If you doubt that the crankshaft position sensor is causing your 1.8L Nissan Sentra to not start, climate this tutorial will assist you come diagnose it using just a multimeter.

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This multimeter test is a very accurate check that"ll tell you if the crankshaft place sensor is negative or not.

NOTE: If you have to test the camshaft place sensor, inspect out this tutorial: exactly how To test The Camshaft place Sensor (2000-2002 1.8L Nissan Sentra).

Symptoms of A Defective Crankshaft position Sensor

Here is a straightforward list the the symptoms you are going to see once the crankshaft position sensor falls short on her 2000, 2001, or 2002 1.8L Nissan Sentra.

A trouble password P0340: Crankshaft position Sensor A Circuit lighting increase the check engine light.Car cranks yet does not start.The fuel injection computer system does no activate the fuel injectors (this is proved with a Noid irradiate test).The fuel injection computer system does no activate the ignition coils (this is showed with a spark tester).The fuel pump activates and also sends the correct fuel press to the fuel injectors (this is verified with a fuel pressure gauge).

Circuit explanation Of The Crankshaft place Sensor

The crankshaft position sensor is situated behind the engine. To be a bit more specific: it"s located right underneath the starter motor.

To be able to get accessibility to it"s electric connector, you have to remove the mass air flow sensor and also intake air water tap assembly.

Once you acquire to the crankshaft place sensor connector, you"ll notification that it has actually 3 wires sticking the end of it. Every wire has actually a specific job come do and also in the table below you"ll find a brief description the each:

Crank position Sensor (2000, 2001, 2002 1.8L Nissan Sentra)TerminalWireDescription
2REDCrankshaft place Signal
3WHTPower -12 Volts

Where to Buy The Crankshaft position Sensor

You can buy the crankshaft place sensor at your regional auto parts store or if you"re favor me and also need to save money on any type of kind that purchase, you can buy it online.

The Hitachi CPS0001 Crankshaft place Sensor listed below is the initial factory part for the 2000-2002 1.8L Nissan Sentra.

You can inspect it out here:

TEST 1: checking The Crankshaft place Signal through A Multimeter

The very an initial thing we"re going to do is make certain that the crankshaft place sensor is creating a signal. Now to gain into specifics, the crankshaft place sensor create an ON/OFF voltage that you and also I deserve to measure through a multimeter in Volts DC.

When the sensor is "ON" that generates a voltage in between 9 to 10 Volts DC. As soon as the sensor is "OFF", the voltage drops come 0 Volts DC.

The most typical thing the I have actually seen, once the crank sensor fails, is the it will remain stuck developing only 9 to 10 Volts without ever dropping down to zero Volts (as the engine is manually turned from the crankshaft pulley).

So, in this test section we"re gonna" connect a multimeter come the red cable of the crank sensor connector and then manually revolve the engine and see if the sensor is great or not.

OK, let"s obtain started:


Raise the prior passenger next of her Sentra onto a jack stand (for safety).Remove the front passenger next wheel and remove the plastic water splash security (shield) the protects the crankshaft pulley and serpentine belt native water.


Disconnect the crank sensor indigenous its electric connector. As a security precaution, disconnect every one of the ignition coils from their electric connectors.NOTE: to gain accessibility to the crank sensor connector, eliminate the waiting filter assembly and also intake air duct assembly (it"s less complicated to gain to the from the peak of the engine 보다 from underneath).


Connect the connector ago to the crankshaft position sensor. The crankshaft position sensor need to be associated to its electric connector for this test to work.


Set your multimeter come Volts DC mode and also Connect the black color multimeter test lead straight to the battery an adverse (-) terminal.


Slowly turn the crankshaft wheel by hand in a clock-wise direction when you store you eyes on the multimeter once you have the multimeter set up. Execute not usage the starter motor to crank the engine and also I desire to emphasize slowly transforming the crank pulley.


If the crank sensor is functioning correctly, the multimeter will certainly register one On/Off voltage the 9-10 and 0 Volts DC together you manually revolve the crankshaft. Turn off is once the multimeter display screens 9.5 - 10 Volts DC and also On is 0 Volts DC.To be a little an ext specific: your multimeter will certainly register 9 come 10 Volts many of the time you"re transforming the crank pulley. When the crank sensor is set off (and if it"s working correctly) by the pole piece on the crankshaft, then this voltage will certainly go under to 0 Volts.

Let"s take a look at what her test results mean:

CASE 1: The multimeter registered 9.5 come 10 Volts DC and the 0 Volt pulse as you manually turned the crankshaft pulley. This is the correct and also expected test result and shows that the crankshaft position sensor is functioning fine.

CASE 2: The multimeter DID not register the On/Off 9.5 come 10 Volts DC and also 0 Volts pulse as you manually rotate the crankshaft pulley. This result indicates that the crankshaft position sensor is not creating a signal.

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Before we condemn the sensor together defective, we have to make sure it"s getting power and also Ground. For the next test, go to: test 2: Making sure The Crank Sensor Is getting Power.