How to test the ignition module and crank sensor?

So, if you’re driving a Chevy, a Buick, a Pontiac, or an Oldsmobile with either one of these engines, not forgetting the Isuzu Rodeo or Trooper, this ‘How To Test The Ignition Module’ and 7X (3X) article applies. There are two other articles that may help:

Where is the 24x sensor at the crankshaft?

Test the 24X sensor at the crankshaft for resistance by unplugging the wiring harness electrical connector from the sensor located to the right of and behind the crankshaft pulley. Set the digital volt/ohm meter to “Ohms.” Touch the probe ends of the meter leads to the terminals inside the sensor’s electrical connector.

Where is the crankshaft sensor on a 3.1L V6?

Late 3.1L and 3.4L V6 engines use 2 crankshaft position sensors. One is located behind the crankshaft pulley on the front of the engine and the other is the same one described above.

How to test the resistance of a 24x sensor?

Lay the splash shield aside. Test the 24X sensor at the crankshaft for resistance by unplugging the wiring harness electrical connector from the sensor located to the right of and behind the crankshaft pulley. Set the digital volt/ohm meter to “Ohms.” Touch the probe ends of the meter leads to the terminals inside the sensor’s electrical connector.

How to test the 24x crank sensor in GM 3.1L?

The only way to test the 24X crank sensor is in action (as the engine is being manually cranked) and this article will show you how. If you need to know if this 24X crank sensor test applies to your specific 3.1L or 3.4L GM vehicle, take a look at the ‘Applies To:’ box on the right and scroll with the arrow buttons to see all of the applications.

What happens when the 24x crank sensor fails?

The most important thing to remember, is that when the 24X crank sensor has failed, your car will still start and run (although it may not run great). There’s a good chance that you can buy the original AC Delco 24X crank sensor online for a whole lot cheaper than somewhere local.

Where is the 24x crankshaft position sensor located?

Testing the 24X crankshaft position sensor (located behind the crankshaft pulley/balancer) or code P0336 (24X Reference signal circuit) is an easy test that only involves a digital multimeter!

We’ll first check for the basics like battery voltage and engine Ground to the ignition control module (ICM).

Can a bad ICM cause a crank sensor to go bad?

Therefore, the second symptom that leads you on the path of a BAD ICM or crank sensor is: No spark at any of the ignition coils. Of course, when it comes to Ignition System failures, this is not an absolute truth. These two components could display any number of behaviors when they go bad.

Where is the CKP sensor on the ignition module?

As you can see, the CKP sensor signal is critical for the ECM and ignition control module to start sparking the Igntion coils at START UP and at all engine speeds. The CKP sensor is located on the block.

When to check for a faulty crank sensor?

If your car is running roughly, the engine speed is ‘hunting’, the car won’t start, won’t reach high revs, lacks power or cuts out whilst driving, check to see if you have a faulty crankshaft sensor (error code P0335) or camshaft sensor (error code P0340). Once you buy the parts you can do this job yourself in a couple of hours.

We’ll first check for the basics like battery voltage and engine Ground to the ignition control module (ICM).

How to avoid 5.0 distributor install and setting ignition timing?

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How much is the S10 ignition control module?

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How to test the GM ignition control module?

You can find this tutorial in Spanish here: Cómo Probar El Módulo de Encendido GM 4.3L, 5.0L, 5.7L (1995-2005) (at: autotecnico-online.com ). Generally, when the ICM or the ignition coil fails, your GM car or truck will Crank but NOT START.

How does the crankshaft position sensor work on a GM car?

The crankshaft position (CKP) sensor starts to create its Crank Signal, which it sends to the PCM. The crankshaft position sensor is a Hall Effect type sensor and produces a digital (On/Off) signal that can be seen with an LED or an oscilloscope.

How does the crank sensor work on the ignition module?

When the engine starts to crank, the crankshaft position sensor starts to produce and send its signal to the ignition control module (ICM). The ignition control module upon receiving this AC Volts crank signal, converts it into a DC digital signal and sends it to the ECM.

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How to test the crankshaft position sensor ( GM )?

Since this crankshaft position sensor test article covers quite a few GM years, makes and models, take a look at the ‘Applies To:’ box on the right and scroll with the ‘Next > >’ button to see all of the applications.

What happens when a crankshaft sensor goes bad?

If you have crankshaft sensor issues, the (ECM) can’t synchronize fuel injection, spark ignition or control variable valve timing. Let’s learn about some crankshaft position sensor (CKP) failure symptoms so that you can take action when there’s a problem.

What is the crank sensor on a GM 3.1L engine?

This article will help you test the ignition control module (ICM) and 3X crankshaft position sensor on all of the GM 3.1L and 3.4L overhead valve engines (the 3X crank sensor is also known as the 7X Crank Sensor).

How is the crank sensor connected to the ICM?

