2002 Maxima code P1800

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Alex Magdaleno - 24 Jan 2007 05:23 GMT

Hi there,

I got this code off my son's car with my code reader. Unfortunately, the
book that came with the reader does not list Nissan code numbers. My son's
Nissan book, which I think is a Haynes, does not have that number. Anyone
know what it pertains to?

Thanks

Alex

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Al Moodie - 24 Jan 2007 15:02 GMT

Hi,

>Hi there,
>
> I got this code off my son's car with my code reader. Unfortunately, the
>book that came with the reader does not list Nissan code numbers. My son's
>Nissan book, which I think is a Haynes, does not have that number. Anyone
>know what it pertains to?

My A33 (2002? thru 2004) FSM lists:

DTC P1800 VIAS CONTROL SOLENOID VALVE

Component Description
NFEC1400
The VIAS control solenoid valve cuts the intake manifold vacuum
signal for power valve control. It responds to ON/OFF signals from
the ECM. When the solenoid is off, the vacuum signal from the
intake manifold is cut. When the ECM sends an ON signal the coil
pulls the plunger downward and feeds the vacuum signal to the
power valve actuator.

Al Moodie.

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Alex Magdaleno - 24 Jan 2007 15:44 GMT

Thanks Al. Would this be a problem that could strand him of can he wait a
few days before taking it to the shop?

> Hi,
>
[quoted text clipped - 20 lines]
>
> Al Moodie.

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Al Moodie - 25 Jan 2007 00:17 GMT

>Thanks Al. Would this be a problem that could strand him of can he wait a
>few days before taking it to the shop?

Here's the straight dope, again from the FSM:

--------------------------------------
When the engine is running at medium speed, the ECM sends the
ON signal to the VIAS control solenoid valve. This signal introduces
the intake manifold vacuum into the power valve actuator and
therefore closes the power valve.
Under this condition, the effective intake manifold length is
equivalent
to the total length of passage A and passage B. This long
intake manifold provides increased amount of intake air, which
results in improved suction efficiency and higher torque.
When engine is running at low or high speed, the ECM sends the
OFF signal to the VIAS control solenoid valve and the power valve
is opened.
Under this condition, the effective intake manifold length is
equivalent
to the length of passage B. This shortened intake manifold
length results in enhanced engine output due to reduced suction
resistance under high speeds.
-------------------------------------

You will not be stranded, there is no urgency to get it fixed.

Al Moodie.

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Alex Magdaleno - 25 Jan 2007 05:05 GMT

Thanks Al,
I wondered how those variable intakes worked.

>>Thanks Al. Would this be a problem that could strand him of can he wait a
>>few days before taking it to the shop?
[quoted text clipped - 24 lines]
>
> Al Moodie.

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