Pins E5-25 and E5-26 must have a clean ground. If these are loose, the ECU will reboot randomly while driving.
Engine Control Wiring Diagram (Scribd) : High-level overview of the EFI and ignition circuits. 2uzfe ecu pinout
Crankshaft Position Sensor. The engine will not start without this sync signal. G2+: Camshaft Position Sensor signal. Pins E5-25 and E5-26 must have a clean ground
| Pin No. | Circuit | Function | Notes | | :--- | :--- | :--- | :--- | | | #10 | Injector Cylinder #1 | 12V Pulse | | 2 | #20 | Injector Cylinder #2 | 12V Pulse | | 3 | #30 | Injector Cylinder #3 | 12V Pulse | | 4 | #40 | Injector Cylinder #4 | 12V Pulse | | 9 | IGF1 | Ignition Confirm (Bank 1) | Feedback from Coils | | 12 | IGT1 | Ignition Trigger (Cyl #1) | Trigger Signal | | 13 | IGT2 | Ignition Trigger (Cyl #2) | Trigger Signal | | 14 | IGT3 | Ignition Trigger (Cyl #3) | Trigger Signal | | 15 | IGT4 | Ignition Trigger (Cyl #4) | Trigger Signal | | 24 | HT | Heated Oxygen Sensor | Bank 1 Sensor 1 | | 26 | THA | Intake Air Temp | Signal to ECU | | 27 | THW | Engine Coolant Temp | Signal to ECU | | 28 | STA | Starter Signal | 12V input when cranking | Crankshaft Position Sensor
