The knock sensor connector enters the same single cable where it connects but comes 2, I'd like to know which is the second cable if ground

The knock sensor on a 2003 Honda CRV is located on the engine block. Specifically, it is located under the intake manifold, which means it can be difficult to access. Here are the steps to locate and replace the knock sensor on a 2003 Honda CRV:

1. Disconnect the negative battery cable to prevent electrical shock.
2. Remove the intake manifold. This involves removing several bolts and electrical connections.
3. Locate the knock sensor, which is located near the rear of the engine block, under the intake manifold.
4. Disconnect the electrical connector from the sensor.
5. Remove the sensor from the engine block. This may require a special tool, depending on the specific design of the sensor.
6. Install the new knock sensor, making sure it is properly aligned and tightened to the correct torque specification.
7. Reconnect the electrical connector to the sensor.
8. Reinstall the intake manifold, making sure all bolts and electrical connections are properly secured.
9. Reconnect the negative battery cable.

Note that if you are not experienced with working on engines or are unsure of how to proceed, it may be best to seek the assistance of a qualified mechanic to replace the knock sensor on your 2003 Honda CRV.

the following information courtesy of OBD-CODES.com P0328 Knock Sensor Circuit High Input OBD-II Trouble Code Technical Description Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor) What does that mean? Knock sensors are used to detect engine pre-detonation (engine knock or ping). The knock sensor (KS) is usually a two wire sensor. A 5 volt reference is supplied to the sensor and there is a signal return from the knock sensor to the PCM (powertrain control module). The sensor signal wire informs the PCM when a knock occurs and in what degree of severity. The PCM will retard the spark timing to avoid pre-detonation. Most PCMs have the ability to learn spark knock trends in the engine during normal operation. A P0328 code is a generic DTC, thus it applies to all makes of vehicles, and refers to a high output voltage of the knock sensor. In many cases, this means the voltage is above 4.5V but that specific value depends on the specific make and model of vehicle. This code refers to the sensor on bank #1. Symptoms Symptoms of a P0328 DTC may include: MIL (Malfunction Indicator Lamp) illumination Audible knocking from the engine compartment Pinging from engine under acceleration Loss of power Irregular RPM Causes Potential causes of a P0328 code include: Knock sensor connector is damaged Knock sensor circuit is open or shorted to ground Knock sensor circuit is shorted to voltage Knock sensor has failed Loose knock sensor Electrical interference in circuit Low fuel pressure Incorrect fuel octane Mechanical engine problem Failed/faulty PCM Possible Solutions If you can hear engine knock (detonation), first fix the source of the mechanical problem and retest. Ensure the correct octane fuel was used (some engines require premium fuel, check the owners manual). Aside from that, for this code, most likely the problem will lie either with the knock sensor itself or the wiring & connectors going from the sensor to the PCM. Realisitcally, for the DIY vehicle owner, the best next steps are to measure the resistance between the two knock sensor wire terminals where they go into the PCM. Also, check the voltage of the same terminals. Compare those numbers to the manufacturer's specifications. Also, check all wiring and connectors leading from the knock sensor back to the PCM. In addition, you should also check the resistance using a Digital Volt Ohm Meter (DVOM) of the knock sensor itself, compare it to the vehicle manufacturers specification. If the knock sensor resistance value is out of spec, then it needs to be replaced. Other knock sensor DTCs include P0324, P0325, P0326, P0327, P0328, P0329, P0330, P0331, P0332, P0334 Register now to ask a question (free) Related P0328 DTC Discussions

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What you propose will not work with your pcm. If you have 2 wires to the knock sensor, one is probably a reference wire and the other a signal. The computer will throw a code and will not understand the return signal.

P0326 - Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor) High Voltage
Knock sensors are used to detect engine pre-detonation (engine knock or ping). The knock sensor (KS) is usually a two wire sensor. A 5 volt reference is supplied to the sensor and there is a signal return from the knock sensor to the PCM (powertrain control module). The sensor signal wire informs the PCM when a knock occurs and in what degree of severity. The PCM will ****** the spark timing to avoid pre-detonation. Most PCMs have the ability to learn spark knock trends in the engine during normal operation.

