Why is my Jeep PCM not working properly?
If the problem was only with the scanner connection, the jeep would at least run normally. Now these 2 problems combined would lead to think that there is some electrical connection problem with the PCM. I would disconnect the battery and then disconnect and clean the PCM connectors with electrical contact cleaner.
What to do if no communication through OBD connector?
If non-communications persist then do this: If this all checks out good, then you will have to verify all power and ground circuits AT the Powertrain Control Module (PCM) connector and verify continuity on the wires between the data link connector and the PCM. If it comes down to this, post a reply to this solution and let me know.
Why is my OBD 2 scanner not working?
Look in the connector and make sure you don’t have a pin that is bent and not making contact. You could also have lost the connection on the back of the OBD plug too. From what I’ve read around, a bad CPS will actually stop the OBDII from working.
Why does my Jeep Wrangler JK not start?
Jeep Wrangler JK Won’t Start One Click If your Jeep won’t start and you simply hear one click, then you could have a faulty starter motor. Again, using a voltmeter with a load function, make sure all your voltages are all correct.
Is there a problem with my YJ Wrangler?
A common problem with YJ Wranglers – turn the key and it doesnt start or it takes a few minuted to fire up Sometimes called “Lazy PCM”. Some simple tips and a certain way to tell if it is you ECM going south. I discuss “Forums” and a redneck tool from the Redneck Garage
What to do if your Jeep Wrangler wont turn over?
OWNER NOTIFICATION BEGAN APRIL 8, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT DAIMLERCHRYSLER AT 1-800-853-1403. To diagnose, you first need to determine if the problem is electrical or fuel related.
If the problem was only with the scanner connection, the jeep would at least run normally. Now these 2 problems combined would lead to think that there is some electrical connection problem with the PCM. I would disconnect the battery and then disconnect and clean the PCM connectors with electrical contact cleaner.
What should I do if my Jeep Wrangler wont start?
If the battery seems to be intact, you cannot identify the noises your engine makes when it is started and you cannot discover any defective cables or an empty tank, you should leave the diagnosis to experts. In the workshop, a mechanic can probably find out what the problem is in no time and then get rid of it.
A common problem with YJ Wranglers – turn the key and it doesnt start or it takes a few minuted to fire up Sometimes called “Lazy PCM”. Some simple tips and a certain way to tell if it is you ECM going south. I discuss “Forums” and a redneck tool from the Redneck Garage
How to reset your Jeep ECM ( Engine Control Module )?
Here is a little summary of it , the ECM is the brain of the vehicle and just like everything else you’re going to have to reset it and test it to make sure it’s in a great working condition. To reset your Jeep ECM you’re going to have to follow a couple of easy steps and you’ll be done before you even know it.
What to do if your Jeep Grand Cherokee wont start?
First get new batteries for your keys; there might be a little screw. After trying new batteries for the keys, DISCONNECT THE BATTERY AND WAIT ABOUT TEN MINUTES; RECONNECT BATTERY AND START CAR. This should at least get you to where you need to go.
What causes a no crank or no start condition?
A no crank or no start condition may develop due to electronic lockup of the wireless control module (WCM), also referred to as the Sentry Key Remote Entry Module (SKREEM). When this module fails the remote keyless entry system will also not operate. The WCM is commonly replaced to correct this concern.
Is the Sentry Key remote entry module ( WCM ) replaced?
This bulletin involves the replacement of the Wireless Control Module (WCM), and if equipped, the replacement of the Electric teering Column Lock (ELV). The WCM is also referred to as the Sentry Key Remote Entry Module (SKREEM). The customer will experience a no engine crank AND a no engine start condition.
Here is a little summary of it , the ECM is the brain of the vehicle and just like everything else you’re going to have to reset it and test it to make sure it’s in a great working condition. To reset your Jeep ECM you’re going to have to follow a couple of easy steps and you’ll be done before you even know it.
How do you reset the WCM on a car?
This condition is corrected by the replacement of the WCM. Until the WCM is replaced, the WCM may be reset (unlocked) by either: disconnecting and then reconnect the battery negative cable at the battery, or by removing the IOD fuse (with the key out of the ignition switch), waiting 30 seconds, and reinstall the IOD fuse.
This bulletin involves the replacement of the Wireless Control Module (WCM), and if equipped, the replacement of the Electric teering Column Lock (ELV). The WCM is also referred to as the Sentry Key Remote Entry Module (SKREEM). The customer will experience a no engine crank AND a no engine start condition.
This condition is corrected by the replacement of the WCM. Until the WCM is replaced, the WCM may be reset (unlocked) by either: disconnecting and then reconnect the battery negative cable at the battery, or by removing the IOD fuse (with the key out of the ignition switch), waiting 30 seconds, and reinstall the IOD fuse.
