ive got an 01 maxima. neighbors car trying to figure out whats going on. ... no start..he recently had some one put a clutch in the car and they couldnt get the car to start after the clutch was put in . the check engine light isnt comming on when you turn the key on.. tried reading codes and getting no communication .. found the ecu relay and used my power probe to send power to one of the connectors and herd the fuel pump prime up and theck engine light came on .. pulled codes .. got the dreaded P0505 also got a P0446 , a P1610 and a P1612 ... soo i have a iac code , an evap code and 2 nats codes .. i also have ndsII on my lap top .. ecm possibly got fried?

 

A common issue is with grounding when doing the clutch on an mt, if you dont sand down the bellhousing, the engine grounds poorly to the trans. Starters take the biggest toll here because thats its main ground. how do all your ground wires look?

 

Grounds are fine. The car cranks all day no problem. It refuses to fire. No spark and no fuel. When I manually powered up the ECM through the relay I heard the fuel pump energize. But that's it. I hooked up NDS2 It communicates but constantly get kicked out of the ECM like it doesn't want to communicate properly. Tried to relearn the key To get the nats codes go away and the security light to Go out but the key relearn kept being unseccussful

 

The only thing that makes sense to me is that they may have somehow damaged the wire harness. But even this is a bit far fetched as the wire harness doesn't run by the transmission.

In normal operation, the ignition key being turned on sends 12 volts to the ECU on pin 43. The ECU then puts a ground on pin 26 which energizes the ECU relay, sending 12 volts to pins 110 & 112 of the ECU to power it.

If you were jumpering in the relay socket, then you evidently were sending power down the relay pin 5 wire that goes to ECU 110 & 112.

But the ECU relay is a double pole relay meaning it has 2 sets of contacts in it for 2 different circuits. The ECU relay also sends 12 volts to the IAC valve (P0505).

So it appears that the ECU relay is not energizing. It could be the ECU but when you jumpered power in the relay socket and got some results, that makes me think the ECU is OK.

 

I checked pin 26.. It's getting 12 v.. and when I turn the key on .. nothing. The ecm isn't grounding it.. I used my power probe to ground it and I hear the ecm relay click on and the ecm powers up.. kinda .. I checked all my power going to the ecm and every thing is correct..

 

I am going to assume that you checked that pin 43 is getting 12 volts when you turn the ignition switch on. If that is true, then it looks bad for the ECU. You could remove the ECU and open it up. There are STA509 transistor chips that are used to make various solenoids turn on and off. Maybe one of them got burned up. It happens for the motor mounts and the IAC. Check out this link for photos and info (it is a long read).

https://maxima.org/forums/5th-genera...d-seconds.html

Please note that there a different versions of the printed circuit board in the ECU. While they do the same job, they look different. Just look for burned components.

If you find a burned chip, you can replace it or send the ECU out to a repair service.

 

Yes I did .. it is getting ignition switch power

 

Also do the manual trans cars have the electronic motor mounts or is that an automatic trans part

 

Automatic only.

 

Any More INFO on this...
My 2003 Maxima, Manual Transmission, Doing the Same Thing...!!!

Thanks....!!!

 

Read the document about ECU Failure Prevention (2nd link in my signature) and consult the decision table on Starting Problems (3rd link in my signature). You should be able to ask better questions then.