PAT


suppliers


aaaa logo

Member of Australian Automotive Aftermarket Association

PRTC Council Member

4WD Council Member



Latest News

Fuel Rail Sensors (FRS)

What a technician needs to know about diagnosing / testing and replacing the fuel rail pressure sensor on a Common Rail Diesel and Direct Injection petrol engine.

Typical Location for FRS:

Note:  The above Image indicates that the sensor is located at one end of the CRD fuel rail. Some earlier and later CRD systems utilise a PCM controlled pressure regulating device at the other end of the fuel rail.

Due to the variety of CRD fuel rail systems.
It is important to identify the correct device prior to any testing procedures. (FRS connector generally has 3 terminals).

(CRD) Sensor function.

The FRS is generally a piezo resistive type sensor that monitors the fuel pressure in the fuel rail as a varying voltage, which is utilised by the PCM as part of the calculation for the % duty cycle control for the Rail Pressure Control Solenoid (or Fuel Metering Solenoid or Suction Control Valve) to maintain a suitable rail pressure under all driving conditions. (current CRD systems now reach max pressures over 200MPa).

Sensor Operation:

The PCM supplies a stabilised 5 Volt supply to the signal wire of the sensor. A constant 5 V supply and a ground completes the pin out.

The resistive value of the sensor creates a change in voltage at the signal wire in accordance with the change in fuel rail pressure.

Typical CRD expected voltages: 

Example Bosch EDC 16 system.

Typical signal voltages from rail pressure sensor:

  • Engine stationary: approximately 0.5 volts.
  • Engine idling: approximately 1.32 volts.
  • Snap acceleration: approximately 3.77 volts +   

 

Effects of incorrect fuel rail pressure or a faulty CRD Fuel Rail Pressure Sensor on a vehicle:

  • Warning light illuminated.

An Incorrect fuel pressure signal for the driving condition will trigger the warning light and generally log fault codes.
Note: there may be multiple causes of an incorrect fuel pressure signal and the task for a technician is to determine if it is a pressure problem created by the fuel supply and regulating system or caused by a sensor fault.

  • Delayed or difficult starting engine.

Without accurate rail pressure signals the PCM cannot control the rail pressure as required and one result is starting difficulties.

  • Poor acceleration.

During acceleration the rail pressure should rapidly increase to ensure correct fuel amounts are delivered by the injectors. Unfortunately, with incorrect rail pressure monitoring, this pressure increase may not occur.

  • Engine stalling.

This may occur due to rail pressure fluctuations or insufficient or extreme pressures for the driving conditions.

  • Poor fuel economy

Rail pressure inconsistencies will cause incorrect mixtures and cause varying increases in fuel use. This will cause extreme variations in emission levels.

Caution: If the FRS is to be renewed, it is important to adhere to “all relevant safety procedures” as the fuel rail pressure may be extreme.

Error Codes:

Two common error codes relating to Fuel Rail Sensors on a CRD that may be logged are:

P0193 – Fuel Rail Sensor circuit high input. The PCM has detected that the fuel pressure is not within the predetermined range.

P0087 – Fuel Rail Pressure too low. Generally, a problem with the fuel delivery system that causes the pressure to be too low.

Even though the GDI (Gasoline Direct Injection) rail pressures vary to the CRD systems, the function of the rail pressure sensor is similar.

Typical Rail pressures for a GDI system may be:

  • From 500psi (3450KPa) @ Idle to approx. 3000psi (20,700KPa) at high engine load.

The Premier Auto Trade Sensors range includes Fuel Rail Sensors (FRS) from the world’s leading manufacturers, covering almost 200,000 vehicle applications in Australia and NZ.

When you supply and fit products from Premier Auto Trade you can expect a product designed and tested to the vehicle manufacturer’s specifications offering OE form, fit and function. Premier Auto Trade distributes products throughout Australia via a network of specialised resellers and leading automotive groups.






Latest News

Tech Tips - Wheel Speed Sensors (WSS)

Positive Crankcase Ventilation (PCV) and Oil Separators

Common Rail Diesel Pumps (HDP)

Exhaust Gas Temperature Sensor (EGT)

Hose Clamps

MAP Sensors (Manifold Absolute Pressure)

Electric Water Pumps

Pulse Width Modulation (PWM)

Mass Air Flow Sensors (Hot Wire/Film)

Petrol Fuel Injector Replacement

Electronic Throttle Bodies (TBO)

Dual Petrol Injection Systems – Technical Tip

Wheel Speed Sensors – More than just ABS

PAT Expands Emission Sensor Range

PAT Racing & Performance Injector Range Upgrade

Coils ain’t Coils!

