Most common fuel pump diagnostic procedures in the past could be performed with a press ure gauge and a volt meter. Troubleshooting the fuelinjection system in the ford ranger can be a daunting task. Diagnostic flow charts repair guide print the following flow charts may be used to diagnose the causes of various trouble codes which may be recorded by. It is a fourday course facilitated by an instructor. Vw ve pump diagnostic troubleshooting hard start insufficient fuel supply, replace fuel filter one or more glow plugs bad or not getting power worn drive shaft support bushings in pump from over tightened timing belt water in fuel air leaks on suction side of fuel system injection pump needs. Misdiagnosis of fuel system components todays electronic fuel delivery systems are highly complex involving not only numerous fuel system components but other sensing devices that impact the vehicle performance. But dont immediately assume that the pump is the problem. Read free fuel injection diagnosis manual spider 124 multimeter to test fuel injector resistance ohms.
First and foremost the engine and fuel injection system must be free from vacuum leaks. Fuel system, fault diagnosis unsatisfactory engine performance and excessive fuel consumption are not necessarily the fault of the fuel. Some, however, use a vane type fuel pump mounted directly to the injection pumpfuel distributor assembly. Pdf injection diagnosis through commonrail pressure. It emphasizes diagnosis and troubleshooting, and features tech tips and diagnostic stories. Operation,diagnosis,and service 673 figure 297 the vacuummodulated pressure regulator controls system fuel pressure with a springloaded diaphragm.
In the strategy, features are firstly extracted from the individual cell. Fuel system overview below is an overview of fuel system operation the fuel system overview the purpose of the fuel system is to provide a mixture of fuel and air to the engine of the car. Fuel pump technical bulleti n for additional technical support, please call us at 6158386716. Fuel system diagnosis correctly diagnosing a low pressure. Automotive fuel and emissions control systems 2nd edition. The addition of fuel system enhancements, such as auxiliary fuel tanks or add on fuel filters. Fuel metering valve is free of any contaminates before. Prime the fuel system with the hand primer until 10. Stft and ltft values will be displayed by number e.
Remember, fuel trim data contained in either scanner freeze frame mode, or, that. With a lock type coupler, be sure to release the lock when disconnecting, and push in fully to engage the lock when connecting. The main difference between carburetor and fuel injection system carburetorzfuel is atomized by processes relying on the air speed greater than fuel speed at the fuel nozzle, zthe amount of fuel drawn into the engine depends upon the air velocity in the venturi fuel injection systemzthe fuel speed at the point of delivery is greater than the air speed to atomize the fuel. Now that we have an understanding of the fuel injection fuel control system, lets put it to work in repairing vehicles. To eliminate the chance of fire or personal injury, the fuel system pressure must be relieved before servicing any fuel system component. The mediumheavy composite vehicle control system is based on designs. Fuel system diagnosis fuel system description fuel is drawn by the supply pump through a prefilter screen in the tank and to the engine through the fuel supply lines. To accomplish this task, the fuel system must be properly maintained. The two questions that mechanics attempt to answer first, is there spark. Many of them use a fuel pump essentially identical to the carbureted fuel systems. The fuel passes through the base plate of the fuel injector control module ficm to cool the module. The fuel pressure specs very from manufacturer to manufacture so consult a service manual for exact specs. In fact they more commonly occur as a result of ignition and timing faults. Computerized powertrain controls diagnosis including obd ii 16 32% c.
Reading fuel injection diagnosis manual spider 124 is a good habit. For ignition system diagnosis and testing, please refer to the information on engine electrical components and ignition systems found earlier in this guide. The following is a guide for diagnosing fuel system difficulties. Learn why pressure without volume is a bad thing, how to diagnose cylindertocylinder airfuel imbalance, common problems with gasoline direct injection fueling and fuel injector failures. This input can be extremely useful in diagnosing intermittent fuel pressure problems that affect derivability. Fuel system diagnosis correctly diagnosing a low pressure, low volume or nofuel problem a lack of fuel to the engine may signal a failed fuel pump. Two conditions are essential for efficient operation of fuel system. Vacuum leaks are the leading cause of installation issues with your fuel injection system. The diesel engine is known as a compressionignition engine, while the gasoline engine is a sparkignition engine. Fuel pressure range 0 to 112 psi this input comes to the pcm from a pressure sensor on the fuel rail. Diesel fuel system diagnosis and repair diesel fuel system diagnosis and repair. Lead free gasolines to date, however, do not have the. If the trouble continues even after the trouble has been fixed with scan tool, must perform the fuel pressure test.
