Diagnostic output

[Velocette]

Hi. I know I can find this out by experimentation but I want to be ready to do the diagnosis when I start pulling things apart so...

Can I use a 12V Bulb instead of a voltmeter to read the codes (1995 2.5D)?
I am sure old my digital voltmeter is nowhere near fast enough and I don't want to by an analogue one if a bulb will do just as well.

I had the hold light flashing and no hold function for about twenty minutes yesterday, it cleared itself eventually.

Possibly connected: I had noticed it hunting between gears earlier but put it down to the fact that the car in front was going about the gear change up speed and I used hold afew times to stop it hunting which seemed to work.

[g8dhe]

Not tried one, so not sure what the current capability is, just put a 2k2 resistor in series with any straight LED you have available.
I must have a poke at mine and see what it is capable of then we can make a more informative suggestion!

Most OBD aren't 12volts on the signal wires, but the Bongo does pre-date the more standard OBD units so that isn't a definite either!

[Velocette]

Not tried one, so not sure what the current capability is, just put a 2k2 resistor in series with any straight LED you have available.
I must have a poke at mine and see what it is capable of then we can make a more informative suggestion!

Most OBD aren't 12volts on the signal wires, but the Bongo does pre-date the more standard OBD units so that isn't a definite either!

Thanks, I'll try that I've got a home made LED polarity test lead that fits the bill. Hadn't thought about the current , so glad I asked!

[Rhinoman]

Is this the FEN pin that you're referring to? if so the max. current is around 35mA, limited by a 330R resistor. The FEN pin is wired in parallel to the Hold light so the Hold light should flash anyway.

[Velocette]

Is this the FEN pin that you're referring to? if so the max. current is around 35mA, limited by a 330R resistor. The FEN pin is wired in parallel to the Hold light so the Hold light should flash anyway.

Yes, I would have been connecting the device across FEN and +B with TEN grounded.

Does that mean that just grounding TEN will cause the hold light to flash the fault code?

PS I have just had a look at the diagnostic socket and the only terminal mentioned on the factsheet that has a contact in is +B. I read of a similar finding by someone else on here earlier. I think the cap had H381 in it if that is any help.

[Velocette]

I think I may be getting somewhere now. It appears that the diagram I have been using is either of the plug or the socket looking from the back. I will have to check again when I get home.

[321Away]

you dont need a bulb or indicator as bridging the pins will make the corresponding light (hold light in this case), flash, but the pattern wont necessarily follow the sequence if you were using a bulb. I did this with a 95 Bongo just this week and it gave the stored codes, check this page http://www.philmcfadden.co.uk/MazdaDiagnosticBox.htm, bridge pins E and M for ATX diagnostics and the hold light will flash in sequence.
Julian

[Velocette]

Thanks, that is fantastic. Just what I hoped would exist somewhere on the interweb, everything else I've found didn't quite match my socket.


w

you dont need a bulb or indicator as bridging the pins will make the corresponding light (hold light in this case), flash, but the pattern wont necessarily follow the sequence if you were using a bulb. I did this with a 95 Bongo just this week and it gave the stored codes, check this page http://www.philmcfadden.co.uk/MazdaDiagnosticBox.htm, bridge pins E and M for ATX diagnostics and the hold light will flash in sequence.
Julian

[g8dhe]

Do we know if all the Mazda 626 codes apply to the Bongo ? If so it might be worth getting the 3 facts sheets updated with the info.

[Velocette]

Well it worked!

The Hold light flashed: _.. _......

Which I took to mean 12 16.

I am a bit confused but I think this might mean throttle position sensor and EGR sensor.

As the fault seemed to clear itself I will do a bit of road testing and see if it happens again.

Thanks everyone for their help.

I will put up a picture of the socket with the ESBP device in it in case anyone else is struggling with back to front upside down (to my eyes) diagrams.

The fan started up with the ESBP in place by the way.

ESBP= Eric Sullivan Bent Paperclip

[321Away]

i think the codes you have are a 2 and a 6, as there is a long pulse between the individual numbers so you'll get a long (1 sec) pulse, then 2 quicker pulses, then a space then another long pulse and 6 quicker pulses, if if was code 26, the 2 pulses would be longer, bit like morse code, the dashses (10's) are 2 sec long and the dots, (1's) are 1 sec long.

the 95 we had in earlier this week had solenoids changed etc but no1 bothered to read the code (as i told them to!), so had loads of work done for nothing as code 6 refers to the speed sensor! changed that and was sorted.

Julian

[Velocette]

i think the codes you have are a 2 and a 6, as there is a long pulse between the individual numbers so you'll get a long (1 sec) pulse, then 2 quicker pulses, then a space then another long pulse and 6 quicker pulses, if if was code 26, the 2 pulses would be longer, bit like morse code, the dashses (10's) are 2 sec long and the dots, (1's) are 1 sec long.

the 95 we had in earlier this week had solenoids changed etc but no1 bothered to read the code (as i told them to!), so had loads of work done for nothing as code 6 refers to the speed sensor! changed that and was sorted.

Julian

Does the 2 refer to crankshaft position sensor? If so do I infer that there has been a fault in either or both sensors or a lack of correlation between the two?

None of the instructions have mentioned "stop" pulses but then they haven't mentioned multiple code display so it would make sense.

Cheers, Eric

[Velocette]

The flashing hold light happened again on Sunday, it only lasted half a minute this time and then stopped. I had noticed a tendency of the gearbox to hunt a bit earlier but put my foot down a bit and it settled down.

This time I filmed the sequence flashed by the hold light. It was the same as before:

http://www.youtube.com/watch?v=13Xa11_tLtM