Differences between 1988 and 1989 3FE ECU (1 Viewer)

[Bryan062087]

Hi,

I recently had 2 codes indicating that my computer on my 1989 FJ62 was bad. I replaced the computer today with one from a 1988 FJ62. The part number of the ECU I took off differed from my used replacement part. 89661-60020 (1988) and 89661-60021 (1989).

Everything connected up fine and the engine no longer shows any codes in diagnostic mode.

Does anyone know if running an 1988 ECU in a 1989 3FE will cause any issues? What are the differences between the ECU's other than the different part #'s?

Thanks.

 

[3_puppies]

I don't think there are any differences to worry about. the later 80 series 3fe uses a different computer, different plugs.

 

[TobyB]

There seem to be 2 different color connectors- if you have the same color connectors on the ECU and your harness,
you're golden.

That said, I don't know that crossing the colors (grey and yellow, maybe?) would matter.

Yes, from what I could find, the ECU changed for 89, and then the FJ80's ecu used a different pin configuration altogether.
That said, there only seems to be one 62 efi schematic, so...

t

 

[Cruiserdrew]

I thought the California specific trucks have yet another ECU, that takes the input from the EGR temp sensor, which 49 state trucks do not have.

 

[Bryan062087]

Thanks for the replies. The color of the receptors are different in fact different than the computer I took off. The wire connectors are grey and so were the old ECU's receptors. New receptors (on the replacement ecu) I'm pretty sure are a different color. Perhaps green. I'll check tomorrow.

I looked up the part numbers on toyodiy and I saw two separate computers for CA spec models. Neither of the ECU's had I had were the CA spec.

 

[ccasteel]

So was this confirmed? Are the ECU's interchangeable? I bought a replacement engine harness that came in with the grey plug(89/90). But my ECU is yellow(88). After changing the two different style connectors for the cold start injector switch and the water temp, am I good to go?

 

[4Cruisers]

89661-60011 (2/88-1/90) is an analogue to 89661-60010 (8/87-2/88), so they are functionally the same. Likewise, 89661-60021 (2/88-1/90) is an analogue to 89661-60020 (8/87-2/88). The ECU in my CA-spec January 1989 FJ62 is 89661-60011.