I changed the icm and coil pack on my 2004 Malibu classic and the theft light turns off and try to start it and does a little pop noise and just turns over and want start up. Please help.

OK now 2.2l told. L61 is GM name real name.
ALL FUSEs checked first(ALL)
CPS is 1990 name is NOW CMP
crank sensor is CKP
stop reading web sites on 1990 cars, they are gone .

2.2L is not at all like the Turbo with 4 cops and CMP real.

also , 303 means this.
1: bad engine, cyl 3. weak bad compression
2: bad spark.#3
3: bad injector #3 swap with 4, and see of failure follows to #4.

2.2 L ) L61 GM only.

let me read the SM service manual on your L61 engine GM.
a 2 wires CKP crank sensors, that must not be bad. or all spark ends, not just #3 ever. CKP goes only to ECM. so we skip this/


The ICM runs a super strange, Ignition coil 4 in 1.
ALL IN ONE COIL PACK, FIRES 1,3,4,2 AND VERY HARD TO TEST, IN A GIANT SANDWICH COIL PACK. (PAINFUL THIS)
the CAM sensor is part off the ICM.
(virualized synthetic)
THE STATEMENT BELOW NO MATTER HOW ODD IS HOW IT DOES A VIRTUAL CMP SENSOR.

"The ICM detects if cylinder?1 or cylinder?3 is on the compression stroke by sensing the secondary voltage and polarity of each side of the ignition coil. The higher voltage is on the compressing cylinder. This is called compression sense ignition. The ICM provides a synthesized cam signal to the ECM based on these inputs. The ECM uses the cam signal to synchronize fuel injection. This system consists of the following circuits:"

If the ECM receives an intermittent CMP signal from the ICM, DTC P0341 sets."

compression sense ignition.! <<<< learn this first
if compression is bad on #3 the ICM WILL BE CONFUSED
that is why techs, check compression first.
and no EFI on earth can run a dead engine(mech. hard failed)
for sure this one in SPADES.

most cars do not use. compression sense ignition.
and this car can not do CMP unless engine is good first. see how that matters here so much.
I hope so.

Get the battery charged (just replace it) and leave the key on for 15 minutes. Turn it off for 30 seconds and see if it starts.

Hi Rita, What are you saying here , your engine turns over or not ? No Crank No Start Diagnosis EricTheCarGuy

Test all your fuses using a test light with the key on.

Grab a test light go down to the starter, hook to a good ground and probe the battery cable. If that has power probe the solenoid engage wire( its the little one) have a helper turn the key to start if that gets power replace the starter.

well since you have already eliminated some possible causes now try the ignition module its the plate underneath the coil pack it is not a coil because then it would be misfiring on both cylinders to the coil and 1 goes with 4if this does not solve your problem only one thing left a bad computer causing this problem if you use a scanner you will see it actually is detecting the misfire through the injectors and that means the injector drivers in the computer are worn out. i have seen this several times and when you replace the computer it will have to be reprogrammed by a chevy dealer because the anti theft will not allow it to start . hope this helps you.

Actually all your problems could be caused by a weak battery. Take the battery to your auto parts store and have them test it. If you've never changed the battery it's old enough to need it.

did you check the ICM (ignition control module) that's what the coil pack sits on. Inspect if for wire damage and you can remove the ICM and have it tested at Auto Zone or Parts Source free of charge.
Thank you for using FIxya and good luck

Check your installation connections, also check the model of your alternator. GM is notorious for having several alternators that fit, but due to the diodes and circuits in them they may not electrically match. Look for a fuse-able link that may have burned out .

Happens all the time to me. I trigger the Theft System by accident then the car won't start.  try this: Put the key in the ignition. Turn it to the "on" setting,but don't try to start the engine. Let it sit for 10 minutes until the Security light stops blinking and turns off. Take the key out and restart. Warning - don't have your lights, radio,etc on while you do this or the battery may die.