Just installed a new motor (351W EFI, SD converted to MASS Air) and am working to set the timing. I wanted to take a break but before I did I thought I'd pull the codes.

I get:

11
10
96

A search for 96 shows:A different site listed it as:Any idea how I tell which one is correct for my truck and what I might need to do about it? My AIRB is new. Although there seems to be several replacements for the AIRB, I hope I have the right one.

Thanks.

 

Telling you has open circuit between FPR and PCM, check the DK GRN-Yel wire its connections the wire itself and or the relay itself is the problem.

 

I don't think the truck computers use this function and as such are not wired to monitor the fuel pump relay circuit. All it does is confirm to the computer that the fuel pump relay has energized. I'm not sure if this affects how the computer runs the engine. I think I ran my truck both with the wire connected and disconnected when I swapped to MAF and it didn't seem to make much difference. How did you do the wiring for MAF, overlay harness, or completely new?

 

Overlay. I also replaced the relays in the engine compartment fuse box. I'll put the original ones back.

 

The relay itself is probably fine. You can check to see if it is a wiring issue by checking for continuity between the relay output wire and pin 19 on the computer connector.

 

Just throwing this out there as well...I also have the TAB and TAD solenoids beside the coil plugged (https://www.ford-trucks.com/forums/1...l#post10797516) but they are still connected.

 

Pin 19 of the PCM has continuity with 2 points on each relay and every fuse in that box.

 

Did you unplug the relays and the computer when you checked for continuity? I've had continuity checks show odd results when everything was still plugged in. Do you have dual tanks? I think that code can also be set if you switch between tanks with the engine running. At any rate, I don't think this code is causing any issues with how the engine runs. Try resetting the code and check to see if it comes back. It was output as a memory code, so it wasn't an active fault when you ran the test.

 

There is definitely something wrong and it looks fuel related. the PCM isn't throwing any more codes. I have a fuel pressure gauge and when the key is on it shows 34 psi. When I try to start it the pressure drops below 28 which is the lower limit of my gauge.

 

Did you check the circuit with the relay removed and the PCM unplugged as EPNCSU2006 suggested? You should also pop inertia switch, open its circuit.

You had stated you replaced the relays did you put the originals back in? And or use a known good FPR?

Pump runs shows circuit is good between relay and pump, code suggests Dk grn- yel wire is bad from where wire tees off after relay to pump (inertia switch) and continues on to PCM (pin #8).

Pin #8 on PCM might be corroded or otherwise not making solid connection for whatever reason.

Why it needs monitor that circuit I gotta say I do not know, as stated it does not control FP in any way.

Pump continues to run once receives signal from PIP signifying motor has started is spinning/running = continue to pump fuel.
Could cut that wire down stream of the tee off to inertia switch, cut it between that tee and the PCM and the fuel pump would still run, see no reason why it wouldn't. Would need diagram of circuits inside PCM itself to know more I guess, unless someone else knows?

Sounds like the pump is on its way out or has bad connection to it (has nothing do with code 96?).
Unless computer monitors draw/amps on that circuit via pin 8, knows the pumps windings are bad? Wouldn't really need code tell a guy that, pumps dead its dead.