L322 pulling my hair out! (Not much left)

backinblack · 2025-06-26T10:36:29+0100

Did the diags give the fuel pressures low/high?
HP regulator is a know common issue, ask me how I know.

EDIT: I don't remember seeing any fault codes.

Crankington · 2025-06-26T11:09:38+0100

Pug957 said:
If its cranking over, there's only a couple of things it can be.

It's briefly firing on cold start being sprayed it, means no fuel.

Immobiliser has been bypassed and it's cranking so not likely ews at this point.

This pretty much leaves fuel pressure sensor on the fuel filter, should kick up a code but live data will show if this is working.
Camshaft sensor, will kick up a code.
Crankshaft sensor, won't kick up a code.
Injector leak off would have to be very bad not to start, should still start but be very rough.
Theres also a pressure sensor on the fuel pump/rail somewhere but that should give a code.

Thanks for this, yeah, so the fuel pressure sensor on the fuel rail was giving a code along with the immobiliser, so I think that’s my next step, get one ordered. I’ve tested the filter and all good.

Crankington · 2025-06-26T11:11:55+0100

backinblack said:
Did the diags give the fuel pressures low/high?
HP regulator is a know common issue, ask me how I know.

EDIT: I don't remember seeing any fault codes.

i need to triple check with the mechanic, but he said that the fuel pressure sensor was throwing up a code (this was all in French and I’m still learning so didn’t get all the info)

Crankington · 2025-06-26T11:14:16+0100

kermit_rr said:
do you have any specifics? actual DTC codes?

Yes so the ECU code was : P1602… have messaged the mechanic regarding the fuel pressure code.

backinblack · 2025-06-26T11:15:22+0100

If the HP regulator has gone faulty it will cause low pressure so may show as a sensor fault.

Crankington · 2025-06-26T11:28:32+0100

backinblack said:
If the HP regulator has gone faulty it will cause low pressure so may show as a sensor fault.

This part right? https://ebay.us/m/XQ5e8w

kermit_rr · 2025-06-26T11:35:42+0100

Crankington said:
Yes so the ECU code was : P1602… have messaged the mechanic regarding the fuel pressure code.

this can be a canbus issue

Crankington · 2025-06-26T13:42:11+0100

kermit_rr said:
this can be a canbus issue

What does that mean? Nightmare?

kermit_rr · 2025-06-26T13:44:04+0100

Crankington said:
What does that mean? Nightmare?

could be a damaged/corroded connection or wire

Crankington · 2025-06-26T13:47:28+0100

kermit_rr said:
could be a damaged/corroded connection or wire

That sounds like a huge nightmare, there is so many wires in this car

kermit_rr · 2025-06-26T13:55:37+0100

Only one is relevant! Check the ECU connectors for corrosion (,i expect you already have though,)

Crankington · 2025-06-26T14:06:26+0100

kermit_rr said:
Only one is relevant! Check the ECU connectors for corrosion (,i expect you already have though,)

Yeah have been through all the plugs on the ECU and tested for ground, live etc etc … for example, I was able to confirm that I am getting pulses of electricity to the injectors

L322 pulling my hair out! (Not much left)

backinblack

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backinblack

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