1990 Geo Prizm

Did you have a check engine light come on or has flashed prior to this problem and when was your last tune-up?

Cranks but no start condition:

Fuel and Spark:
Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.

Check for power at the coil positive terminal black and orange wire also do you hear the fuel pump come On?

Inspect and test the circuit opening relay or swap with a like one and also check for power at the injector harness black and orange wire-

Go to junk yard and pull both large and small fuse boxes from doner car. They unbolt and pull connectors to them (squeeze tabs and pull).

These are good to have on an older Prizm. The replacement relays can only be purchases from Toyota and they are not cheap.

Toyota Corolla or Geo Prizm from 90-92 are same.

I have a 91 and have 2 sets of the fuse boxes. Cost me $10 each.