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I want to thank all of you who have purchased my eBook and video lectures. Your response has been tremendously encouraging.

I am excited to announce that, beginning immediately, I will be partnering with YouTube to offer a subscription service which will provide access to all of my video lectures. In addition, I will post weekly videos from inside my classroom as well as other exclusive content.

These lectures were recorded over the 8 week period of my engine performance class at Rosedale Technical Institute in Pittsburgh PA.

I believe that you will find this lecture series, combined with my eBook to be exactly what you’ve been looking for, to take your knowledge to the next level. Thank you for your continued support.

Paul Danner (ScannerDanner)

*For more information on the variety of career training opportunities available at Rosedale Tech, visit

Section 1 "Universal Testing Methods" (313 minutes)

This is a great starting point for anyone because it provides a good foundation of testing methods to build on. Some highlights of this section: how to determine if an engine is running rich or lean, understanding fuel trim, vacuum leak and misfire diagnostics, how to address low power complaints, scope and scan tool usage, introduction to freeze frame data, how to perform a compression test with a scope and verify proper ignition timing, fundamentals of testing for voltage, amperage and resistance and common mistakes technicians make, alternator diode testing, pre-OBDII catalytic converter and exhaust back pressure testing. Also included in this section which is not in the eBook: waste spark ignition description, operation and common faults as well as transistor operation, a more detailed section on alternator diode testing with more than 5 different case studies, comparing a known bad with multiple known good patterns.

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Section 2 "Switch Inputs" (123 minutes)

Don’t let the title deceive you. This is anything but a topic on a simple switch. These are digital input signals to a computer and there are some fundamental design differences that will affect your ability to properly diagnose them. At the end of this section you will have a better understanding of how to test all mechanical and hydraulic input switches on any computer system (not just automotive) as well as operation and testing of Hall Effect sensors, optical pick-ups, digital MAF sensors, and communication problems between modules. The material in Sections 2 and 3 combined, applies in some way shape or form to the majority of all diagnostic processes that you will go through as a technician and is applicable to all makes, all models and all years of cars and trucks.

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Section 3 "Transistor Drivers and Output Solenoids" (130 minutes)

As with Section 2, the title can be misleading. In this section I am not simply describing how to test a simple solenoid. Every single power or ground side controlled component on the car will be tested the same way. Some examples would be electric motors, relays, lighting systems, fuel injectors, ignition coil primary controls and of course every single solenoid on the car ranging from transmission shift solenoids, to EGR and EVAP solenoids. Also covered in this section: how to test computer transistors (drivers), normally open and normally closed solenoids, pulse width modulation and duty cycle controlled solenoids. Once you learn and apply the concepts taught in this section you will find yourself troubleshooting and fixing even non-computer controlled circuits both on the car and even appliances around your home.

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Section 4 "Oxygen Sensors and Fuel Trim" (81 minutes)

In these next two Sections (4 and 5) we will expand our knowledge further on the workings of oxygen sensors and fuel trim. Section 4 covers more description and operation, and Section 5 deals more with component and wiring tests. Also covered in this section: O2 sensor amplitude and frequency, open loop and closed loop fuel control, advanced fuel trim diagnosis, EGR and A.I.R flow monitoring using an O2 sensor, O2 sensor abbreviations and locations, Block learn and Integrator binary fuel trim, what to do when ST and LT fuel trim contradict each other. I have had many requests for wideband O2 information. While that subject is not covered here, a lot of the principles still apply. Look for wideband coverage in the future.

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Section 5 "Oxygen Sensor Testing" (159 minutes)

This is a continuation of Section 4 and with more emphasis on the testing of oxygen sensors. Also covered in this section: causes of rich conditions (P0172 and P0175), causes of lean conditions (P0171 and P0174), what a false lean condition is and how to recognize it, a review of tailpipe gases and how we can use them in troubleshooting, wiring integrity testing using bias voltage and simulated O2 signals, why some O2 sensors operate with different voltage ranges, O2 sensor heater circuit monitoring and troubleshooting, catalytic converter testing (P0420 and P0430 codes). This section will also help those interested in taking the ASE L1 test as it is centralized around emission failures.

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Section 6 "Thermistors" (146 minutes)

As the name suggests, these are temperature sensing devices. They are used all over the car, in all different types of management systems. So it is critical to have a good foundation of circuit operation and design for proper troubleshooting of these types of sensors. If you understand how they work, then testing them becomes easy! And once you have adopted my testing methods for this type of sensor, you will never need another "engineer written flow chart" again for any thermistor circuit.

