How would i test the cmp to know if it's good or bad
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2000 Dodge Grand Caravan Question: testing the cmp
Answer #1Bret Bodas from RepairPal Test Shop, October 23, 2009, 10:49Master
The most reliable test is with an oscilloscope. Much like a doctor would monitor your heart on an EKG machine, technicians monitor signals from engine sensors with a similar machine (oscilloscope).
You can check the resistance with an ohm meter if you have a specification for the sensor, but this will very rarely uncover a bad sensor.