K3nnydie

I bought another used ECU an noting happen... Could a MAF Sensor cause this ???

GS400V8

iTrader: (4)

I really want your build to work, but I don't think your MAF is "bad" but rather not wired up right, or something else that feeds critical info to the ECU in order to start like Coolant Temp, Cam/Crank Sensors, TPS, etc.

Your car sounds exactly like many situations I've experienced where the electrical circuit is not complete

K3nnydie

I got it Running Today for the First Time Ever!!!!!!!!! come to find out the wire I tap that goes in the Igniter on the missing wire for Tachometer was causing my engine Not to Start I removed it from the Igniter and Band a few Cranks the engine Ran I had it Ran for 30 minutes .......Thanks You EVERONE FOR THERE TIME......

K3nnydie

So for the Igniter Pin 3 Tachometer signal can I run that wire to Harness Connector F59 Pin 20 Tachometer Input and get signal there to my Gauge Cluster ?

GS400V8

iTrader: (4)

Awesome I bet she runs great too! Its my pleasure and good job man. Here is a link that shows what wires to move on the ECU pins from the igniter plug to get your tach working.

https://www.clublexus.com/forums/gs-2nd-gen-1998-2005/353126-it-begins-2.html

K3nnydie

Well guess what that wire was Not my problem that I thought it was wrong it was connected correctly because today I tried to Crank it Again and it did Not want to Start so Im out of luck ... But I tested the wiring harness on the ECU Connecter B1,Pin 23 , Symbol NE+ I was not getting Signal from there but I tested the wire from the ECU to the Connector were it Plugs into the Crankshaft sensor its good and the Crankshaft sensor itself is Good ... So whats causing my Pin 23 Not to get Signal ? Are is my timing gear is off ? Or maybe the way I was testing it was Not the Correct way of Testing it for Signal?

K3nnydie

Would low transmission Fluid cause my engine not to Start?

LexLova

no

limp mode yes

LexLova

make sure you have correct ecu ending in 3A470

K3nnydie

Thats the one I have ......

K3nnydie

Im having low Spark coming out my Spark plug can this cause my car Not to Start?

burteboy

Do you have mil on. If so what code do you have. If you dont have mil on check around your intake manifold u may have a loose ground wire. check both sides.

K3nnydie

Im Sorry whats MIL ?

GS400V8

iTrader: (4)

A MIL is a check engine light code.

So you got it to start once, when you messed with the wiring, so I'm still sticking to the fact that something is shorting or not completing circuit.

Triple check your wiring. Check out the fuel pump ECU and wiring in the back of the car/trunk.
Also, maybe check out this video, I don't know if it will help much but it has some key things shown with the ecu.
He starts a 2JZGTE in his garage hooked up to nothing but a battery, and a bucket with fuel in it.

K3nnydie

Yup I only got it to start twice and that was it ..... Well i did the 12Volts Fuel Pump Mod because i was not getting good fuel pressure maybe its putting my ECU into Limp Mode to stop it from starting Up.....
But it does look like I have Low Spark Im thinking of buying a HKS Twin Power Ignition Box maybe thats what I need in order for my car to Start Up....


Thanks Gs400