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| My durango odometer says "no bus" http://www.obd-codes.com/forums/viewtopic.php?f=2&t=724 |
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| Author: | idunnoknow [ Tue Jul 11, 2006 3:23 pm ] |
| Post subject: | My durango odometer says "no bus" |
I have a 99' dodge durango and recently it has been dieing at the most random times wheather im driving or just stopped at a light, and when it dies the gas needle goes straight to empty and wont start for at least fifteen minutes, it will try to start but it acts like it ran out of gas. In the odometer it will say "no bus" but that is all and i dont have the owners manual anymore so i have know idea what it means i think it might be the fuel pump but there exspensive and i want to have more than a girly hunch thats what it is before i try to get another pump if you have any idea please let me know thanks, leslie |
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| Author: | Autotech1971 [ Thu Jul 13, 2006 8:16 pm ] |
| Post subject: | |
Hi Leslie I looked in my repair information and found this, there seems to be alot of testing.... Hope this helps Vehicle: 1998 - 1999 Dodge Durango 3.9L 2000 - 2001 Dodge Durango 4.7L 1998 - 2000 Dodge Durango 5.2L 1998 - 2001 Dodge Durango 5.9L Symptom: Engine will not start. Gauges are inoperative. No BUS message displayed on odometer. System: Body/Chassis Electrical, Emissions/PCM/Fuel, Engine Electrical Codes: N/A Problem 1 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Crankshaft Position (CKP) Sensor. Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) sensor. If 5v is not present, unplug the Crankshaft Position (CKP) Sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the CKP sensor. Problem 2 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Camshaft Position (CMP) Sensor. Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the Camshaft Position (CMP) Sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the CMP sensor. Problem 3 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Manifold Absolute Pressure (MAP) Sensor. Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire (5v power supply) at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the MAP sensor. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the MAP sensor. Problem 4 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Throttle Position Sensor (TPS). Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire (5 volt power supply) at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the TPS. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, replace the TPS. Problem 5 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted wire. Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the throttle position sensor (TPS) or manifold absolute pressure (MAP) sensor. If 5v is not present, unplug all sensors that are connected to the 5v power supply and disconnect the PCM. Check if either 5v power supply circuit is shorted to ground using a DVOM. If the circuit is found to be shorted to ground, repair the wire and the cause of the short. Problem 6 of 6: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Governor Pressure Sensor. Test & Fix: If the 5v power supply circuit is shorted to ground, the CCD bus is unable to transmit messages and the Powertrain Control Module (PCM) appears to be "dead". The PCM is not damaged when the 5v power supply gets shorted to ground, but does need to be reset by turning the key off for 10 second after the short is removed. Using a DVOM or labscope, measure the voltage on the 5v reference wire at the Throttle Position Sensor (TPS) or Manifold Absolute Pressure (MAP) Sensor. If 5v is not present, unplug the large round connector on the driver's side of the transmission. Turn the key off for 10 seconds. Turn the key on and measure the voltage on the 5v power supply circuit. If the voltage is now 5v, remove the transmission pan and check for shorted wiring inside the transmission. If the wiring is OK, replace the Governor Pressure Sensor. |
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| Author: | jaytm2 [ Mon Jan 26, 2009 2:17 pm ] |
| Post subject: | Re: My durango odometer says "no bus" |
I know this post is from a few years ago, but for everyone searching for help because thier Durango keeps dying, here's some info. The PCM (power control module, aka main computer) can get hot, causing a short or broken circuit inside the module. Replacing the module will fix the problem. If your truck seems to die randomly when it's hot outside, but will start back up after it cools down, this is probably the problem. I would even cool the PCM (near the passenger side wheel under the hood) down with water to get the truck to start up again. I've also heard a lot about one of the sensors causing a short as mentioned here, but I would think if the heat is a factor, this wouldn't be the issue. It would be nice though, if someone would post exactliy how to test for the 5v on the sensors. All the other info doesn't do any good if you don't know where to test for the 5v. |
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| Author: | jeff compton [ Mon Feb 02, 2009 10:35 am ] |
| Post subject: | Re: My durango odometer says "no bus" |
Crank sensors almost always fail when they get hot! Most often it's not the pcm! |
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| Author: | wildchildz [ Sun Mar 08, 2009 8:43 am ] |
| Post subject: | Re: My durango odometer says "no bus" |
Where is the crank sensor located?? wildchildz |
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| Author: | jeff compton [ Tue Mar 10, 2009 4:38 pm ] |
| Post subject: | Re: My durango odometer says "no bus" |
depends on year, engine etc of your vehicle! |
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| Author: | wildchildz [ Thu Apr 09, 2009 3:15 am ] |
| Post subject: | Re: My durango odometer says "no bus" |
It's a '99 Durango. Engine type is V-8, 5.9. Replaced the fuel pump, still won't start and gauges don't register. So, how do you test for the 5v?? |
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| Author: | jeff compton [ Sat Apr 11, 2009 1:59 pm ] |
| Post subject: | Re: My durango odometer says "no bus" |
with a dvom! |
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| Author: | AndyD5 [ Sat Apr 11, 2009 10:17 pm ] |
| Post subject: | Re: My durango odometer says "no bus" |
Jeff at the risk of feeling like and idiot! what is a dvom? Digital Volts Ohm Meter ?? |
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| Author: | Mohawkmtrs [ Sun Apr 12, 2009 6:08 am ] |
| Post subject: | Re: My durango odometer says "no bus" |
Yup. |
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| Author: | jeff compton [ Sun Apr 12, 2009 9:02 am ] |
| Post subject: | Re: My durango odometer says "no bus" |
Should be an acronyms page within the first chapter of any good repair manual and if you get one it'll show you where the crank sensor should be. |
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