Need fuel pump run pin in PCM

[Off Road SHO]

Would anybody happen to have a wiring diagram for a 93 ATX and could tell me which pin (or wire colors) sends the "run fuel pump" command to the CCRM? I'm going to bypass the fuel pump relays in my CCRM and use my own relay. Thanks in advance.

Tom

 

[projectSHO89]

You can download your own diagrams from the Russian site listed in the sticky in the Electrical forum.

Steve

 

[Off Road SHO]

I already have the diagrams, Steve. They are not making sense to me in regards to the fuel pump and the cooling fans. I was hoping someone had another set I could compare against. Thanks though.

Tom

 

[projectSHO89]

Reference diagram 9311.pdf, Figure 27 from the Russian site.

The FP relay in the CCRM is driven by an active low (ground) from PCM pin 15, TAN/LT GRN. This wire goes to the DLC (Data Link Connector), then to the CCRM on pin 18(?). This is the same pin on the DLC that is grounded when testing the fuel pump and fuel pressure.

What is it about the dual-speed fan circuit that you have a question about?

Steve

 

[Off Road SHO]

Steve, Thanks for the reply. I'm wiring up "The Other Woman" according to the Ford wiring diagram that I have on a CD. I'm using the computer, CCRM and fuse block out of a 93 ATX.

According to my diagram, pin 15 of the PCM goes to the fuel injector #5. On my diagram pin 22 of the PCM is a tan/LG that goes to the Datalink connector and then to pin 18 of the CCRM and it's labeled LFP Ground. Do you think that the PCM grounds the relay that supplies the current to the fuel pump?

Also, I'm using aftermarket fans that I want to run at a single speed and my diagram show the fans turned on by one circuit coming out of two pins ( 3&4) of the CCRM. It looks like pins 13 and 31 are the LFC and HFC on the PCM and connected to LFC ground and HFC ground on the CCRM. Do you think that the "signal" sent by the PCM is again actually a ground of the relay in the CCRM?

Thanks

Tom

 

[projectSHO89]

Yes, the relays are all turned on by grounding the low side of the coil via a signal from the PCM.

Unfortunately, my 93-94 Shop CD is hosed so I cannot consult the EVTM. I have two other sources of diagrams, but they are not consistent with each other..... If I gave any advice based on these diagrams, I would not be at all comfortable that the information was accurate.

Sorry...

Steve

 

[Off Road SHO]

Thanks any way Steve, with what I got from you yesterday, I can do some verificatin and figure it out. Thanks again.

Tom