6-Pin Common Rail Pressure & Electronic Injection Wire Harness Connector – Female OEM

This 6-pin female connector is used in diesel common rail fuel system harnesses, integrating rail pressure sensor, fuel temperature sensor, and electronic injector control circuits in a single connector. The 6-pin configuration is used in common rail direct injection (CRDI) systems where multiple fuel system sensor and actuator circuits are consolidated into a single harness connector. Available bare or with 15cm pre-wired leads.

Key Specifications

• Pin count: 6-pin
• Gender: Female
• Housing material: High-temp nylon (PA66)
• Available as: Bare connector or 15cm pre-wired leads
• Application: Common rail pressure sensor, electronic injection harness

6-Pin Common Rail Circuit Assignment

• Pin 1 (VREF): 5V sensor reference voltage
• Pin 2 (SIG1): Rail pressure sensor signal output
• Pin 3 (GND): Sensor ground
• Pin 4 (TEMP): Fuel temperature sensor signal
• Pin 5 (INJ+): Injector solenoid power (+12V)
• Pin 6 (INJ−): ECU-controlled injector ground (pulse width modulated)

Common Rail System – Why Connector Integrity Is Critical

Common rail diesel systems operate at injection pressures of 1,600–2,500 bar. The rail pressure sensor monitors this pressure in real time, and the ECU adjusts the high-pressure pump and injector timing based on the sensor signal. A corroded rail pressure sensor connector causes the ECU to receive an incorrect pressure signal, leading to:

• Limp mode activation (ECU defaults to safe fuel delivery map)
• Excessive smoke (over-fuelling from incorrect pressure reading)
• Hard starting or no-start (under-fuelling from incorrect pressure reading)
• DPF regeneration failure (incorrect fuel delivery affects exhaust temperature)

Fault Codes This Connector Fixes

• P0087: Fuel Rail Pressure Too Low
• P0088: Fuel Rail Pressure Too High
• P0191: Fuel Rail Pressure Sensor Circuit Range/Performance
• P0192: Fuel Rail Pressure Sensor Circuit Low Input
• P0193: Fuel Rail Pressure Sensor Circuit High Input
• P0201–P0208: Injector Circuit Faults (cylinder-specific)

Frequently Asked Questions

Q: My diesel goes into limp mode with P0087 — is this the connector?
A: P0087 (fuel rail pressure too low) can be caused by a faulty high-pressure pump, clogged fuel filter, or a corroded rail pressure sensor connector. Check the connector first — it is the least expensive repair. Clean the connector pins with electrical contact cleaner and re-test before replacing the high-pressure pump ($400–$1,500).

Q: Are terminals included?
A: Yes, terminals are included with all variants.