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No bus on odometer, blinking engine light -- Help please!

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  #1  
Old 11-08-2013, 10:11 PM
phoenix9110 phoenix9110 is offline
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Question No bus on odometer, blinking engine light -- Help please!

Hello all, I'm new to the forums and need some serious help!

I'll cut to the chase. I have an 02 Dodge Dakota Sport 3.9L Auto with 170k miles on it. Its been the most reliable vehicle ever until now. I was stopped at a light and everything just shut off...instantly. No warning.

I am now stuck with a 'No Bus' on the odometer, a blinking engine light, and no fuel pump sound when the ignition is flipped on(no start).

It will crank and crank and crank, but it'll never start.

My code reader wont work because of the no bus communication error between my cluster and my pcm. My battery is fully charged and almost brand new. The needles in all of my gauges stay at the minimum level with the ignition on.

Help Please!!!
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Last edited by phoenix9110; 11-09-2013 at 11:59 AM..
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  #2  
Old 11-08-2013, 10:51 PM
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98DAKAZ 98DAKAZ is offline
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sounds like a dead fuel pump

But may be an ignition problem or dead PCM
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Old 11-09-2013, 12:13 AM
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I had no-bus, had to replace my PCM. Got a rebuilt.
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Old 11-09-2013, 12:37 AM
phoenix9110 phoenix9110 is offline
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I've done a little research and it may sound like a dumb question, but would the ignition coil cause the blinking engine light?(some type of misfire)
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Old 11-09-2013, 01:31 AM
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'No Bus' on the odometer sounds more like a dead PCM. If you keep your Dakota long enough you will have this problem sooner or later.
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Old 11-09-2013, 02:48 AM
phoenix9110 phoenix9110 is offline
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No bus could be anything under the rainbow not letting the computer communicate with the cluster. That's why I gave more details on top of 'no bus'. Other threads state just going straight to the pcm for the problem is a crappy move.

10 minutes at a dodge dealer would have surfaced the pcm answer.

I will test my ignition coil and fuel pump in the morning however.

If I could get a little more insight on this it'd be much appreciated.
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Old 11-09-2013, 10:33 AM
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Verify that engine again? You say "coil" singular but the 3.7 had coil packs.

Do you have 3 or 4 connectors at the PCM?
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Old 11-09-2013, 11:53 AM
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Pretty sure he meant 3.9.

The 3.7 wasn't available in 02 right?
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Old 11-09-2013, 11:59 AM
phoenix9110 phoenix9110 is offline
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Sorry for the mix-up. It was late last night, and it IS the 3.9L. 3 plugs on the PCM.
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Old 11-09-2013, 12:40 PM
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That's better. The 3.7 wasn't available in '02. I wasn't sure if you had some "oddball" early vehicle.

The CEL flashes for a misfire but if you're not running it can't detect one.

Do you have spark? It could be the ASD relay but the problem is, that shouldn't kill the PCI bus. Check the cam/crank sensors and harness closely. They can fail and short out the 5 volt supply.
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Old 11-09-2013, 01:13 PM
phoenix9110 phoenix9110 is offline
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When you ask if I have a spark, are you meaning ignition coil or plugs?

The ignition coil is reading a resistance of ~1 with my voltmeter.
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Old 11-09-2013, 01:58 PM
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Do you have spark at the plugs?

What's the secondary resistance on the coil? That's the primary side judging by your reading and is within spec.
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Old 11-11-2013, 04:02 PM
phoenix9110 phoenix9110 is offline
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I do have spark at the plugs. I won't be able to test secondary resistance until later this evening.
Would my fuel pump prime even if my pcm wasn't communicating with the cluster?
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Old 11-11-2013, 04:36 PM
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If you have spark at the plugs odds are the coil is fine. It should be a nice bright blue?

The PCM turns on the fuel pump relay when you turn the key ON but it will turn it off unless it's running or cranking after a few seconds.

Try this, unplug your crank position sensor and see if the the "no bus" goes away.
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Old 11-12-2013, 09:16 PM
phoenix9110 phoenix9110 is offline
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Yep, plugs are sparkin up just fine.

'No bus' still comes up with crank sensor disconnected. Just for more info I can also add that my abs and regular 'brake' light come on with the 'no bus'. Not sure if this helps at all!
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Old 11-12-2013, 10:03 PM
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How about the fuel pump? Do you hear it?

If you have spark, all you need is fuel and it should fire up. Give it a shot of starting fluid and see what it does.

The ABS light is likely on as a result of the no bus message. It will come on with a communications error.

Do you want to check the 5 volt supplies? On the crankshaft and camshaft position sensors, pin #3, the orange wire should be +5v. Pin #2, the black with light blue wire is the sensor ground.

On the MAP, pin #3, again the orange wire is +5v. Pin #1, black with light blue tracer, is the ground.

It really looks like either something is shorting out the PCI bus, and it can be any module on it, like the CAB, PCM, CTM, Airbag, console, TCM, etc.
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Old 11-12-2013, 10:21 PM
phoenix9110 phoenix9110 is offline
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I have previously checked the 5v supply on my sensors and they seem to all be in working order.

My fuel pump does not prime on the switch of the ignition.
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Old 11-12-2013, 11:28 PM
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Quote:
Originally Posted by phoenix9110 View Post
I have previously checked the 5v supply on my sensors and they seem to all be in working order. My fuel pump does not prime on the switch of the ignition.
Swap out the fuel pump relay in the PDC with one of the others.

Disconnect the cam position sensor if you haven't. It controls the fuel sync and could short out.

After that, I'd be looking at the PCM as it should be turning on the fuel pump. I can't see it being a wiring problem.
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Last edited by 00DakDan; 11-12-2013 at 11:34 PM..
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Old 11-13-2013, 12:25 PM
phoenix9110 phoenix9110 is offline
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So... With cam and crank sensors disconnected and my ignition engaged, it should still prime my fuel system?
If i'm reading you correctly.
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Old 11-13-2013, 01:07 PM
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The idea is to eliminate something that can kill the PCM.

Your PCM should be priming the system at key on.
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Old 11-13-2013, 01:07 PM
 
 
 
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camshaft, crankshaft, fuel pump, no bus, pcm

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