Thread: ENGINE SYSTEMS FAULT......HELP

Mine (D4) and Dads (the D3) tow 2300kg of Cat on cruise without issue.

No loss of power or errors up hill or otherwise.


"Where the Desert meets the Sea"
'Did I mention some great 4WDriving is just 5 minutes from home?'

Originally Posted by Disco4SE

My thoughts are if I am to use cruise control while towing............leave in sports mode and overide the cruise by using the accelerator pedal up hills.

This is only going to make the engine work harder unless CC is cancelled which would then allow speed and thus engine load to be reduced.With all the smartness in the gbox and engine ecus I wouldn't expect any problems at all except perhaps if using command shift when some attention may need to be given to ensure the engine doesn't excessively labour.

Originally Posted by Disco4SE

You are right about the CC cancelling. When cruise is on and Sports mode is selected, the auto still stayed in 6th......even up the steepest hills.
My thoughts are if I am to use cruise control while towing............leave in sports mode and overide the cruise by using the accelerator pedal up hills. Either that, or just don't use the cruise.

Cheers, Craig

May be more about towing than CC. According to the owners manual, when a trailer's connected, the auto will hang on to gears to avoid excessive 'hunting'. Its hard to tell but I felt shifting to sport when under load encouraged it to kick back.

If in sports mode (or not) and you accelerate up a hill with cruise control on, the CC will cancel, the auto should / maybe change down, then resume CC once speed is back to the set speed, thus letting the engine do its work and relieve pressure on the auto & torque convertor.

The engine management system should be smart enough to cope with towing in drive and not have to worry about the engine shutting down.
Hopefully the patch has fixed this.
If I have problems on my return to the Peninsula, I'll let you know.

Cheers & Happy New Year, Craig

The computers and software can be funny things.

I had a heap of faults a few weeks back and the display cycled through them, "gearbox fault", "Park Brake fault", "stability control not available drive with care"
"emergency park brake no available".

All these meant that I had no sports shift, no suspension lowering or raising and the car felt pretty crap to drive like the suspension was not active.

Anyway I took it into the dealer and they found an abs fault, cleared it and all is now fine. One thing he did say however was that they found a lot of faults had been caused by customers driving with one foot on the brake and one on the accelerator confusing the computer.

Originally Posted by Disco4SE

Took my D4 into Blackfords in Albury this morning. They looked at it and went for a test drive straight away.

I can't praise Blackfords enough. They attended to my vehicle straight away, were extremely friendly and gave me a stubby holder.
,
Craig

I thinks it is Blacklocks you mean and not Blackfords.

Your experience with them mirrors mine too. Great place to deal with.

Originally Posted by brad72

Anyway I took it into the dealer and they found an abs fault, cleared it and all is now fine. One thing he did say however was that they found a lot of faults had been caused by customers driving with one foot on the brake and one on the accelerator confusing the computer.

Somehow this sounds more like a defective brake light switch than anything else. I somehow doubt that anyone was driving with a foot on the brake, but a defective brake light switch could look that way to a computer.

The second set of contacts in the brake light switch talks to the ABS, the downhill retarder and a host of other systems. The link below is to a number file I have in my gallery on disco3 re the brake light switch. One of the files is the brake circuit wiring diagram. It is amazing the number of systems two sets of contacts can tie to.

DISCO3.CO.UK Photo Gallery - Brake Light Switch Replacement

Hi all,
Arrived home from Albury this afternoon after towing the boat for 4 hours straight. Ended up using normal Drive (not Sports mode) and no cruise control. The auto changed down as it should and there were no engine shut downs etc.
The car puter showed 13.3 Lt per 100Klm's, which I thought was good, considering most of the trip was at 115 Kph.

However.............I now have another glitch. When I back off the accelerator at a steady speed on the freeway, the vehicle speed backs right off and I have to put the pedal down to build up speed again.
Has anyone else experienced this???

Cheers, Craig