Automotive Training


    Denso Common Rail Systems (DMS1-3)

    Quick Facts
    Course ID: DMS1-3
    Duration: 2 Days

    Prerequisites: From our experience we advise that the diagnostician has completed the Automotive Electronic Diagnostic (AED) (It is not necessary to have completed DMS 1-1/DMS 1-2).

    In this seminar, Denso common rail system is covered in great detail. The Mitsubishi 4M41 CR engine management system with the HP3 injector pump is used as the base for this training. Other systems are also covered. Upon completion, you will have an understanding of the systems with a wide comprehensive view with in-depth electronic and mechanical system-specific diagnostics.

    Following are some of the topics covered:

    1. Coiled CR Injectors. The mechanical construction, the response speed, common faults like rattely engine and high voltage shot opening.

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    2. Piston movement, pressure graph. The most important part of diagnosing Common Rail Diesel is understanding the combustion process properly. This section explains why each sensor is an integral part of the system and makes logic to which sensor to go first when trouble erupts.

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    3. Injection timing. What sensors are affecting CR injection timing and how do you measure if the timing is actuially correct.

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    4. High voltage and high current. How is the high voltage made in the ECU or in the injector driver. How is the injector driver activated and how do you test these items. What is the significance of the inclination of the current graph.

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    5. Sensors. We look at the signals produced by each sensor in the system, what the signal should look like and common faults. What level of induced injector interference is acceptable on which sensor.

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    6. relation between SCV (and PDV) and rail pressure. The suction control valve and pressure dischage valve have a very important role, to diagnose you need to look at the relation between the valves and rail pressure sensor. We use several diffrent methods to make it instantly visible to determine where a fault is.

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    7. Throttle body and EGR control. We look at how is the throttle and EGR valve controlled, why are they there and what are the most common faults.

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    8. VNT turbo. Through display models and theory we look at the operation and control of the turbo. Common faults and how to recognise this with your tools.

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    9. Cat and DPF. The whole exhaust system of even the most simple ute is very complex with many items that need maintenance and care. What goes wrong, what can you do to correct issues.

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    During the training seminar measurements will be made on most components. The explanations are clear and straightforward to understand. A comprehensive 95 page manual will be yours.
    Individual component testing and understanding will become easy and the role and effect of each component in the overall system will be fully understood.

    Successful completion of this course will result in gained knowledge and experience in
    • All popular common rail diesel engine management systems (emphasis on Denso).
    • Diagnosing current faults, preventing and finding looming faults.
    • Approach systems with a wide, comprehensive view with in-depth electronic and mechanical system specific knowledge.
    • Finding drivability problems and satisfying customer demands in a minimum of time.
    • Measuring and comprehending all the system's electronic signals.
    • The mechanical and electronic workings of all the common rail system components.

    It is suggested that you bring your own scan tool and scope, or one of our ATS Scopes. See more about ATS Scopes

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    After Kevin from Northland Toyota attended the DMS13 training seminar in Palmerston North (16 06 2011).
    Kevin wrote as comment in the evaluation form that as most value to him was: "Injection duration and timing control. A well worthwhile course to go on."