Fuel and fuel system microbiology fundamentals, diagnosis, and contamination control pdf by. Fuel systems and air induction systems diagnosis 8 16% e. With the fuel lines supply and return disconnected at the fuel tank and at the filterengine fuel filter removed, flush through the lines using clean diesel fuel in an effort to remove any remaining contaminated fuel and foreign material. Basic fuel system diagnosis introduction when there is a problem starting or driving a vehicle, two of the most important checks involve the ignition and the fuel systems. Fuel delivery system certain mechanical fuel injection systems also utilize a mechanical fuel pump, typically some early gasoline fuel injection systems. View and download kawasaki teryx 750 fi service manual online. Install the repaired fuel tank, the fuel filter and all fuel lines. How to troubleshoot the fuel injection for a ford ranger. Before acting on the following it is necessary to check the ignition system first. Learn how to check fuel injectors to make sure they are working. If the ignition system checks out there is spark, then you must determine if the fuel system is operating properly is there fuel. Basic diesel engine operation diesel engine force air by the intake valve into the cylinder high compression ratio heats the air enough to ignite the fuel fuel is injected into the cylinder at high pressure the amount of fuel injected suits to the load and controls engine speed. The aviation machinists mate ad is responsible for maintaining and.
The airfuel mixture must be in proportion to the speed and load placed on the engine. The injection event causes an instantaneous drop in the rail pressure, as the stored mass is diminished. In this paper, a datadriven strategy is proposed for polymer electrolyte membrane fuel cell pemfc system diagnosis. The fuel filter housing is on the suction side there is not a supply pump from the factory and are prone to suck air. Combustion engine diagnosis this book offers first a short introduction to advanced supervision, fault detection and diagnosis methods. Since the fuel injection system is all about the air, it will be necessary to calculate the volumetric efficiency ve of the engine see mark warrens june 2003 driveability corner for a concise explanation of ve. How to troubleshoot the fuel injection for a ford ranger by lee sallings.
Below schematic diagram shows the specifications of pressure, flow mass and temperature in fuel system. Fuel system diagnosis gasoline is volatile and vapors will settle in low areas, so work in a wellventilated space away from sparks or open flame such as a pilot light. High fuel injector return flow may cause fuel pressure control concerns. Modern diesel commonrail injection systems supply fuel from a highpressure vessel. Diesel engine and fuel system repair 5th edition will bonsalls essential guide to. This discussion will include a description of the principles, construction, and function of these two. This class will cover the use of fuel trims in the diagnosis of a variety of drivability problems and more. Understanding how the system functions makes this system easier to diagnose and repair. The two leading causes of electric fuel pump failure are. Chapter 4 jet aircraft fuel and fuel systems the purpose of the aircraft fuel system is to deliver a uniform flow of clean fuel under constant pressure to the engine under all operating conditions. Fuel injection system 4 connectorcoupler when connecting a connector, be sure to push it in until a click is felt. When ambient temperatures are below 0c 32f, the fuel tank pickup screen may be iced over from water in the fuel tank.
The right is reserved to make changes at any time without notice. The following diagnosis might be helpful if the vehicle exhibits the symptoms described in this bulletin condition engine misfire andor lack of power possibly due to waterdebris entering the fuel filler system and damaging the fuel system filters, injectors, supply pump, etc. The dealer enters the vin and the report is presented. Pdf fault diagnosis of pemfc systems in the model space. Diesel engine performance diagnosis introduction diesel engine performance diagnosis intro 2 june, 2006 this is the only instructorled course in the diesel engine performance curriculum. This course is designed to provide handson opportunities for technicians to learn and. Reference booklet this booklet is intended only for reference when preparing for and taking the ase electronic diesel engine diagnosis specialist l2 test. If you have a modern vehicle with a multiport or sequential fuel injection system, either the fuel pump isnt pumping fuel or the ecu isnt triggering the fuel injectors.
Comparison of fuel trim data for v type engines when the system utilises fuel system monitoring is a good way to see if a problem exists on one bank or is affecting both banks. There is no lift pump in the fuel tanks or on the frame. Follow the gm fuel system diagnosis in the service manual. On early import vehicles, the fuel pump was energized when the key was turned on and a vacuumoperated diaphragm regulated fuel pressure. Fuel pump diagnostics using scan tools know your parts. It then describes modelbased methods of fault detection and diagnosis for the main components of gasoline and diesel engines, such as the intake system, fuel supply, fuel injection, combustion process, turbocharger, exhaust system and exhaust gas. All information, illustrations and specifications contained in this manual are based on the latest product information available at the time of publication approval.
1086 261 861 253 272 1184 677 1122 389 430 680 790 42 1252 1037 68 52 1394 316 1326 1244 1210 624 217 362 923 18 1441 1175 1278 478 502 916 1383 349 113 549 1358 143 278