Question about 1995 Nissan Maxima

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1995 Maxima SE tach does not work at all. Car runs/ drives fine but no tach. 2 check engine light codes one for knock sensor(which I think is actually the o2 sensor from what I have read) the other from the speed sensor or something like that. I have a haynes manual and there is nothing in it about the tach. I just got car and was told that some of the coils were recently replaced. So I think maybe wires are messed up or not reinstalled properly? I need help or at least some ideas.

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I am not familiar with this particular car, but the tach problem may be due to the speed sensor. I'd find the speed sensor and have it checked or replaced. My transmission has an input and output sensor. The input sensor feeds the tach (and the computer), the output sensor feeds the speedometer (and the computer). Also the knock sensor is critical to keep the car running efficiently without damaging itself.

Posted on Nov 14, 2009


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While driving the car runs fine, but when stoping at a stop it idles rough and try to cut off. pulled code gave code p0325. I changed the knock sensor but still gets code p0325, and car still misses at...

Hi Thomas,
We have a couple different issues here.
First, your Maxima is either NOT a 1995 model, or it is a very late 1995 model that "thinks" it's a 1996. The reason I say this is because a 1995 model Maxima is NOT OBD compatible and is not capable of outputting "P-codes" to a generic OBD scanner.
Those Nissans that were claimed to be OBD compatible in the late 1995 model year only output certain codes. To find out the rest of the story, you still need a scanner that has software capable of accessing the engine computer through the Nissan-2 connector (usually in the fuse block area).
Then you need to understand about Diagnostic Trouble Code (DTC) P0325.
This code does not necessarily mean that you need a new knock sensor. I think you will be a little less confused if you know the facts. What you need to know about ALL fault codes is that they NEVER tell you what parts to replace. Fault codes only tell you that the computer has a problem with one of the many circuits and systems that it monitors. The fault code will tell you which system is failing or which circuit is failing. They DO NOT tell you what is wrong with the circuit or system that it is reporting. The person diagnosing the vehicle is supposed to figure that one out.
Most people think that "diagnostics" means plug in the "magic box" and replace everything the computer tells you to replace. I WISH it was that easy!
Now that you know all of this, we can examine the code itself. What causes this code to set? ...I'm glad you asked. The computer controls the ignition timing in your car. The trick is to advance the timing as far as possible (for more power and efficiency) while not advancing it too far, which will cause pre-detonation (also known as "ignition ping"). Pre-detonation can cause serious engine damage, including burning holes through a piston.
Here is where the knock sensor comes in.
SCENARIO 1: The computer advances the ignition until the knock sensor "hears" an ignition ping. When this happens, the knock sensor sends a signal to the PCM to let it know that the engine is "knocking". So the computer responds by retarding the timing a little to stop the knock. When the knock stops, the knock sensor will stop sending a knock signal to the computer.
DTC P0325 sets when the computer has ******** the ignition timing as far as it possibly can and the knock sensor is STILL sending a knock signal.
SCENARIO 2: The computer also tests the knock sensor by deliberately advancing the timing too far for a few seconds to see if it gets a signal from the knock sensor.
So, P0325 can also set if there is NO signal from the knock sensor when the computer is EXPECTING a signal.
For scenario 1, the cause is usually a mechanical knock in the engine. Loose timing belts, worn/loose timing chains worn distributor shafts, bad pulley bearings, etc. The knock sensor does not know the difference between a knock caused by pre-detonation and a knock caused by a loose valve lifter (or other mechanical reason). The knock does not go away when the timing is ******** because the knock is not CAUSED by timing....code P0325 sets.
For scenario 2, the cause is usually either the knock sensor itself or a problem with the wire between the knock sensor and the computer or the knock sensor is not grounded properly. These things will cause the knock sensor to not be able to get a message through to the computer....code P0325 sets.
Now, the misfire at idle is a whole other issue. The computer will default to base ignition timing settings if there is a knock sensor fault. You may notice a little loss of performance, particularly during heavy acceleration, but there is NO WAY that your knock sensor is the CAUSE of ANY misfire - especially not at idle. However, it is VERY possible that whatever is causing the misfire could also be the cause of the knock sensor code.
Basically what I am saying here is that you need to put the knock sensor problem "on the back burner" until you find out what is causing your misfire. Unfortunately, misfires can be cause by a LOT of different things ranging from a bad spark plug to a cracked cylinder head or worn-out piston rings. The misfire simply has to be diagnosed using the proper procedures to avoid replacing a bunch of things that will not fix the problem.
With all that said, WHEW! I hope you got through all that!
The older Nissans are notorious for the distributor shaft bushing going bad and causing a loud "rattling" noise. The movement of the shaft can cause a cylinder misfire, and the rattling can cause a knock sensor code to set. I have fixed many of the Nissan V-6 engines with this same problem by replacing the distributor. This is the FIRST place I would look. If your distributor is not rattling, try revving the motor just a little and see if it rattles. If it does, replace it. If it does not, let me know and we will look elsewhere for the cause of your problem.
-Dave (dttech)

