limp mode

[tomr45]

hi
i have a 406 110 hdi, i am having a problem with the engine management the car keep blowing fuse 15 (30a) which puts the antiperlution fault. but the car only dose ths when its freezing out side. i have to warm the car up befor i can change the fuse once ive done this the car drives normal. i have checked the wireing and have found no falts or any damage to the soilnoids on the bulck head wich the fuse powers.
i have checked everthing i can think of and im at a loss so any help would b great.

thanks

tom

[steve_earwig]

Hi Tom. I'm afraid the wiring diagrams I have are saying for fuse 15 (engine fuse panel, right?) r/h headlamp, noting or engine management (so it shouldn't run if it's blown). Umm, can I trouble you for an RPO? viewtopic.php?f=18&t=19141&p=196775&hil ... pg#p196775

I'm wondering if this is an early D9 with "additional heating" (heater coils in one of the coolant hoses) which has sodded itself up...

[tomr45]

soz it prob me thats miss red the auto data nd thanks ive checed my car it sosent have the heaters in the coolent

thanks

[Doggy]

The Autodata diagrams are for an early D9, (1999 - mid 2001), or at least the copy I have are, hence Steve's request for an RPO.

Fuse no.s are different on later cars.

[steve_earwig]

Fuse numbers could be different on any 406 The later full-mux diagrams seem to be fairly close but anything else, all bets are off. Especially on the ones they mounted the fuse panels upside-down on.

Oooh, Autodata, hahaha, hehehe, hohoho.

[tomr45]

DSC_0061.JPG

u

[steve_earwig]

Ah, 9612 makes it full-mux. Sedre says... ok, oxygen sensors The handbook says ignition coil (ha), windscreen wipers, oxygen sensor, oil pressure and, erm, injection system

Be a right laugh if Autodata is right.

The diagrams also list fuse 4 for engine ecu, so maybe it whichever one the guy/gal wiring it up fancied.

Windscreen wipers? Oil pressure switch? (Also does temperature)

I know it's unlikely but does the car have a DPF?

I think I'd be tempted to pull that fuse and see what's not working. Obviously it'll go into cripple mode but I suspect that's a red herring, it might be because it's not seeing the engine oil temperature and deciding that, if it doesn't see the information, then it's going to sulk.

[Doggy]

Well done, 2 days older than mine, born in mid-March 2003 so it's a later D9 with fully multiplexed electrics, as Steve says

If we're talking F15 in the engine fusebox, the diagrams I can access suggest it powers all the solenoid valves controlled by the engine ecu:

EGR all or nothing s/valve
EGR butterfly s/valve
Turbo control s/valve
HP pump 3rd piston deactivation s/valve

Disconnecting any of these is likely to give you an EML as it will fail the power up self test. I think I would start by checking the resistance of each to see if any is short circuit / look for any wiring damage.

[steve_earwig]

Which is what Autodata said

[Doggy]