Page 3 (Updated 02-Nov-2008)
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EGRC, Temp, Power Valve
circuits
- EGRC System Circuit
- Coolant Sensors
- Power Valve System
Free Service Manual, Free Download.....see FAVORITE LINKS -page 26- FAVORITE LINKS
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EGRC System Circuit
EGRC system is the exhaust gas circulation system to fulfill environmental regulations. Generally it sucks 10% of your power and increases consumption... spewing more soot than it is supposed to be cleaning. Aligned with all other greenie politics [read: max tax]; see www.junkscience.com
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Take out all ctrl tubes one by one, check. Cut brittled ends off or replace.
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Busted Greenpee exhaust recirculation:
At left, intake with NO EGR, 250.000miles; At Right, intake with EGR, 80.000miles
This yellowish sludge fed to your engine will save our planet? ...and all that via swelling $audi wealth!
Time to unplug EGR and save gas?
Its also good practice to plug oil breather tubes as the gunk never helps combustion, keeps burnout residue low; see http://autospeed.com/cms/A_110826/article.html
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Coolant Sensors
ECU Engine Temp Sensor at left, Dash Temp Gauge sensor (LOL transmitter!!) at right hand ...
My ECTS sensor was measured 3kOhms at +20C
FSM Schematics contain Two temperature sensors, directly connected to ECU, see below the corrected schema. I have added the Note *1 text in the schema:
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The Dash Gauge input Sensor is NOT depicted in the ECU -schema, see this Instrument Cluster gauge -schema at right hand. Here the Sensor is called Thermal Transmitter ... :
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EGR Temperature Sensor and the Confuzean FSM:
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In the FSM (Download free, see page 26 ) EGR Temperature sensor -definition is used in coolant related explanations. Also there is one text telling about EGR exhaust temperature sensor... FSM-Writer blondie has here a real mixup hiccup... My Maxima VGE has no exhaust temperature measurement, in exhaust just one O2 Sensor and exhaust re-circulation EGRC -system.
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Following Temperature -related names can be found in the FSM:
- Thermal Transmitter (transmitter!!!)
- Engine Coolant Temperature Sensor
- Engine Coolant Temperature Sensor ECTS
- EGR Temperature Sensor
- Water temp
Temperature -related illustrations that can be found in the FSM, you decide...:
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Temp Sensor Summary:
1. TWO coolant temp sensors:
a. one single wire just only for dash gauge,
b. 2-pin yellow plug, 2-wire, to ECU (Used in all engine ctrl, also EGR ctrl).
2. NO EGR coolant temp sensors, never, none. Hello FSM...?
3. EGR exhaust temp sensor ... just in California models.
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Power Valve System
Power Valve is Vacuum operated, ECU controlled intake 'booster': On low rev's its closed and enhances the intake with longer airflow route to achieve more torque. On higher revs the actuator opens the valve located inside the intake manifold, for more airflow. Valve is controlled by ECU, enabled only when engine is warm.
I cant understand this system name: Yes Valve there is, Power havent ever seen. If this circuit is enabled or disabled, no difference...
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First maintenance on all vacuum operated control circuits is to take out all ctrl tubes one by one, check. Cut brittled ends off or replace.
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If you do not correct the leaks, your power is controlled by these cracked tubes: The cracking starts on all cars from age of five, most ten year old Maximas have at least ten leaking tubes. The cracking is mostly due to aging because of engine heat: the colder tube end is typically ok.
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Cracked control tube ends, LH pic. All hoses crack... this is oil fume ret line (attached to rear valve cover). Note the sludge stopper inside the tube. When replacing hoses, place it in the new hose.
When u pull a hose, physics dictate that then it stretches. This means it crimps, diameter will be smaller, if possible. Not helping u, huh? Thereby the hose has to be pushed, not dragged. Pushing enlargens its diameter. Also theyre kinda baked in the hotter, engine ends. But now there is one invention used in this pushing: a screwdriver... Another way to get it off is to split the hose end with knife.
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Power valve actuator on VG30E
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The Power valve diaphgram, axle and two 30mm flaps. At right the separaring wall with two holes where the opened flaps are seen.
The upper intake seen from below. The double wall hides the Power Valve axle, also works as a duct for oil fumes coming from engine via PCV valve.
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Functional Power valve (intake flap), Intake/IACV etc picture
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"And, Thou, Lord, in the beginning hast laid the foundation of the earth; and the heavens are the works of Thine hands: they shall perish; but Thou remainest; and they all shall wax old as doth a garment" Heb.
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