If the PCM determines that the knock is out of the ordinary or that the noise level is abnormally high, P0326 may set. If the PCM senses that the knock is severe and cannot be eliminated by retarding the spark timing, P0326 may set. Keep in mind that knock sensors cannot distinguish between a knock from pre-detonation or one from engine problems.

Symptoms of a P0326 DTC may include:
MIL (Malfunction Indicator Lamp) illumination
Audible knocking from the engine compartment
Pinging from engine under acceleration

Potential causes of a P0326 code include:
Knock sensor connector is damaged
Knock sensor circuit is open or shorted to ground
Knock sensor circuit is shorted to voltage
Knock sensor has failed
Moisture in knock sensor connectors
Incorrect fuel octane
PCM has failed

Possible Solutions:
If an engine knock can be heard, fix the source of the mechanical problem first then retest. Make sure the proper octane of fuel was used in the engine. Using lower octane fuel than what is specified can cause a ping or pre-detonation and may cause P0326.

Unplug the knock sensor and check for water or corrosion in the connector. If the knock sensor has a seal, verify there is no coolant from the engine block fouling the sensor. Repair as necessary.

Turn ignition to run position with engine off. Ensure that 5 Volts are present at the KS connector. If there is, check for proper resistance between KS terminal and engine ground. You will need a vehicle specification for this. If resistance is out of specification, replace the knock sensor. If resistance is normal, plug KS back in and idle the engine. Using a scan tool in datastream, observe KS value. Does it indicate a knock is present at idle? If so, replace the knock sensor. If the knock sensor shows no knock at idle, then tap on the engine block while observing the knock signal. If it doesn't show a signal that corresponds with the taps, replace the knock sensor. If it does, verify the knock sensor wiring isn't routed next to ignition wires. If there was no 5 volts present at the knock sensor connector while unplugged with KOEO (Key on engine off) then go back to the PCM connector. Turn ignition off and clip the knock sensor 5 volt reference wire in a location that is easy to repair (Or remove the wire from the PCM connector). With KOEO, check for 5 volts on the PCM side of the clipped wire. If 5 volts isn't present, suspect a bad PCM. If 5 volts IS present, repair short in 5 volt reference circuit.

Since the reference circuit is a shared circuit, you will need to check all engine sensors that are fed a 5 volt reference. Unplug each sensor one at a time until the reference voltage returns. When it returns the last sensor you plugged in is the shorted sensor. If no sensors are shorted, check the wiring harness for short to voltage on reference circuit.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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Hello! The Knock Sensor (see photo below) has a 2 wire connector...White is the Signal Lead and the second wire is the Shield Ground...It's a sensitive device...The shield has no color assigned but ties in to a common junction of Black chassis ground...It is located under the intake manifold..Guru..Saailer


ORIGINAL ENGINE MANAGEMENT Part # KS24...Cost=$80

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

The knock sensor detects engine detonation, allowing the powertrain control module (PCM) to ****** ignition control spark timing based on the knock sensor (KS) signal being received.

The knock sensor produces an AC signal so that under a no knock condition the signal on the KS circuit measures about .007 V AC. The signal amplitude and frequency are dependent upon the amount of knock being experienced.

If an engine knock can be heard, repair the engine mechanical problem first. If there is no apparent engine trouble, check the KS signal circuit for a poor terminal connection at the PCM. If a problem was found, replace the terminal.

Check the KS signal circuit between the PCM and the KS connector for an open, a short to voltage, or a short to ground.

You can measure the resistance of the knock sensor by connecting a digital volt meter (DVM)between the PCM connector and the engine block. It should read abot 100K ohms. If it doesn't, you should replace the knock sensor.

If the resistance is ok, then you can connect the DVM to monitor AC voltage between the PCM connector and engine ground. Make sure the engine is off and the PCM is disconnected. Tap on the engine lift bracket with a socket extension while observing the signal indicated on the DVM. If any signal is indicated on the DVM while tapping on the engine lift bracket, then the PCM needs replaced. If replaced, this unit needs to be reprogrammed.

