Help with engine cutting out randomly

[Matias]

Charlie,
common is damaged wiring before engine fan in cables plastic round cover.

Sent from my LLD-L31 via Tapatalk

[charlie_]

I'm gonna rip the loom out today and see where is damaged. If I can il repair the loom but should it come to it where would be the best place to get a loom? Cant seem to find any on ebay etc for my Caddy.

Thanks for your help

[Doc]

You don't want to go replacing the entire loom if it's just a small bit of damage in one area. The body loom is one piece from front to back.

[charlie_]

Yeah I understand.

In the process of taking out both of the engine looms now. Was going to look for just damaged areas, but upon taking it out I have seen lots of heat shrink so want to look over the whole loom properly now and fix where
needed.

I’m hoping it is the engine looms to fault as every time the van has cut out it has been giving dtcs for different sensors on the engine each time.

[charlie_]

Still got no luck. The van is better than before but still cutting out. I’ve replaced glow plug relay (100) as well as two relays labeled 460 under the dash, one of which I read feeds the ECU somehow.

I noticed yesterday that when the van was running the asr button in-front of the gear stick was illuminated to say asr was off. Also whenever the van cuts out I’m pretty certain it’s the asr light that illuminates on the dash. (Picture below of dash right after the van has cut out)

I understand that asr is anti slip regulation so could it potentially something to do with my brakes? The only thing that makes me think it’s not is that the only dtc that is on the brakes/asr once the van has cut out is error 0522 (engine control module).

The ecm has 3 dtcs, 2185(coolant temp I know about), 0691 (cooling fan I know about) and 0401 exhaust gas recirc flow insufficient detected.
Note: when the van cuts out it is not possible to communicate with the ecm and simply times out in VCP. You are only be able to start communicating with it again once the asr light has gone.

Also I have noticed occasionally the van will judder as If it’s going to stall. Sometimes when it does this the glow plug light flashes as well.

Any help would be appreciated. I know it’s a really hard thing to help diagnose but wondering if anyone has any more ideas of things to try as I am running out of them.

Thanks

[Doc]

From your description, I think you might have a ABS fault.
I've seen it before where the ABS fails and blocks CAN communication on the drivetrain network, blocking ECU, TCU and instrument cluster along with ABS. Next time it cuts out and you can't communicate with the ECU, try the others just to prove.
1K0-907-379P ABS modules are quite cheap on eBay, that's the one I've seen fail and I'd assume yours will be that too.

[charlie_]

Okay. That sounds interesting.

when you say try the others just to prove, do you mean try to talk to abs, asr etc over can once the van has cut out?

Cheers.

[Doc]

Yea, try to connect to the other modules on the drivetrain CANbus.

[charlie_]

Got you.

Il get on with that tomorrow. If I can’t communicate with any other modules then il have to go about getting a new abs module.

Is there any sort of test I could do to check the abs pump? I understand it’s an intermittent fault however, so there may not be a way to.

Cheers

[Doc]

Pull the ABS fuses if it does it, if the problem goes away then you know it's that.
You might need to unplug it if it's faulting while power is off due to moisture.

[charlie_]

Understood. Will have a mess about tomorrow.

Thanks for the suggestions!

[charlie_]

Right; van has cut out, asr light has illuminated on dash but I can still talk to the abs module over can when the van is in this state.

Another thing I noticed is whenever the engine cuts out you can audibly hear a relay turn off from under the steering wheel. As I said I’ve replaced two 460 relays under there.

In regards to the relays, when you initially put the keys in the van and turn it to accessory, it the van is going to start you can hear 3-4 relay clicks. However if it isn’t going to start and is going to display the asr light, you only ever hear one relay click.

Could it be an issue with a relay somewhere I don’t know about?

Also my ASR switch seems to have started to work? Never used to be able to turn it off, but now I can.
Note: turning the asr off manually via switch whilst the van is running does not cause it to cut out.

Thanks again.

[stevennicholas]

Hi Ive got a van with same fault have u managed to fix your yet thanks

[Dr03rss]

Was this ever fixed?

[charlie_]

Hi, apologies for not replying to thread had forgot password to account so never replied until I saw your message in my emails.

In the end it was the fuse/relay module to the right of the battery. Remove it with one fixing in the middle (think it’s T30) and till lift straight off it’s connector that is on the bottom.

My suspicion was that as it’s directly above the ns wheel that overtime water has ingresses and corroded the contact on the ECM power relay and caused intermittent issues.

You can grab them for £10 ish on eBay. Just put in the long part no from the back of yours. You may struggle to find one with the exact same part no as yours but as long as it’s got the same fuses & same relays in the same place then you should be fine. Mine didn’t match no’s and was missing a relay that my only one had but worked completely fine.

Any questions ask and il reply now apologies again

Cheers. Charlie.