4afe reduced loom

[jeremiahnz]

Hi guys,

I know that for 4age's you can reduce the loom to minimal components for them to run - I was once told to as low as 5-6 wires....

I am looking to use a 4afe ECU and loom on a non Toyota engine and want to reduce the loom to as minimal as possible and presume some reduction is possible. For example my NZ new ae101 4afe wagon doesn't have an oxy sensor but I know jap imports do - so I assume that while an oxy sensor is preferable as it provides additional feedback to the ECU, that it isn't necessary. Similarly I assume that a knock sensor isn't required - the ECU will just assume that there is no detonation occurring as it isn't getting a signal.

If anybody knows what ECU inputs on a 4age or 4afe aren't necessary, please post them up.

Here is an ECU pinout for a 4afe as reference (I know it says 4E-fe in the image but the link says 4afe)


Any comments or opinions on how well engines with reduces looms run, or on whether any of my above assumptions are correct, are welcome.

Thanks in advance

[Crampy]

Quite often the ECU will set a fault code if a sensor isn't plugged in. So, it may need the knock seonsor and the 02 sensor.

[jeremiahnz]

Would a fault code mean that the ECU would run in limp mode, or does limp mode depend on what fault code is raised?

[Crampy]

Would a fault code mean that the ECU would run in limp mode, or does limp mode depend on what fault code is raised?

I don't think all fault codes put it in limp mode, but I'd say knock and 02 would do so.