NissanForums.com :: Nissan Forum - View Single Post - HOW TO: A'PEXi SAFC II, X-Trail QR25DE

thetimster · Jun 28th, 2005, 06:51 AM

Hi ValBoo,

Thanks for the answers. Now its more clear. And yes, now that I read your post again, you DID say "no less than 1 cm". My bad.

I'm thinking I can probably do the hardwire connections even without my headers yet. It will just sit there until the headers arrive. As long as it isn't turned on, it shouldn't affect the car, right?

Reading your post is getting me excited. I'm already thinking I might dive in this weekend. Will let you know.

Quote:

Originally Posted by ValBoo

Hi Tim,

I'll try to answer the best I can:

1) Connection Diagram:
There are 2 separate ECM connectors: The layout more closely resembles SAFC manual, picture N10-c as below:

(You know what? I just noticed I had posted the wrong one on my page ...Sorry)

The corresponding layout can be found in the car's electronic service manual; I doubt very much that yours would be different but you will see immediately when you look at your connectors.

2) MAF sensor type:
There are various methods to measure air flow and three main Air Flow Sensor types: Hot Wire type, Flap type, and Karman type.
The sensor type used on the QR25DE is a "Hot Wire" type. It can be seen by looking at the sensor and also it is described in the service manual.

But I found this link if you are interested in reading about each type of MAF:
http://www.autoshop101.com/forms/h34.pdf

3) The ECM itself does not need to be taken out. Just unplugging the connector one at a time is enough.

4) Correct. I guess my writing was confusing; I wrote: "no less than 1 cm" meaning you must have more than 1 cm between each ground connection taps. (there is not much room up on that connector wire: I managed to get 2 cm between the wires)

Keep reading that manual, it can only make things easier if you are familiar with it

Good luck, & let me know when you decide to dive in.