2UZ swap into 1992 FJ80

DaveInDenver

Rising Sun Ham Guru
Joined
Jun 8, 2006
Messages
13,705
Location
Grand Junction
@Inukshuk @FunkyYota

I have EWD for 1994 Land Cruiser, which may not be at all the same as 1996 or Lexus.

This is the circuit and 26-pin connector.

Electrical Wiring Diagram_Cruise Control_p118.png

Screenshot 2025-01-28 at 08.41.26.png

The part number may be 88240-60660 and seems to apply to all 80 series and LX450. I have not checked for supersede.

Screenshot 2025-01-28 at 08.56.20.png

Screenshot 2025-01-28 at 08.57.19.png


So if the p/n and wiring matches, curious about which B-W wire you're seeing a voltage on.

Pin 14 is ignition on power in and pin 2 looks to be maybe neutral (or clutch) cancel? There are circuit reasons why each may measure a voltage open (assuming the constant power is present on 15). If they do show voltage as inputs the current you'd measure externally would be small (I'd expect 𝜇A, if anything) and depending on your meter could indicate zero.

Without the ECU schematic or tearing one apart it's hard to know but at least pin 2 I would not be surprised to see voltage on it open if this thing works like I'm thinking. Pin 14 less so, but not impossible. It's possible IG-on is only a sense line and actually powering any circuits in the ECU.
 
Last edited:

Inukshuk

Rising Sun Member
Joined
Aug 24, 2005
Messages
7,762
Location
Denver, CO
Much is same LC to LX for the years (group 1993 - 1994, and 1995 - 1997) but the differences get ya. 1996 LX450 Ignition circuit is different than 1996 80 by the Theft Deterrent system
Here is 1996 LX450. Voltage from pin 2. Yes, barely registered on meters most sensitive setting. We all conclude not enough to actuate solenoid on its own but was enough to tell the GM ECU to activate the solenoid.96LX450 cruise_Page_4.jpg96LX450 cruise_Page_3.jpg96LX450 cruise_Page_2.jpg96LX450 cruise_Page_1.jpg
 

DaveInDenver

Rising Sun Ham Guru
Joined
Jun 8, 2006
Messages
13,705
Location
Grand Junction
Much is same LC to LX for the years (group 1993 - 1994, and 1995 - 1997) but the differences get ya. 1996 LX450 Ignition circuit is different than 1996 80 by the Theft Deterrent system
Here is 1996 LX450. Voltage from pin 2. Yes, barely registered on meters most sensitive setting. We all conclude not enough to actuate solenoid on its own but was enough to tell the GM ECU to activate the solenoid
It sounds like the ECU itself is pretty similar. I'd be wary of driving an unknown load with it since it's called an input in both EWDs.

If anyone is interested in why I'm making this assumption, it's because I think this the base to a transistor switch. It may or may not harm anything driving another input through another input's pull up source and protection diodes. It would be more reliable through a better circuit than an input resistor network.

Of course, I dunno much. So.
 
Last edited:

Stuckinthe80s

Rising Sun Member
Staff member
Joined
Dec 29, 2017
Messages
2,353
Location
Lakewood, CO
Hey Nic, I’m currently reworking my harness for my swap. One of the things I’m gonna try to add in is cruise control. Did you end up getting that working for your rig?

I’m trying to figure out two things right now:
  1. If I should make a circuit to convert the vss to a digital input for the ecu or if you bought this thing and had success https://sirhclabs.com/product/cortex-ebc-speed-sensor-adapter/
  2. How to best control cruise control. Did you measure the resistors in the 100 series cruise switch by chance or know if the 100series cruise control stalk fits in the 80series spot?
Hey man! I went the simplest route and bought a gauge cluster from a 97 to use and routed the VSS signal through it to the ECM. The wiring going through the gauge cluster looked the same on the schematic on both the 97 and 99, so I followed my hunch thinking it would work, and it did. This was huge because it gave me accurate speed on the speedometer, and gave the ECM the signal it needed to control the cruise.

I still don't have the switch properly positioned, but I've be using the later model switch fitted into a 3D printed mount so it can go in the same location as stock. There was a guy on mud who figured out the resistor setup, but that was a bit much for me. I figured out the resistance it needed to be (Bad Boys ____ Our _____....) but couldn't figure out a feasible way of properly incorporating it.
 

FunkyYota

Rising Sun Member
Joined
Nov 6, 2019
Messages
311
Location
Evergreen
Hmmm. I’m thinking about hacking on the existing wiring to get the fj80 cruise control wiring to match up with the 2uz version, but I’ve gotta figure out the resistance values. I was thinking about getting one of these to see about mounting it up, or measuring the resistances. https://a.co/d/1B3B1XZ
 
Top