collecting parts for winter project.....

[Pride]

Surely it would be wiser to just buy a new one or would that blow your budget??? (and inventiveness)

[Kaz-kzukNA1]

Hi, Jonathan,
Interesting finding.
On other model ABS, there are knows soldering cracks causing ABS warning light but Nissin ABS seems to be fine.

Could you check the white bar code label on the black lid that you removed?

I don’t know the ABS unit I tested on my NSX was 139A or B but I know the one I saw FR w/speed pulse had bar code with 57105 S2A J50.

The 139A one with the tripod that I didn’t test had bar code ending 951.

Interesting to see if you can get all four w/speed pulses on AP1 ABS.


Kaz

[britlude]

Surely it would be wiser to just buy a new one or would that blow your budget??? (and inventiveness)

-Z03 already on its way!

[britlude]

well... just to end this little S2000 ABS modulator adventure, i soldered in the missing links on all 3 ABS units.... and there was no change! the unit with the FLP and FRP signals was the only one to have any output pulses, but still on just the FLP and FRP pins. no other pins gained signals!

the -139B, no TPS signals


the -139A no TPS signals


and the -139B that has just the FTP and FRP signals, but nothing relating to the rear wheels


confirming the 57105 S2A J50 has the front TPS outputs, but not a lot of use without the corresponding rear ines!

[Kaz-kzukNA1]

Hi, Johnathan.
Not sure how you connected the mock-up w/speed sensor but when you have a chance, could you do the following?

Connect the sensor to the rear side before powering up the system.
Set SCS input at low level before powering up the system.
Power up and perform error code clearing sequence using brake pedal inputs.
Confirm error code cleared by fast blink of ABS light twice.
Power off, remove SCS, power up and see what happens to the rear side signal first.

Just hoping the software is disabling the rear signal if it detected any error although very unlikely if thinking in logical way.

Kaz

[britlude]

i've set it up with dummy 1k ohm loads to simulate the abs sensors, and jump in the abs feed where appropriate....


after going through the reset procedure, i tried each channel in turn, alas i only got an output signal on the FLP and FRP as before


if i removed any of the loads with the unit switched on, the computer detects the abs sensor has gone open circuit and switches on the ABS light accordingly!

[Kaz-kzukNA1]

Thank you for spending your precious time, Jonathan. You're a star!

So, for some reason, the engineers decided to disable just the Rear side signals through software or hardware then…
Normally, in order to save the cost and to prevent creating multiple software versions, one would use software map or hardware jumper or pull up resistor so select the specific feature using the same base circuit board design with single software version….

Nice analogue oscilloscope from Iwatsu. You can find used one very cheap these days but still, in the era of digital storage, keeping analogue one become handy in several occasions.
That oscillo is known to crack the internal capacitors and ICs but if you can source the parts, fairly easy DIY repair being as analogue.

Kaz

[britlude]

well.. my christmas prezzie to myself arrived this morning....


and out of the box....




and


its sooo purdee, expensive, but purdee!!!!

[britlude]

and i found one of these on the 'bay..... a rare beast indeed!



must sort a better pic!

[Pride]

and i found one of these on the 'bay..... a rare beast indeed!



must sort a better pic!

In your opinion John do you think this is a better/more efficient filter than the newer replacement model??

By the way, Merry Xmas