Get a Pinout diagram for the 1jz ECU. Find the pins for Solenoid 1, 2 and 3. Use a Multimeter to test the resistance of the solenoids. Hold the Negative lead from the multimeter onto a ground, so a piece of metal near the dash, then the positive lead you prick into the ECU pin. The resistance should be about 11 to 15 ohms if I remember correctly, you'll have to find a 1jz Workshop manual, but it should be the same, I had a 1g and I used the Supra MK3 TSRM, but about 11 to 15 ohms I think from memory.
If you have infinite resistance, then either
- Wiring going to the solenoid is severed somewhere
- Faulty Solenoid
- Bad Ground, the black coating on my solenoid mounting plate was causing a bad ground.
Other times it could be a bad solder joint, that is on the outside of the solenoid.
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