What type of repair is needed and how much does it usually cost? I have 2005 Nissan Maxima
Here is the definition. Cost would depend on your area and the actual problem found after testing.
P1800 NISSAN Description
When the engine is running at low or medium speed, the power valve is
fully closed. Under this condition, the effective suction port length
is equivalent to the total length of the intake manifold collector's
suction port including the intake valve. This long suction port provides
increased air intake which results in improved suction efficiency and
higher torque generation.
The surge tank and one-way valve are provided. When engine is running at high speed, the Engine Control Module (ECM)
sends the signal to the Variable Intake Air System (VIAS) control
solenoid valve. This signal introduces the intake manifold vacuum into
the power valve actuator and therefore opens the power valve to two
suction passages together in the collector.
Under this
condition, the effective port length is equivalent to the length of the
suction port provided independently for each cylinder. This shortened
port length results in enhanced engine output with reduced suction
resistance under high speeds.
Read more: http://engine-codes.com/p1800_nissan.html#ixzz2JgphPIVM
SOURCE: 2002 nissan maxima, check engine
About DTC P1800, I suggest check the harness and verify it is plugged in and still functioning.
Also, try checking your vac tubes to verify that they are not reversed. Also read this TSB with details about correct diagnostic: DTC P1800 VIAS CONTROL SOLENOID VALVE
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.
DTC detecting condition:
• An excessively low or high voltage signal is sent to ECM through the valve
Possible cause:
• Harness or connectors (The solenoid valve circuit is open or shorted.)
• VIAS control solenoid valve
Will need replaced the solenoid valve (P/N - 149558J10A). The valve is located
under the engine cover. It's a Nissan only part so you have to order
from the dealer, either online or in person. It's cheaper online. Check this sample Nissan engine location (click image for zoom)...
DTC P1147 - Bank1 Sensor 2 O2 sensor maximum voltage monitoring
Component Description: The heated oxygen sensor 2, after three way catalyst, monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.
DTC detecting condition: The maximum voltage from the sensor is not reached to the specified voltage.
Possible cause:
Harness or connectors (The sensor circuit is open or shorted)
Heated oxygen sensor 2
Fuel pressure
Injectors
Majority of cases this is either a faulty O2 sensor, or short/open in wiring harness. Bank1 sensor2 is the rear O2 sensor on the passenger (right) hand side (click image for zoom):
Here is simple test with voltmeter to test O2 sensor. If it fails test,
replace sensor. If not, then you will have to start tracing the wiring
harness for a short/open in it (click for zoom):
And here additional details: DTC P1147 O2 Sensor
Keep us updated.
Help with this
Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
P0083 Description
Intake Valve Control Solenoid Circuit High Bank 2 is the generic
definition for the P0083; however your vehicle's manufacturer may have a
different definition and information for the P0083 code.
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