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  #31  
Old 05-19-2008, 11:46 PM
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Yea so I just unplugged both the sensor plug (two pins/wires) next to the battery and the larger plug under the fuse box. I instantly got a P 1495 code. I'm going to radioshack in a little bit to get the resistors and try it out.
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  #32  
Old 05-20-2008, 12:44 AM
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Yea so I got the resistor. (1/4 watt 100 ohm) I put it in the leak detection pump harness and the engine light doesn't come on. BUT once I unplug the other thing, I'm not sure what it is (under the fuse box) the engine light comes on (didn't look at the code even though I should of). So now I reset the computer with the reader and put the resistor in the leak detection pump and plugged in the other thing. I start it up and no engine light! Halfway done I guess.

This is the "thing" the fuse box


This is the harness off the "thing" that if it's unplugged, the engine light comes on



These are the hoses off the "thing"
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  #33  
Old 05-20-2008, 12:46 AM
DaKoTa-BoY DaKoTa-BoY is offline
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the thing under the fusebox/behind battery is the leak detection pump, the other piece with the 2 wires going to it is the evap solenoid. keep it up, and find us a way to get rid of it please!!!! i want to be able to ditch the whole system.
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  #34  
Old 05-20-2008, 01:02 AM
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Ok I must of gotten it backwards.

It has three prongs...I don't know what to do, maybe try and put the resistors in there?? I'll be back.
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  #35  
Old 05-20-2008, 01:24 AM
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Ok so, the resistor thing works for the evap solenoid (what I originally thought its the leak detection pump)





Now, as soon as I discconect the leak detection pump harness, which is three wires (not two) the engine light comes on and throws P 1495.
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  #36  
Old 05-20-2008, 01:46 AM
DaKoTa-BoY DaKoTa-BoY is offline
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Quote:
Originally Posted by ddrango View Post
Ok so, the resistor thing works for the evap solenoid (what I originally thought its the leak detection pump)





Now, as soon as I discconect the leak detection pump harness, which is three wires (not two) the engine light comes on and throws P 1495.
yep, do you have a FSM? it describes the functions of the LDP and exactly what it does and such, maybe it could help you out. If you need i can probably send it to you in a pdf file
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  #37  
Old 05-20-2008, 02:00 AM
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Quote:
Originally Posted by DaKoTa-BoY View Post
yep, do you have a FSM? it describes the functions of the LDP and exactly what it does and such, maybe it could help you out. If you need i can probably send it to you in a pdf file
Yes, please, right now if you can.

rar219@gmail.com
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  #38  
Old 05-20-2008, 02:27 AM
DaKoTa-BoY DaKoTa-BoY is offline
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LEAK DETECTION PUMP MONITOR (IF EQUIPPED)
The leak detection assembly incorporates two primary
functions: it must detect a leak in the evaporative
system and seal the evaporative system so the
leak detection test can be run.
The primary components within the assembly are:
A three port solenoid that activates both of the functions
listed above; a pump which contains a switch,
two check valves and a spring/diaphragm, a canister
vent valve (CVV) seal which contains a spring loaded
vent seal valve.
Immediately after a cold start, between predetermined
temperature thresholds limits, the three port
solenoid is briefly energized. This initializes the
pump by drawing air into the pump cavity and also
closes the vent seal. During non test conditions the
vent seal is held open by the pump diaphragm
assembly which pushes it open at the full travel position.
The vent seal will remain closed while the
pump is cycling due to the reed switch triggering of
the three port solenoid that prevents the diaphragm
assembly from reaching full travel. After the brief
initialization period, the solenoid is de-energized
allowing atmospheric pressure to enter the pump
cavity, thus permitting the spring to drive the dia-phragm which forces air out of the pump cavity and
into the vent system. When the solenoid is energized
and de energized, the cycle is repeated creating flow
in typical diaphragm pump fashion. The pump is controlled
in 2 modes:
Pump Mode: The pump is cycled at a fixed rate to
achieve a rapid pressure build in order to shorten the
overall test length.
Test Mode: The solenoid is energized with a fixed
duration pulse. Subsequent fixed pulses occur when
the diaphragm reaches the Switch closure point.
The spring in the pump is set so that the system
will achieve an equalized pressure of about 7.5” H20.
The cycle rate of pump strokes is quite rapid as the
system begins to pump up to this pressure. As the
pressure increases, the cycle rate starts to drop off. If
there is no leak in the system, the pump would eventually
stop pumping at the equalized pressure. If
there is a leak, it will continue to pump at a rate representative
of the flow characteristic of the size of the
leak. From this information we can determine if the
leak is larger than the required detection limit (currently
set at .040” orifice by CARB). If a leak is
revealed during the leak test portion of the test, the
test is terminated at the end of the test mode and no
further system checks will be performed.
After passing the leak detection phase of the test,
system pressure is maintained by turning on the
LDP’s solenoid until the purge system is activated.
Purge activation in effect creates a leak. The cycle
rate is again interrogated and when it increases due
to the flow through the purge system, the leak check
portion of the diagnostic is complete.
The canister vent valve will unseal the system
after completion of the test sequence as the pump
diaphragm assembly moves to the full travel position.
Evaporative system functionality will be verified by
using the stricter evap purge flow monitor. At an
appropriate warm idle the LDP will be energized to
seal the canister vent. The purge flow will be clocked
up from some small value in an attempt to see a
shift in the 02 control system. If fuel vapor, indicated
by a shift in the 02 control, is present the test is
passed. If not, it is assumed that the purge system is
not functioning in some respect. The LDP is again
turned off and the test is ended.
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  #39  
Old 05-20-2008, 02:28 AM
DaKoTa-BoY DaKoTa-BoY is offline
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sorry, i couldnt figure out how to get 2 pages out of the 22xx pages
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  #40  
Old 05-20-2008, 03:11 AM
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Quote:
Originally Posted by DaKoTa-BoY View Post
sorry, i couldnt figure out how to get 2 pages out of the 22xx pages
I need info on wiring, voltage and ampage in the wires. Those three wires, I need to know which one does what, so I can figure out it I can use a resistor on them or something.
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  #41  
Old 05-20-2008, 03:25 AM
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You can unplug the purge solenoid and ptu the resistor in and it won't pop a code as long as the vacuum lines are still hooked up. If you disconnect any of the vacuum lines from the purge solenoid or the ldp, even with the resistor, you will get a check engine light.
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  #42  
Old 05-20-2008, 04:59 AM
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Quote:
Originally Posted by hskrRT View Post
You can unplug the purge solenoid and ptu the resistor in and it won't pop a code as long as the vacuum lines are still hooked up. If you disconnect any of the vacuum lines from the purge solenoid or the ldp, even with the resistor, you will get a check engine light.
I'll try this tomorrow.
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  #43  
Old 05-20-2008, 05:48 AM
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Update...I think I've figured out a way to do this. Update tomorrow!!!!
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  #44  
Old 05-20-2008, 08:16 PM
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Ok, so chances are there is going to be a relay needed for the LDP harness. Again, thats the four socket prongs/wires. One wire is a ground, one wire is constant power, and one wire is a switched power that goes on/off according the the pressure inside the pump.

I'll be back later with more info, working on this today.
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  #45  
Old 05-20-2008, 08:39 PM
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Quote:
Originally Posted by Rebel13 View Post
Less weight, less engine bay clutter, and a better A/F ratio.
has it been tested? if so, whats it at now versus stock?
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