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The camshaft place sensor in your Altima"s distributor is the one the controls the ignition system and if the goes bad, her Nissan Altima won"t start. Although it"s referred to as a camshaft place sensor, it"s real function is the of a crankshaft position sensor.

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As you might currently know, the camshaft place sensor is situated inside the distributor assembly on your 1997, 1998, 1999, 2000, or 2001 2.4L Nissan Altima, and this write-up will present you just how to check it with a multimeter in Volts DC mode because a basic resistance test of the camshaft place sensor does not exist.

You"re likewise not walk to need a scan tool or any type of other high-quality diagnostic tool, simply a multimeter and also a helper come crank the engine for you.


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friend can discover this tutorial in Spanish here: Cómo Probar El Sensor De La Posición Del Árbol De Levas (1997-2001 2.4L Nissan Altima) (at: autotecnico-online.com).

Important Tips and Suggestions

TIP 1: The only way to effectively and also accurately check the camshaft position sensor, is through manually rotating the engine. You have to not crank the engine v the starter motor to perform this camshaft position sensor test.


TIP 2: You need to disable the fuel system by disconnecting all 4 fuel injectors before starting the test.

TIP 3: It"s crucial that you test for spark first, before attempting the camshaft position sensor test. If you have actually spark coming from any kind of one the the 4 spark plug wires, climate you can accurately i think the camshaft position sensor is OK.Here"s the attach to the ignition coil test: 2.4L Nissan Ignition Coil test (97-01), i m sorry you must do an initial before trial and error the camshaft place sensor.

TIP 4: The camshaft place sensor is component of the strength transistor assembly and is inside the distributor. If the camshaft place sensor proves to it is in fried, you"ll need to replace the whole distributor, due to the fact that it"s not sold separately.

How walk The Camshaft place Sensor Work?

What"s gonna" aid you to watch the ‘why and also how’ of the experimentation in this short article is to understand just how the power transistor works. In a nutshell, this is what happens:


The camshaft position sensor is situated inside the distributor and is component of the strength transistor assembly.


The camshaft place sensor assembly is really a crank sensor, since the fuel injection computer system uses it to control the creation of spark thru" the strength transistor and ignition coil.


Now, once you rotate the vital and crank the engine (to begin it), the camshaft place sensor/power transistor obtain power thru" the wire labeled v the number 5 (see photo over of the connector).


As the engine turns, the camshaft place sensor assembly beginning to create two certain position signals the it sends directly to the computer. One signal is dubbed the 1° POS Signal and the various other is referred to as the 180° REF Signal


When the power transistor gets the Triggering signal indigenous the fuel injection computer, it currently starts to switch the ignition coil"s strength On and also Off. This ON/OFF action is what provides the ignition coil spark and also is referred to as the switching Signal.


If any one that the two camshaft place sensor signals is missing, her Nissan Altima will certainly crank however not start due to a absence of spark.

CAM SENSOR check 1: Making sure The Camshaft position Sensor Is obtaining Power

The first order of organization is come check and verify the the camshaft position sensor is gaining juice, in the type of 12 Volts.


The wire the delivers this 12 Volts come the distributor is the wire labeled v the number 5 in the photograph above.

Alright, these space the test steps:


CASE 1: The multimeter registered 10 come 12 Volts. This is the correct test result and confirms that the camshaft position sensor is getting power.

The next step is to examine that the camshaft position sensor is producing its two place signals. Walk to: cam SENSOR check 2: check The 1° POS Signal.

CASE 2: The multimeter DID not register 10 come 12 Volts. This tells you that the cause of your Nissan Altima"s no start is because of this missing voltage, due to the fact that without this voltage, the distributor is no gonna" work.

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Although it"s beyond the scope of this article to troubleshoot this lacking voltage, recognize the reason of these absent 12 Volts will resolve you no-spark no-start problem on your 2.4L Nissan Altima.