Constant 12V from the battery to maintain ECU memory (trim values/codes).
The 2UZ-FE ECU (Engine Control Module) typically uses three or four large rectangular connectors, usually labeled (or A, B, C, D depending on the service manual).
A Comprehensive Analysis of the 2UZ-FE ECU Pinout: Unlocking the Secrets of Toyota's 4.0-Liter V6 Engine Control Unit
These are the most complex. They feature Variable Valve Timing, a plastic intake manifold, and often require a communication link with the instrument cluster and body control modules to function without "limp mode." Primary Pinout Categories
| Function | Typical Pin Location (Connector C) | Wire Color (Approx) | | :--- | :--- | :--- | | | Pin 1 (C) | White/Red | | Switched Ignition +12V (IG SW) | Pin 5 (C) | Black/Yellow | | Power Ground (ECU Main) | Pin 14, 15 (C) | White/Black | | Sensor Ground (Signal Return) | Pin 13 (C) | Brown |
If you grab an ECU from a junkyard without the key, transponder coil, and immobilizer box, the ECU will enter "security lock." You must send the ECU out to have the immobilizer disabled permanently.
provide early 2UZ-FE pinouts for aftermarket chip installations. 2006 Tundra
