Question edited for clarity. Please include 'year make model' as well as engine type and cc.
Question moved to Toyota.
Whenever you are doing something that involves TDC (you don't say WHAT you are doing), not only must cylinder 1 be on TDC, but it must also be on the firing stroke with both inlet and exhaust valves closed.
Anything you want to know is on google and YouTube
https://www.google.com/search?q=2.0+1RZ
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What EXACTLY does it do when you turn the key? Nothing at all when you turn the key? Dashboard lights come on but just go dim when you try to start the engine? Or a very lazy attempt to start when you turn the key? For this check your battery. An old battery, (more than 5 years old), can hold a full charge but can be too weak to turn the starter motor. If you just have the battery light on this is probably a good place to start.
There are usually two. Both on the exhaust system.
The first is on the manifold, where the exhaust pipe joins and the other is after the first expansion box or Catalytic Convertor.
There are pressure sensors as well at the Cat so check first.
Code P0301 indicates a misfire in cylinder 1 of your 1996 Toyota Corolla 1.6L1. The most common causes of this issue are faulty spark plugs, worn-out spark plug coil packs, or faulty ignition system 123. You mentioned that you have already replaced the spark plugs, spark plug wires, distributor cap, and rotor button. However, it is possible that the new parts you installed are faulty or not installed correctly. You may want to double-check that the spark plugs are gapped correctly and that the spark plug wires are connected to the correct spark plugs
Code P0401 indicates a problem with the exhaust gas recirculation (EGR) system . The EGR system is responsible for reducing the amount of nitrogen oxide (NOx) emissions from the engine. The most common causes of this issue are a faulty EGR valve, clogged EGR passages, or a malfunctioning EGR vacuum modulator . Since you have already replaced the PCV valve, it is possible that the new part is faulty or not installed correctly. You may want to double-check that the PCV valve is installed correctly and that the EGR valve is functioning properly. If these two code problems persist, it is best to take your car to a trustworthy repair shop to diagnose the issue as quickly and accurately as possible .
The symptoms of a bad EGR Valve Control Solenoid in a 1996 Toyota Corolla 1.6L include rough idling or stalling, a smell of fuel, increased fuel consumption, pinging, tapping, or knocking sounds, failed smog test, and check engine light on . If you are experiencing any of these symptoms, it is recommended to get your vehicle checked by a professional mechanic.
In terms of DIY, you can try cleaning the solenoid valve with throttle body cleaner and then test the solenoid electronically with a 12-volt supply. If that doesn't work, you can replace the EGR valve, vacuum modulator, and VSV (if equipped) and clean out the carbon buildup to the intake from the EGR valve.
Please note that if you decide to drive the car without the EGR valve and the EGR Valve Solenoid working, you can keep cancelling the code. The ECM will try and work things out and compensate. However, it is not recommended to bypass the EGR valve .
You have to make sure it has spark plugs and a fuel pump and must work well. Reset Security System and engine immobilizer. Check for Diagnostic Trouble Codes.
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Apr 10, 2020 - Attempt a DIY reset by inserting the key in the ignition and turning to the "on" position, without cranking. Leave the key "on" for 10-15 ...
5 answers · Top answer: The anti-theft system of the Toyota Corolla works to disable the fuel injection and ignition of Your vehicle through the ECU if a security breach is detected. ...
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To reset a factory car alarm, first try pressing the "panic" button on your remote if you have one. If that doesn't do it, put your key in the driver's door in ...
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Jan 20, 2007 - on EGR codes, we recommend replacing the EGR, vacuum modulator and VSV (if equipped) and cleaning out the carbon buildup to the intake from the ...
If that finds nothing wrong, remove the EGR valve and bypass tube and check them for cleanliness and blockages. If they are blocked, follow your maintenance manual's instructions for cleaning them out so you do not damage the valve, then replace them and reset the ECM.
It seems to me that there is an error in the system, you should contact the dealership. I've encountered several of these errors when I've been redoing everything on my car. I purchased tacoma rock sliders because I decided that this would be the best solution and at the same time corrected some errors like yours, so as not to get into an unpleasant situation when I am far from auto repair shops.