I know that that sounds pretty basic, but really it will not start. Right now I am just trying to find the ECM. I have a manual but the ECM is not were the manual says that it should be. Do you have an idea where I should look? I have looked under the glove box as well as under the passanger seat. No luck. So if you could tell me that would be great. Thanks so much
I started my 92 legacy wagon,it ran for 20 seconds,then died. Now when I try to start it, it turns over but will not start,and a strong smell of gas. I changed the plugs and they all smelled of gas really bad. any ideas what it could be?
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Re: Can't find the ECM
Hello if its not were you checked look behind passenger kick panel its were you put your feet right side remove plastic hold down plugs or screws remove side kick most likely mounted standing up if not look up with the glove box closed to the right passengers side it would be mounted on a bracket standing straight up silver in color size of a car stereo goodluck please rate
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Was original PCM dead? Has the 'new' PCM been working at all? The p1602 DTC is set when the battery voltage was detected as low or disconnected. Do the basics and check the battery terminals are clean and tight and that he engine has a good earth lead to the body. Check that battery voltage is 12.4v or higher. Check the fuses and relays. Clear the code and retry to start. If possible try the 'old' PCM if it was working before being swapped out.
The fuel pump is in the tank, and should be accessible through an access panel in the hatch, if you look under the carpeting.
It sounds like something else went wrong with the car though - if it simply was fuel-starved, you shouldn't have gotten the smoke/burning smell. There are a lot of electronics in the dash and any one of them could've fried. Unfortunately without taking some things apart, it's going to be very tough to figure out what caused it.
Your ignition switch supplies power to the start relay, Which is grounded by the engine control module(ECM). The ignition switch also sends a signal to the ECM that it is in crank mode, Which causes the ECM to ground the relay, this turns the starter. You have three possibilities, two are wiring, the other is a bad ECM. Both wires are to the ECM from the ignition switch. One is shorted to a hot wire, the other is shorted to ground. The ECM is just shorted to either. My first guess is the the ECM. I would pull it, take the case off the PC boards and clean them. Brake clean is good and a soft brush. Any corrosion will look white to a light green. Especially around the leads/plugs. Also check the plugs. Once this is checked or done, I would go to the wires. Continuity check, power and ground checks. A volt/ohm meter is required. I am sending a picture of wiring, it's for a 2003 GM. This is how they work, but it won't match your color codes. If you want exact, go to alldatadiy.com and you can purchase it.
The fuel pump pressurizes the system and circulates fuel past your fuel injectors. A fuel pressure regulator makes sure there is adequate pressure on the line for the injectors to release the proper amount of fuel when they open (rough explanation). The fuel injectors are controlled by the computer, not really the gas pedal. The computer handles everything for the fuel injection. The gas pedal just opens the throttle plate, allowing more air in. More air needs more fuel, more air and fuel = more power. It all happens very, very fast. Anyway, cranking the vehicle will result in fuel being injected into the cylinders. Without it burning off, yes it could accumulate on the spark plugs and they would appear wet. To work properly, the engine needs (basically) air, fuel, spark, and compression. The timing has to be perfect too.
Look up a quick test on the IPDM ECM relay test. You swap the relay for the computer with one for foglights and test to see if it'll start. That ECM relay has been know to rust internally and fail. Swapping with the foglight relay is merely for testing/troubleshooting purposes. If it works, then you should purchase the proper relay.
There could be many other causes, but this one is pretty easy to try.
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
engine and the automatic transmission (transmission control is
only for automatics, engine is still computer controlled no matter
the transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM or ECM,ECU), which is very rarely the
problem. Other basic checks must be done as well such as mechanical
problems with the engine as well as engine state of tune and mileage
on the engine. The transmission can have mechanical issues as well
such as no gear engagement at all or a failed pump or other pressure
related problems. Also engine mechanical problems can and do cause
many drive-ability related problem such as rough idle and other
First check and see if you have spark at the sparkplug if you do then you need to check your fuel pressure.It sounds like to me that your fuel pump has went out to lunch.When you turn your ignition on try and listen for the fuel you should here it for the first 2 seconds you turn the switch on.
Hello dawniiey: My name is Roger and I will help you. According to All Data the computer is called a PCM. Whether you ask for a ECM or PCM you should get the right part. Should you need further help please just ask. I would be glad to help you. Please rate the answer as this way I know iy was helpful. Thank You for using Fix Ya. Roger
: Sounds like you have
attacked the problem pretty well. Check the fuses. Do a
"pin" check for power and ground to the ECM. When you
replaced the ECM, did you use a new prom? If not, you
could have a faulty prom. Check fuel pressure and using
a Noid light check the pulse at the injectors. For your
information, the injectors will have 12-volts and the
computer momentarily grounds them to open the injector.
Your problems may be caused
by a faulty ignition switch or starter solenoid. Intermittent electrical
problems are difficult to trace. We would suggest first
checking the ignition switch and next the neutral safety
switch You are close to the right
track but check the fuel pressure during the no start
condition as you may have a faulty fuel pump. You also
could have a vehicle speed sensor problem
The ECM is most likey the culprit but I would check ground wires and wiring harness to be sure they aren't faulty. With you telling me the voltage is too high, it pretty much points to wiring but the ECM may have gone bad and its just sending blind signals hence the high voltage. The engine light isn't coming maybe because of the ECM isn't working. Pray it isnt the ECM, its costly but exhaust your options by checking wiring and ground beforing fingering the ECM