[urq] Looking for a MAC-02 for 1983 URQ

[alexander stickler]

By stuck, I mean that I can't adjust it at idle.  It
moves around a bit while the car is warming up, but
then, once warm, it's at 50 and only responds to
tripping the FT switch.

I will check the possibility of the switches being
swapped. I hadn't thought of that. Thank you.

I've gotten a few responses. Hopefully, I can find one
locally.

Regards,

Alex
--- "Buchholz, Steven"
<Steven.Buchholz at kla-tencor.com> wrote:

> Where are you located?  I have an extra one I can
> dig out if necessary,
> but I'm a bit hesitant to ship it anywhere ... 
> 
> Duty cycle stuck at 50% ... have you verified the
> functionality of the
> Idle and WOT switches at the ECU?  You say that you
> can see the ECU
> responding to the Idle/WOT switches ... are you sure
> you don't have them
> swapped?  
> 
> I guess I'm a bit confused by your post ... at first
> you seem to
> indicate that the duty cycle is stuck at 50% ... but
> then you say that
> with both Idle & WOT switches tripped you are seeing
> 75%.  Do you know
> if the switches were replaced at some point?  It
> almost sounds like
> you've got a normally closed contact where the ECU
> is expecting a
> normally open one.  Here again, check the switch
> status per the IST docs
> at the connector the ECU plugs into ... 
> 
> Page 21 of Maint & Adjust shows the idle switch is
> on pin 15 to the ECU,
> and the switch should read 0 ohms to ground when the
> throttle is at the
> rest position.  When the throttle is off idle the
> resistance should be
> infinite.  Full Throttle switch is on Pin 21 and
> should be infinite ohms
> normally, and zero ohms to ground when the throttle
> is wide open.  
> 
> Steve Buchholz
> San Jose, CA (USA)
> > 
> > Anyone have a MAC-02  (yellow label - early) for
> my
> > 1983 URQ?
> > 
> > I am reasonably confident that my FI issues (duty
> > cycle stuck @50%) are inside the ECU. According to
> the
> > factory manual, the duty cycle should be around
> 70+/-
> > 6% with the idle switch disconnected and the FT
> switch
> > triggered.  Unfortunately, I get 75 with both idle
> and
> > FT switches tripped. Having checked every wire
> going
> > into the ECU, the diagnostic flowchart leads to
> > "Replace F/TCU."
> > 
> > So, what I am looking for is a MAC-02 to buy or to
> > borrow to isolate the problem.  In the borrowing
> case,
> > I would pay postage both ways. Can anyone help me
> out?
> 



	

	
		
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