Wozzer100uk Posted June 28 Posted June 28 Hi guys, Hope everyone is well? I need some urgent help with my 2007 2.4 auto petrol Alphard please. Van has been great but for some reason, every time i book a week away in it something goings wrong! The engine management has come on and the speedo is not working and its not registering the miles driven. I have a fault reader and its showing P0500 speed sensor. Took it to the place i bought it for advise and they scanned it with their machine and shows that code but also that the brake light sensor has gone faulty to, no ABS fault though. We are due to go away next Sunday so need it sorting ASAP. I know from a researching online it could be 3 things: The brake light sensor ABS sensors Transmission speed sensor I have looked online for the brake light sensor which i think the part number is 84340-69025 but on Ebay the Alphard one is £50 but if i google the number that same part number fits other Toyota but doesn't say Alphard for £15? I want to cover all bases and get the parts ordered, so could do with help with the part codes for these items and also not sure how many ABS sensors and transmission senors there are. Any help on this would be greatly apricated so we can get away next week. Cheers
Wisey Posted June 28 Posted June 28 Good evening, I had a similar speedo fault on my 2007 2.4 Alphard and after changing several sensors found the fault to be the retrofit chip fitted to the speedo to convert Kph to Mph and so I reconnected the original wires which gave me Kph speed and Kilometre odometer. I used the power supply to the chip to power a new USB socket and fitted a GPS Mph speedo from Amazon. It works really well, easy to fit and everything cost less than 40quid. Alternatively, you could fit a new chip, a few available from £30 to £90. See the pictures, hope this helps. IMG_2610.mov IMG_2610.mov
Geralt Posted June 28 Posted June 28 I think by brake light sensor you mean brake light switch. Do the brake lights illuminate when you press the brake pedal? If not then that's the highest priority to fix. But in any case, the brake light switch is not used for vehicle speed. The same switch will be used on multiple Toyotas so you can probably get the £15 one.
Tricky Posted June 28 Posted June 28 I’ve had a very similar problem. It was the speed chip sensor that had been added to change kph to mph. Fitted behind the speedo cluster.
Wozzer100uk Posted June 28 Author Posted June 28 Hi guys, Thanks for the info, will get the dealer i bought it from to check the speed chip first before replacing anything. Whilst there was an old fault code for the brake light switch, the brake lights work fine and not been a problem. It was the mechanic who did the diagnostic today that said the brake switch was faulty, even though the lights work and it could possibly affect the abs which in turn could cause the speed sensor fault. When you guys had the similar issue, did you get no speed showing and no increase in miles when driven? Cheers
Wozzer100uk Posted June 29 Author Posted June 29 Hi again Wisey, i have just read your post about the similar issue. Did you have an issue with the idle when the engine management light was on and it showing the P0500 code. Mine was running great but noticed yesterday at start up it would idle at 2000rpm then settle down but in reserve felt like it wanted to stall. You think those issues are just because the engine management light is on so the engine goes into a sort of limp home mode? Would be so happy if it's just the chip. Seems like you went through all the same issues as me. Cheers
Wisey Posted June 30 Posted June 30 Hi Wozzer, yes, I had the same problem when I had disconnected and reconnected the battery, check out Toyota idle reset on YouTube.
Wozzer100uk Posted July 4 Author Posted July 4 (edited) Hi again guys,the issue is turning into a nightmare! On Wednesday i had the chip replaced on the van. Took it for a drive and the speedo worked but then for no reason the front brakes jammed on. I didn't realise at first but as it took a while for them to slowly jam on the more i drove. Managed to get it back and then they stuck to the point that the van wouldn't move, it was like the handbrake was on. The guy removed the chip but still the same issue with the brakes and then he installed another chip. 2 hours later they said it was the speedo sensors on the transmission making the abs come on over 20mph. They disconnected the sensors and the battery and then i was able to move the van but didn't get far before they jammed again. Slowly got it home and the brakes set on fire because they got so hot while driving. I cooled them down and another couple of hours later they were free again. Today i had both the sensors replaced, drove it for 5 mins and all seemed well. Started to drive to the garage to get the brakes checked after they got so hot and then the brakes jammed on again. The auto electrician who did the chip drove past, removed the chip completely and got me moving again so i could get home, same thing happened again. The issue seems to come on as the gears change, it's like they get mixed up and then the brakes lock on. I have spent £400 in the last few days and its now worse than it was before the chip was changed. I have no engine management lights on and I'm really stuck as to what to do next with it. Any advise would be so appreciated . Cheers guys Edited July 4 by Wozzer100uk
Geralt Posted July 4 Posted July 4 (edited) I really doubt the brake problem is being caused by the chip. You can probably ignore it for the purposes of this problem. The ABS and brake system doesn't really care what's going on in your instrument cluster. If I were you I would disconnect the ABS ECU connector to eliminate that as the casue. The brakes should still work but if the problem reamins you have a purely hydraulic issue. Perhaps the process of replacing the brake fluid will clear out any problems? Edited July 4 by Geralt
Rojie Posted July 4 Posted July 4 If possible, refit the old chip, and proceed from there ! Good Luck
Wozzer100uk Posted July 4 Author Posted July 4 Hi Geralt, thanks for the reply. It's just such strange how the brake issue only came after the chip was swapped and now the gear issue.
Wozzer100uk Posted July 4 Author Posted July 4 Hi Rojie, old chip went in the bin but now it's back to factory but I have the new one that came out today.
Wozzer100uk Posted July 21 Author Posted July 21 Hi Werdna, Sadly not yet. It's going to a garage tomorrow to get looked at. They are a specialist tuning shop with a rolling road. Just in case I've replaced the Brake light switch, as I've read posts with other cars that it can cause issues if failing and the car jams the brakes on. Will update once it been looked at. Cheers
Geralt Posted July 21 Posted July 21 1 hour ago, Wozzer100uk said: if failing and the car jams the brakes on. As an automotive software engineer, I can say that is very unlikely to be case. Such a single point failure would not make it to production.
Wozzer100uk Posted July 21 Author Posted July 21 Cheers for the advice Geralt.will see what the garage says after they look at it
Wozzer100uk Posted August 1 Author Posted August 1 Hi guys, thought I would update you on the issues I had with my Alphard. So turns out it was two seized capilers and nothing to do with Speedo sensors. I guess because they went at the same time as chip was replaced, the chaps working on it, it's was easy to think it was electrical, ABS issues . All back on the road, all be it with new speed sensors I didn't need but glad it's fixed. Cheers for everyone's help 2 1
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