Engine Swap in Nissan Sunny 1991 (B13)

[spectra]

[spectra]

[spectra]

[spectra]

[atta1111]

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[IsbCap]

Who cares - man, screw the engineeers who designed the engine. - Nitto logic.

Why Nissan didn't hard code the map inside ECU???

I think they've left room for tuning the engine, provided one uses the brain and has the knowledge of what he's doing...

[IsbCap]

@spectra

I don't understand English, talk to me in Russian

[atta1111]

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[IsbCap]

@star2

Well..... after fixing fan's grounding and using the multimeter on some ECU wires, the fear that I'll either melt the ECU or myself is gone, Alhamdulillah

So with one of my biggest wishlist of running the fan on auto through ECU, I decided to give it a try today.

First thing I wanted to make sure was the proper working of temp sensor. So studied the manual, disconnected the fan, connected the multimeter to pin 54 and was happy to see the reading starting from 2.7 and go down to 1.7 in small steps of around 0.05V. So concluded that temp sensor is working fine...

Now i expected 12V on pin 14 when the engine is cold. To my disappointment, it was unstable between 0~250 mV.

So got back to manual to find out that Refrigerant pressure sensor also has a role to play. With AC OFF, it was supposed to give 12V, and with AC ON, 0V.

But it's giving 5V :S. What could be the reason for this 5V?

Now I've put it to tomorrow to check the location of the sensor. If it exists in the first place, then fine. Else, I'm planning to give 12V direct from battery to pin 109, so that AC input is bypassed.

What do you suggest???

[IsbCap]

to allow there shop's and peaople's to tune the engine's according to their local requirement's. As the company cannot write the different map for each engine so they write a comman map for all of the engine's in the batch in result some are perfect enough with which the map is matched and hence Performance + Economy jump's in and some engine's doesnot perfect enough as compared to the first one resulting in the Bad performance but good fuel economy or Good Performance with Bad fuel economy that's it. That's what they told us during Training.

Pretty hard to digest :-#

[star2]

@isbcap

You don't have refrigerant pressure sensor present. Next !

[IsbCap]

@IsbCap

You don't have refrigerant pressure sensor present. Next !

Means that 5V is dummy signal? So I'm gonna give it 12V to bypass it???

[star2]

to allow there shop's and peaople's to tune the engine's according to their local requirement's. As the company cannot write the different map for each engine so they write a comman map for all of the engine's in the batch in result some are perfect enough with which the map is matched and hence Performance + Economy jump's in and some engine's doesnot perfect enough as compared to the first one resulting in the Bad performance but good fuel economy or Good Performance with Bad fuel economy that's it. That's what they told us during Training.

Are you serious brother? We are talking about Nissan or Adam ?

I don't think so they are dumb enough to plant QG18DEs with hit and trial ECU's, chal gaye to chal gaye, na chaley to customer key.... Wah Wah

Where did you take that training by the way

[star2]

Means that 5V is dummy signal? So I'm gonna give it 12V to bypass it???

That 5V is controlled ground, sensor ground, or sensor output whatever you say..... It is a legit signal, which your pressure sensor requires.... not you

[IsbCap]

Btw, it should be checked on pin 58 or 109?

(I checked on 109, red wire)

And if refrigerant pressure sensor is present, it is supposed to give either 0V or 12V. No mention of 5V anywhere...!!!

[star2]

Btw, it should be checked on pin 58 or 109?

(I checked on 109, red wire)

And if refrigerant pressure sensor is present, it is supposed to give either 0V or 12V. No mention of 5V anywhere...!!!

Bhai jaan, refrigerant pressure sensor is placed on the AC drier bottle..... As your Condensor and its bottle are not from the N16, so the 99.99% chances are you don't have that RPS. RPS is not a part of engine sensors. It is placed alongside the condensor, in the drier bottle. I hope you got it now.

[IsbCap]

Bhai jaan, refrigerant pressure sensor is placed on the AC drier bottle..... As your Condensor and its bottle are not from the N16, so the 99.99% chances are you don't have that RPS. RPS is not a part of engine sensors. It is placed alongside the condensor, in the drier bottle. I hope you got it now.

Roger sir. Solution? (other than putting the N16 stuff). Don't tell me that my fans will always remain on due to this RPS issue

[star2]

Your 14 # pin will connect to the "function" point of the relay, consider it as a ground and the other side of it will be connected to 12V from fusebox. Other four wires of the relay will simultaneously operate both fans, one ground each and one 12V to fans each. You will need a God-Damn 6-point Nissan Relay in your Fuse-Box.

Bus, aaj key liye itna hi I'm going to sleep now

[star2]

@isbcap

and for your information, Nissan's both fans operate together, just for a few seconds, say 3-4 seconds and it takes times to reach to the operating temperature from cold. Tested many times.

[star2]

@isbcap

and by the way, when you are tired and dead finding the RPS, do call me, I'll get you one. Telling you I will charge my fees

lol if atta bhai takes it, why should not we right @xulfiqar bhai