ABS problem on 1993 300ZX 2+2

ABS problem on 1993 300ZX 2+2 - please read

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me too - 28 Nov 2003 18:30 GMT

My wife's 1993 300ZX 2+2 na developed a problem today that may be
familiar to other 300 owners. The abs unit (in rear hatch area under
a cover) makes a constant "pumping" noise at all times unless I
disconnect the battery cable. Has anybody seen this before and what
was the ultimate fix? The brakes seem to work ok but the constant
"pumping" noise makes me concerned the unit will burn out. It just
started today, and since I'm one of those "high-tech unemployed", I
want to take a shot at it before Nissan puts me further in the poor
house. I have the Nissan service manual, but the troubleshooting
section doesn't mention a problem like this. I'm hoping its just a
locked up relay, but anyone familiar with this problem may really know
the correct answer already.

Thanks,

Bob Crueger.
Dallas, Texas

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Steve - 28 Nov 2003 18:55 GMT

> My wife's 1993 300ZX 2+2 na developed a problem today that may be
> familiar to other 300 owners. The abs unit (in rear hatch area under
[quoted text clipped - 8 lines]
> locked up relay, but anyone familiar with this problem may really know
> the correct answer already.

The relays do go bad but never seen one "lock" or weld the point together
which is what would have to happen for it to "lock". If it's doing this
with the key off, that seems very odd as I don't think it should even be
powered up which the key off!

I'd be looking at the wiring schematic and trying to see why it is powered
on with the key off. Just wondering, has anyone added any electronic gear,
radio, alarm, phone ect lately?

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Steve

http://www.atlantaracing.com

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me too - 29 Nov 2003 00:28 GMT

Steve - Thanks for the response. In looking at the schematic, it
appears the Motor Relay is always hot , and is controlled by receiving
a ground through either the Actuator Relay or the Control Unit. That
explains why I have to remove battery cable to make it stop. It's also
a good sign that it's probably not the control unit as that isn't
energized with the ignition off. I do get a diagnostic code of (9)
which is "Actuator motor, motor relay circuit". The whole assembly is
kind of buried behind panels but I guess that's the next stept. I'm
strongly thinking/hoping that it is just the "motor relay". Any idea
the price of a "motor relay"?

>> My wife's 1993 300ZX 2+2 na developed a problem today that may be
>> familiar to other 300 owners. The abs unit (in rear hatch area under
[quoted text clipped - 17 lines]
>on with the key off. Just wondering, has anyone added any electronic gear,
>radio, alarm, phone ect lately?

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Steve - 29 Nov 2003 01:11 GMT

> Steve - Thanks for the response. In looking at the schematic, it
> appears the Motor Relay is always hot , and is controlled by receiving
> a ground through either the Actuator Relay or the Control Unit. That
> explains why I have to remove battery cable to make it stop. It's also
> a good sign that it's probably not the control unit as that isn't
> energized with the ignition off.

I'd unplug the comtrol unit and see if it still runs.. Then you know it's
something to do with the actuator relay portion. Process of elimination!

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Steve

http://www.atlantaracing.com

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