I just had to troubleshoot and error code 52 on my truck and found the following information I thought I would share. The knock sensor can be tested by using a digital multi meter like a fluke 83 (cheaper models do not detect the knock sensor signal). Put the meter on AC voltage with autoranging. Put the negative lead of the meter on the engine block or a good metal ground on the engine and put the positive lead on the knock sensor contact. By tapping on the block lightly with a socket extension you will see a voltage detection and in the case of the Fluke 83 there is a bar graph indictation as well. If you want to check the sensor and wire without taking the intake off first, the pigtail connector is located next to the middle fuel injector connector on the driver's side of the engine, it has two contacts, one is the center conductor to the sensor, the other one is to the noise shield and won't have a signal on it. In my case it turned out that the knock sensor pigtail wire had opened, the $13.00 dollar wire from the dealer was a lot easier to take than the Knock sensor at $175.00 from the dealer or around $145.00 for a Borg Warner model from Checker auto.
- posted
17 years ago