How To Test a Mitsubishi Eclipse Knock Sensor

How To Test a Mitsubishi Eclipse Knock Sensor

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When you are having a problem with your Mitsubishi Eclipse knock sensor, you can use our handy How To Guide to test it. The role of this sensor in your engine bay is to act like your ECU’s “ears” and listen for pre-detonation. Detonation in you combustion cylinder indicates a lean condition or a problem with your engine.

Your Mitsubishi Eclipse Knock Sensor is responsible for monitoring your engine conditions. When you are having a problem with your knock sensor, your Mitsubishi Eclipse won’t be able to properly monitor for engine knock.

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Today I’ll be showing you how to test the knock sensor in a 2002 Mitsubishi Eclipse GS. This vehicle comes with the 2.4 liter SOHC engine and we’ll be using a multimeter to test the sensor. You will be using the multimeter to test the internal resistance of your knock sensor to determine if it’s gone bad.

Not sure what a multimeter is? Check out our handy guide here. To begin our DIY knock sensor testing guide, make sure your car is cold and your engine bay is not hot. Do not try to test your Eclipse knock sensor when your engine is hot, as the sensor is located above your rear water pipe.

How To Test your Mitsubishi Eclipse Knock Sensor

This sensor is located on the back of your engine, and it’s screwed into your shortblock above the rear water pipe. The aftermarket part number for this knock sensor is SU7232, and it’s a two pin weatherproof connector.

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To begin the testing procedure, you must locate the two pin connector and unplug it. The wire you will be testing is the BLACK wire with a white stripe. You will be testing for resistance between this pin on the sensor side and your vehicle ground.

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Get your multimeter and turn the knob to test for continuity and unplug your Mitsubishi Eclipse Knock Sensor. You will be testing PIN A to determine whether or not your sensor is any good.

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You will be checking this pin for continuity and your engine ground. There should be less than 2 ohm Ω worth of resistance present at this pin. If you see an OPEN condition in this sensor, you must inspect the wiring for any signs of damage.

Check your Mitsubishi Eclipse Knock Sensor wiring for any frayed wires. If there’s a short or open wire, repair it to restore the proper operation of your sensor.

If there doesn’t appear to be any damage, go ahead and remove the knock sensor with a deep 21mm socket. The pitch thread for this knock sensor is M10 X 1.25. Once you’ve replaced the knock sensor you can reset your ECU or use a scan tool to clear your OBDII trouble code.

Have any questions about our Mitsubishi Eclipse Knock Sensor testing guide? Leave us a comment below and let us know!!

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