Toyota 100 series and DP Chip problems
Submitted: Thursday, Apr 01, 2021 at 21:21
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Member - pedro1
I have a intermittent problem , five times in 10,000 Kms the cars engine management light comes on and a couple of kms later the car goes into limp
home mode. The problem only has occurred when towing a 2.5 ton caravan and driving uphill, usually in 4th dear ( its a 5 speed auto ) its a 2006 1HD FTE 230,000 km
I turn the engine off and 10 minutes later all is good. My mechanic said it is a throttle body error code, which lots of things can cause. He could find no hose or wiring issues .He suggested removing the DP Chip when it next occurred, I did that on the next occasion and retackled the same hills . No problem. Put the DP chip back in and drove the same hills slowing down to 40km then flattening it in 3rd gear to 3500 RPM . Of course the problem didn't reoccur.
I consider it is not a heat or vibration issue as all occurances have being on the bitumen not offroad.
So I would like to know if anyone else has had similar issue with the DP chip or any other ideas
of possible cause?
Reply By: Mike C9 - Friday, Apr 02, 2021 at 13:00
Friday, Apr 02, 2021 at 13:00
Hi Pedro
I have a 2010 Prado and I fitted a DP chip several years ago. It started giving me the same problem that you described however, when I disconnected the chip but left the wiring connected, it still did the same thing (intermittently). After removing the DP chip wiring, the problem went away.
I took the wiring loom to Berrima Diesel, where I bought the chip, and Andrew found some dirty contacts in one of the plugs. He cleaned them and the problem disappeared. I reinstalled the chip and did a
Sydney to
Cape York trip towing a 2.5t van without a problem.
Six months later, I was driving without towing and the engine blew a hole in #3 piston! $13000 later after a complete engine rebuild, the chip and its wiring have been removed and never reinstalled. The original pistons were replaced with forged pistons and the injectors were replaced with "upgraded" items from Baileys in
Wollongong. The guy that did the rebuild suggested that the chip was a contributing factor to my problems.
That was five years ago. I've since towed the same van to
Darwin and back, the
Grampians in Victoria and lots of other
places and I believe that the engine performance is as good if not better than with the DP chip.
Mike
AnswerID:
635844
Follow Up By: Member - pedro1 - Friday, Apr 02, 2021 at 19:33
Friday, Apr 02, 2021 at 19:33
Mike, thats sounds scary . I wonder how you disconnected the chip but left the wiring connected ?
I have had to disconnect the DP chip wiring to plug the original wiring back together.
A couple of months ago I also inspected the DP Chip wiring as part of my fault finding and found some corrosion on one of the DP Chip plugs. I got a auto electrician to replace the plug and to also replace the inline DP Chip fuse in the effort to eliminate possible causes
FollowupID:
913552
Follow Up By: Mike C9 - Saturday, Apr 03, 2021 at 09:35
Saturday, Apr 03, 2021 at 09:35
Pedro
My DP chip came with what I would call a loopback or turnaround plug. The instructions said that if you want to remove the chip for any reason the plug could be inserted in its place and it would loop the wires from the injectors back as if the loom wasn't there.
It may be different on the 100 series.
Mike
FollowupID:
913562