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I don't ever recall seeing a code that would relate to the fuel pump failing to start. The OBDII system is primarily an emissions compliance system (anything that would cause the engine to drift out of compliance will generate a code). An engine with a pump that fails to start generates no emissions, so no code. If the pump is becoming weak, it can fail to develop adequate fuel pressure under high engine load which can result in a lean fuel mix which would likely trigger one of the mixture out of range error codes. A lot of the codes have a repeat threshold, they have to occur 2 or 3 times before the check engine light comes on. So, it is possible for you to have a code stored without having the check engine light on. But, you have been living with this problem long enough that if the pump was causing a lean condition I would have expected the check engine light to come on by now. The other thing to factor in is that a weak pump may only generate a lean condition under high engine output. If you are just driving around, the lean condition may never materialize and there may be no associated codes. So, short answer is if you don't have one, I would not bother buying a the code reader. Chances are the code reader will not reveal anything. Also, if you check the service manual, you can retrieve any stored codes using the service check connector. Its a bit of a hassle to use, counting short and long light flashes; but, zero cost.I have a suggestion for a possible test. Do the test by turning the ignition switch to on and listen for the pump to prime (don't start the engine). If the pump primes, switch back to off and wait 30 seconds or so and then repeat the test. The objective is to see if you can trigger a failure of the pump to prime. How many time you repeat this test is subjective. If it primes 10 times in a row, I would probably be inclined to stop the test and then retry on a different day. At some point, if you can't trigger a failure of the pump, it may be time to move on to considering some other point of failure. When doing this test, it may be advisable to unplug the fuel injector resistors (not the fuel pump resistor). Some fuel injection systems 'burp' the fuel line by opening the injectors briefly during the priming pulse. This is separate form the injections taking place during cranking. I don't know whether the NSX EFI does this burp during priming; but, if it does, you don't need to be repeatedly squirting a bunch of raw gas into the cylinders when testing the pump. Pulling the injector resistor plug will prevent the injectors from opening and potentially squirting gas into the cylinders.
I don't ever recall seeing a code that would relate to the fuel pump failing to start. The OBDII system is primarily an emissions compliance system (anything that would cause the engine to drift out of compliance will generate a code). An engine with a pump that fails to start generates no emissions, so no code. If the pump is becoming weak, it can fail to develop adequate fuel pressure under high engine load which can result in a lean fuel mix which would likely trigger one of the mixture out of range error codes. A lot of the codes have a repeat threshold, they have to occur 2 or 3 times before the check engine light comes on. So, it is possible for you to have a code stored without having the check engine light on. But, you have been living with this problem long enough that if the pump was causing a lean condition I would have expected the check engine light to come on by now. The other thing to factor in is that a weak pump may only generate a lean condition under high engine output. If you are just driving around, the lean condition may never materialize and there may be no associated codes. So, short answer is if you don't have one, I would not bother buying a the code reader. Chances are the code reader will not reveal anything. Also, if you check the service manual, you can retrieve any stored codes using the service check connector. Its a bit of a hassle to use, counting short and long light flashes; but, zero cost.
I have a suggestion for a possible test. Do the test by turning the ignition switch to on and listen for the pump to prime (don't start the engine). If the pump primes, switch back to off and wait 30 seconds or so and then repeat the test. The objective is to see if you can trigger a failure of the pump to prime. How many time you repeat this test is subjective. If it primes 10 times in a row, I would probably be inclined to stop the test and then retry on a different day. At some point, if you can't trigger a failure of the pump, it may be time to move on to considering some other point of failure. When doing this test, it may be advisable to unplug the fuel injector resistors (not the fuel pump resistor). Some fuel injection systems 'burp' the fuel line by opening the injectors briefly during the priming pulse. This is separate form the injections taking place during cranking. I don't know whether the NSX EFI does this burp during priming; but, if it does, you don't need to be repeatedly squirting a bunch of raw gas into the cylinders when testing the pump. Pulling the injector resistor plug will prevent the injectors from opening and potentially squirting gas into the cylinders.
