If you suspect that the crankshaft place sensor is resulting in your 1.8L Nissan Sentra to no start, climate this tutorial will assist you to diagnose the using only a multimeter.

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

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

Symptoms the A Defective Crankshaft place Sensor

Here is a an easy list of the symptoms you are going to see as soon as the crankshaft place sensor fails on her 2000, 2001, or 2002 1.8L Nissan Sentra.

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

Circuit descriptions Of The Crankshaft place Sensor

The crankshaft place sensor is located behind the engine. To it is in a bit an ext specific: it"s located right underneath the starter motor.

To be able to get access to it"s electric connector, you must remove the mass air flow sensor and intake air hose assembly.

Once you acquire to the crankshaft position sensor connector, you"ll an alert that it has 3 wires sticking out of it. Every wire has a particular job come do and in the table below you"ll uncover a brief description of each:

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

Where come Buy The Crankshaft place Sensor

You deserve to buy the crankshaft position sensor at your regional auto components store or if you"re prefer me and need to save money on any type of kind that purchase, you have the right to buy that online.

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

You can check it the end here:

TEST 1: check The Crankshaft position Signal v A Multimeter

The very an initial thing we"re walking to carry out is make certain that the crankshaft position sensor is developing a signal. Currently to gain into specifics, the crankshaft place sensor creates an ON/OFF voltage that you and I deserve to measure v a multimeter in Volts DC.

When the sensor is "ON" it generates a voltage in between 9 to 10 Volts DC. Once the sensor is "OFF", the voltage drops come 0 Volts DC.

The most typical thing that I have seen, when 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 wire of the crank sensor connector and also then manually rotate the engine and also see if the sensor is great or not.

OK, let"s get started:


Raise the prior passenger next of your Sentra top top a jack was standing (for safety).Remove the prior passenger side wheel and remove the plastic water splash guard (shield) that protects the crankshaft pulley and serpentine belt native water.


Disconnect the crank sensor native its electric connector. Together a safety precaution, disconnect every one of the ignition coils indigenous their electric connectors.NOTE: to gain accessibility to the crank sensor connector, eliminate the air filter assembly and also intake wait duct assembly (it"s easier to gain to that from the height of the engine 보다 from underneath).


Connect the connector back to the crankshaft position sensor. The crankshaft position sensor need to be linked to its electrical connector for this check to work.


Set her multimeter come Volts DC mode and also Connect the black color multimeter check lead directly to the battery an adverse (-) terminal.


Slowly rotate the crankshaft pulley-block by hand in a clock-wise direction if you store you eyes on the multimeter as soon as you have the multimeter set up. Carry out not usage the starter motor to crank the engine and also I desire to emphasize slowly turning the crank pulley.


If the crank sensor is working correctly, the multimeter will certainly register one On/Off voltage the 9-10 and 0 Volts DC as you manually rotate the crankshaft. Turn off is once the multimeter displays 9.5 - 10 Volts DC and also On is 0 Volts DC.To be a little an ext specific: her multimeter will register 9 to 10 Volts many of the moment you"re turning the crank pulley. Once the crank sensor is caused (and if it"s functioning correctly) by the pole item on the crankshaft, then this voltage will go under to 0 Volts.

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

CASE 1: The multimeter registered 9.5 to 10 Volts DC and the 0 Volt pulse as you manually rotate 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 to 10 Volts DC and also 0 Volts pulse together you manually rotate the crankshaft pulley. This an outcome indicates that the crankshaft place sensor is not developing a signal.

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