VehicleFitment/Toyota (2015-01-01 07:00:00)

Information on the Toyota 4age timing system - distributor driven. These have a potential market for Corolla (AE86 and newer, and MR2)

http://www.autoshop101.com/forms/h23.pdf

Some decent scope traces.

http://www.jamesmccombe.com/tube/Cars/MR2/ImageLibrary/Thumbnails/Drivetrain/EngineManagement/DistributorTesting/ContactSheet.shtml

two ways I would do it

1) use is in 'coil type trigger' mode any only use the G signal

OR

2) grind off one of the teeth on on the 24 tooth wheel and run 24-1 and only use Ne signal

Sounds like a simple setup:

This way we get a similar crank and crank-signal pulses to the processor as the HALL signal of the mazda-BP engine (eg. MembersPage/Fero ) has by default (without LM1815 of course).

Any info about the position of primary trigger falling edge ? If it's >50 crankdegrees BTDC, than it is supported without any firmware modification.

Here's a diagram of the type of trigger found in European and JDM Toyota 4A-EG engines.

Toyota4AEGSignals.gif

This would be a good one to get working as there are a large number of these engines used in Motorsport, apart from Toyota MR2, Corolla and Tureno these engines are used in Mk1&Mk2 Ford Escorts as they are the same as the Cosworth BDA engine.