Lincoln ls.

[djusc122]

Any ls techs out there.

[greasybob]

No, but a wiring diagram, a scanner, a scope and big hammer and I can fix most anything. Whats the question ?

[djusc122]

04 lincoln ls 3.0 spins no start. Have a p1235. Replaced rem. Fuel pump works. Can jump pump and car runs. Wiring seems to check out ok. Any thoughts.

[Witsend]

Check ETC for a code 2105, that code needs to be fixed first .
As far as back to basics circuit check at the fuel pump relay connector
For the primary side of circuit of fuel pump relay at rear of car, the blk/blu wire should have continuity to ground (G300) at right C-pillar.
The Grn /Blu wire should get power through the fuel pump diode and be hot in start(crank) and run (maybe just initially on KOEO).
The secondary side of the relay, Red /blu wire should be hot at all times with power supply from fuse 17 .
Grn/red wire should have continuity to pin 1 of REM
Good Luck

[djusc122]

Sorry. No 2105. Tb looks new. Not changed by me. I have power at the fp but am not getting enough ground. Can jump ground and car runs.

[Witsend]

I would verify that all the ground paths of the RCM in the ground distribution diagram have a good path to ground, because the RCM has to internally provides a ground path that leads to at leat one of the ground wires and be able handle the amperage load of the fuel pump.

[djusc122]

ok. how about I can activate it with a scan tool and run the car. and when activating it and measuring resistance it changes with pwm percentages. but I have seen powers and grounds do some weird stuff. ill check those.

[greasybob]

Do you have an amp probe ? How many amps does the pump pull when activated ? No other PCM Codes ? Code definition below. The way I read it the PCM and Rear Electronics Module communicate over the SCP+ and SCP- lines. And causes include fuel pump circuit shorted or open, ETC System concern, damaged FPDM or REM in this case or damaged PCM.

[djusc122]

No other codes. Not sure about the amps. Kinda leaning towards a pcm.