Hi all,I got a 2015 Land Rover Range Rover 5.0 Supercharged from auction with a fuel pressure issue.
The car has cylinder 5-8 misfire(both banks!) and fuel rail pressure too low errors.
Carfax shows the injection fuel pump was recently replaced (likely HPFP).
Using SDD, I get:
Low-pressure sensor: 2.5V (normal)
Fuel rail pressure sensor: 0V (abnormal)
I replaced the rail pressure sensor and checked the wiring. Pin 5 on the sensor receives 5V. Pin 3 (ground)seems to be good. Was even trying to ground it straight to body.
When check Voltage on pin 4(pressure output) it shows 0.5v when engine off ignition on. When start engine it goes up to 1.5-1.7 in voltmeter, but sdd sometimes shows 0, 0.5, 1.7V. Very inconsistent.
ECU seems to be replaced, found in the trunk the old one.
Anyone seen this before? Could something like the fuel pump driver module or a grounding issue be frying ECUs?

Real world problems.

I'm currently replacing a couple of upstream fuel pumps to try to get to the bottom of a non-starting SDV8 diesel.

They do suffer from grounding issues when the batteries are a long way from the engine. Most of the earth points are under the front wheel arches and are worth checking.

I've noticed a definite difference in current flow with a jump pack connected to the charging points under the bonnet, so that might be worth looking in to.