The crank sensor is fed with power and Ground. The crank sensor is a Hall-Effect type sensor. The crankshaft rotation induces the crank sensor to start creating two separate crank signals. One crank signal is called the CKP (crankshaft position) signal. The CKP signal is only sent to the ICM.

Where are the coils on a Chrysler ignition?

The PCM identifies camshaft position by registering the change from 5 to 0 volts or 0 to 5 volts, as signaled by the cam sensor. In Chrysler’s coil-on-plug ignitions, there’s one coil for each cylinder, and it’s attached to the engine directly above the spark plug.

What happens when the crankshaft position sensor goes bad?

If the computer detects a problem with the crankshaft position sensor’s signal, it will activate the Check Engine Light to alert the driver of the problem. A Check Engine Light can also be set off by a wide variety of other issues. Having the computer scanned for trouble codes is highly recommended. 4. Uneven Acceleration

Can a bad crankshaft sensor cause a cylinder to misfire?

Should you feel or hear a brief stutter in the engine, it may be a sign of misfiring cylinders from a bad crankshaft position sensor. A failing crankshaft position sensor cannot provide the right information about piston positioning in the engine, causing a cylinder to misfire.

Do you need a crank signal to start a Chrysler engine?

For a Chrysler engine to start, the PCM must receive a good signal from both the CKP and CMP sensors. Once the engine is running, the cam signal is no longer needed for operation on vehicles built after 1996. However, the PCM needs the crank signal to diagnose a potential problem with the cam signal, and vice versa.

Since the ICM isn’t cheap and replacing the crank sensor is labor intensive (you’ve got to remove the timing belt), testing the ICM and crank sensor, on your 2.3L Ford Ranger or Mustang (or B2300), becomes a must! For your cross reference information, the ignition control module test that this article covers are:

How big is the engine in a Ford Ranger?

Ford Ranger 2.8L V6 Engines Crank Pulley Bolts 85-96 ft-lbs Flywheel to Crankshaft Bolts 47-52 ft-lbs Intake Manifold 15-18 ft-lbs [5-steps (hand start & snug Exhaust Manifold 20-30 ft-lbs

What is the wiring diagram for a Ford Ranger?

Wiring Diagram: The following wiring diagram may be of help: 1992-1994 2.3L Ford Ranger Ignition System Wiring Diagram. * Your specific Ford vehicle may have different colors. * Your specific Ford vehicle may have different colors.

Where are the spark plugs located in the crank sensor?

During engine cranking, only the Right side spark plugs (exhaust manifold side of the engine) are fired. Once the engine starts, the PCM now commands the ICM to fire both coil packs through the Dual Plug Inhibit (DPI) circuit (circuit 6 of the ICM Top Connector), . Each coil pack feeds spark to 4 spark plugs on either side of the engine.

How does the ignition module work on a Ford 2.3L?

* Your specific Ford vehicle may have different colors. The ignition module is tasked with activating the two ignition coil packs that feed the 8 spark plugs that the 2.3L 4 cylinder engine is equipped with. Now, I won’t go into minute technical detail as to how everything works in this ignition system.

What does an ECM do on a Ford Ranger?

Your ECM for Ford Ranger controls numerous, essential systems in your truck. Reduced emissions, ideal fuel mixture, easy ignition and variable cam timing all rely on a properly functioning ECM. The Ranger engine control computer is designed to work seamlessly with your truck’s sensors for maximum efficiency and performance.

What kind of ignition system does Ford 4.0L have?

The ignition system of the Ford 4.0L equipped vehicles covered by this article use a distributor-less ignition system. More specifically, it uses a coil pack type ignition system. No power to the ignition coil pack.

Where is the crankshaft sensor on an Olds intrigue?

This crankshaft position sensor belongs to a 98 Olds Intrigue. This sensor is located behind the crankshaft pulley. C ran k shaft P osition (CKP) sensors and C a m shaft P ositions (CMP) sensors used on cars and trucks today come in all sorts of different shapes, sizes and configurations.

What kind of sensor does a Ciera engine use?

The engine in the Ciera uses two crankshaft position sensors: a low-speed sensor, called 24X, and a starting/high speed sensor, called 7X.

What is the crank sensor signal on an ICM?

The crank sensor signal is an On/Off type of signal that can be measured with a multimeter or an LED Light. The crank sensor signal is also called the ‘triggering signal’ in this article. As soon as the ICM gets the crank sensor signal, it starts activating the ignition coils sitting atop of it.

The engine in the Ciera uses two crankshaft position sensors: a low-speed sensor, called 24X, and a starting/high speed sensor, called 7X.

What does the crank sensor on a GM 3.8L do?

As the engine cranks, the ignition module receives the crank sensor signal. The crank sensor signal is an On/Off type of signal that can be measured with a multimeter or an LED Light.

How to test the ignition module and crank sensor?