Toyota 4afe Ecu Pinout 'link' Jun 2026

| Pin | Wire Color | Function | Signal Type | | :--- | :--- | :--- | :--- | | A1 | Black/Red (B-R) | Battery Power (Constant +12V) | Power | | A2 | Black/Yellow (B-Y) | Main Relay (EFI Relay) Control | Output | | A3 | Black/Orange (B-O) | Injector #4 | Output (Ground switched) | | A4 | Black/White (B-W) | Injector #2 | Output (Ground switched) | | A5 | – | Not used | – | | A6 | Red/Blue (R-B) | ISC Valve (Idle Speed Control) – S1 | Output | | A7 | Yellow/Blue (Y-B) | ISC Valve – S2 | Output | | A8 | Blue (L) | ISC Valve – S3 | Output | | A9 | Yellow/Black (Y-B) | ISC Valve – S4 | Output | | A10 | White/Black (W-B) | ECU Ground (Power ground) | Ground | | A11 | Brown/Black (BR-B) | ECU Ground (Power ground) | Ground | | A12 | – | Not used | – | | A13 | Light Green (LG) | Injector #3 | Output (Ground switched) | | A14 | Light Green/Red (LG-R) | Injector #1 | Output (Ground switched) | | A15 | Red (R) | Check Engine Light (MIL) | Output (Ground switched) | | A16 | Yellow (Y) | Fuel Pump Control (to Circuit Opening Relay) | Output |

Wire colors and pin positions can vary by chassis (Corolla vs. Celica vs. Prizm) and market (USDM, JDM, EDM). Always verify with a multimeter before cutting or splicing. toyota 4afe ecu pinout

Toyota 4AFE ECU (also known as 89661-0A010 or 89661-13120) | Pin | Wire Color | Function |

Check for +12V at A01 and A02 (key ON). If absent, your EFI relay is dead or M-REL (C05) isn’t triggering. Always verify with a multimeter before cutting or splicing

To read codes: Jump pin A20 (TE1) to pin A22 (E1) with a paperclip. Turn ignition ON (do not start). Count flashes on check engine light.

For those performing swaps or repairs, identifying these specific wiring colors is common for the 4A-FE: