Stratus question?????

[tempfixit]

I have posted this on the Stratus forum but no one has replied. My question is that the instrument gauges jump around intermittently. These are the codes retrieved:

1598 A/C pressure sensor voltage high
1684 Battery disconnected in last 50 starts
1687 No message received from mechanical instrument cluster
1695 No message received from body control module
1698 No message received form electronic transmission control module

The battery is original and has not been disconnected. I am thinking that the battery terminals are corrided. I have read different posts on the instrument cluster but seems more like battery issue. Am I thinking correctly or is there something else that I am missing??? A/C does not work either. Any advice would be greatly appreciated.

[RexNfx400]

Something is taking the bus down. The buss is the wiring thats between each module, basically. It has a very specific voltage and current it must stay with in. If it strays a little bit, then you loose bus. Usually, when a module goes down. It can take the communication bus with it. Usually, you unhook one module at a time untill communication is restored. Then you pretty much know what module is defective. I like to start with body and clutster controllers first.

[tempfixit]

Originally Posted by RexNfx400

Something is taking the buss down. The buss is the wiring thats between each module, basically. It has a very specific voltage and current it must stay with in. If it strays a little bit, then you loose buss. Usually, when a module goes down. It can take the communication buss with it. Usually, you unhook one module at a time untill communication is restored. Then you pretty much know what module is defective. I like to start with body and clutster controllers first.

Thanks RexNfx400 for the input. Do you happen to know what the buss voltage and current it must stay in?? I have the Haynes Manual> I have fiqured where the PCM and TCM are but I cannot find where the ECM (or is that part of the PCM) and the Body Control Module are. (or are you talking about relay's) By the way I forgot to mention it is a 2001 four door sedan with 2.7L engine and automatic trans. Thanks again for your help.

[RexNfx400]

You have to monitor the bus with a scope. To monitor power problems in real time. Its a little too much for me, to try to explain these workings. But its pretty much the same way your home computer is talking with each part inside of it. Processor talks to the video card to ram to hard drive and so on. This is done on a pci-bus. Just like the car. The easiest thing is, pull the module connectors off the network one at a time. To see if the remaining modules communicate with ECM. Other than that. You'll have to subscribe to Alldata or something to get the OEM type details of how the system works and where the modules(computers) are located. If you want to learn computer systems on your car, then it would be good to do a subscription to Alldata. But it might cost alot more in the long run than just dropping it off at an up to date shop.

[tempfixit]

Originally Posted by RexNfx400

You have to monitor the bus with a scope. To monitor power problems in real time. Its a little too much for me, to try to explain these workings. But its pretty much the same way your home computer is talking with each part inside of it. Processor talks to the video card to ram to hard drive and so on. This is done on a pci-bus. Just like the car. The easiest thing is, pull the module connectors off the network one at a time. To see if the remaining modules communicate with ECM. Other than that. You'll have to subscribe to Alldata or something to get the OEM type details of how the system works and where the modules(computers) are located. If you want to learn computer systems on your car, then it would be good to do a subscription to Alldata. But it might cost alot more in the long run than just dropping it off at an up to date shop.

Thanks again RexNfx400; I will check and clean battery cable ends, then decide if I will take to shop or get a subscription to tackel further. WIll post when find out fix. Really appreciate your help.