ICON SERIES Range Grows

Oil Level and Oil Temperature Sensors Operation

Failed Air Temperature Sensors Symptoms

MAP Sensors Testing

TI Automotive Mustang Performance Pump

New ICON SERIES Hose Clamp Range

New Premium Sensors Ranges

Relay problems on vehicle

Test Equipment and Tools

Fuel Rail Sensors (FRS)

Failing Secondary Ignition

Testing Electric Fuel Pumps

Performance Fuel Rails and Filters

Testing CAM Angle Sensors (CAM)

Testing Electric Valve Solenoids (EVS)

Electronic Throttle Bodies

Performance Fuel Cells & Surge Tanks

Fault Finding Fuel Pressure Regulators (FPR)

Testing Variable Camshaft Actuators (VCA)

Testing Accelerator Pedal Position Sensors (APS)

Diagnosing Crank Angle Sensors (CAS)

Performance Regulators and Gauges

Differentiating Wheel Speed Sensors (WSS)

Mass Air Flow Sensors - Hot Film

Mechanical Fuel Pumps (MFP)

ICON Series Hoses

Particulate Matter Sensors (PMS)

Performance Fuel Injectors

Fuel Injectors (GDI)

DENSO Spark Plugs

Performance Fuel Pumps

Cooling Fan Switches (CFS)

Water Temperature Sensors (WTS)

Reverse Light Switches

Oil Temperature Sensors (OTS)

BMC Air Filters

Flasher Cans

Exhaust Pressure Sensors (EPS)

Power Steering Switches

Coolant Temperature Sensors (CTS)

Variable Intake Manifolds (VIM) and Intake Control Valves (ICV)

Oil Level Sensors (OLS)

Throttle Position Sensors (TPS)

Air Temperature Sensors (ATS)

Ignition – Condensers, Contact Sets, Distributor Caps and Rotors

Fuel System Accessories (FSA)

MAP Sensors (MAP)

Relays (REL)

HALL Sensors and Pickups (HAL)

Fuel Rail Sensors (FRS)

Speed Sensors (SPS)

New ICON Series Fuel Pump Range

New ICON Series Hose Range

Performance Range Increase Continues

PAT Oxygen Sensor Range Expands

PAT Expands Automotive Aftermarket Presence

Equipment and Tools

Electric Fuel Pumps (EFP)

Electric Valve Solenoids (EVS)

CAM Angle Sensors (CAM)

Ignition Modules (MOD)

Injector Service Components

Exhaust Gas Temperature Sensors (EGT)

Throttle Bodies

Knock Sensors

Ignition Coils

Fuel Injectors (Petrol)

Variable Camshaft Actuators (VCA) Oil control Valves

Accelerator Pedal Position Sensors (APPS)

Exhaust Gas Recirculation Valves (EGR)

Relocation of Sydney Distribution Centre

Wheel Speed Sensors (WSS)

High Tension - Ignition Lead Sets (ILS)

Suction Control Valves (SCV)

Mass Air Flow (MAF) Sensors

Crank Angle Sensors (CAS)

Fuel Pressure Regulators (FPR)

Oil Pressure Sensors

Exhaust Gas Oxygen Sensors

Shedding Light on Stop Light Switches

Ignition Distributors

Common Rail Diesel (CRD) Fuel Injectors

Idle Speed Control

New Distribution Centre Opening in ADELAIDE

New Distribution Centres Opening in PERTH and DARWIN

New Fuel Catalogue from Premier Auto Trade

BMC 4WD Air Filters Range Expands

New MVP Fuel Injector Range

PAT Developing Programs on Demand

New Premium Packaging for PAT

New Product Ranges Released By PAT

PlusQuip Test Equipment Range Expands

New Raceworks Catalogue

New Exhaust Gas Temperature Sensors

New Trade Catalogues from Premier Auto Trade

New Distribution Centre Opening in Adelaide

More European Parts from Premier Auto Trade

New PlusQuip Fuse Current Tester

PAT Pumped up!

Coils ain't Coils!

New PlusQuip Electronic EGR, Throttle Body, and Actuator Tester

New breed of High Performance products!

New Ignition Coil and Lead Set Kits

Wheel Speed Sensor Program Launched

Premier Ignition Lead Program Launch

Ignition Coils - Coils ain't Coils!

PlusQuip Battery Testers Launch

Premier Auto Trade Supporting Local Racing

Oval Trumpet Airbox (OTA) for 4WD applications from BMC Air Filters

BMC Air Filters NOW AVAILABLE from Premier Auto Trade

Premier Ignition Coils

MAP-013 and KNS-021 Now Back in Stock

BMC Air Filter partners with Premier Auto Trade

Premier Auto Trade opens South Australian Distribution Centre

Direct Fit Oxygen Sensor Range Hits 700

Automotive Electro-Mechanical Relays Types / Faults / Diagnosis

PlusQuip Tools and Equipment Launch

PlusQuip Fuel Line Repair Kit

PlusQuip Fuel Injector Service Kit

E85 High Performance with Premier Auto Trade

Testing EGR Systems (Pt 2)

New Delphi Fuel Module and Ignition Coil Range

Fuel Injector Service Components from Premier Auto Trade

Older News...

   privacy statement   terms of use   terms and conditions   sitemap   news  

© PremierAutoTrade