Re: [DML] Thermal time swich circuit problem, strange need help!
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Re: [DML] Thermal time swich circuit problem, strange need help!



Nathan,

I'll give this a shot.  The cold start valve receives
it's ground via the thermal time switch.  Initially
the switch provides the ground for the CSV.  When the
switch heats up, the connection is broken, ground is
lost and the CSV cuts off.  The hot start relay is a
spare and not used according to the manual.  

With the (#26) relay (spare/hot start) removed, put a
meter across the cold start valve and check the
voltage while cranking.  You should have 12 volts or
more.  If you get the correct reading, you're good to
go.  If no voltage, you've got an open in either the
input side (white/red) or the ground side
(blue/black).  Disconnect your battery, switch your
meter to ohms, and check both sides.  You'll probably
find a connector is corroded or the P.O. did some home
repair that is not correct.

The Blue/Yellow wire will get really hot if you touch
it to ground, it comes straight from the starter
solenoid to the ignition resistor thence to the coil.

If this doesn't correct your problem, contact me off
line with your phone # and I'll call you to help.

Mike    TPS     1630



--- valleyrat12 <valleyrat12@xxxxxxxxx> wrote:

> OK, my cold start valve will not fire unless the hot
> start relay is 
> installed. I removed the thermal time switch
> connector and touched 
> the Black/Blue wire to ground while my wife cranked
> the car: cold 
> start valve fires fuel (with hot start relay
> removed). OK, so 
> normally that means the thermal time switch is bad.
> I just installed 
> a new one today and the problem persists with the
> same symptoms. The 
> cold start valve will only fire if A: the hot start
> relay is 
> installed or B: I touch the Blue/Black wire to
> ground. 
> 
> I am assuming that the switch simply grounds the
> Blue/Black wire to 
> complete the circuit. Is this assumption correct? I
> have jumped the 
> case of the thermal time swich to a known good
> ground (thinking that 
> someone used Teflon tape somewhere) to no effect. 
> 
> If I touch the other wire Blue/Yellow to ground it
> shorts out and 
> gets very hot. 
> 
> In the schematic the two wires simply connect to the
> two terminals 
> on the cold start valve, it does not display how the
> thermal time 
> switch completes the circuit. My skill at reading
> schematics is not 
> all that great, perhaps I am missing something. 
> 
> I apologize for taking so much space on the board, I
> just can't 
> figure this issue out! Thanks in advance for any
> help.
> 
> Nathan
> 2277
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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