Thread: New Hilux Fuel Consumption

Originally Posted by longrange308

Rite the s in scv is for suction, it is pre high pump pressure, works totally opposite to the way you are thinking
Your data logger may not be fast enough operating speed to see the whole picture
And 13 is two full years before the mk1 face lift let alone mk2 but sweet as

Dragging this back up from the dead - replaced the fuel pressure modulation valve (what is commonly called the SCV) and yep that's the cause of the fault. Bosch uses the SCV to control pressure delivered by the injection pump to the rail - that's why in their lingo it's called a fuel pressure modulation valve and not a suction control valve. It took a look at the Bosch schematic of the system for me to understand the difference there, between the injection pump and the common rail the only item that exists is the 'SCV' valve which on the schematic is labelled the 'Fuel Pressure Modulation Valve' so this is the only thing that can control fuel rail pressure. Very definitely the cause of the fault, not only did it fix the limp mode issues I was having it also fixed a few other issues like running on after key off and occasional hard starting. I've got the old valve sitting there, at some stage I'll open it up for a post mortem and see what's died in it.

This ute is definitely PXII on the data plate - it has the 3500Kg tow rating (PXI were all 3250Kg as I understand it and Ford needed to change model classification to change the towbar rating - 3500Kg was a requirement for this vehicle for me purchasing it and the earlier version didn't have this). I hear what you are saying re the facelift, the facelift PXII's were 2014 model year onwards. There was about three minor changes between PXI and PXIII that didn't get a change in designation, a couple of internal freshen ups and the facelift.

Re: the datalogger, this thing is settable for it's sampling rate down to something like 20 or 30 times a second - problem is you can't store the data it generates at that sampling rate. The good thing with the fault I had is that it was very slow in terms of drop of pressure in the common rail in that the fuel modulation valve wasn't opening when the ECU demanded it which meant the "Fuel Rail Pressure Demanded" line from the ECU dropped to something like 1000Bar but the "Fuel Rail Pressure Actual" stayed much higher up near 2000Bar before slowly dropping back. "Fuel Rail Pressure Sensor Volts" (the actual raw readout in volts from the common rail pressure sensor) reflected the fuel rail pressure actual as it should have - the one thing I couldn't get was the duty cycle for the modulation valve and that's me not being able to find the code for the readout from the ECU not because the gear couldn't pull it off. This setup is able to do everything if not more than Ford's gear including coding replacement injectors and other offsets as well as the usual reading resetting or acknowledging DTC's - but I can tell you my confidence is far more of a limiting factor haha. No intention of bricking my vehicle through ignorance thats for sure!

My manual 2021 flat deck double cab diesel Hilux has just done 37020 Kms & is sitting on 8.4 litres per 100 kms for its entire life with an average speed of only 39 kph

I use 4wd when ever on a gravel road which is often

I haven't seen an auto one come even close to that economy for its life & average speed, not surprising given how much the converter slips ,

Mine is happy enough at 54kph in 5 gear, 65 in 6th

I am extremely reluctant to get an auto Hilux

My new Toyota started off around 11.5L/100km, then I put some heavy mud tyres on it, and it went to 12.5L/100km, which is about what I expected. 6000km later, it heading back towards 12L/100km, mix of loaded and towing, off-road loaded and regular unladen road driving. It doesn’t have a fuel consumption computer, so I keep a log of usage every time I fill up.


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Originally Posted by Kiwi Greg

My manual 2021 flat deck double cab diesel Hilux has just done 37020 Kms & is sitting on 8.4 litres per 100 kms for its entire life with an average speed of only 39 kph

I use 4wd when ever on a gravel road which is often

I haven't seen an auto one come even close to that economy for its life & average speed, not surprising given how much the converter slips ,

Mine is happy enough at 54kph in 5 gear, 65 in 6th

I am extremely reluctant to get an auto Hilux

Mines an auto, if I didn’t do the km towing and gravel roads that I do then I might get close to those results?

I’m not sure what decent tires will do to those consumption figures though.

I wasn’t sold on the auto transmission but now I can't see myself going back to a manual one.

Originally Posted by Kiwi Greg

My manual 2021 flat deck double cab diesel Hilux has just done 37020 Kms & is sitting on 8.4 litres per 100 kms for its entire life with an average speed of only 39 kph

I use 4wd when ever on a gravel road which is often

I haven't seen an auto one come even close to that economy for its life & average speed, not surprising given how much the converter slips ,

Mine is happy enough at 54kph in 5 gear, 65 in 6th

I am extremely reluctant to get an auto Hilux

That is my experience with the manual 3.2L Ranger too, currently sitting between 8.4 and 8.5L/100Km whereas the auto's in similar useage are 10-11L/100 or more. Mine is lifted about 20mm on the front and about 50mm at the back with a 7-leaf high load spring pack and has a canopy so at factory height with no canopy I'd be expecting in the high 7's. Note the figures from when the high lift springs went in the back and before I lifted the front to balance and drag the front end back into the factory range were high 6's and low 7L/100Km! Just a bloody shame the ute wasn't driveable and behaved like a widowmaker...

Done 40k in my hilux now. I’ll never be going back to a Manual. Less the extra fuel consumption it’s just so much nicer to use in every way. Open road with no towing I get about 10.3 per 100 but mix in town and what not it’s about 10.5. That’s setup with the lift, bull bars, winch, bigger tyres etc etc. Loving it, great truck.

keep a good eye on tyre pressures.