Member Since: 26 Nov 2008
Location: on the east side
Posts: 555
Fuel pressure feature.
Please advise on availability of the feature to check fuel pump pressure on 4.4 V8 petrol engine.
I tried to locate it on the IDD tool device under body control and engine but could not locate it.
23rd Dec 2024 10:53 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Gulf of MEXICO
Posts: 5388
If it's available it will be in the ECM only, however as it's a petrol (low pressure injection) and not diesel it may not even be monitored! When you select "live values" make sure to select the complete list and see it it's there. Operating pressure is 4.5bar and there is a schrader test port on the LH fuel rail.
If not you'll have to use a pressure test gauge/kit. yµ (idµ - eAµ) ψ=mψ
24th Dec 2024 2:33 am
thorgal
Member Since: 26 Nov 2008
Location: on the east side
Posts: 555
Thank you very much,
I know that operating pressure is around 65 psi from the LR manual. I also suspected that 05 model year and only '05 has schrader valve to check the pressure outcome, just was not sure it there is some way to receive direct information through IIDD Tool. I remember selecting full list in petrol engine ECU live values section, there is a table with barometric pressure but not if is referring to fuel pressure in the system while pump is working.
25th Dec 2024 3:25 pm
thorgal
Member Since: 26 Nov 2008
Location: on the east side
Posts: 555
My codes are mostly coming from body control module, I don’t really whow what they mean, electrical issue, clock spring failing or broken wire somewhere, some say start with fuel delivery system, I don’t know..
Click image to enlarge
Click image to enlarge
Click image to enlarge
25th Dec 2024 3:29 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Gulf of MEXICO
Posts: 5388
No the barometric value is only there so the PCM knows if the engine is operating down at sea level or on top of a mountain. (Differing oxygen levels)
If you suspect the pump is faulty a fuel filter change can sometimes help, but tbh at this point in the cars life both should be replaced with quality items.
B1C57 ??
Dodgy relay probably in the BJB! Try swapping over relays that are exactly like for like!yµ (idµ - eAµ) ψ=mψ
25th Dec 2024 3:36 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10969
I think the relay code is quite common and a non issue.
Don't think its used.
In any case, its a built in relay which cant be changed
25th Dec 2024 5:23 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Gulf of MEXICO
Posts: 5388
Is B1C57 referring to a FET Pete?
If it is then as you say it's non serviceable and is probably on the BCM. He doesn't seem to have any PCM codes!yµ (idµ - eAµ) ψ=mψ
25th Dec 2024 6:35 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10969
No. It’s talking about a relay which is soldered into to bcm cjb. There are Lots of them.
26th Dec 2024 7:55 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10969
IF you can’t talk to a lot of ecus then maybe some pins aren’t making contact in the diagnostic socket.
Eg high speed can pins
26th Dec 2024 7:58 am
thorgal
Member Since: 26 Nov 2008
Location: on the east side
Posts: 555
When I clear all codes, seat recliner and seat motor come back at idle, but others when I press on accelerator at 1500 rpms after few seconds.
26th Dec 2024 4:47 pm
thorgal
Member Since: 26 Nov 2008
Location: on the east side
Posts: 555
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