I have a 2003 Dakota with a gas gauge issue and I’m trying to track down the wires that go from the PCM to the sending unit then back to the PCM I would like to know if C1 is black C2 is orange and C3 is white thank you for your time

 

The fuel pump and level sender operate from a single node.

On the fuel pump module:
Pin 1: Motor Ground, 18 gauge black
Pin 2: Sender Ground, 18 gauge black with blue stripe
Pin 3: Sender Signal, 18 gauge blue with white stripe
Pin 4: Pump Motor, 16 gauge green with black stripe

Pin 2, Sender Ground, Black with Blue Stripe goes to pin 4 on Connector 1.
Pin 3, Sender Signal, Blue with White Stripe goes to pin 26 on Connector 3.

 

Sender Ground, Black with Blue Stripe goes to pin 4 on Connector 1 has continuity And the DKB/W that goes to C3 pin 26 isn’t used and all the other wiring diagrams I can find say pin 33 but I get continuity on pin 32. I took the dash cluster out to see if it was a bad connection there now I have “no bus” I’m sorry I didn’t say that it’s a 4.7L v8 4x4 with a manual transmission

 

OK, if you have a 2003 4.7 then you should have a 4 connector PCM with the 32 tooth 4.7. I was assuming it was a 5.2 with 3 connectors. I'm not going to have a book for a 4 connector PCM.

Pull the cluster back out and check those seating pins. A couple might need to be squeezed closed just a hair.

 

Thank you for the reply and your time it just gets really frustrating when your trying to figure something out and fix it but all your doing is making it worse now I have no gauges at all I’m thinking it’s PCM because everything looks good and it tight and another quick question I used a multimeter to check continuity could that fry the PCM because that’s the only thing I have really done besides unplug stuff and plug back it

 

It's possible. The PCM is fairly sensitive, and are already frail from their age. How were you checking continuities?

The fuel level sender doesn't connect to the cluster at all. As long as the cluster passes the self test, all gauge data comes over the PCI communication bus. So generally speaking there was no reason to pull the cluster if only 1 gauge failed.

All you could have done is check for ohms across the fuel sender wires to verify it was between 20 and 220 ohms. But now knowing you have a 4 connector PCM instead of a 3 connector, you'll need somebody with the 03/04 book. Mine is an 01, so it covers the 3 connector PCMs. If you have good resistance across those 2 wires to the sender (indicating sender is working), it's either a bad something in the PCM, or the stepper motor for the gas gauge needle specifically went out (it's common on GM's).

 

Negative side of battery off ran a wire so I had something to test the PCM side with unplugged C1 and C2 and did not push the wire into the connector. I have found out today that I am getting 5v out of the PCM for the bus the only thing that I did right before the “no bus” issue was unplug the gauge cluster with battery unplugged

 

I know CCD bus runs at 2.8 volts split differential. I'm not sure what PCI voltage would be off hand

 

What were you trying to test? I'm not following the method you described.

If you were checking the harness against ground, that shouldn't have hurt the PCM.

If you were checking the PCM pins against ground....It's unlikely that you cooked a mosfet or transistor driver, but still possible.

Really need somebody to chime in here with an FSM pinout for a 4 connector NGC PCM.

 

I was seein if I had a break in on of the wires. I bought it off dodge for a parts truck but it kinda turned in to the running truck after my 2000 caught fire. Rebuilt the motor had to replace the gas tank someone broke into it on the dodge lot brinlee a hole in the tank so I replaced the pump also they broke a window out so they could take the Stereo and speakers so my thought was maybe they pulled on something and it had a bad connection to the gauge cluster and that’s when I got the no bus and no gauges at all I have broke down a got a PCM