greenbuggy

Last week I (mostly) finished up my 3.4 swap after the 3.0 started declining rapidly in order to get my truck and stuff moved from Iowa to Colorado. Sadly, no cruise but I'd really like to get it working.

So, donor engine/ECU/harness came from a 95 T100 manual 4x4. Had cable for speedo in cluster and servo-operated CC.
Swap truck is a 93 SR5 3.0 manual 4x4. Electronic VSS and speedo gauge, vacuum operated CC.

From the engine/trans harness of the 3.0 I cut back the wires from the VSS and ran them up to my conversion harness. I have 3 wires on this harness:
Black w/Orange: +12V from switched power IH2 pin 8
Green w/blue: VSS signal IH1 Pin 20 IH2 Pin 13
Green w/red: VSS ground IH2 pin 19

I also spliced Green/Blue wire to E4 pin 8 (green) VSS signal on the 5VZ ECU.

I have seen on here that the 5VZ servo cruise cable is longer than the vacuum cruise cable, but can be swapped over to the vacuum cruise unit. Maybe its just the early year or the fact it came from a T100, but the servo cable from my donor vehicle was about the same length.

So I extended the cruise unit vacuum hose and extended the 3 wires from the triangular connector so that I could get the cruise actuator close enough to the engine for the throttle cable to reach.

I test drove and my speedo is working but cruise is not (both were working before the swap).

Doing the cruise diagnostics I don't seem to have a speed sensor input, going over 25 MPH is supposed to make the cruise light in the gauge cluster flash on-off at a constant and even rate. Toyota TIS doesn't have squat for my truck and the FSM I found doesn't list any of the IH1/IH2/ECM connectors on the cruise diagram, and shows the cruise ECM as connecting to a speed sensor with only 2 wires (I'm presuming this is accurate for the speedo-gauge mounted VSS but not for my truck)

Anything else I should be looking at to try and fix this?

Innocent Fool

In my 90 SR5 the signal that runs the Cruise Control module is generated from the Speedo head unit. It is not the VSS line from the ECU.
The Speedo cable goes from the Transmission to the Speedo head unit. The Speedo head unit generates two pulses for each revolution of the Speedo cable 180 Degrees apart. That signal goes to the CC control unit to control the cruise based on the frequency of the signal. Not sure how it runs on the electronic speedo system

greenbuggy

On the 93 there's no cable between transmission and speedo head, its all electronic run off a VSS on the Tcase. I'm trying to use all factory speedo/cluster/cruise components out of the 93.

I suspect, but haven't had time to investigate that the problem is actually somewhere in the body harness since a lot of that got changed around when I made a conversion harness. I wish Toyota had better documented interconnection plugs

69sixpackbee

To elaborate a bit on this subject. The analog signal produced in the speedo head is a 4-pulse per revolution square wave DC signal. 12V hi/low 4-times per revolution. Not two as previously noted. The 2-wire type sensors mounted on the tail shaft are AC inductive sensors that produce a 4-pulse per revolution sine wave that goes into an A to D converter in the speedo heads of the compatible vehicles which operates those types of speedometers. That A.C. unconditioned signal is carried on to the ECU to handle the other functions as the ECU itself does the signal conversion. Then there are the 3-wire D.C. powered units that pulse the D.C. signal 4-times per second This is the one that more than likely was on your '93 and these plug into the corresponding correct speedo head.
On my '90 I ditched the POS vacuum assist cruise control in favor of the servo driven unit from a 2000 4Runner. It was an easy interface and did away with the relay and control box underneath the dash as this type of cruise control has the ECU integral with the unit itself. Pitched all of those valves and actuator in the trash can. I got it to play nicely with a 2-wire A.C. sensor mounted on the tail shaft of my A340H....another thing that most everyone said will not work behind the 5VZE-FE unless you ran a T-100 ECU. Hogwash!. Mine works fine. Gotta do your homework though and have a good grasp on Toyota electrical systems.

Innocent Fool

69sixpackbee: Have you got a write up on using the 2000 4Runner Cruise system?
Ditching the 90 vac system was my next project on the list. Its been giving me grief...

69sixpackbee

Look here:
https://www.yotatech.com/forums/f160.../#post52296399