So, as I expected, my 96 disco, purchased out of state, failed emissions.
Problems...
1. Insufficient Coolant Temp for Closed Loop Fuel Control
*not sure what this means. Its not running hot, Didn't lose a drop of fluid
after a 250 mile home.
2. O2 sensor Circuit High Voltage Bank 2, Sensor 2
3. O2 Sensor Circuit High Voltage Bank 1, Sensor 2
4. and probably the most worrisome problem, the MIL (Check Engine) failed to
come on.
*My guess is that someone disconnected it to hide a problem, but I want
to hook it back up to start figuring out the problem.
Are these problems something I can fix or do I really need to take it to an emissions repair place. I got the truck dirt cheap, its solid, runs great, and is in really good condition. So, if I need to pay repairs and/or get a waiver, that's fine. These seem to be electrical problems as much as exhaust problems.
1. I would think is the coolant temp sensor. If it fails to send the appropriate reading to the ecu it thinks it has never warmed up. Pretty easy fix
2/3. There are tests on here to figure out if the o2 sensors are bad or not. I would just go ahead and replace them. pretty easy fix as well.
4. probably a pulled/burnt out bulb. Like Gunny said when you turn the key to the on position check to see if it lights up.
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"Only two defining forces ever offered to die for you, Jesus Christ and the American G.I. One died for your soul, the other for your freedom."
PROM stand for Programable Read Only Memory. As you know, your fuel injection is called GEMS, which stands for Generic Engine Management System.
Its generic, so it can fit many different cars. The PROM is a removable 16 pin chip that holds the Fuel/Ignition mapping stragey. When you hear someone "Chip" their car, this is what they are talkign about.
Got it, so what's going to fix Closed loop fuel control? Do I need or can I get the PROM that will fix the problem? Can I just reset it? Or is it something more involved.
Sorry for my ignorance, I'm a Jeep guy and it doesn't even have a Catalytic Converter and I can't tell you the last time I had to go through emissions with a vehicle. Connecticut didn't have an emissions program for like 10 years and I only have to take it because its an out of state vehicle.
I dont know what yoru state requirements are. If they are pluging into it, that means they are IM240. That means they are all the readiness tests have been done.
If you are looking to just sneak through, you can clear it, run it for a drive cycle (Not JUST around the block) and see if the code comes back.
It surfaces USUALLY below freezing, so you might be able to sneak through.
THe correct fix is the no longer avalible PROM. Discos from 97-99 have it in theres. Maybe, if you can find a broken computer of these years(Cheap) you can swap proms.
actually, you can still get the prom I just wouldnt deal with it.
before the prom, try a thermostat.
but that code is what we call the second cup of coffee code. leave the heat on while its running when its cold out side and the thing kicks on because the engine cant heat up fast enough.
oh and if you really think its a sensor, take it out and throw it in the breakroom freezer with a thermometer. thats what I did to test mine. of course I did have the graph that shows the proper resistance.
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I work on Rovers. Got a question just ask.
OK, sounds like...
1. Fix the "Check Engine Light" because it CANT pass if that doesn't work
2. Reset the Codes so that I can actually get a legit reading.
3. If the codes DON'T come up, then those sensors are cool, if the codes DO come up, then those sensors actually have to be replaced.
The engine needs to warm up in a Window of time. If the engine does not reach the temp it wants in the window of time, the computer sets a p0125 code.
In 96, the prom was updated with a different window of time in freezing temps.
Either.
1) Your thermostat isn't warming the engine as fast as it should. Thus, the sensor is correct, adn the computer is making the correct call.
2) The sensor is giving the computer bad intel, thus the computer is making the wrong call because it has bad information.
3) The computer is still using the only program, where its getting the right info fromt he sesnor, but is basing a failure on what it is told in its programming. The computer is making the right call based on what it knows...But what it knows is wrong.
Your LR Disco 96 is "OBDII" compliant, and all troubles are store in the "blackbox" - CPU of the car. Please be advised to get a OBDII scanner to check out the troubles and have them fixed if you cannot DYI. They are now available in many Auto parts store.
>Your Disco has the Advanced EVAP systems, you need to fix its emissions problems, otherwise you will not pass the inspection:
*Regarding the:
-O2 sensor Circuit High Voltage Bank 2, Sensor 2
-O2 Sensor Circuit High Voltage Bank 1, Sensor 2
You car is informing you that your oxygen sensors are not sending the proper signal back to the CPU. And without those feedbacks the fuel/air mixture is out of order, and this causes the emission problem (too much or little fuel or air) and triggles the MIL (check engine light). Even though the light is off/burnt out, still the trouble is stored in the blackbox, believe it or not. It looks like your Oxygens sensors are worn out!
Bad news: you disco has a pair of catalytic converters and two pairs of oxygen sensors (two O2 per catalytic converter, one in the front blank, another in the rear blank).
Action: Please be adivised to replace those O2 ASAP before you even lose your catalytic converters due to the misfiring problem.
If you are DYI, solve one problem at a time, reset the code, road test, check again to see if the trouble has been fixed! This is where your own scanning tool becomes important.
Why I failed emissions... now what
)
Linear Mode
