Toyota 4afe Ecu Pinout | Recommended & Updated

Injector pulse signals. (The 4A-FE often uses "batch" firing where injectors are triggered in pairs).

Once I have those details, I can provide a specific pin-by-pin chart for your exact harness.

Ensure 12V is present when the key is in the "On" position. toyota 4afe ecu pinout

Use an oscilloscope or multimeter to check for a pulse while cranking. No NE signal means no spark or fuel.

When testing a running engine, slide your probe into the back of the connector rather than piercing the wire insulation. Injector pulse signals

Always pull the negative terminal before probing ECU pins.

Below are the most critical pins you will encounter when wiring or troubleshooting. Note that colors may vary slightly by year, but pin locations generally remain consistent within specific generations. 1. Power and Ground Signals These pins ensure the ECU turns on and stays grounded. 12V Switched Power (from the EFI main relay). BATT: Permanent 12V Power (for memory/fault codes). Ensure 12V is present when the key is in the "On" position

The signal from the MAP sensor. THA: Intake Air Temperature sensor signal. THW: Coolant Temperature sensor signal.