I have an 02 24v 6 speed, just did injection pump. Everything is good there. Cracked injectors got fuel to them, closed 3 off truck fired up. Took it for a test drive n everything was great, brought it back to the house, shut it off waited 3 mins and fired it back up nps at all. Shut it off cleaned up tools etc. Went to start it and now it won't start. Lots of fuel to injectors, but keeps saying "no bus" on instrument cluster. My super chips programmer can't even connect to it. Just cranks and cranks but no fire. Any help would be greatly appreciated.

How many main computers are on these motors/trucks that'd cause a no start and "no bus" on the instrument cluster? It's gotta be one of them I'd just like to be able to narrow it down to at least one

So why did you change your injection pump, was this problem present before you changed it. 

I believe no bus means ECM and PCM is not communicating. Does your wait to start light comes on instantly with key on, have you checked for AC noise or done WT ground mod. 

@Mopar1973Man would know a lot more about no bus thing.

Check the bolted wire harness connection inside the fuse box under the hood. The only time I ever saw "no bus" on my truck, I had to fiddle with this connection, take it off, clean, reinstall. It hasn't been back for me. Just one of likely many possibilities though.

8 hours ago, Coltenkrause said:

Lots of fuel to injectors, but keeps saying "no bus" on instrument cluster.

 

PCM and CCD Network issue. PCM creates the CCD Network bus and the instrument cluster will bias the voltage for the Bus. My first place to look the bolted connector in the PDC.

5 hours ago, Dieselfuture said:

So why did you change your injection pump, was this problem present before you changed it. 

I believe no bus means ECM and PCM is not communicating. Does your wait to start light comes on instantly with key on, have you checked for AC noise or done WT ground mod. 

@Mopar1973Man would know a lot more about no bus thing.

My injection pump died, never been changed had almost 500xxx kms on it. And no my wait to start light isn't coming on at all. My abs light is on now,engine light and my overhead display(tells KMS to empty, fuel milage etc) says CCD

4 hours ago, Mopar1973Man said:

 

PCM and CCD Network issue. PCM creates the CCD Network bus and the instrument cluster will bias the voltage for the Bus. My first place to look the bolted connector in the PDC.

alright I will check there first. I am new to the 24v world. Is that the one in the top rite corner with the bolt through it? 

4 hours ago, Mopar1973Man said:

 

PCM and CCD Network issue. PCM creates the CCD Network bus and the instrument cluster will bias the voltage for the Bus. My first place to look the bolted connector in the PDC.

alright I will check there first. I am new to the 24v world. Is that the one in the top rite corner with the bolt through it? 

34 minutes ago, Coltenkrause said:

And no my wait to start light isn't coming on at all.

Bad news. Your ECM is not booting up at all. The VP44 might be fine but the ECM is brain dead. Double check for a P0381 error code. This is for the WTS light if the bulb or circuit failure. 

 

38 minutes ago, Coltenkrause said:

is that the one in the top rite corner with the bolt through it? 

Yep. That be the one. That has the CCD network going back towards the cab.

20 minutes ago, Mopar1973Man said:

Bad news. Your ECM is not booting up at all. The VP44 might be fine but the ECM is brain dead. Double check for a P0381 error code. This is for the WTS light if the bulb or circuit failure. 

 

Yep. That be the one. That has the CCD network going back towards the cab.

Alright, I checked that it seems ok, no burns or corrosion in the plug, wires look good. Where is the ECM located? Easy to change by chance? I halfto head back up north to work n need this ole girl mobile. Also can't plug my reader into it (OBD2)it just says (connection failure check connections) it's an older style super chips

10 minutes ago, Coltenkrause said:

Alright, I checked that it seems ok, no burns or corrosion in the plug, wires look good. Where is the PCM located? Easy to change by chance? I halfto head back up north to work n need this ole girl mobile. Also can't plug my reader into it (OBD2)it just says (connection failure check connections) it's an older style super chips

Also everything seems fine when I first turn the key on, my KMS to empty read n then a minute later that's when everything changes n says CCD on my overhead and no bus on the cluster.

Edited May 10, 20195 yr by Coltenkrause

14 minutes ago, Coltenkrause said:

Where is the ECM located?

