erratic rev counter and flashing hold light

john and jue · Post by **john and jue** » Fri Jun 15, 2007 7:52 pm

any advice,when my bongo gets up to temp the rev counter starts jumping around then does not work at all just after this happens the hold light for the gear box flashes and the hold button has no effect on anything,let the bongo cool down and everything works as it should until it reaches running temp and the problems come back,any body had this problem and can point me in the right direction?

Peg leg Pete · Post by **Peg leg Pete** » Fri Jun 15, 2007 8:01 pm

My speedo used be erratic and the hold light flash, it did it randomly and not has the engine reached correct running temperature. Our speedo was chipped, we have now a genuine M.P.H. mazda speedo, So far running fine

I wonder if your speedo is chipped, could be the reason for problem

Dave up north · Post by **Dave up north** » Fri Jun 15, 2007 8:03 pm

agree... Have heard this before.

john and jue · Post by **john and jue** » Fri Jun 15, 2007 8:10 pm

its still got a kmh clock which still reads speed and milage in kmh

Bumbly1 · Post by **Bumbly1** » Fri Jun 15, 2007 8:51 pm

It could be the speed sensor (generator pulse part No. WL0120H10B) is defective, it was in my case and there are earlier posts on this. Cost around £50 iirc

john and jue · Post by **john and jue** » Fri Jun 15, 2007 9:00 pm

hi bumbly1 when this happened to you and the hold light flashed did the hold button have any effect on the gearbox .mine doesnt when the hold light is flahing

alphabetter · Post by **alphabetter** » Fri Jun 15, 2007 9:10 pm

Bumbly1 wrote:It could be the speed sensor (generator pulse part No. WL0120H10B) is defective, it was in my case and there are earlier posts on this. Cost around £50 iirc

Sounds very much like what happened to mine and this was the cure.

Bumbly1 · Post by **Bumbly1** » Fri Jun 15, 2007 9:39 pm

john and jue wrote:hi bumbly1 when this happened to you and the hold light flashed did the hold button have any effect on the gearbox .mine doesnt when the hold light is flahing

When the hold light flashes, the autobox is in default mode and will not hold or go into 4th gear. The reason is that the gearbox receives signals from the speed generator and when it doesnt get them it goes into default mode.

john and jue · Post by **john and jue** » Sat Jun 16, 2007 8:47 pm

i think your right,i had a look at van today and found the sensor your talking about.i will try and source a replacement on monday.thanks everyone.

karena · Post by **karena** » Tue Jun 19, 2007 5:03 pm

This happened to us last week, I know it sounds stupid but after initial panic we dicovered that removing my husbands phone charger from the cigarette lighter socket cured the problem. It must have been the charger, as the gps works fine in the same socket.

andypaul · Post by **andypaul** » Sun Jun 24, 2007 11:25 pm

Changing rev counter sensor using above part number worked for me too, cost £63 from Mazda dealer

Rkkibongo · Post by **Rkkibongo** » Mon Jun 25, 2007 8:46 am

Check the earthing under the driver's seat. This happened to me after a glow plug change and I discovered that I had not tightened up all of the nuts I had undone to get to the glow plugs. Mine would change gear without warning too!

Nibs · Post by **Nibs** » Mon Jun 25, 2007 8:52 am

hI, THIS MAY HELP. a short while ago i had th ABS light coming on kicking in the ABS itself, posted the question on our fab site and was given the answer that it may be the connections at the back of the speedo duly took of speedo pod and pulled out the connectors gave all a wipe over and put back together and HEY PRESTO all ok. worth a try
Cheers Paul

john and jue · Post by **john and jue** » Mon Jun 25, 2007 6:02 pm

fitted the speed sensor from mazda and jobs a good un

vanvliet · Post by **vanvliet** » Sat Jul 07, 2007 11:40 pm

Hold light flashing - This happened to me today!
I had fitted a 626 MPH speedo ( £10 from a scrappie) yesterday and when i took it out for a good run the 'hold' light started flashing at speed and would not go off even when I decelerated .The 'hold 'button on the shift stick would not operate. I stopped the car ,popped it into park and when i started the vehicle up again it was OK . As it accelerated beyond 30/40 -same again .
Took it home and removed the speedo Unplugged the electrical connectors, gently tightened the 3 screws on the back of the speedo and cleaned the connectors. I then put it back together again and hurrah! , no flashing light at any speed and the hold system now works fine .
Thanks for the tip Nbs !!