Toyota caldina GT 1997 I need position and description of ECU unit

SOURCE: 1997 Toyota Caldina GT-T 3S-GTE

Hi there,
As you say the tacho/speedo come "back up to normal" after the incident, I assume that they either stop working or become erratic while the dash lights are misbehaving.
If so, this sounds like a dash wiring electrical problem.
The O/D OFF light is lit by the switch on the shifter (switch also inputs to the ECU). The ENGINE light is driven also from the ECU but the SLIP light is driven from the ABS/VSC computer, although these two computers do communicate.
Best plan of attack would be interrogate the ECU for error codes or ask a Toyota dealer to do so. At least you'll have some clue to any problems that the ECU's may have picked up.
Contact me about checking for ECU error codes if you want to attempt it yourself. Although the Caldina has an OBDC2 connector, as I understand it it's not 100% compliant, so you'll need a Toyota compatible reader. Fortunately teh codes are also output via the CHECK ENGINE light.
If there's no problems there, I'd be pulling the instrument cluster and checking for wiring problems. I'm not sure where in the world you are but most ex- JDM vehicles could have modified with timers, speed-cut or fuel-cut devices that either have been poorly installed or are playing up and causing electrical problems.

SOURCE: Where can I get a free manual download for a 1997

http://pdfcast.org/download/toyota-corolla-manual.pdf

http://pdfcast.org/download/toyota-corolla-manual.pdf

click the above link for the manual