Driver side of the block just below the stock fuel filter housing.

 

14 minutes ago, Coltenkrause said:

Easy to change by chance?

2 bolts, one Allen screw holding the plug in. I would highly suggest to send the ECM to Auto Computer Specialist and they will test and tell you what is wrong with the ECM. Then repair what is needed. 

 

15 minutes ago, Coltenkrause said:

Also can't plug my reader into it (OBD2)it just says (connection failure check connections) it's an older style super chips

Double check the OBDII plug you could have a pin pushed out. I've had this happen with a Smarty Tuner. 

 

Sounds like ECM needs help, like mentioned above you can send it for repair to ACS, make sure you give them all present codes and specify exact problems you're having. Then you need to check alternator for AC noise and do a WT ground mod before you install your new ECM or it will go out again in short time and will not be covered under warranty. I would stay away from part store alternators, most are junk off the shelf. You can get original one online for under 200 or buy an aftermarket higher amp rating one from nations and some other places I can't remember. 

Wait wait wait. Slow down a second. Are you guys sure it's the ECM? I thought the bus originates at the PCM? Couldn't the wait to start light just not be showing because of the lack of data bus and lack of communication with the cluster? Same root cause as the "no bus" message? If the ECM was causing the "no bus" problem, couldn't you unplug the ECM and turn the key on to rule it out?

4 hours ago, kzimmer said:

Couldn't the wait to start light just not be showing because of the lack of data bus and lack of communication with the cluster?

 

Wait to start should display regardless of the CCD Network as long as power is supplied to the ECM the very first instruction is the WTS light for either bulb test or fire up the grid heater. WTS is not part of the CCD network but hard-wired from the ECM to the cluster light directly. Look at the two wire maps for the Orange/Black wire. 

 

 

 

 

Passing thought is possibly the main fuse for the ECM and PCM being blown or fuse element cracked. Then both the ECM and PCM be without power and would not do anything. 

 

 

Edited May 11, 20195 yr by Mopar1973Man

I tracked down a 6spd ECM, gonna try that n then the PCM. Turns out the one that's in there is out of a 01 6spd and it worked

 

Be careful there is like 52 different series of software for one year of ECM. 

14 minutes ago, Mopar1973Man said:

 

Wait to start should display regardless of the CCD Network as long as power is supplied to the ECM the very first instruction is the WTS light for either bulb test or fire up the grid heater. WTS is not part of the CCD network but hard-wired from the ECM to the cluster light directly. Look at the two wire maps for the Orange/Black wire. 

 

 

 

 

Passing thought is possibly the main fuse for the ECM and PCM being blown or fuse element cracked. Then both the ECM and PCM be without power and would not do anything. 

 

 

 

Take a look at that second schematic a little closer. That's not the ECM switching the wait to start light; it's the PCM. Like I said. Slow down a little bit here.

That's got to be a typo... Pin 37 on the ECM. Got to be a typo it's even showing pin 37 on the PCM. 

 

Edited May 11, 20195 yr by Mopar1973Man

37 minutes ago, Coltenkrause said:

I tracked down a 6spd ECM, gonna try that n then the PCM. Turns out the one that's in there is out of a 01 6spd and it worked

 

It's OK to temporarily test it like that, not recommended to leave it without reprogramming it to your truck.

I love when schematics are wrong...

I hate when I find wrong information.  

 

Just like the schematic for the 2002 oil pressure sensor is a single wire not a 3 wire. Then all the weird stuff we already changed the rules on like minimum fuel pressure, etc. 

On 5/10/2019 at 8:03 PM, Dieselfuture said:

It's OK to temporarily test it like that, not recommended to leave it without reprogramming it to your truck.

Just put in ECM and PCM and I'm still rite where I was. No bus on my cluster and CCD on my overhead. What the hell do I do next?

 

Cold be in wireing like mentioned before, may want to go through all grounds and connectors, make sure nothing there. All the ground wires in harness use some sort of glue/press/crimp connection, it's a good idea to unwrap wireing loom and redo all grounds. Could be just a lise connection some place, wireing gremlins are the worst.