Nov 19, 2011 | 1995 Nissan Maxima

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P0325 and p1320 coming up, new coils, new knock sensor, does not misfire at alll anymore, drives fine need to get check engine light off to pass inspection

After your car has performed enough successful warm-up and run cycles, the codes will clear and your check engine indicator will shut off.

Alternatively, a car parts store can clear them for you with an OBDII compliant scanner.

Aug 25, 2011 | 1999 Nissan Maxima

1 Answer

'99 Maxima SE manual with 147k: I had my car parked (on grass) for 2 years while I drove a company vehicle. I just got it back on the road and am getting codes for rear upstream O2 sensor and knock...

O2 sensor is mounted in the exhaust manifold ,

Knock Sensor Strategies: A failure with the knock sensor can cause spark knock and engine damaging detonation because the PCM will not know to ****** ignition timing if knock is occurring.

I suggest to replace spark plugs before you return back.

May 16, 2011 | 1999 Nissan Maxima

1 Answer

Start sometimes and falls dead and check engine lights reads knock senser, closed coolant curcit, and something with coolant senser. The car took awhile to start yesterday and had a loud gas smell and...

I would try and replace the knock sensor. If the sensor reads a knock or any movement it shouldn't be doing the car will shut off right then and there and then you have to wait a while for it to start again.

Feb 06, 2010 | 1995 Nissan Maxima

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

1 Answer

95 nissan maxima 3.0. have replaced knock sensor

I would have the charging system checked for over-voltage and AC ripple. There maybe a hidden wire harness problem if the charging system is okay. Wiggle test the wire harness while the engine is running to help locate the problem area. That is way to many parts replaced.

Oct 28, 2009 | 1995 Nissan Maxima

1 Answer

Where is coolant temp sensor and knock sensor on 95 nissan maxima

Mine usually stalled coming out the driveway. I went thru replacement of 6 coils and plugs with almost no improvement on my 2000 maxima. Ultimately the mass air flow sensor was replaced. All the engine codes from check engine light would make you think the engine needs overhaul, due to the nature of resultant bad engine performance. You can buy maf sensor $100 online. 5 minutes to install it. I tried cleaning it, but it made no difference until I replaced it. After that it was like 50 more horsepower.

Jul 03, 2009 | 2000 Nissan Altima

1 Answer

I got 1995 nissan maxima , my car is running fine , after i shut off i leave it for day car crank but no start, have code p325 knock sensor, i check no spark , little injector pulse some times, have...

The knock sensor error could be the sensor, sensor circuit, or some misfire caused by a dirty/bad injector or some ignition problem.

One issue that might tie it all together is coolant leak causing the misfire/knock like a head gasket, but I think you would be throwing more codes or you would see more problems than what you have.

May 19, 2009 | 1997 Nissan Maxima

1 Answer

1996 Nissan Maxima 2.5 V6 Engine Knock sensor The engine runs fine; but it sets off 2 codes knock sensor & ignition. Just this week had the plug wire and knock sensor changed, new. Still the same code...

The knock sensor is a major pain in the a..s to change I would suggest taking it to a reputable shop for a second opinion to see if they realy performed the work. Also with OBD11 (2) diagnostics if you have multiple misfires its not the wires its something else, also if you got a code for a misfire it would be specific as to which cylinder is misfiring. My best guess would be to get your coil checked.

Mar 18, 2009 | 1996 Nissan Maxima

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