TEST 3: Verifying The Crank Sensor Is Creating A Crankshaft Position Signal
OK, this is the final test (and the one you signed up for). In this test step, we're gonna' verify that the crank sensor is actually creating a crankshaft position signal.
The one thing you need to keep in mind, to get an accurate test result, is to manually turn the engine using a socket and ratchet wrench (on the crankshaft pulley).
In case you're wondering: ‘Why turn the engine over by hand?’ This is to ensure that you get a very accurate test result.
These are the steps:
Disable all of the ignition coils by disconnecting them from their electrical connectors... this is important!
Place your multimeter in Volts DC mode.
IMPORTANT: The crank sensor must be connected to its engine wiring harness connector for this test!
Connect the red multimeter test lead to the BLU wire with an appropriate tool. The BLU wire connects to the connector terminal identified with the number 2 in the illustration.
You should use a back-probe or a wire-piercing tool to attach to your multimeter to check for this crankshaft position signal (Wire Piercing Probe).
Connect the multimeter's black lead directly on the battery's negative terminal or a good ground point on the engine.
Turn the key to the On Position but don't crank the engine. This will power up the crank sensor.
With an appropriate tool, turn the crankshaft pulley by hand. Do not crank the engine with the key from inside of the vehicle.
If the crank sensor is functioning correctly, your multimeter will register an On/Off voltage signal as you crank the engine by hand. ‘On’ will register 5 Volts on the multimeter and ‘Off’ will register 0.1 Volts.
Let's find out what your test results mean:
CASE 1: If the multimeter registered the On/Off voltage values the whole time you hand cranked the engine: Then the crankshaft position sensor is working and is not the cause of your Galant's ‘no spark no start’ condition.
CASE 2: If the multimeter DID NOT register the On/Off voltage values then the crankshaft position sensor is BAD and needs to be replaced.
To explain this a bit further: You have:
- Checked/confirmed that the crankshaft position sensor is being fed power on the RED wire (TEST 1).
- Checked/confirmed that the crankshaft position sensor is being fed ground on the BLK wire (TEST 2).
- In this test step you confirmed that the sensor is not creating the On/Off voltage signal (On= 5 Volts, Off= .1 Volts).
Taking these 3 specific test results into account, you can conclude the crankshaft position sensor on your 2.4L Mitsubishi Galant is bad.
Where To Buy the Crank Sensor And Save
The following links will help you comparison shop for the crankshaft position sensor.
Not sure if the above crankshaft position sensor fits your particular Galant? Don't worry, once you get to the site, they'll make sure it fits. If it doesn't fit, they'll find you the right one.
More 2.4L Mitsubishi Tutorials
You can find a complete list of 2.4L Mitsubishi tutorials here: Mitsubishi 2.4L Index of Articles.
Here's a small sample of the tutorials you'll find in the index:
- How To Test The Fuel Injectors (2.4L Mitsubishi).
- How To Test The Throttle Position Sensor (2.4L Mitsubishi).
- How To Test The Engine Compression (Mitsubishi 1.8L, 2.4L).
- Testing A BAD Alternator: Symptoms And Diagnosis.
- How To Bench Test The Starter Motor.
- Blown Head Gasket Test (Mitsubishi 1.8L, 2.4L).
If this info really saved the day, buy me a beer!