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  #1  
Old 06-12-2007, 11:36 AM
goofy123
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Default 96 Altima - Need urgent help

Hi guys

Just bought a 1996 Altima which has a few problems as listed below:

1. Error Code P1400, EGR-Solenoid valve Circuit using generic scanner
2. When I turn the key to on position the MIL light does not light up but lights up sometimes when car is running. Also when I run the car the MIL is generally flashing instead of being steady.
3. Fuel gauge does not ready full tank even when fuel seems to be fully filled in.

Thanks
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  #2  
Old 06-12-2007, 12:40 PM
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NissanTech NissanTech is offline
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2004 Xterra
 
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Quote:
1. Error Code P1400, EGR-Solenoid valve Circuit using generic scanner
You should start by downloading the "Engine Control" section of the service manual. Find the valve and make sure all the hoses and the connector are connected properly.

Quote:
2. When I turn the key to on position the MIL light does not light up but lights up sometimes when car is running. Also when I run the car the MIL is generally flashing instead of being steady
You should run the scanner again when the enigne is running, if the light is flashing you probably have more codes store in the ECM
Quote:
3. Fuel gauge does not ready full tank even when fuel seems to be fully filled in
.
You most likely have a problem with the fuel sender unit (level unit inside the tank), and the unit may need to be replaced.
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  #3  
Old 06-12-2007, 05:29 PM
goofy123
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I did the following as per the service manual:

1. Checked input from ECM to sub-harness connector of EGR Solenoid valve - OK
2. Checked connectivity on the output side of EGR solenoid valve sub harness connector and ECM connector - OK
3. Checked Solenoid valve functionality by applying 12V DC - Valve ok
4. Checked ECM pins - no bends or broken pins

in the manual it is mentioned that I need to check connectivity between EGR solenoid valve harness and the EGR solenoid valve - I did not find any connectivity- Does this mean the ECM is bad and not recognising the output from solenoid?

Checked EGR valve by lightly lifting the diaphragm during idle, engine stalls, hence concluded EGR valve is not held up and seated properly.

If I have to replace the ECM harness or ECM, how big a job is this?

----------------------
My scanner cannot be used during engine running mode. I suspect misfiring may be the cause of MIL flashing -- which in turn can be caused by EGR solenoid valve malfunction. That is my understanding correct me if I am wrong here. Also as per the service bulletin there may be misfiring due to bad plug wires. Will install new plug wires to check the same.
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for replacing fuel sending unit do I have to take the fuel tank down.
-------------------------

Thanks for your replies
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Old 06-14-2007, 08:55 AM
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Quote:
If I have to replace the ECM harness or ECM, how big a job is this?
It is a big deal; did you check the hoses connected to the valve? Make sure the hoses are not block. It is very rare to have a bad ECM, if a part need to be replaced I recommend to start with the solenoid.

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for replacing fuel sending unit do I have to take the fuel tank down.
No, you should be able to access the tank from the top.
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