Engine 3.1 need engine diagram to locate parts such as; IAC, EGR valve, thermostat, and others ty for your assistance

for the whole car, wow. tall order that.
surely we can focus on an area,
under hood

1. gas tank EVAP parts? rear of truck.
2. Evaporative emission canister purge valve on engine
3. HVAC vac parts?
4. brake booster..
5. EGR vac, reg solenoid.
6. Throttle body leak vacuum or gummed up throttle valve.
7. IAC , stuck, a vacuum + elect, part for idle controls
8. PCV valve leaking or hose to it cracked, is Vaccum.

engine problems? no hint as to what's up doc.
Scanning PCM shows DTC errors , ??
fails smog for evap or egr? both?
brake problems?
HVAC problems?
there is a sticker under the hood for engine hose routing, (lost?)

the service manual covers all that ( we have none)
https://eautorepair.net/Marketing/Default.asp

is this a vac hose fell off question
or how to test vacuum related parts>

best of all is post photos of things wrong under hood
like hose not connected then tell or show where the other end goes?

Please look at the following diagram to identify the engine sensors of RAV4 3RZ-FE.

Hope that works. Thank you for visiting Fixya.

possible causes are:

Dirty throttle body
Electric throttle control actuator incorrectly adjusted/faulty/damaged
Air leak on Intake
Poor electrical connection to the Intake Air Control valve

P0507 KIA Idle Air Control IAC System RPM Higher Than Expected

P0401 - Insufficient EGR Flow
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

Symptoms: You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

Causes: A code P0401 most likely means one or more of the following has happened:
The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
There is a blockage in the EGR (tube), most likely carbon buildup
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum

Possible Solutions: In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit:
Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
Clean out the EGR valve and/or tubing to remove deposits
Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
Replace the DPFE sensor (with a good quality / OEM one)
Replace the EGR valve


P1504 - Intake Air Control circuit malfunction
The problem likely is a defective IAC valve. You can check the valve by unplugging the IAC and checking the resistance between the 2 wiring pins, should be between 6 to 13 ohms. Also check the resistance from the pins to the IAC body, meter should read open circuit, any resistance reading from the pins to the IAC body indicates a short. I doubt that there is a problem in the wiring harness or PCM, it is possible and should not be ruled out, although it is not seen often.

Hi and welcome to FixYa!

Have a look on the IAC (idle air control) valve. Cleaning it may help resolve the problem.

Hope this information was helpful enough and thank you for using FixYa! Have a good one!

On page 6-6, Hanes #72030, you will find the diagram that shows the EGR Valve for models 1981 through 1984.The diagram also is followed by models 1985 through 1997. The valve works exactly the same in the 1997 as it does in the 1984. If you need a diagram online, follow this link;

http://www.nissanpartszone.com/diagrams/large/D21U/nissan-hardbody-pickup-1995-1997-egr-parts-147a001.png

The electronic EGR valve and solenoid assembly (3) is attached to the front of the right cylinder head (1). An exhaust gas routing tube connects the EGR valve to the intake manifold.



Disconnect electrical connector (1) from EGR solenoid (2). Remove two bolts (3) connecting EGR tube (4) to valve assembly. Remove gasket located between EGR tube flange and EGR valve assembly.

Remove two mounting bolts (2). Separate valve assembly (3) from cylinder head (1). Remove and discard metal gasket located between cylinder head and valve assembly.
The new EGR valve will come with a new metal gasket. You can reuse the smaller gasket for the metal pipe going to the egr valve as long as its not damaged.

TY for using Fixya; remember rated this post.

EGR(top)IAC(3bottom views).EGR will be on the intake,IAC will be on the throttle body.

try cleaning the inside of the MAF sensor with CRC brand MAF cleaner, it is availiable at any auto parts store for around $5