Input from the coolant temperature sensor for fuel enrichment.

The is more than a wiring diagram—it is a survival guide for keeping these charismatic kei vehicles on the road, especially when they are hot . Focus your efforts on the 5V reference, power grounds (E01/E02), and coolant temperature sensor signal. If you experience a heat-related failure, remember: capacitors are cheap, and Toyota’s old Denso ECUs can be repaired.