Crankshaft Position Sensor Removal & Installation 5.4L & 6.8L Engines To Remove:
Before servicing the vehicle, refer to the precautions in the beginning of this section.

1. Remove or disconnect the following:
   • Battery ground cable
   • Accessory drive belt
   • A/C compressor electrical connector
   • Position A/C compressor aside
   • Crankshaft position sensor electrical connector
   • Bolt and the sensor

To Install:

1. Install or connect the following:
   • CKP sensor torque bolt to 89 in. lbs. (10 Nm)
   • Crankshaft position sensor electrical connector
   • A/C compressor and electrical connector
   • Accessory drive belt
   • Battery ground cable

6.0L Engine To Remove:
Before servicing the vehicle, refer to the precautions in the beginning of this section.

1. Remove or disconnect the following:
   • Battery ground cables.
   • Crankshaft position sensor electrical connector.
   • Bolt and the sensor

To Install:

1. Install or connect the following:
   • CKP sensor torque bolt to 8 ft. lbs. (11 Nm).
   • Crankshaft position sensor electrical connector.
   • Battery ground cable

Heated Oxygen Sensor (HO2S)- The Bank 1 Sensor 1 tells me that it's an upstream O2 sensor. The larger the number the further down the line of the exhaust it is. Removal & Installation 4.2L Engine
To Remove:

1. Raise and safely support vehicle.
2. Disconnect battery ground cable.
3. Detach electrical connector from right inner fender splash shield (if necessary).
4. Remove right inner fender splash shield (if necessary).
5. Disconnect heated oxygen sensor electrical connector.
6. Remove heated oxygen sensor.

To Install:

1. Apply anti-seize lubricant to heated oxygen sensor threads.
2. Install heated oxygen sensor. Torque to: 34 ft-lbs (46 Nm)
3. Connect heated oxygen sensor electrical connector.
4. Install right inner fender splash shield (if necessary).
5. Attach electrical connector to right inner fender splash shield (if necessary).
6. Connect battery ground cable.
7. Lower vehicle.

4.6L and 5.4L Engines
To Remove:

1. Raise and safely support vehicle.
2. Disconnect battery ground cable.
3. Disconnect heated oxygen sensor electrical connector.
4. Remove heated oxygen sensor.

To Install:

1. Apply anti-seize lubricant to heated oxygen sensor threads.
2. Install heated oxygen sensor. Torque to: 34 ft-lbs (46 Nm)
3. Connect heated oxygen sensor electrical connector.
4. Connect battery ground cable.
5. Lower vehicle.

Hiya,

Here you go:

2.5L Engine To Remove:

1. Disconnect the battery ground cable.
2. Remove the air cleaner housing.
3. Vehicles with 5-spd transmission: Remove the clutch slave cylinder and set aside.
4. Disconnect the knock sensor wire harness retainer from the coolant hose.
5. Disconnect the knock sensor (KS) wire connector.
6. Remove the mounting bolt and knock sensor from the engine block.

Hope this helps...

Cheers,

Did they replace the knock sensor?Check the wire going to the sensor(knock).Look for a bare place hiting up against something ,grounding it out.Make sure the plug to knock sensor is good.And make sure it is making a good connection,Knock sensors also ground a part of the computer to feed back imformation.This connection is a must,the truck will not perform at all,stumble,miss,and carry on.Sometimes even backfire.If they did not replace the knock sensor,replace it with high quality sensor from NAPA,or oem from dealer.This sensor has to be made perfect,no room for inperfection.The knock sensor is easy to replace,they just screw in a hole in the block.When removing the sensors,nothing will come out such as oil or water,this is a dry threaded hole.It is a bell shaped sensor.If you don`t know which sensor is bad,purchase one.replace one,and if there is no change,replace the other side with the old sensor you just took out,it will be a good one.I hope this helps you,Let us know if it does.