2uzfe Ecu Pinout Guide

| Symptom | Likely Pin Issue | | :--- | :--- | | No spark, no fuel | ECU not getting +B (switched 12v) or MREL signal | | Cranks, fires, dies (2 seconds) | Immobilizer active (Transponder missing) | | Runs rough, no MAF code | E2G ground (Pin 37) is floating or high resistance | | Radiator fan never locks | A/C pressure sensor circuit or Coolant temp sensor reading -40°F | | Transmission shifts hard | Throttle position sensor (VTA1) not communicating |

While this article provides the critical path, a full 70-page ECU pinout includes pins for: 2uzfe ecu pinout

To get the official Toyota Electrical Wiring Diagram (EWD): | Symptom | Likely Pin Issue | |

Avoid: "Universal pinout" posters on eBay. The 2UZ changed too much over its 13-year run. To get the official Toyota Electrical Wiring Diagram (EWD):

Connector faces viewed from the wire insertion side (pins facing you).