Jump to content
Check your Alphards past history in Japan in detail with CarVX ×

Speed sensor fault


Recommended Posts

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

 

 

Link to comment
Share on other sites

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_3241.thumb.jpeg.c254f35280d38c111bd42ff5c3e48ff3.jpegIMG_3242.thumb.jpeg.f5e908e4c39dc978453fb3ca07bb43d3.jpeg

Link to comment
Share on other sites

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.

Link to comment
Share on other sites

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. 

Link to comment
Share on other sites

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

Link to comment
Share on other sites

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 

Link to comment
Share on other sites

Hi Wozzer, yes, I had the same problem when I had disconnected and reconnected the battery, check out Toyota idle reset on YouTube.

Link to comment
Share on other sites

Posted (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 by Wozzer100uk
Link to comment
Share on other sites

Posted (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 by Geralt
Link to comment
Share on other sites

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. 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.