2006, XC90 2.5T no start , fuel delivery?

[betoarmenia]

Thank you very much Wanderdüne, I will left a photo bellow with all the codes before erasing them. After wiping all of them, only the one about the fuel pump relay remains.

Additionally the VIN just in case it can help. Unfortunately I do not have access to Vida. Your help is highly appreciated

In case I found a CEM in a wrecker, would it work plug and play? I believe it would need special programming from the dealer and it would be more expensive than the car.

[xHeart]

Additionally the VIN just in case it can help. Unfortunately I do not have access to Vida. Your help is highly appreciated

Mike Lucas may help https://www.precisioncarmodules.com

[cn90]

Search to see if you can buy the fuel relay and solder it yourself.

[ggleavitt]

I was incorrect, code is being produced by a post-05 CEM on a no-DECOS vehicle.

See extract from VIDA for this error. Note verbiage about internal relays, I believe they're components now so might not be easy to replace. And special attention to the Note!:
Diagnostic trouble code (DTC) information CEM-3F91
Condition
Central electronic module (CEM) checks the fuel pump relay, and activates it, when an approved check has been made by the system for Immobilizer. The fuel pump relay is located internally in the Central electronic module (CEM). The fuel pump relay sends voltage feed to the fuel pump when the relay is activated.
If Central electronic module (CEM) detects that the output to the fuel pump is short-circuited to voltage, the diagnostic trouble code is generated.
The diagnostic trouble code (DTC) can be diagnosed in ignition position II and if the fuel pump relay is activated at the same time.

Note! Applies to vehicles to and incl. model year 2006- When troubleshooting, the fuel pump may not be supplied with voltage by an external power source without first disconnecting the connector to the Central electronic module (CEM). If the connector is not loosened and the fuel pump is supplied with voltage, this can lead to failure of an internal ground conductor in the Central electronic module (CEM).

Note: Applies to vehicles from and incl. model year 2007- The case with the ground cable described above does not apply to Central electronic module (CEM) from and incl. model year 2006. This diagnostic trouble code can be generated if the cable for voltage feed to the fuel pump has an open circuit or if the fuel pump is not connected.

Note: The following applies to vehicles with fuel pump module (PEM):
Central electronic module (CEM) checks the voltage feed to the fuel pump module. The Central electronic module (CEM) activates the voltage supply to the fuel pump control module after the checks carried out by the function for the immobilizer have been approved. The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that the voltage in the signal cable is too high.

If you need to replace your CEM, it might be good to contact forum member Yagger and see what options you have to get it coded where you are.

10/27/20- Revise post to reflect different information with a different response. 10/28/20- Add some bold for clarity and ease of reading (reported vehicle is a MY06), add Yagger for contact.

[abscate]

Edited title to conform to a Forum rules

[kallekula]

Additionally the VIN just in case it can help. Unfortunately I do not have access to Vida. Your help is highly appreciated

Mike Lucas may help https://www.precisioncarmodules.com

Is that precopster Mike?

[xHeart]

Additionally the VIN just in case it can help. Unfortunately I do not have access to Vida. Your help is highly appreciated

Mike Lucas may help https://www.precisioncarmodules.com

Is that precopster Mike?

Yes!

[cn90]

I wonder what people like Xemodex or Yagger does for the CEM.
My guess is something simple bc they can turn around in one day.
Maybe reheat in the oven at ___ temp and ___ minutes to resolder the joints.
Maybe replace 1-2 relays etc.

Wonder if this kind of job (rebuilding CEM) can be done at home.

[betoarmenia]

Hi everyone, got updates. First of all, thanks everyone for taking your time trying to help me. I was decided to remove the CEM and found a place called Injectronix in Melbourne that may be able to fix it (just in case someone needs it in the future).

Luckily, before removing the computer, I connected a 12v battery direct to the fuel pump and guess what?? No sound... Then, hit the fuel pump with a hummer and the pump started working. I purchased a new fuel pump and replaced yesterday. Today drove the car about 150kms and no problems at all. The only new issue is a sign in the dash “Srs Airbag service urgent”. Maybe I disconnected something when removing the rear seats.

Well, I hope the car keeps working and thanks again for your help.

[betoarmenia]

Ohh almost forgot, the tool for removing fuel pump is very hard to find in the shops, so I manufactured one using a 4” PVC connection. Attached some photos as it could help someone stuck.