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2003 nissan altima wont start


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onecon71
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Jun 3, 2012, 10:15 PM

Post #1 of 7 (10867 views)
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2003 nissan altima 2.5 liter 180000 miles the car after going somewhere has twice this last week not started it cranks but will not start as if the fuel pump is bad i listened for the fuel pump to come on when the key is turned but can hear nothing then after sitting for a night the car starts


Hammer Time
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Jun 3, 2012, 10:27 PM

Post #2 of 7 (10851 views)
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.



Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.


2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.


3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.


Once you have determined which of these functions has dropped out,
you will know which system is having the problem.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



onecon71
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Jun 5, 2012, 7:16 PM

Post #3 of 7 (10766 views)
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had the car checked today cause the service engine soon light was on the test said the camshaft position sensor circuit would this also cause the intermittent starting problem?


Hammer Time
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Jun 5, 2012, 7:17 PM

Post #4 of 7 (10764 views)
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What was the exact code number?




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



onecon71
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Jun 5, 2012, 7:37 PM

Post #5 of 7 (10758 views)
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oem number to cross p0340


Hammer Time
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Jun 5, 2012, 7:51 PM

Post #6 of 7 (10750 views)
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Component Description
The camshaft position sensor (PHASE) senses the retraction with intake valve camshaft to identify a particular cylinder. The camshaft position sensor (PHASE) senses the piston position.

When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor (PHASE) provides various controls of engine parts instead, utilizing timing of cylinder identification signals.

The sensor consists of a permanent magnet and Hall IC.

When engine is running, the high and low parts of the teeth cause the gap with the sensor to change.

The changing gap causes the magnetic field near the sensor to change.

Due to the changing magnetic field, the voltage from the sensor changes.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



onecon71
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Jun 5, 2012, 8:01 PM

Post #7 of 7 (10746 views)
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thanks for the help




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