Cefiro Club
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cgui...nice or not? requested from Tom la...hehe...now we can have our very own sub forum...cgui said:
should we closed this thread n post our discussion on new threads? it is easier to share information...
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0909...check out the new thread on how to reset ur ECU by defcon!0909 said:
u r right by readin the 4th Gen if u r driving a32...
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The MAF or Mass Air Flow sensor is the part between the stock air box and the flat, square resonator. Image below...
It's function is to measure the mass of air going into the engine. This information is sent to the ECU, which enables it to calculate the correct amount of fuel to inject into the motor.
There are several types of MAF. The older ones found on the cars of the early 90's used to consist of a spring loaded flap inside a housing connected to a variable resistor. Air going into the motor passed through this housing and pushed back the flap. How far the flap was pushed indicated the mass of air going into the motor. This type air mass measuring device was also called an AFM or Air Flow Mass meter and is still in use today, but no longer appears on newer cars.
Air Flow Mass meter (Flap Type) - notice the squarish, angular housing.
Our MAF is a hot-wire type measuring device. Inside a tubular housing, a heated platinum wire maintained at constant temperature is stretched across the air channel. As the mass of air passes through the MAF, heat is drawn away from the wire. The MAF's electronic control will compensate by pumping more voltage into the wire to maintain the temperature. How much additional voltage is pumped into the wire is measured by the ECU and forms the basis of calculation of injector pulse width.
Z32 MAF similar in shape and design to our own A32 versions. Notice that the shape is tubular and the omission of the flap allows for a smaller, neater design.
Diagramatic representation showing the heated platinum wire...
To clean, simply remove and spray terminal cleaner or carb cleaner into the body and at the wire. Allow to properly air-dry before re-installing. Under no circumstances ever try to dismantle the MAF nor to touch the wire.
Like all ECU sensors in the car, output readings are 0 - 5V. However, the difference is in the rate of increase of voltage. Flapper type MAF's produce a linear signal whereas hot-wire type MAF outputs are logarithmic in nature.
It is this difference that had made it impossible (for the casual d-i-y modder) to replace his ailing flapper with a more modern hot-wire type MAF as the different ECU's are programmed to expect a certain type of signal. The mod requires a sub-ECU to modify the MAF signal so that the ECU will accept it. The cost of this mod makes it impractical, and a lot of modders have simply thrown out the flapper in favour of an after-market MAP (Mass Air Pressure) type programmable ECU. But that's another story...
It's function is to measure the mass of air going into the engine. This information is sent to the ECU, which enables it to calculate the correct amount of fuel to inject into the motor.
There are several types of MAF. The older ones found on the cars of the early 90's used to consist of a spring loaded flap inside a housing connected to a variable resistor. Air going into the motor passed through this housing and pushed back the flap. How far the flap was pushed indicated the mass of air going into the motor. This type air mass measuring device was also called an AFM or Air Flow Mass meter and is still in use today, but no longer appears on newer cars.
Air Flow Mass meter (Flap Type) - notice the squarish, angular housing.
Our MAF is a hot-wire type measuring device. Inside a tubular housing, a heated platinum wire maintained at constant temperature is stretched across the air channel. As the mass of air passes through the MAF, heat is drawn away from the wire. The MAF's electronic control will compensate by pumping more voltage into the wire to maintain the temperature. How much additional voltage is pumped into the wire is measured by the ECU and forms the basis of calculation of injector pulse width.
Z32 MAF similar in shape and design to our own A32 versions. Notice that the shape is tubular and the omission of the flap allows for a smaller, neater design.
Diagramatic representation showing the heated platinum wire...
To clean, simply remove and spray terminal cleaner or carb cleaner into the body and at the wire. Allow to properly air-dry before re-installing. Under no circumstances ever try to dismantle the MAF nor to touch the wire.
Like all ECU sensors in the car, output readings are 0 - 5V. However, the difference is in the rate of increase of voltage. Flapper type MAF's produce a linear signal whereas hot-wire type MAF outputs are logarithmic in nature.
