Toyota 4A-FE ECU Pinout

Here is the deep text details regarding the .

Most 4A-FE ECUs use these primary terminals to manage engine operation: Ignition System : Ignition Trigger signal sent from the ECU to the igniter.

Critical Pin Functions Explained

The 4A-FE wiring harness is friendly for Megasquirt conversion. You can re-pin the factory ECU connector:

Are you troubleshooting a specific issue, like a no-start or poor idle, or are you planning an engine swap?

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| Pin # | Description | | --- | --- | | 4 | Engine Coolant Temperature (ECT) Sensor | | 5 | Intake Air Temperature (IAT) Sensor | | 6 | Throttle Position Sensor (TPS) | | 7 | Manifold Absolute Pressure (MAP) Sensor | | 8 | Crankshaft Position Sensor (CKP) | | 9 | Camshaft Position Sensor (CMP) |

AFM-based ECU (Type 1) differences:

  • Use the original +B and E01 wires for MS power.
  • Use NE+ and NE- for tach input.
  • Use the injector wires (B02-B05) to drive MS injector outputs.
  • Remove IGT and wire direct to the igniter.