XM V6 Sei finally going for restoration

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xantia_v6
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Re: XM V6 Sei finally going for restoration

Post by xantia_v6 » Mon Aug 08, 2022 7:16 pm

You can use LEDs with resistors (often called Noid lights) across the injector to see if they are being triggered.

Is the immobiliser disarmed?
1999 XM Exclusive V6 24V ES9 Manual (LHD) 105,000 km
1997 Xantia Exclusive V6 (RHD) 45,000 miles

dcz1643
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Re: XM V6 Sei finally going for restoration

Post by dcz1643 » Mon Aug 08, 2022 7:36 pm

xantia_v6 wrote:
Mon Aug 08, 2022 7:16 pm
You can use LEDs with resistors (often called Noid lights) across the injector to see if they are being triggered.

Is the immobiliser disarmed?
Hi, we believe the immobiliser is disarming, everything seems to be right when the code is punched in. Thanks for the tip of putting an led (with protective resistor across the injector, to see if they are being triggered. We will give that a go. Cheers…Derek
Derek
1990 Citroen XM V6 SEi (SORN)
1997 Ford Explorer V6
2011 Jaguar XF Diesel Sport
1974 Triumph Spitfire 1300

xantia_v6
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Re: XM V6 Sei finally going for restoration

Post by xantia_v6 » Mon Aug 08, 2022 7:56 pm

I don't know if you have seen and deciphered the diagrams attached to viewtopic.php?f=8&t=10268&p=122537&hili ... 9e#p122537

I think there were some other Fenix3 diagrams posted on this site, but I cna't immediately find them.
1999 XM Exclusive V6 24V ES9 Manual (LHD) 105,000 km
1997 Xantia Exclusive V6 (RHD) 45,000 miles

dcz1643
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Re: XM V6 Sei finally going for restoration

Post by dcz1643 » Mon Aug 08, 2022 8:20 pm

xantia_v6 wrote:
Mon Aug 08, 2022 7:56 pm
I don't know if you have seen and deciphered the diagrams attached to viewtopic.php?f=8&t=10268&p=122537&hili ... 9e#p122537

I think there were some other Fenix3 diagrams posted on this site, but I cna't immediately find them.
Thank you for this, very helpful. Peter has just told me one of the rubber seals on one of the injection rails is split. You wouldn’t know where to source them from would you? Cheers…Derek
Derek
1990 Citroen XM V6 SEi (SORN)
1997 Ford Explorer V6
2011 Jaguar XF Diesel Sport
1974 Triumph Spitfire 1300

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Re: XM V6 Sei finally going for restoration

Post by citroenxm » Mon Aug 08, 2022 8:40 pm

I've got a 12v injector rails with 3x injectors in it spare
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Re: XM V6 Sei finally going for restoration

Post by dcz1643 » Mon Aug 08, 2022 8:47 pm

citroenxm wrote:
Mon Aug 08, 2022 8:40 pm
I've got a 12v injector rails with 3x injectors in it spare
Thanks for this, I may get back to you for a price. If we can’t get new injector seals, that maybe the only way to go. Cheers…Derek
Derek
1990 Citroen XM V6 SEi (SORN)
1997 Ford Explorer V6
2011 Jaguar XF Diesel Sport
1974 Triumph Spitfire 1300

Dieselman
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Re: XM V6 Sei finally going for restoration

Post by Dieselman » Tue Aug 09, 2022 6:35 am

Fenix-3 diagram is in the linked topic. I believe you have already had this.

viewtopic.php?f=8&t=10268

The injector seals are just o rings and are commonly available, yours should be Seimens Dekra 2892 injectors.

The power for the injectors is fed via relay 807, which feeds power to the Ecu and ignition amplifier, so must be working.
The injectors are fed via a single =12v power feed and returned to the Ecu in two Gnd feeds.

Use a +12v test lamp to check for power feed and to see if the returns are shunting to Gnd.
The injectors should have resistance of ~16 Ohms, hot, or cold, thus a test lamp upto 9w would be sufficeint to test the injector voltage.

You could perform a physical check on the injectors by pressurising them with fuel (3 Bar), then if they have +12v, shunt the return side to Gnd and watch the injector spray.
This Ecu doesn't emply sequential injection, it fires them in each bank, so a quick shunt to Gnd of the return wires should make ht eengine run, if not properly.

Check all power feeds and Gnds for the Ecu and actual fuel pressure at the rail.

I would be surprised if the Ecu jhas failed just for injector trigger, they are pretty reliable, I suspect the power feed wire is the issue.

