If you have no spark and no injector pulse, check pin E5-5 (Black/Red). If this is dead with the key on, the EFI main relay is not engaging or the ECU is not pulling the relay coil to ground. Sensor Inputs (How the ECU Sees the World) The 1NZ-FE uses a Speed-Density system (MAP sensor) rather than a MAF, except for some California-spec models.
| Sensor | Connector | Pin | Signal Wire | Voltage/Spec | | :--- | :--- | :--- | :--- | :--- | | | E6 (B) | 23 | Light Green | 3.0-3.8V @ idle; ~1.0V @ decel | | TPS (VTA) | E6 (B) | 22 | Blue/Red | 0.5V (Closed) to 4.5V (WOT) | | Engine Coolant Temp | E6 (B) | 20 | Red/White | 2.5V cold to 0.2V hot | | Cam Position (VVT-i) | E6 (B) | 9 | Yellow | 5V square wave | | Crank Position (NE) | E6 (B) | 8 | White | 5V square wave | 1nz ecu pinout
The Toyota 1NZ-FE is the legendary 1.5-liter inline-four engine found in the Toyota Prius (Gen 1 & 2), Yaris (Vitz), Echo, Scion xA, xB, and the Japanese-market Toyota bB. While reliable, electrical gremlins or swap projects often require a technician to interface directly with the Engine Control Unit (ECU) . If you have no spark and no injector