Toyota prius 3rd Gen Crankshaft Position Sensor (D27)
Toyota Prius 3 rd Generation (XW30)
Crankshaft Position Sensor Assembly Wiring Guide: DIY Pinout Diagram
OEM Crankshaft Position Sensor 90919-05070 for 3rd Generation Prius.
Crankshaft Position Sensor 90919-05070 for Toyota Prius 3rd Gen engine.
Toyota Prius 3rd Gen Crankshaft Position Sensor Assembly 90919-05070 installed.
1. Introduction
The Toyota Prius 3rd Generation Crankshaft Position Sensor Assembly (90919-05070) is a vital engine management component designed to ensure precise and efficient hybrid vehicle operation. This sensor continuously monitors the exact position and rotational speed of the crankshaft, providing real-time data to the Engine Control Module (ECM). Using this information, the ECM accurately controls ignition timing, fuel injection, and engine synchronization, which are essential for smooth engine startup and stable performance.
In the third-generation Prius, accurate crankshaft position sensing is especially important due to the interaction between the gasoline engine and the hybrid system. The sensor helps the hybrid control system determine optimal engine engagement, ensuring seamless transitions between electric and engine power modes. It also plays a key role in maintaining fuel efficiency, reducing exhaust emissions, and preventing engine misfires or rough idling.
Manufactured to Toyota’s strict quality standards, the 90919-05070 crankshaft position sensor offers high durability, heat resistance, and reliable signal accuracy under varying driving conditions. Its dependable performance supports overall engine reliability, making it an essential component for maintaining optimal Prius hybrid system efficiency and long-term vehicle health.
- Engine Control Unit (ECU / ECM) :- Receives signals from the sensor to control fuel injection, ignition timing, and engine performance.
- Camshaft Position Sensor :-Works together with the crankshaft sensor for precise timing of valve operation and ignition.
- Fuel Injectors :-Rely on ECU timing based on crankshaft position for proper fuel delivery.
- Ignition System:-Spark plugs and coils are triggered according to signals from the crankshaft sensor.
- Hybrid Control Unit (HCU):-In Prius, it may use crankshaft data for hybrid system coordination.
- Timing Components (Chain/Gears):-The sensor monitors crankshaft movement in relation to the timing system.
- Diagnostic Systems:-Onboard diagnostics (OBD-II) monitor sensor output and generate DTCs if faults occur.
2. Video Explanation (Quick Overview)
Crankshaft Position Sensor ensures accurate engine timing, smooth hybrid operation, improved fuel efficiency, and reduced emissions through precise crankshaft speed and position monitoring.
3. Crankshaft Position Sensor Assembly Wiring Diagram & Pinout
A. Connector Location
- Crankshaft Position Sensor Assembly Position:
- Connector Type:
- D14 (2 pin) Black housing
B. Wiring Table
Crankshaft Position Sensor (D27)
D27 TERMINALS OF Crankshaft Position Sensor CONECTOR
 |
|||
| Terminal No | Symbol (Pin Definition) |
Wiring (Color Code) & Color |
Electrical Paths |
|---|---|---|---|
| D27-1 | NE |
(B) Black |
|
| D27-2 | NE- |
(W) White |
|
4. Quick Pin Summary – D27 Connector
2-Pin Black Connector
-
D27-1
NE (Engine Speed Signal)
:
This pin carries the positive crankshaft position and engine speed signal from the sensor to the Engine Control Module (ECM). It generates an AC pulse signal as the crankshaft rotates, allowing the ECM to calculate engine RPM and crank angle. This signal is essential for ignition timing, fuel injection control, and hybrid system coordination. If this pin has an open or weak signal, the engine may misfire, stall, or fail to start. -
D27-2
NE- (Signal Return / Reference)
:
This pin acts as the negative reference (return) signal line for the crankshaft position sensor. It completes the sensor’s signal circuit and helps the ECM accurately interpret the NE signal. A fault on this line can cause unstable RPM readings, incorrect timing data, and DTCs such as P0335 or P0336. Proper continuity on this pin is critical for reliable engine speed detection.
Quick Note: The Toyota Prius 3rd Gen crankshaft position sensor (D27) uses a 2-pin connector. Pin D27-1 (NE) sends the engine speed and crank position signal to the ECM, while Pin D27-2 (NE-) serves as the signal return. Accurate signals from both pins are essential for correct ignition timing, fuel injection, and smooth hybrid engine operation.
5. DTC Error Codes Related to Crankshaft Position Sensor Assembly
These DTCs are commonly associated with crankshaft position sensor signal faults or engine speed detection issues in the Prius hybrid system.
| DTC Code | Description | Trouble Area |
|---|---|---|
| P0335 | Crankshaft Position Sensor "A" Circuit |
|
| P3190 | Poor Engine Power |
|
| P3191 | Engine does not Start |
|
Tech Tip: When diagnosing these codes, always inspect the crankshaft position sensor connector and wiring for damage or oil contamination before replacing components. A weak or unstable sensor signal can cause hard starting, poor engine power, or no-start conditions in the Prius. Clear codes and perform a test drive after repairs to confirm proper operation.
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