If there is a reliable, timed, spark, then the crank sensor must be functioning, if not suspect the sensor has failed. It should have 300 ohms resistance.
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Re: XM V6 Sei finally going for restoration

Post by dcz1643 » Tue Aug 09, 2022 7:17 am

Dieselman wrote:
Tue Aug 09, 2022 6:35 am
Fenix-3 diagram is in the linked topic. I believe you have already had this.

viewtopic.php?f=8&t=10268

The injector seals are just o rings and are commonly available, yours should be Seimens Dekra 2892 injectors.

The power for the injectors is fed via relay 807, which feeds power to the Ecu and ignition amplifier, so must be working.
The injectors are fed via a single =12v power feed and returned to the Ecu in two Gnd feeds.

Use a +12v test lamp to check for power feed and to see if the returns are shunting to Gnd.
The injectors should have resistance of ~16 Ohms, hot, or cold, thus a test lamp upto 9w would be sufficeint to test the injector voltage.

You could perform a physical check on the injectors by pressurising them with fuel (3 Bar), then if they have +12v, shunt the return side to Gnd and watch the injector spray.
This Ecu doesn't emply sequential injection, it fires them in each bank, so a quick shunt to Gnd of the return wires should make ht eengine run, if not properly.

Check all power feeds and Gnds for the Ecu and actual fuel pressure at the rail.

I would be surprised if the Ecu jhas failed just for injector trigger, they are pretty reliable, I suspect the power feed wire is the issue.

If there is a reliable, timed, spark, then the crank sensor must be functioning, if not suspect the sensor has failed. It should have 300 ohms resistance.
Thank you for such a comprehensive and informed response, I am sure this will be of enormous help. There is always a chance that an earth has gone bad but I did replace those strange earth blocks/fittings many years ago, with direct earth bolts and eyes. The other thing is there was an old mouse nest under the bonnet when the XM was pulled out, so I hope the buggers haven’t been chewing the wiring? Thanks again, I will report back when the big lump bursts back into life…Derek
Derek
1990 Citroen XM V6 SEi (SORN)
1997 Ford Explorer V6
2011 Jaguar XF Diesel Sport
1974 Triumph Spitfire 1300

dcz1643
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Re: XM V6 Sei finally going for restoration

Post by dcz1643 » Tue Aug 09, 2022 7:37 am

dcz1643 wrote:
Tue Aug 09, 2022 7:17 am
Dieselman wrote:
Tue Aug 09, 2022 6:35 am
Fenix-3 diagram is in the linked topic. I believe you have already had this.

viewtopic.php?f=8&t=10268

The injector seals are just o rings and are commonly available, yours should be Seimens Dekra 2892 injectors.

The power for the injectors is fed via relay 807, which feeds power to the Ecu and ignition amplifier, so must be working.
The injectors are fed via a single =12v power feed and returned to the Ecu in two Gnd feeds.

Use a +12v test lamp to check for power feed and to see if the returns are shunting to Gnd.
The injectors should have resistance of ~16 Ohms, hot, or cold, thus a test lamp upto 9w would be sufficeint to test the injector voltage.

You could perform a physical check on the injectors by pressurising them with fuel (3 Bar), then if they have +12v, shunt the return side to Gnd and watch the injector spray.
This Ecu doesn't emply sequential injection, it fires them in each bank, so a quick shunt to Gnd of the return wires should make ht eengine run, if not properly.

Check all power feeds and Gnds for the Ecu and actual fuel pressure at the rail.

I would be surprised if the Ecu jhas failed just for injector trigger, they are pretty reliable, I suspect the power feed wire is the issue.

If there is a reliable, timed, spark, then the crank sensor must be functioning, if not suspect the sensor has failed. It should have 300 ohms resistance.
Thank you for such a comprehensive and informed response, I am sure this will be of enormous help. There is always a chance that an earth has gone bad but I did replace those strange earth blocks/fittings many years ago, with direct earth bolts and eyes. The other thing is there was an old mouse nest under the bonnet when the XM was pulled out, so I hope the buggers haven’t been chewing the wiring? Thanks again, I will report back when the big lump bursts back into life…Derek
Sorry, stupid question, do you know the location of relay 807? Cheers…Derek
Derek
1990 Citroen XM V6 SEi (SORN)
1997 Ford Explorer V6
2011 Jaguar XF Diesel Sport
1974 Triumph Spitfire 1300

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Dean
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Re: XM V6 Sei finally going for restoration

Post by Dean » Tue Aug 09, 2022 4:34 pm

Hi Derek, all the required relays are in the front of the ecu box.
Injectors sticking after a layup is very common, all mine were frozen shut when I got the engine, testing the injector feeds is a good idea but it’s easier to lift the fuel rail out and lay it on a cloth to see what’s happening, just because they trigger, doesn’t mean you have fuel.

Good luck with it
D
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