It is this difference that had made it impossible (for the casual d-i-y modder) to replace his ailing flapper with a more modern hot-wire type MAF as the different ECU's are programmed to expect a certain type of signal. The mod requires a sub-ECU to modify the MAF signal so that the ECU will accept it. The cost of this mod makes it impractical, and a lot of modders have simply thrown out the flapper in favour of an after-market MAP (Mass Air Pressure) type programmable ECU. But that's another story...
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Heh...er...I got a little carried away there... 
Anyway, a Nissan Maxima is a Cefiro with slightly different body panels. It is the US version of our cars. Chasis, engine and electronics are exactly the same.
A lot of information can be garnered from their version of the Cefiro forums. The URL is...
http://www.maxima.org
Anyway, a Nissan Maxima is a Cefiro with slightly different body panels. It is the US version of our cars. Chasis, engine and electronics are exactly the same.
A lot of information can be garnered from their version of the Cefiro forums. The URL is...
http://www.maxima.org
chris...maybe u can create a FAQ for A32...defcon1 said:Heh...er...I got a little carried away there...
Anyway, a Nissan Maxima is a Cefiro with slightly different body panels. It is the US version of our cars. Chasis, engine and electronics are exactly the same.
A lot of information can be garnered from their version of the Cefiro forums. The URL is...
http://www.maxima.org
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Yes, I could...and I will be happy to do it! But a lot of articles will have to come from other sites as I doubt that I will have the time to write them all... :) So please don't accuse me of plagiarism...
But, a good faq starts with the basics and grows from there. Maxima.org has been around for a long time. And I think they would be happy to allow us to link to their articles... :)
Also, a good faq will attract more members... :)
But, a good faq starts with the basics and grows from there. Maxima.org has been around for a long time. And I think they would be happy to allow us to link to their articles... :)
Also, a good faq will attract more members... :)
hey guys
whats up?
anyone have a record of the cefiro members?
I was making 1 excel last time then when i came to melb then it stopped lol.
so yeah we should get 1 done?
like car model contact nubmer name and etc :P
whats up?
anyone have a record of the cefiro members?
I was making 1 excel last time then when i came to melb then it stopped lol.
so yeah we should get 1 done?
like car model contact nubmer name and etc :P
here u go...
Hi guys, i have one issue now in hand...I noticed that each time i open the car door or activate the alarm system, there will be a dual light indicator flashing...now, each time i open the door or activate the alarm system, only one side is flashing...at times, everything went back normal, at times, both lights will stay on even after i close the door or turnoff the engine...
Really have no idea what is going on???
Really have no idea what is going on???
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any different between the lead or unlead petrol to the cefiro 3.0engine?
nlexis...check the connector...might be loose....
patersonia...its not recommended to use lead petrol...why u wanna use those? from my understanding...lead petrol its for old gen engine and its no longer in sale to public...all r unleaded but with diff octane level...
never gen engines use unleaded petrol n the higher the octane, the better for performance...any other sife to clear this?
patersonia...its not recommended to use lead petrol...why u wanna use those? from my understanding...lead petrol its for old gen engine and its no longer in sale to public...all r unleaded but with diff octane level...
never gen engines use unleaded petrol n the higher the octane, the better for performance...any other sife to clear this?
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how about shell v power? is ta will be more powerful than unlead n lead?
From what i know. If using leaded petrol, it will kill your O2 sensor and Catcon.
Yes, racing fuel has lead. but on our cars, all emission propertise stop us from using Leaded fuel.
The Lead is replace by other chemical in unleaded fuel. (Lead act as lubricant)
Yes, racing fuel has lead. but on our cars, all emission propertise stop us from using Leaded fuel.
The Lead is replace by other chemical in unleaded fuel. (Lead act as lubricant)
defcon1 said:
the alarm module itself!...mine aslo "short short" liow...decided to change to other brand from rm200...prob solved....
Oic...coz this morning after turning on the engine, aircond couldn't fire up...after almost 5 minutes...and after turning off the engine and turn it on again, only it fired up...werid..feels like the car is telling me that he is falling sick...hahahahaqha. Hurray, tomorrow..V-Kool tinted glass....yahooo....next stop, paintjob...hahahah
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