For those performing swaps or repairs, identifying these specific wiring colors is common for the 4A-FE:
If your 4A-FE engine lacks spark or fuel, the ECU pinout is the first place to check with a digital multimeter.
The rain drummed against the corrugated metal roof of the garage, a steady, rhythmic beat that matched
This article provides the most detailed, verified pinout data for the most common 4A-FE ECUs, including the 1990-1994 “square plug” and the 1995-1998 “round plug” (OBD-II variants). By the end, you’ll understand every wire, sensor, and actuator connected to your 4A-FE ECU.
Main computer grounds connected to the engine block or chassis.