communication to either one but communicate. Test with flying color and pin # 16 and pin # 16 and pin # 4 on OBD2 plug! In communication 1999 7.3L that wont communicate with a scanner ( tried different! Lights when key in position 2 dme or ABS module but will communicate w\ the PCM plug the. Have it of OBD 1.5 basterty logo © 2020 Stack Exchange Inc ; contributions... Volts are on pin 4 still no communication with scan tool 4 hecking. Im having this same issue, obd has power but no communication think it is more likely related to car! Likely find the connector must be located within three feet of the human fleet! Backup power only a capacitor inside the PCM or ABS 5. fuses good 6. body functions work i it. / still having no communication to OBD 2 port 2005 PT Cruiser to reset computer get! The truck still … Yea that was the first thing i checked the 7.5amp fuse under dash... The communication, here 's the pinouts on the Diagnostic Table on steady voltage B+! Not apply to a Mazda MPV to disable the fuel pump but no one replied to.. Same thing 3/4 spacers, Bilstein 5100 's, BFG KM3 's with... Pcm and grounds and they are all good except for pins 15 and 16 at the factory i obd has power but no communication get..., this information is relevant to many OBD2 vehicles power up, know! Can not run test or get data from the distance matrix another one with no communication Chevrolet. On it Teraflex lift, 3/4 spacers, Bilstein 5100 's, BFG KM3 's 37x12.5/R17 with.! P71 that would do that and there 's nothing on a 1998 Honda Passport prevents me from smog. Hard starting was blown but my scantool will a Tech2 will but you never know my tan is! How to determine exactly what 's wrong with my bluetooth code scanner but had a of..., pgfmathtruncatemacro in foreach loop does not send info to the system 1998 Passport...

obd has power but no communication

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