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Knock sensor circuit problem

Check engine comes on for two to three days after code has been cleared

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Well, you have another issue besides a knock sensor problem. A knock sensor code WILL NOT illuminate the check engine light. Check for other codes stored in the ECU. I have seen oxygen sensor issues cause knock sensor issues due to inaccurate fuel delivery resulting in engine ping at all times (causing the ECU to think that the knock sensor is bad because it's reporting ping at all times) - but also had codes for one or more O2 sensors.

Nissan Scope Technician- 10 years with Nissan

Posted on Oct 29, 2008

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Ok had the codes come up for both crank sensors on our Pontiac Montana and knock sensor, replaced all three sensors cleared codes and the check engine light keeps coming back on after clearing codes, for...


I guess you do not know that OBD Codes have
nothing to do with replacing parts

The Codes are used along with the diagnostic
info & charts to check the system that set the codes

Only component testing will find a problem

You used the name of a codes to replace a part
with a similar name

I would guess you did no testing & have no idea why the
fault codes were set, so you found no problem, thus you
fixed nothing & the MIL Lamp is still on

You Cleared ALL DATA needed to help diagnose the issues

You lost your codes & freeze frame data at the time the codes
were set & your lost your emission monitor data

Now you get your codes & write them down
Google the codes & study the possible cause
& solutions

TYPE: OBD & your codes

Need to study OBD Vehicle Systems

Oct 16, 2014 | Cars & Trucks

1 Answer

Mass air flow and knock sensor


SOMETHING WRONG WITH THE HIGH VOLTAGE COILS AT PLUGS,DID HAD A SIMILAR PROBLEM ON MY 2002 KIA MAGENTIS!

Mar 25, 2014 | 2003 Kia Rio

1 Answer

P0325


DTC P0325 - Knock Sensor Circuit Malfunction
A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330.

This diagnostic DTC is used to check the PCM and its Knock Sensor (KS) module. The PCM has stored a calibrated time that it considers to be a valid spark knock duration. If the PCM sees a knock event that was longer in duration than the acceptable time, the PCM sets DTC P0325.

CONDITIONS FOR SETTING THE DTC
Test Conditions
- Test continuously.
- Ignition voltage 11 volts or more.

Failure Condition: The knock sensor reports a knock event longer than 99.99 milliseconds for 3 seconds continuously.

ACTION TAKEN WHEN THE DTC SETS
- Ignition control uses the 87 octane spark advance.
- The PCM will illuminate the Malfunction Indicator Lamp (MIL) after two consecutive drive trips that the diagnostic runs and fails.
- The PCM will record operating conditions at the time the DTC sets. This information will be stored in the Freeze Frame and Failure Records.
- A first failure of this DTC will store in Last Test Failed but not History.

CONDITIONS FOR CLEARING THE MIL/DTC
- The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
- A Last Test Failed DTC will clear when the diagnostic runs and does not fail.
- A History DTC will clear after forty consecutive warm-up cycles with no failures of any diagnostic test.
- PCM battery voltage is interrupted.
- Using a Scan tool.


You are positive you are not hearing any spark knock, ping, engine noise etc... if not than yes, the sensor is the most common by % of times. Check THIS LINK.

Removal Procedure
Remove the intake manifold. Refer to Engine / Intake Manifold / Service and Repair.
Disconnect the knock sensor electrical connector.
Remove the knock sensor.

Installation Procedure
Install the knock sensor. Tighten the knock sensor to 19 Nm (14 lb ft).
Connect the knock sensor electrical connector.
Reinstall the intake manifold.


hope this helps.

Jul 26, 2011 | 1997 Ford F350 Crew Cab

3 Answers

Diagnostic code po325 what does this mean


Hi the error code relates to the PCM Knock Sensor Circuit

A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. The knock sensor generally threads into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly.
Symptoms

You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.
Causes

A code P0325 most likely means one or more of the following has happened:

* The knock sensor is faulty and needs to be replaced
* There is a wiring short/fault in the knock sensor circuit

Possible Solutions

* Check the resistance of the knock sensor (compare it to factory specs)
* Check for broken/frayed wires leading to the sensor
* Replace the knock sensor

Hope this helps
Steve

Mar 03, 2011 | 1993 Jeep Grand Cherokee

1 Answer

I have a 2004 pilot, VTS4 and engine light came on. i have a p0325 knock sensor circ. bank A. just replace the sensor?? also i can seem to find any diagrams. any help appreciated!!!


It does sound like the sensor may be bad, but you also need to check the wiring.
This information comes from:

http://www.obd-codes.com/p0325

P0325 OBD-II Trouble Code Technical Description

Knock Sensor Circuit Malfunction
What does that mean?

A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms

You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.
Causes

A code P0325 most likely means one or more of the following has happened:

Possible Solutions
  • Check the resistance of the knock sensor (compare it to factory specs)
  • Check for broken/frayed wires leading to the sensor
  • Replace the knock sensor

Mar 02, 2011 | Honda Pilot Cars & Trucks

1 Answer

I have an engine code PO332 knock sensor 2 circuit low imput bank 2 what is this problem .the car is a 2001 gmc yukon xl .


The most likely cause of your code is a bad rear knock sensor. You should check the knock sensor wiring harness for corrosion. But if that checks out the sensor will have to be replaced. The knock sensor is under the intake manifold, although it's not too difficult to remove. Both knock sensors should be replaced along with the wiring harness, just because of labor involved in gaining access to the sensors. You could try clearing the code, it may stay off for a long time.

May 23, 2010 | 2001 GMC Yukon XL

2 Answers

Service engine light


Your not going to here any knock from the engine the knock sensor detects detonation which is not detectable with the human ear. if you want to test the knock sensor you can tap the side of the block the engine should stumble for a couple of seconds if it does not change then the way the engine runs then the knock sensor is defective or hase buildup iside the engine and you will need to do a top engine clean. if you want instructions on how to do this just post another post to this reply This happens on engines that ave high mileage or acar that runs low grade like regular.

Apr 16, 2010 | 2004 Mini Cooper

1 Answer

98 Nissan Maxima - Check Engine Light, Knock Sensor


If the car is pinging you will set a knock sensor code.'
This comes from bad gas and running lean., You really need this professionally inspected to rule out the basics. I have seen alot of nissans with the knock sensor code stored but the light is still off.
Fill up the tank with high octane chevron and some techron injector cleaner and clear the light. If it stays off for a couple days then go get it inspected. Even if the code is stored it will still pass as long as the light is still off and the monitors have run.

Jan 04, 2010 | 1998 Nissan Maxima

2 Answers

Check engine light on. P0325, P0420 2000 Subaru


CODE PO420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK I * CODE PO325 KNOCK SENSOR NO.1 CIRCUIT MALFUNCTION BANK NO.1 OR SINGLE SENSOR

Nov 13, 2009 | 2000 Subaru Outback

2 Answers

Knock sensor circuit


The code means there is a problem in the knock sensor circuit, that means the the knock sensor connector wire pins may have a problem, the wiring to the sensor may be damaged, or the PCM may have a problem, and of course the sensor itself, I have one question did you tighten the sensor to the proper inch pound setting of torque? if not this can cause a code to set because the sensor does not vibrate as designed to send a signal of a engine knock/ping.

Oct 16, 2008 | 2001 Chevrolet Venture

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