No spark condition due to icm wire

I rebuilt engine replaced crank sensor, coil ,ignition control module, and pcm and all the wiring and can't get continuity in my icm wire (icm to pcm wire) head scratcher

My car has 1000000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello. If this occurred right after rebuilding the engine then it may be a defective control module or a pinched wire. It can also be the PCM. I always test the wiring first. If there is not continuity in the wire, then that break in the wire needs to be found. If the wiring is fine, then I have the ignition model and pick up coil tested. Also, keep in mind that if the distributor is not positioned right, then the computer will not fire in the ignition. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the electric system and advise on what needs to be done.

How to Identify and Fix Common car Problems ?

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If the ignition control module has failed altogether, it`ll create a weak spark, and the car won`t start. Check to see if the switch and terminals are free from rust and replace any damaged or broken spark plugs wires as necessary. Alternatively, it could be a bad ignition module.
The ECM controls the ignition system and distributes the electrical power to each individual cylinder. The ignition system must provide sufficient spark at the right cylinder at the precise time and do it frequently. The slightest error in timing will cause engine performance issues.
A Bad Crankshaft Position (CKP) Sensor

If the crankshaft position sensor has failed completely, it will not send a signal to the (ECU) at all. Then, the computer won`t send any fuel to the injectors. This will leave you unable to start the car.

The ECM regulates four main parts of your vehicle`s operating systems: air-fuel ratio, idle speed, variable valve timing, and ignition timing.
If no spark appears, check for broken wires, shorts, grounds or a defective stop switch. Once you have confirmed that the stop switch is working, reconnect the spark plug lead.
stalling: a failing ignition module can occasionally prevent the engine from getting spark, causing it to stall. 4. car won`t start: an engine needs four basic things to run: fuel,compression, spark and exhaust. if the ignition module has failed completely, the vehicle won`t get spark and won`t start.
A faulty ECM can send poor data to your vehicle`s transmission control module (TCM). As a result, the vehicle cannot properly shift gears or apply power, causing the shift to feel awkward, delayed, or even jarring. When this occurs, the engine may sporadically become more active or stall out.
An engine control unit (ECU), also called an engine control module (ECM), is a device which controls multiple systems of an internal combustion engine in a single unit. Systems commonly controlled by an ECU include the fuel injection and ignition systems.
One of the reasons your spark plugs might be firing incorrectly is due to a faulty crankshaft position sensor. It`s this sensor that tells your engine`s computer the position of all the valves and pistons at any given moment. The ECU then uses this information to determine when to fire the spark.
The engine control module does what its name suggests: It controls the engine. If the ECM has died completely, you won`t be able to start your car. Your engine could cut while you`re driving, as well, if the ECU malfunctions. Once you`ve coasted to a stop, you won`t be able to get your automobile started again.
One of the symptoms indicating that your ECM is not working properly is engine stalling or misfiring. Sometimes, this sign doesn`t show that there`s something wrong with the engine but that there`s a malfunction in the engine control unit. The chances are that the engine stalling won`t be consistent.
If the ignition relay shorts, burns out, or otherwise fails while the engine is operating it will cut off power to the fuel pump and ignition system. This will cause the vehicle to immediately stall due to fuel and spark being cut off.
The starter will not have any impact on the engine`s ability to produce spark. There are a number of issues that may cause an ignition system to not produce spark. A bad crankshaft position (CKP) sensor (on engines that do not have a distributor), or broken, loose or corroded wires from the sensor to the PCM.
Ignition Control Modules fail when they overheat. The most common symptom of failure is a no-start. A failing module may give other symptoms, such as engine stuttering and stalling, before it stops working.
To test your ignition control module with a multimeter, you place the red lead on the positive ignition coil terminal and ground the connection with the black lead. Your assistant then cranks up the engine and you check if the multimeter reads between 0.4 and 2 ohms.
The crankshaft position sensor monitors as a multifunctional sensor used to set ignition timing, detect engine RPM and relative engine speed.
But the ECM (all by itself) can do nothing. It first must be programmed. These are the instructions the engineers have given it so it can perform its primary function — maintain the vehicle`s emissions levels.
The most common source of ECM failure is in one of the wiring harnesses. If the wires to the transmission or fuel injectors become corroded, they can lose conductivity, leading to a failure. Fortunately, these issues can usually be resolved by replacing the corroded wires.
Differences between ECM and PCM

ECMs are in charge of regulating the engine. PCMs are in charge of controlling the powertrain. Engine control modules (ECMs) continually monitor engine characteristics and make modifications to guarantee peak performance.

