1kz Ecu Pinout [top]

| Pin | Signal | |-----|--------| | C1 | AC1 (A/C request) | | C2 | A/C amplifier signal | | C3 | P/S pressure switch | | C4 | Stop lamp switch | | C5 | Brake pedal signal | | C6 | ECT (A/T ECU communication) | | C7 | TC (Diagnosis – check engine light control) | | C8 | W (Warning light – CEL output) | | C9 | MIL (Malfunction indicator lamp) | | C10-C22 | Grounds, power, shield grounds |

Connects to the Engine Coolant Temperature (ECT) sensor. The ECU alters fuel delivery and glow plug duration based on engine heat. 1kz ecu pinout

Check for +12V at the Spill Valve body. If power is present, probe the SPV pin at the ECU during cranking using an oscilloscope or test light to see if the ECU is actively pulsing the ground circuit. If there is no pulse, verify that the NE+ and NE- speed sensors are producing an AC voltage pulse during cranking. | Pin | Signal | |-----|--------| | C1

What is the printed on your ECU sticker (e.g., 89661-3D240)? If power is present, probe the SPV pin

Controls fuel injection timing by regulating internal pump pressure.

Often utilizes a 4-plug layout or a different pin density to accommodate advanced emissions and intercooling.

Signals the AC compressor clutch to disengage under heavy engine loads to protect the engine. Wire-Side vs. ECU-Side Pin Numbering