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Ignition Knock (Detonation) Sensor location

Tiny
KMART120
  • MEMBER
  • 2008 SATURN AURA
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Hello, I got a check engine light in my car so I plugged in my code scanner and it came back with the code P0325 so I bought a Ignition Knock (Detonation) Sensor from the auto parts store. I am trying to find out where exactly it's located on my car engine so I can replace it. Can anyone help please?
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Thursday, November 12th, 2020 AT 9:11 AM

15 Replies

Tiny
KASEKENNY
  • MECHANIC
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Clearly the sensor would be the common cause but if this is not it, let us know and we can get further in to the diagnosis.

Here is the process for replacing it. Thanks
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Thursday, November 12th, 2020 AT 10:03 AM
Tiny
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Thank you for the images they were helpful. I'll reply back if all goes well.
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Friday, November 13th, 2020 AT 3:17 PM
Tiny
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Great. Thanks for the update. Please let us know what happens. Thanks
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Friday, November 13th, 2020 AT 5:10 PM
Tiny
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The sensor was replaced and it ran fine for a few hours then the same code appeared again. To clarify, it's not the only the check engine light that appears on my car. The car throws out an 'engine reduced power' and the 'service traction control' message. When I plug in the computer I get the P0325 - Knock/combustion vibration sensor A circuit and a P1682 - Driver 5 Line 2. I replaced the knock sensor, I changed my spark plugs, I changed both intake/exhaust VVT camshaft solenoid sensors. I'm a little bit lost?
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Sunday, November 15th, 2020 AT 5:48 AM
Tiny
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An update: The check engine light appears, the car gives a reduced power and service traction control message but the P0325 code is gone. The only code that displays now on the code scanner is P1682 - Driver 5 Line 2. Any thoughts?
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Sunday, November 15th, 2020 AT 9:46 AM
Tiny
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I am attaching the testing info on this code. It is basically telling you that there is a circuit issue. Either it is a wiring issue, ECM issue, or a possible relay issue.

P1682 - Ignition 1 switch circuit 2

Let's go through this info and let me know what questions you have. I understand the confusion but this code is going to cause the reduced power so I suspect if we fix this then it will cure the issue.
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Sunday, November 15th, 2020 AT 3:54 PM
Tiny
KMART120
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  • 9 POSTS
Okay, thank you. At least its narrowed down. I have a ancel 410 scanning tool so what should I look for first. Also, I noticed the notes on screenshot 5 show that the voltage is passed through the circuit by a fuse. Is it as simple as checking if a fuse has gone bad and if that's the case, is there a way to tell which fuse it is?
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Sunday, November 15th, 2020 AT 7:02 PM
Tiny
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I am not sure that scan tool has the ability to monitor the needed info. Take a look at the wiring diagram which I highlighted the circuit that is involved.

Then on the second screen shot is the testing that we need to do. Basically it is asking to make sure the circuit is not open so a blown fuse would make sense. The underhood fuse block, Fuse 16 is what we need to check.
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Monday, November 16th, 2020 AT 7:24 PM
Tiny
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Okay I understand. I went ahead, opened the hood, the fuse box and I checked fuse 16 based on the diagram, on the car and it looks fine.
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Tuesday, November 17th, 2020 AT 8:04 AM
Tiny
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Okay. Then follow that wire that is highlighted and go to the ECM and check power to see if you have 12 volts at the ECM. If not, we have a wiring issue or some other issue preventing voltage to get to the ECM like the relay.
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Tuesday, November 17th, 2020 AT 6:16 PM
Tiny
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Okay, I'll check it out.
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Thursday, November 19th, 2020 AT 6:47 PM
Tiny
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Is there a tool that you would recommend that I buy, that could help me out with checking the voltage? Because I only have the ancel ad410.
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Friday, November 20th, 2020 AT 7:27 AM
Tiny
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Yes. You will need to use a multimeter so that you can see the voltage.

Here is a guide that will help with the use of one:

https://www.2carpros.com/articles/how-to-use-a-voltmeter
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Friday, November 20th, 2020 AT 5:53 PM
Tiny
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It took me awhile to have all those things checked out. I took it to a mechanic, I told him everything and he examined it. After checking it, the wire connections are fine, connections to the ECM are fine but according to his machine it appears that the BCM at certain points in time fails to communicate to other parts in the car and that's what's causing the car to go into 'limp' mode. The BCM was replaced in that car from another Saturn of the same model but after we put it in, the odometer stopped counting miles and froze into place so I wasn't sure if it needed to be programmed, but that was last year. So he told me to scrap it and get a new car given that they don't make parts for that car anymore. What's your advice?
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Wednesday, December 9th, 2020 AT 6:44 AM
Tiny
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Unfortunately the BCM cannot be reprogrammed to another vehicle. The reason the mileage stopped counting is because it is mismatching the original. You are not able to swap these parts. Take a look at the attachment that explains this.

Unfortunately your options are locating a company that will repair your original BCM for the issue that it has. There are many companies out there that do this sort of thing but I am not sure if they will do this specific module. Also, you may be able to find someone that sells a used module that is blank and so you are able to program it to this vehicle.

Let me know if that makes sense. Thanks
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Thursday, December 10th, 2020 AT 6:16 PM

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