2017 CXHA 150ps Cut out wont restart

Now you have a new sensor, and it's reporting 102,000kpa, that's looking correct for starting and idling pressure according to the data above. (It will go a lot higher under revs and load)
So, either something is electrically blocking the injectors from firing, or they are all full of metal particles from a knackered pump.
Was the old sensor giving implausible readings because it was blocked with debris?
 
Now you have a new sensor, and it's reporting 102,000kpa, that's looking correct for starting and idling pressure according to the data above. (It will go a lot higher under revs and load)
So, either something is electrically blocking the injectors from firing, or they are all full of metal particles from a knackered pump.
Was the old sensor giving implausible readings because it was blocked with debris?
I have vcds kit arriving this afternoon so I will get it set up and do some more investigation and upload the report, what data is it that would be beneficial for you to see what's actually happening.

The injectors must be opening as when it builds upto around 35000 kpa the injectors must be injecting fuel as it starts to fire up but the rpm only increases slightly from 230rpm cranking to 260 rpm and dies.

the old sensor was fluctuating between 0 and 200 kpa even when it wasn't attached to the rail. The new sensor does not do this.
There was no obvious signs of metal filing around the sensor or rail, also there was no sign of metal when I removed the fuel solenoid on the pump.

I have partially taken the cover of the front of the pump which contains the spring but I didn't remove it completely as I wanted to climate the rail pressure sensor first. The spring looks intact to me so I don't think that's snapped so if it is the pump I would imagine it's the dreaded metal contaminated the whole system.

I'm going to check leak off from the fuel pressure valve on the rail after work and if no signs of fuel bypassing the valve it sounds to me like I need a new hpfp, 4 injectors.

Do I need to change the rail, lpfp and all lines or can these be cleaned out.
 
Surely if the pump and injectors have gone faulty it would have brought up a EML.

Have you had any recent work done? Everything is pointing to fuel being the issue.

Strange that there was no earlier warning, have you had any other faults with the van?
 
Surely if the pump and injectors have gone faulty it would have brought up a EML.

Have you had any recent work done? Everything is pointing to fuel being the issue.

Strange that there was no earlier warning, have you had any other faults with the van?
New years eve I was hour away from home drove to a Chinese restaurant perfectly.
Come out of the restaurant and van wouldn't start, I called a mechanic friend and he said check the fuses for any blown maybe the tank pump had blown a fuse.
I removed every fuse from under the dash one by one but found none had blown but it must have reset something and it started up instantly, when I got back home I did a full scan and there was the usual low voltage and non communication error messages when the battery runs low. I cleared these and have done maybe a couple of thousand miles since with no issues until now.

3 years ago the timing belt snapped we put down to the mechanic fitting a cheaper alternative to oem/gates.

It had new camshaft as they couldnt guarantee hadnt spun a lobe i think there was 8 valve changed and rocker arms etc etc was over 3.5k in parts from tps but no damage to the pistons or anything, had full top end rebuild and I've done maybe 40 k on the van since without issues.
 
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I've checked today if there was any fuel returning on the pipe that comes from the injector leak off and the rail control valve.
This was after cranking it over twice for 10 seconds there was no fuel out of the pipe until after the pressure built and the van injected it coughed and stopped then fuel come out.

IMG-20250122-WA0015.jpeg
 
Could the issue be linked to the non start at new year? Could it be a electrical fault?

Has your VCDS turned up?

Everything is pointing to the HPFP.

Stupid question, have you got plenty of fuel?
 
is there a how to on here for what you will need from me.

Please post the following:

1) VCDS Auto-Scan​

Plug in VCDS dongle.​
Start VCDS on computer.​
IGNition ON​
On VCDS click Auto-Scan​
1737568810468.png
(Below)​
Click Start - let VCDS use Auto-detect and settings as below ... it takes a few minutes to scan all the modules​
1737568826826.png
When finished, under Results click Save - to create a file Log-WV1ZZZ7Hxxxx.txt file in folder C:\Ross-Tech\VCDS\Logs\
Also Copy can be used to copy and paste e.g. here, or into Notepad​
Post/attach the Auto-Scan file.​




2) VCDS engine blockmap data​

IGNition on (engine not running)​
VCDS > Applications > Controller Channel Map >
1737571213864.png
Tick/fill boxes as above and click Go.
VCDS flashes screens for about 70 seconds (when finished hit "Done, Go Back") and there will be file blockmap-01-...csv in folder C:\Ross-Tech\VCDS\Logs\....
Please post/attach the blockmap file.​


3) VCDS log when cranking the engine​

Ignition ON​
VCDS > Select > Engine > Adv. Meas. Values >
Tick the following items​
IDE00021 Engine RPM [1/min]​
IDE00347 Air mass: actual value: [g/s]​
IDE00352 Main injection: duration of activation [µs]​
IDE00406 Camshaft RPM [1/min]​
IDE00407 Rail pressure regulation: status​
IDE00589 Fuel pressure [kPa]​
IDE05632 Fuel pressure regulator valve actual value [mA]​
IDE07744 Particle filter: air pressure sensor 1 bank 1: raw value [mbar]​
IDE07757 Exhaust recirc.valve 1 bank 1: posit.feedback - Actual value [%]​
IDE07822 Fuel pressure regulator valve: activation [%]​
IDE07819 Fuel high pressure sensor: unconditioned voltage [V]​
IDE07824 Tank-internal presupply pump 1 bank 1: activation [%]​


