2000 Mazda MPV locations of IAC Valve, EGR and PCV

ALLISON/RYAN

MEMBER
2000 MAZDA MPV

Engine Mechanical problem
2000 Mazda MPV 6 cyl Two Wheel Drive 83,401 miles

Can you provide a diagram or way for me to see the locations of these valves? They have never been replaced or serviced. When the van is cold and I start it, sometimes there is a loud hum coming from the air cleaner housing, but it warms up pretty well. When I get to the first stop or two, the engine idles a little rough. However, when the van is warmed up, it runs perfectly. Help!

1 Reply

IMPALASS

MECHANIC
3,112 POSTS

Hello -

If you do need to get back with me please let me know if your model is a DX, ES, or LX. Also is your engine size the 2.5L?

I have provided the info I believe you need. For the hum. . ...it may be your IAC. There is a TSB out on this. . ..I have attached that info and other info on the IAC.

Next the PCV. . ..the location and check of that. . .. . ..it should be inspected every 60,000 miles. Me, I would change it as they are not that much. . ...preventive maintenance I call it.

EGR. . ...I have attached a check for it. . ...the other check you need test equipment and the information on it.

Then some other sensor info

IAC information

IDLE AIR CONTROL (IAC) VALVE INSPECTION

Resistance Inspection

Disconnect the negative battery cable.
Disconnect the IAC valve connector.

Measure the resistance between the IAC valve terminals using an ohmmeter. If not as specified, replace the IAC valve. Intake Manifold; Service and Repair. If as specified but the Simulation Test is failed, carry out the "Circuit Open/Short Inspection". Resistance: 8.64 - 10.56 ohms

More Info IAC

Technical Service Bulletin on IAC

Engine Controls - Moaning Noise From Engine Compartment
Notes

01-009/03

2000-2001 MPV - FOGHORN/MOANING NOISE FROM ENGINE COMPARTMENT

Note: This bulletin contains revised sections. Please update your records accordingly.

REVISION NOTE: This bulletin supersedes 01-009/03, issued 04/02/03. The 2001 Model Year MPV has been included.

APPLICABLE MODEL(S)/VINs:
All 2000-2001 MPV with VINs JM3 LW28****100001 to 177884.

DESCRIPTION

Some vehicles may exhibit a foghorn or loud moaning noise coming from the engine compartment, which may occur when the engine is half-warmed up or the vehicle is being decelerated. This condition may be caused by an internal problem with the Idle Air Control valve (IAC). The IAC has been modified to correct this concern.

Customers with this concern should have their vehicle repaired using the following procedure.

REPAIR PROCEDURE

1. Verify customer concern.

2. Replace IAC valve with a modified part according to Workshop Manual (section 01-13) INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.

3. Verify repair.

PCV Information

Remove the PCV valve.
Blow through the valve and verify that air flows as specified.
If not as specified, replace the PCV valve.

EGR Information

Testing and Inspection
Notes

On-vehicle Inspection

Carry out the "EGR Control Inspection".
If not as specified, perform the following inspection of the EGR valve.
Resistance Inspection

NOTE: Perform the following test only when directed.

Disconnect the negative battery cable.

Inspect resistance of the EGR valve coils.
If not as specified, replace the EGR valve.
If as specified but the "EGR Control Inspection" failed, inspect the vacuum hoses for improper routing, kinks or leakage, and inspect "Circuit Open/Short Inspection".