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Ok, the codes for the mk1 (and all toyotas of this era) are similar to those in the OBDII systems but there aren't nearly as many of them, and they aren't as specific. Even if your engine light is not on, codes may be present.
to check your codes, open your engine lid and find the diagnostics connector. its mounted on the back firewall. with the ignition off. pop the cover open and use a bent paperclip or a piece of wire or some other conductor to jumper between the E1 and T terminals.
go inside the car and turn the ignition to the on position but do not start the car. The check engine light will blink according to the codes that are present.
If the light just continually blinks there are no codes, but it there are codes there will be gaps in the blinks.
there is a 1.5 second gap between the first and second digit, a 2.5 second gap between codes, and a 4.5 second gap at the end of the codes. they will repeat as long as the ignition is on.
The BGB outlines how to test an ecu, but it isn't as simple as plugging in a scanner like on newer cars. It requires a lot of testing of voltages and resistances using a multimeter.
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