Â«No BusÂ» message, all the lights on!

quebeccrd · **Posted:** Thu Feb 24, 2011 8:24 am

Today i was driving my CRD and all the lights in the dash went on and the "No Bus" message was showing on the odometer... Something else was showing on th EVIC as well, like J1850 No bus error

The jeep continue to run as usual, but nothing was working in the dash. The radio was still working.

No recent changes were made... i washed it yesterday with pressure hose. I got ECO Tune from green diesel engineering few months ago.

I tried to find an answer, but nothing was clear, so i'm asking you guys. Is there anything special with the CRD?

p.s.: i already posted this in the general discussion, but no answer yet, so i'm trying here...

Thanks

warp2diesel · **Posted:** Thu Feb 24, 2011 9:07 am

Check the harness plugs, make sure you did not knock one apart when you did the pressure washing. On my CRD, I knocked apart one of the AC harness connector plugs near the TCM and had no AC, pushed it back together after wasting hours of diagnostic time and the AC worked.
Check your fuses; the control modules like the BCM need power to operate, you might get lucky and the fix will be simple and stupid. Also check the relays that switch on the power, one bad relay can drive you nuts. There are basically two kinds of ISO relays used on the CRD, you may be able to swap them and find the bad one.
Water getting to relays can also cause problems. Water dripping out is a dead give away.
If you go to a Dealer, they have to go through the Diagnostic Flow Chart and test every thing that may be remotely related to keep the Chrysler Bean Counters Happy, even if they have a hunch it is a fuse, relay, or disconnected plug. You will pay a stiff price most of the time for them to go through the drill.
If you go to an Independent you are betting on his/her's past experience and luck in finding the problem. Some track the problem down and verify, others keep slapping on parts until it is fixed.
If you find a loose plug, bad fuse, or bad relay and the problem does not go away. Use the OBDII scanner after replacing the bad parts, to see if it brings part of the system out of a coma, this may let the OBDII scanner help you find the rest of the problem.

Good Luck and let us know what you find out.

Billwill · **Posted:** Thu Feb 24, 2011 9:51 am

I hope you did not get any water into your ECM connectors with your high pressure washer!

Although the connector is pretty well sealed it could be possible to get water in that area. I would suggest you disconnect the battery, unplug the ECM connectors and dry out the connectors with a hairdryer.
Previous to buying my Jeep I had a Landrover Freelander. The dealer decided to give it a good clean with a high pressure cleaner before I picked it up after a service....5 miles down the road it splutterd to a stop and had to be towed back...the ECM was fried and had to be repaired :evil:

I always wrap plastic around my ECM now and avoid spraying near it now when I clean the engine. :wink:

quebeccrd · **Posted:** Thu Feb 24, 2011 10:15 am

Thanks for the advice, but that would surpirsed me since i didn't open the hood while washing...

i will check all the fuses and relays tonight...

is it possible that that would never happen again?!!?

Sir Sam · **Posted:** Sat Feb 26, 2011 3:49 am

It sounds like you are loosing the data bus connection between the ECU/BCM and the gauge cluster and overhead console. Unfortunately if its intermittent it will be hard to diagnose. I would suspect that you have a wiring problem somewhere(like a chaffed wire) and not a problem with either the BCM or the ECU.

If it starts to become more prevalent then you can think about tracking down connections with the FSM connector pinouts and a multimeter.

The good news is that if you find the part of the circuit that is bad you can run a new jumper wire past that area and fix the problem easily.

Â«No BusÂ» message, all the lights on!

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