Bad Sensors

Sensors that fail to send information to the computer may cause the engine to run less efficiently, and they can sometimes be the cause of an engine that won`t start. One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft.

your engine misfires and shakes: if a map sensor reports a false high pressure reading, the engine`s computer will signal for more fuel. this results in a rich mixture, which can foul the spark plugs and cause a cylinder not to fire.
If the programming is present or you are trying to program the module, and it still will not communicate with your scan tool or laptop, the issue could be with the OBDII connector under the dash. Often, the connector can be damaged if the scan tool or code reader has been pushed in and out frequently.
Causes of a defective engine control unit

One of the main causes is a short circuit in the wiring or in components, which can cause them to burn out. This short circuit is often caused by external influences, such as the wrong start of the car.

The ECU/PCM can be modified/reprogrammed by a myriad of aftermarket systems, a process that is commonly called `Chipping`. These modifications are not designed, validated or tested for your specific vehicle and market, and will often come with various trade-offs that the aftermarket suppliers are willing to make.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

No spark condition due to icm wire
ANSWER : Hello. If this occurred right after rebuilding the engine then it may be a defective control module or a pinched wire. It can also be the PCM. I always test the wiring first. If there is not continuity in the wire, then that break in the wire needs to be found. If the wiring is fine, then I have the ignition model and pick up coil tested. Also, keep in mind that if the distributor is not positioned right, then the computer will not fire in the ignition. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the electric system and advise on what needs to be done.

Engine will not stay started. I have replaced idle control valve map sensor spark plugs spark plug wires no check engine light is
ANSWER : You have a problem with the distributor assembly. I recommend replacing the distributor assembly. This will replace all the possible sensors and coil for the ignition and fix the problem you have.

Spark plug chaos. Rubber stoppers are preventing the spark plugs from coming out.
ANSWER : Hi there. Try using a pair of small needle nose pliers to pull off the rubber boots from the spark plugs. As you pull, twist the rubber boots to break them free. If you cannot get the rubber boots off, then try using some mineral oil on the boots to aid them off, then clean off the oil with soap and water with degreaser. If you need further assistance with removing the boots from the spark plugs, then seek out a professional, such as one from Your Mechanic, to help you.

Spark plugs,spark wires,icm,ecm,ignition coils,replaced engine,crankshaft sensor,harmonic balancer car still misfires, wont start
ANSWER : Hi there. If your car had overheating issues before this misfiring issue began, it is quite possible that you have some internal engine damage like a blown head gasket that is the primary source of your troubles. Other damage to cam sensors and ignition timing and fuel components can also cause these issues. Before you sink another dollar in attempting repairs, I would strongly recommend having a professional mobile mechanic from our team come to your location and complete a car is hard to start inspection so they can pinpoint the root source and recommend the best course of action.

Car turn over won’t start have new battery starter and altinator and changed spark plug and spark plug wires and crankshaft sensor
ANSWER : Hi there. The first thing I would recommend would be to have a professional mechanic complete a digital scan of your ECU to see if there are any stored error codes that might pinpoint the source of your problem. However, one thing you might want to check yourself is the electrical harness connected to the crankshaft position sensor. In most cases, if this is diagnosed a being damaged, it’s actually the harness that is bad and needs to be replaced.

Hi good day, how many spark plugs and spark plug wires do i need for a 2005 Kia Sorento LX?
ANSWER : Hi there. Since you have the V-6 engine option for your Kia Sorento, the correct amount of spark plug’s needed and spark plug wires is (6) – one per cylinder.

Spark Plugs spark once
ANSWER : Either a failing crankshaft sensor or impulse wheel could be the cause of the fluctuating RPM reading. The crankshaft sensor signal is often used to start both fuel pump operation and start the ignition coils with the camshaft sensor setting the sequential injection and ignition firing order.

You may want to have faults read out of the ECM prior to replacing the crankshaft sensor and look at the crankshaft sensor wheel. If the sensor is mounted on the front of the engine the sensor wheel may be part of the dampener and may have slipped or vibrates. If it is a sensor wheel that is part of the flywheel, a bent tooth may be the cause. To have this resolved, you may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the equipment and expertise to correct this hard starting issue.

Does anyone know the spark plug firing order for a 1992 Ford Ranger 3.0 V6? Changed out my spark plug wires, starts wants to die.
ANSWER : Hi there. Here is some info for you to review. 1991-1994 2.9L and 3.0L Engines Firing Order 1-4-2-5-3-6 – 1995 And Later 3.0L V-6 With DIS Ignition System Firing Order 1-4-2-5-3-6.