IMPORTANT:
Tick Group UDS requests by 7 (or 8, whichever value keeps data alive)​

1737232070544.png

Click Log - Start !!!
Crank the engine - 5 seconds is enough​
Stop logging etc.​
The logfile LOG-01-IDE00021.....csv will be in folder C:\Ross-Tech\VCDS\Logs
Please post/attach the logfile.​
 
I have just set up the vcds software and thanks for your instructions @mmi

something has changed since earlier testing I can no longer generate the fuel pressure i was so i suspect its the high pressure pump like suggested..:sick::cry:
 

Attachments

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Could the issue be linked to the non start at new year? Could it be a electrical fault?

Has your VCDS turned up?

Everything is pointing to the HPFP.

Stupid question, have you got plenty of fuel?
I agree i think the hpfp, now where do i start i haven't found any sign of metal contamination.

I've had a quote for a reconditioned pump from pf jones in Manchester, £470 plus a deposit of £370 that's refunded when I return my pump.

I was thinking drain the tank,
Drop the fuel tank remove the lpfp and thoroughly clean and change the lpfp if needed.
Change fuel filter
Flush the low pressure fuel lines and blow out with compressed air
change hpfp pump
new timing belt kit
new battery after all the cranking
flush high pressure side pipes

I was thinking if then an inline filter that's satisfactory to catch the metal contaminants was fitted to the injector leak off/fuel rail regulating valve return pipe that joins into the low pressure side would remove anything that the injectors may be holding.
This way i could leave the current injectors in place and hopefully there unaffected.

If i have issues with the injectors i can change them or am i asking for trouble.

sorry for all the questions this is all new to me.
 
Thanks for the logs.

No fuel pressure in fuel rail. However, interestingly after 12 seconds of cranking the pressure starts rising slowly and reaches 12300 kPa which is enough to fire injectors.

Normally at startup the pressure reaches 30000 kPa (300 bar) in less than 0.5 seconds from cranking start.

My guess is that injectors actually do fire (at 17 seconds) which bleeds the fuel rail (loss of pressure) because the fuel pump actually can't produce enough fuel to run the engine.

1737582622820.png

(below)
Actually the injectors do fire only for a fraction of a second (green) and are turned off somewhere at 17.67-17.83 seconds because of the pressure drop and thus engine dies.

1737582775298.png
(permanent no change in reported injection duration (here 4437 us) on this engine means injection duration=0)




the fuel pressure sensor with the sensor removed its fluctuating between 0 and 200 kPa
Sounds normal - as the sensor is actually measuring voltage in millivolt range, it's just jumping at it's low end sensitivity threshold. In the log "Fuel high pressure sensor: unconditioned voltage"

Is it normal for the rail pressure to go back to zero after i stop cranking?
Yes, normal.



I have partially taken the cover of the front of the pump which contains the spring but I didn't remove it completely as I wanted to climate the rail pressure sensor first. The spring looks intact to me so I don't think that's snapped so if it is the pump I would imagine it's the dreaded metal contaminated the whole system.
i haven't found any sign of metal contamination.
Still just the spring snapped???
 
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Thanks for the logs.

No fuel pressure in fuel rail. However, interestingly after 12 seconds of cranking the pressure starts rising slowly and reaches 12300 kPa which is enough to fire injectors.

Normally at startup the pressure reaches 30000 kPa (300 bar) in less than 0.5 seconds from cranking start.

My guess is that injectors actually do fire (at 17 seconds) which bleeds the fuel rail (loss of pressure) because the fuel pump actually can't produce enough fuel to run the engine.

View attachment 271822


Actually the injectors do fire only for a fraction of a second (green) and are turned off because of pressure drop (thus no change (=0) in reported injection duration after 17.67 seconds (below) and thus engine dies.

View attachment 271823






Sounds normal - as the sensor is actually measuring voltage in millivolt rang, it's just jumping at it's low end sensitivity. In the log "Fuel high pressure sensor: unconditioned voltage"


Yes, normal.





Still just the spring snapped???
Thank you for your reply and checking this over for me.
I will remove the spring tonight after work and inspect. Hopefully it's just the spring.
 
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Yes, agreed with the data - it seems the pump simply isn't capable of getting up to pressure, and as soon as the injectors fire, the pressure drops.
Hopefully it's just a broken pump, and no metal debris! I would totally dismantle the pump and inspect for any worn surfaces that could have created metal particles.
If it is a broken spring, I don't know if there is an underlying cause for this, whether the pump still needs to be fully stripped to inspect, and if it's DIY repairable. Others on here may have had experience with this repair?
 
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Yes, agreed with the data - it seems the pump simply isn't capable of getting up to pressure, and as soon as the injectors fire, the pressure drops.
Hopefully it's just a broken pump, and no metal debris! I would totally dismantle the pump and inspect for any worn surfaces that could have created metal particles.
If it is a broken spring, I don't know if there is an underlying cause for this, whether the pump still needs to be fully stripped to inspect, and if it's DIY repairable. Others on here may have had experience with this repair?
I will do as you suggest and dismantle the pump i will upload some pictures for you all to see.
 
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