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Engine, Trans, F/I & Tuning

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OEM Part Number: 22630-44B20
Price: $20.00-$30.00

On the 4th Generation Maxima engine the Engine Coolant Temperature Sensor is located in the water outlet tube close to the engine end of the upper radiator hose. There are two sensors in that area. The one nearest the hose is for the dashboard temperature gauge. The ECTS, the one you’re interested in, is right next to the the gauge sending unit. There is a good picture of these sensors in the Haynes manual on page 3-7.

With the engine cold, disconnect the ECTS and measure its resistance. Reconnect the ECTS, start the engine, run it until fully warmed up. Stop the engine, and repeat the resistance measurement. The “warm” reading should be a much lower value than the “cold” reading.

The specs for the ECTS are:

  • Engine coolant temperature 68F, ECTS resistance 2.1 – 2.9 Kohms
  • Engine coolant temperature 194F, ECTS resistance 0.24 – 0.26 Kohms

Replacements Symptoms/Notes:

  • Below about 30 degrees idle will die if I don’t keep my foot on the gas at startup. Once engine is warm it’s OK.
  • Just a quick update for anyone having the same problem. Replaced the CTS (ECU Temp sensor in the picture) and guess what? My multi-year cold start problem is OVER! She runs like new again. Over $1000 spent on MAF, TB cleaning, and more and all I needed to do was replace a $9.00 sensor.

Owner: Josh Emory

Year: 2002
Model: Maxima
Color: Charcoal
Engine: Gen2 VQ35DE
Transmission: 6-Speed Manual

Community Member Credit: ViperVadim / Eddy

This will allow you to use a newer Mass Airflow Sensor to your 1995-1999 Nissan Maxima.  This upgrade has been available for many years in the Maxima community. The newer MAF sensor is pretty much the same as 90% of the newer Nissan Models. Much cheaper and easier to find. You just need to be sure you also use the newer MAF housing when installing.

You can either get an OEM pigtail or use the one from eBay below. I went with the eBay pigtail which costs around $16 bucks shipped. The most important part is that you follow the pin order (wire colors do not really matter as long you follow pin order).

Pigtail eBay Link: https://www.ebay.com/itm/164695704632
Search Word (if link doesn’t work): 5 wire MAF Mass Air Flow Connector Nissan Infiniti Vq35

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Important Note: In order to properly use this new MAF, your car will require tuning. The car will drive OK but your idle will be off and may fluctuate. If you’re preparing to get an ECU tune using stock ECU, make sure to let your tuner know so new MAF can be factored in.
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For installing, you just need to match the wires as noted below. Very simple but please proceed with caution.

1995-1999 5thgen Maxima MAF Pinout

Pin 1: White = MAF signal (White)
Pin 2: Ground (Black)
Pin 3: +12v ( Red)

Separate IAT Sensor Plug
Pin 1: IAT Signal (Light Blue)
Pin 2: Ground (Black)

350z / Newer Maxima MAF Pinout

Pin 1: Blank
Pin 2: +12v (Yellow)
Pin 3: MAF Ground (Black)
Pin 4: MAF Signal (White)
Pin 5: IAT Signal (Blue)
Pin 6: IAT Ground (Red)

eBay MAF Pigtail

For reference, once you swap to this MAF… you can use MAF’s from any of the cars below. They all share the same exact MAF which makes this a better option.

NISSAN
 
350Z 2003-2008
370Z 2009+
Altima 2004+
Armada 2004+
Cube 2009-2012
Frontier 2005+
GTR 2009+
Maxima 2004+
Murano 2003+
NV1500 2012-2014
NV2500 2012-2014
NV3500 2012-2014
NV200 2013-2015
Pathfinder 2005+
Quest 2004+
Rogue 2008+
Sentra 2004+
Titan 2004+
Versa 2008+
Xterra 2005+
 
INFINITI
 
EX35 2008+
EX37 2011+
FX35 2003+
FX37 2013+
FX45 2005-2008
FX50 2009-2013
G25 2011+
G35 2004-2007
G37 2008+
JX35 2013+
M35 2006-2010
M37 2011+
M45 2006-2010
M56 2011+
Q45 2005-2006
Q50 2014+
Q60 2014+
Q70 2014+
QX50 2014+
QX56 2004+
QX60 2014+
QX70 2014+
QX80 2014+

Community Member Credit: Amave

So since i bought the car back in 2010 it had the constant DTC p1336 crank position sensor POS. , it never really was a problem in the past, since the engine ran good, it had a hard start but always started up every time, and other than the DTC i never had a problem. Well i decided to reseal the oil pan since i was passing it on to my son who is going away to college i figured if i do more work on it, the less he has to do to it when it comes time to fix it.

I resealed the oil pan and when i removed the pan low and behold i see my problem is the signal plate that is attached to the flywheel.

The kid i bought it from had the transmission and clutch replaced so when i got it the clutch was new so i had no reason to replace it , and if i had it long enough i am sure i would have had to replace it eventually. .

You can see the signal plate is damaged on the FW , i just wanted to share what i found just in case anyone has the same type of DTC and everything else checks out

And my beloved 2000 Maxima

Credit: Aaron NWP

Last night, I installed the Rev-up oil pump on my 02 Maxima engine. But before I did, I cracked it open.

Here are some observations.

Revup on left; Non-Revup on right

The first thing I noticed was the casing. The non-revup has a smooth casing with several imperfections and burs. The revup has a more consistent cast without any noticeable burs or flaws. Here is the other side:

Here they are opened up:

The first thing I noticed was that the rotors are slightly different. The revup has arrow marks on them and the non-revup has little dots. Other than that, they appear to be identical. I hold them up against one another and the rotor lobes have the same exact shape. The rotor dimensions are identical in every way.

But here’s the difference I found. On my postal scale (displays in .2 ounce increments), the two non-revup rotors weighed 10.0 ounces while the revup rotors weighed 10.4 ounces. There was a clear difference in weight meaning the metal is different.

I also took a few measurements of the inside of the casing. The inlet and outlet inside diameters are exactly the same. And the depth of the casing is exactly the same as well.

I don’t know the major differences between these two oil pumps. But I thought I’d share some of my observations. It appears that the revup oil pump rotors may be stronger. The casing may be a tad stronger as well.

The 7thgen Maxima has a very large MAF pipe diameter which is ALMOST as big as the Land Rover. Nissan knew the HR heads flow a lot more air so they adjusted the intake accordingly. Also, the 2009 Maxima comes with 75mm throttle body.

  • 2002 Maxima – 2.74”

  • 2003 350z – 2.83”

  • 2009 Maxima – 3.18”

  • Land Rover –  3.23”