Knock sensor

Tiny
JOHN59108840
  • MEMBER
  • 2005 CHRYSLER 300
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 164,400 MILES
Im try 2 locate my knock sensor on my car because it has my check engine light on. I cant find it. I want an try 2 change it. Could u tell me where would it be located at on my car. The mechanics said its in the second sensor.. I need help locating it so I could change it.
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Thursday, October 9th, 2014 AT 8:34 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 107,922 POSTS
There are two. Both are located in the same spot on either side of the engine below the exhaust manifolds. I would assume #2 is for bank 2 (Even numbers) See diagrams below for location and cylinder ID numbers
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Thursday, October 16th, 2014 AT 7:29 PM
Tiny
LUIS LOZANO
  • MEMBER
  • 1 POST
  • 2002 CHRYSLER 300
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 100 MILES
Describe the type sensor of the Knock sensor is on this vehicle and how it should be tested?
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Monday, March 25th, 2019 AT 12:14 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Car Knock Sensor

The Knock Sensor detects engine knock and sends a voltage signal to the ECM. The ECM uses the Knock Sensor signal to control timing. Engine knock occurs within a specific frequency range. The knock sensor, located in the engine block, cylinder head, or intake manifold is tuned to detect that frequency.
The knock sensor senses when fuel is burning unevenly and causing “knocking” or irregular vibrations in the engine. It consists of an electric coil that is wound around two ceramic rods with a magnet in the center. The vibration of the engine causes the rods to vibrate. This disturbs the coil’s magnetic field and alters the current passing through the coil. This disturbance returns to the computer as a signal pattern that the computer analyzes. The computer then determines whether the vibrations are characteristic of engine knocking.

There are special sensor testing machines, but 99% of the time if the code come up with a fault it will be faulty, fit a new one.

Usually one would use a scan tool to watch knock signal while tapping on the engine with a metal object to see if it picks it up

SYMPTOM
P0325-KNOCK SENSOR #1 CIRCUIT

WHEN MONITORED
With the ignition ON and the engine running.

SET CONDITION
The Knock Sensor circuit voltage falls below a minimum value at idle or deceleration. The minimum value is from a look-up table internal to the PCM and is based on engine rpm. DTC also sets if sensor output goes above 5.0 volts. One Trip Fault.

POSSIBLE CAUSES
- Intermittent condition
- Knock sensor signal circuit shorted to voltage
- Knock sensor signal circuit shorted to ground
- Knock sensor signal circuit open
- Knock sensor signal circuit shorted to knock sensor return circuit
- Knock sensor return circuit open
- Knock sensor

mark (mhpautos)

Read the guide below on using a meter, it will help

https://www.2carpros.com/articles/how-to-use-a-voltmeter

See the attachments below for troubleshooting
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Monday, March 25th, 2019 AT 12:14 PM (Merged)

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