What to do if the OBD II scanner doesn’t communicate with the vehicle?
What to do if the OBD II scanner doesn’t communicate with the vehicle. 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.
What to do if your scanner won’t read?
Use your voltmeter to read from pin 16 to a good ground near the connector. If batt voltage is read – okay. Next, go from pin 16 to pin 4 (ground for the scanner) If batt voltage is read – okay. Repeat using pin 5 as ground.
Why does my car scanner say ” linking error “?
The car has no major mods.. I could figure out why It wouldnt read> I was about to give up and I tried telling the scanner my car was a 96 and it worked. It kept saying communications error unable to communicate with vehicle check power and grounds etc.
What to do if the OBD II scanner doesn’t communicate with the vehicle. 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.
Use your voltmeter to read from pin 16 to a good ground near the connector. If batt voltage is read – okay. Next, go from pin 16 to pin 4 (ground for the scanner) If batt voltage is read – okay. Repeat using pin 5 as ground.
The car has no major mods.. I could figure out why It wouldnt read> I was about to give up and I tried telling the scanner my car was a 96 and it worked. It kept saying communications error unable to communicate with vehicle check power and grounds etc.
How to reset your Jeep engine control module?
3- Once the time has passed you should now turn the headlights “on” and “off” twice to drain the Engine Control Module from any remaining power. 4- Now plug back in the negative terminal and your Jeep ECM should now be reset. To finish off this post , here are a couple of things you should keep in mind.
What’s the difference between ECM and PCU in a jeep?
The Jeep Engine Control Module, known as the PCM ( Powertrain Control Module) ECU ( Electrical Control Unit ) or to simply it put the Automotive Engine Computer . Confusing right? If you would like to know more about their differences you can read up on our previous post ” Difference between ECM, ECU & PCM ” which we covered it in details.
How often should I Reset my Jeep ECM?
For good measure. Anytime that you reset your Jeep PCM you should keep in mind that you will need to drive your car for approximately 10-15 miles so your Jeep ECM can re-learn your driving habits and fuel management. Good luck with your reset and be sure to share this with anyone that might be in need of it!
What kind of problem does a Jeep Liberty have?
:sick: I have a 02 Liberty 3.7L V6. about 85,000 miles on it. never had a problem till two weeks ago. driving down the road and the car just starts stalling with the RPM gauge going nutz, then the cabin fills up with gas fumes,blows black smoke only when it starts acting up, check engine lite stays on, but not blinking.
What to do if your Jeep Wrangler won’t start?
So…they went ahead and treated the upper engine with a high quality type of solvent. They had the ending running and pour this solvent into the engine until it completely died. They let it sit for about 4 hours. It actually worked for a long time, but now it has started acting up again, but very much less frequently.
Why does my Jeep Wrangler not run at 3
3- Once the time has passed you should now turn the headlights “on” and “off” twice to drain the Engine Control Module from any remaining power. 4- Now plug back in the negative terminal and your Jeep ECM should now be reset. To finish off this post , here are a couple of things you should keep in mind.
Why do I get No reading on my OBD codes?
Check your fuses to see if any have gone bad. Remember that your car or truck might have more than one fuse box. This should be covered in your owner’s manual or a proper service manual. Another reason for getting no reading is that the scan port has become clogged with dust after years of not being used.
Why is my OBD2 scanner not communicating with my car?
Each time I have tried scanning my vehicle for codes using the OBDII scanner, there is a message on the scanner stating that it is unable to communicate with vehicle. There are lots of issues with my car, but I am not able to correct them because of the OBDII issues.
What to do if your Jeep Liberty won’t start?
It is definitely worth it to use an OBDII scanner to check and see if the engine has thrown any trouble codes. It is highly likely that if your Liberty won’t start that there will be codes. These codes will tell you what the computer is saying is wrong with your engine.
What happens when a Liberty starter goes bad?
When a starter goes bad, they will usually not give you much warning first. Also, if you are stuck somewhere and are trying to start your Liberty, the old beat the starter with a hammer trick is not a wives tale. It really can get that one last start out of it. There are a lot of issues that can cause your Liberty to crank, but not start.
Why does my Ford liberty not start up?
While the battery cables are not necessarily the most likely issue to cause your Liberty to not start, they are some of the easiest to diagnose. You can take a look at the battery poles where the cables connect. If there appears to be green or white corrosion all around it, cleaning them may help get you back on the road.
Check your fuses to see if any have gone bad. Remember that your car or truck might have more than one fuse box. This should be covered in your owner’s manual or a proper service manual. Another reason for getting no reading is that the scan port has become clogged with dust after years of not being used.