Strange goings on with auto

Currently working on the theory it's a faulty Inertia Switch. Have bypassed that and we'll see how it goes.

The M&S lights and the XYZ switch , or low battery will generaly not cause a shutdown. A totally collapsed battery would ,but you would know about that! The inertia is a good place to start I think. A overheat will cause the ECU to shutdown but again something you would notice! unless there is a faulty sensor related to it
Good luck!
Cheers Scott

Thanks. Unfortunately it's the sort of problem I only will know is fixed by the lack of faults, so will be on tenterhooks for the next few weeks. Not going too far from home, anyway.

My D2 had the same problem when towing van. New clutch packs fitted in Albany at 110K ks never solved problem. Sold D2 @ 320K ks now have D3 with auto gearbox problems.

I'm reasonably convinced that it's electrical. The only fault that logs is one from the auto box and refers to the CAN bus timeout, so the Auto ECU and engine ECU aren't talking. Other options are a poor earth, frayed cable or loom, or XYZ switch (got one off eBay on its way). The other thing that can cause the logged fault is low volts, and I replaced the battery as it was on its way out anyway.
Current thinking is that the inertia switch going dropped power to the BCU (which it's designed to do). The CAN timing fault either happened because of that, or it had happened before the other fault and I hadn't noticed. Will be interesting to see. The Inertia Switch certainly feels dodgy, as if its been overcooked at some stage, and the plug is brittle and cracked when I unhooked it from the switch. They'll both need to be replaced (or not).

If I'm right, it's frustrating that the Inertia switch doesn't log a fault, as I've been off chasing a fault that wasn't the real problem.

Yep, more than a week later and no further faults. It was a dodgy inertia switch. All I've done is bypassed the switch by disconnecting the plug and dropping half a paperclip in between pins 1 & 3 and taping it up with electrical tape. WIll have to replace the switch at some stage.

Lesson learnt: While the Nanocom is great for throwing up faults, you need to actually do a bit of intelligent thinking with diagnosing faults, and not just assume that because a code is thrown, then that is the fault itself.;)

Quote:

---

Originally Posted by Pinelli

Sorry to bring up an old thread, but I've been getting this error recently, starting with once about 4 months ago, then 2 weeks ago, and now three times in three days. Unfortunately, the TD5 doesn't go into limp mode, the engine just shuts down completely, and I have to coast to somewhere safe to stop. I get both the M&S lights and the hazard lights. Clearing the fault stops the M&S lights, but not the hazards. To stop them, I have to pull the earth from the battery, and leave it off for 10+mins. After that, I can get the truck going again.

Had a few suspects - a dying battery, but replaced that yesterday, with the fault still occurring once today. There is some oil in the red connector to the ECU. I replaced the injector harness last year, so I'm surprised I'm still getting oil, but it could be the cause I guess. Would a faulty XYZ switch cause this problem? Otherwise it sounds like I'm going to be tracking wiring between the ECU and EAT.

Any other thoughts?

---

Just in case anyone can learn about this issue in the future I recently had this issue. I was test driving after swapping out the radiator and I lost power and drive and the engine light came on as it did so. I pushed on and it did this a few more times and then engine turned off, M&S lights started flashing and the temp overheat light came on (it didn't overheat as per Nanocom, engine saver and visual inspection) and the hazards turned on. I couldn't turn off the hazards and car wouldn't start. I eventually found ACE fault 03-04 and had to cycle through a procedure on Nanocom that included turning on and off the ignition to clear fault and turn off the hazards.

Hasn't happened since however I am now worried about using car for my ~1 hr commute given how drastic limp mode was for a seemingly non-critical fault.