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Section 7 "Potentiometers" (100 minutes)

In this section I cover input sensors that measure position (potentiometers), with most of the emphasis on a throttle position sensor (TPS). I cover description and operation as well as common faults and symptoms that a faulty TPS can cause. As I walk you through detailed operation and testing of the TPS, you will learn that all potentiometers operate and are tested the exact same way! You will learn foundational information that will enable you to never have to rely on a manufacturer flow chart again when checking any type of potentiometer. When it comes to troubleshooting, it is imperative that you have a complete understanding of operation and testing of a potentiometer as you will find them throughout the car, on multiple different systems. The following is a list of some of the sensors you will be able to test with no problems after following the testing methods in this section: throttle and EGR position, transmission range, steering angle, accelerator pedal (part of electronic throttle control systems), electronic suspension ride height, climate control mode door position and some control panel inputs.

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Section 8 "Pressure Sensors" (68 minutes)

This is another foundational topic. Covered in this section is the description, operation and testing of all types of pressure sensors, with the main focus being on the MAP (manifold absolute pressure) sensor. There is a lot of confusion in this field as to when a MAP sensor needs to be replaced. What I have found is most MAP sensor trouble codes are not caused by a faulty MAP sensor! After viewing this section you will be able to be 100% confident when troubleshooting MAP related trouble codes. No more guessing! As with other input sensors, once you understand how to test a MAP sensor you will find that all other pressure sensors on the car are tested the same way. Examples of other pressure sensors that you will be able to competently test: fuel tank pressure sensors, fuel rail pressure sensors, Ford PFE and DPFE sensors, AC system pressure sensors, power steering pressure sensors, and barometric pressure sensors.
Some other topics covered: What is a speed density system? How does a Ford DPFE sensor work and how do you test it? What is the most common cause of EGR flow trouble codes?

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Sections 9, 10 and 11 "Supports Sections 6-8" (75 minutes)

These three sections I use as supporting material for thermistors, potentiometers and pressure sensors.
In Section 9, "The 5v Reference Circuit", I cover the following: which inputs can share this circuit and which ones cannot, how knowing circuit design enables you to better read wiring diagrams, how a shorted 5v reference circuit can cause a no-start, how to determine if one of the inputs are shorted and pulling the reference circuit to ground.
In Section 10, "Signal Circuit Integrity Testing" I expand on this topic which is discussed in Sections 6 and 7, showing other ways it can be done, both with and without scan data. I also show that this type of testing can be done on other types of input circuits using a knock sensor as an example.
In Section 11, "Substituted Values" I discuss yet another variable we need to consider when troubleshooting any input sensor and that is, the scan tool can lie to you! Scan data parameters can be substituted and if one ignores this fact, misdiagnosis will occur and signal circuit integrity testing can have misleading results.

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Section 12 "Airflow Sensors" (152 minutes)

Covered in this section are detailed description, operation and testing of some of the main types of mass airflow sensors that you will see in the field. Starting with vane airflow sensors, I show how our previous knowledge of potentiometers and thermistors apply to testing of this new component. I also take an opportunity to discuss the keys in reading a wiring diagram using a Toyota fuel pump circuit that uses a VAF sensor. Next I discuss hot-wire type mass airflow sensors, both analog and digital types, with an emphasis on proper testing methods.

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Section 20 "Idle Speed Controls" (139 minutes)

In this Section, I cover the operation and testing of solenoid and stepper-type idle speed control motors. Once these fundamental principles are applied you will find that even electronic throttle control systems follow the same guide lines and have similar testing methods. I also cover the inputs that are involved with idle speed controls and show that most idle speed control problems have nothing to do with IAC motor itself. Some other topics covered: Why does a dirty throttle body cause stalling problems? What is minimum idle speed and what is the proper way to restore it? What is a cold-fast idle device and how does it change your approach to diagnosis of idle speed problems? What is a duty cycle controlled solenoid? What are the testing differences between a 4-wire and a 6-wire stepper motor?

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Sections 13, 14 and 15 (187 minutes)

In these next three sections we begin to build the foundation for fuel injector and fuel pump testing. These fundamentals are applicable to all systems.

Section 13 "Types of Fuel Injection"
Some of the material covered in this section: TBI and MPFI systems, mechanical and electronic fuel injection, GM CPI systems, manifold tuning valves, and injector sequencing.

Section 14 "Fuel Delivery Designs"
The purpose of this section is to provide an understanding of how the fuel gets from the tank to the fuel rail. Three main designs are covered: mechanical return, mechanical returnless and electronic returnless fuel systems. Along with these system descriptions I cover all of the components involved, from fuel pressure regulators to fuel rail pressure sensors. This section will provide you with a better understanding of the causes of too high/ too low fuel pressure as well as bleed down problems, and will make you much more accurate in your diagnosis of fuel delivery problems.

Section 15 "Fuel Pump Electrical Circuits"
As the title suggests, I will be covering all different types of fuel pump controls, with the primary focus being on how the fuel pump operates and where it gets its power from. An understanding of these systems is a must to properly troubleshoot no or low fuel pressure problems. Within this section I will also teach you how to better read wiring diagrams.

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