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Your Partners for the Road Ahead!

NEXTECH. and. Carman Scan VG. Your Partners for the Road Ahead!. What is the advantage of a Combination Data Scanner / Oscilloscope over a basic Data Scanner?. A basic Data Scanner can perform the following functions:. Read and Erase Fault codes.

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Your Partners for the Road Ahead!

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  1. NEXTECH and Carman Scan VG Your Partners for the Road Ahead!

  2. What is the advantage of a Combination Data Scanner / Oscilloscope over a basic Data Scanner? A basic Data Scanner can perform the following functions: • Read and Erase Fault codes • Display Current Data to verify a fault exists. • Perform Actuation tests. However, determining whether a fault is caused by a component failure, a wiring fault or a faulty ECM requires more than just a Scanner. The Carman Scan 1 and Carman Scan VG provide the technician with a complete solution for Diagnostics.

  3. The use of an Oscilloscope is a necessity for pinpointing vehicle faults. During the course we will be studying the operation of the VG as well as the correct procedures required for testing a number of common components.

  4. THE CARMAN SCAN VG TRAINING COURSE #1 OSCILLOSCOPE TRAINING

  5. THE OSCILLOSCOPE

  6. % Hz m/s 8v 6v VOLTAGE 4v 2v 0v TIME Hz = Frequency (Number of Pulses per second). % = Duty Cycle (On/Off Ratio). m/s = Time measurement.

  7. The Lab Scope is one of the most valuable diagnostic tools available to the modern workshop today. • It is commonly used to check: • Supply voltage • Voltage Drops (in power and earth circuits). • AC Waveforms • DC Waveforms (Square waves etc.) • Pulse Signals

  8. TYPICAL AC WAVEFORM + v 0 v - v AC Waveforms are generated from such devices as: Alternators (before rectification) Crank Angle Sensors TDC Sensors Vehicle Speed Sensors Transmission Pulse Generators

  9. TYPICAL SQUARE WAVEFORM OFF 5 v GROUND SWITCHED SIGNAL Duty Cycle 50% 0 v ON ON 5 v POSITIVELY SWITCHED SIGNAL Duty Cycle 50% 0 v OFF Square Waveforms are commonly used for inputs such as: Crank Angle Sensors, Camshaft Sensors, TDC Sensors, Vehicle Speed Sensors, MAP Sensors (Ford), Air Flow Sensors or outputs such as Idle Speed Control Motors

  10. TYPICAL PULSE WAVEFORM VOLTAGE SPIKE SOLENOID PULSE SIGNAL 12 v 0 v Typical Solenoid Pulses include: Injectors; Canister Purge Solenoids etc.

  11. SECONDARY IGNITION OSCILLOSCOPE

  12. Typical Secondary Ignition Patterns

  13. Secondary Ignition Specifications Ionization (Peak)Voltage Decay Section Burn Voltage Dwell Burn Time Specifications – Idle, No load Ionization (Peak)Voltage – 7-15 KV Burn Voltage – 1-2 KV Dwell – Depends on RPM Burn Time – 1-2 m/s

  14. Carman Scan VG Oscilloscope Operation

  15. Selecting Secondary Ignition

  16. Selecting Secondary Ignition Touch the “OSCILLOSCOPE” Icon.

  17. Selecting Secondary Ignition Touch the“Ignition Waveform” Icon.

  18. Selecting Secondary Ignition Select the number of cylinders to be tested.

  19. Selecting Secondary Ignition type Select the type of Ignition and the approximate idle speed.

  20. Selecting Secondary Ignition firing order Select the correct firing order from the list or make a new one using the numbers in “other”.

  21. Selecting Secondary Ignition Probe Type Press “SAVE” when completed Select the correct probe. E.g. “1 to1” when using a single probe, or “1 to 3” / “1 to 4” for Multi-Probes (DLI Ignition etc.)

  22. Special Note: DLI Vehicles Conventional Ignition vehicles are normally “Negative” firing, and, therefore, the spark plugs fire from the centre electrode to the outer electrode of the plug. On DLI, Waste Spark vehicles, half of the cylinders are “Negative” firing, and therefore fire from the centre electrode to the outer electrode of the spark plug, whilst the other half of the cylinders (their mating cylinders) are “Positive”, firing from the outer electrode to the centre electrode. Please refer to the following diagram.

  23. Distributor-less Ignition Operation Electron Flow

  24. Conventional Ignition When connecting the VG to a conventional Ignition Vehicle, the Secondary Ignition pickup lead is connected to Channel 2 of the VG and the #1 Trigger lead is connected to Channel 3 DLI Waste Spark Ignition When connecting the VG to a DLI Vehicle, the “Positive” cylinders are connected to Channel 1 and the “Negative” cylinders, connected to Channel 2. The #1 Trigger lead is connected to Channel 3 as usual.

  25. Determining the Positive and Negative firing cylinders If unsure which cylinders are Positive firing and which are Negative firing, simply take ONE secondary pickup lead and connect it to Channel 1 or Channel 2 of the VG. With the engine running, place the secondary pickup lead around one cylinder at a time. Any cylinders that produce an ignition pattern facing up the correct way on the scope are the correct Polarity for that channel. Any cylinders displaying an upside down pattern are incorrect polarity and therefore belong the the other Channel. Please refer to the following diagrams.

  26. Correct Polarity for the channel selected. Correct Polarity. Note, the Ignition pattern is displayed the correct way up.

  27. Incorrect Polarity for the channel selected. Connect this Cylinder to the other channel. Incorrect Polarity. Note, the Ignition pattern is displayed upside down.

  28. Demonstration here of determining correct Polarity

  29. SPLIT SCREEN (Default Screen) = Parade + Single Cylinder Note: This is aWaste Spark DISvehicle. Mating Cylinders are: 1&4; 3&6; 5&2.

  30. Screen Settings

  31. Screen Settings Sets the “Voltage Scale” for the Parade and Single Cylinder Patterns. Sets the “Time Base” for the Parade Pattern only. Sets the “Trigger Level”.Adjust whenever Patterns are erratic or Cylinder #’s are erratic or missing. Allows the user to select which SingleCylinder willbe displayed on the screen. Allows the screen to be changed to display the patterns as either: “Series”(Parade), “Single Cylinder”, “Trend Plot” or “3D”. Turns the “Information” display on or off.

  32. Demonstration here of effects of incorrect Trigger level

  33. Selecting a new “Single Cylinder” to be displayed To Select a new single cylinder, press“CYLINDER”,then press the cylinder #

  34. Selecting a new “Single Cylinder” #6 Selected To Select one of the other two cylinders, press“MORE”.

  35. Selecting a new “Single Cylinder” #3 Selected Selecting other Cylinders for display.

  36. Demonstration here of Selecting a New Single Cylinder for Display

  37. Changing Screen Displays

  38. Selecting new screen displays To select new screen displays, Touch“SCREEN”

  39. “Series” (Parade) Selected Touching “SERIES” displays the above Pattern

  40. “Single Cylinder” Selected Touching “CYLINDER” displays the above Pattern

  41. Selecting a New Single Cylinder

  42. “Single Cylinder” Selected To display a different cylinder, press and then press “CYLINDER”.

  43. Selecting a new Single Cylinder After pressing“CYLINDER”, press the “Cylinder #” required.

  44. Selecting a new Single Cylinder To select a new cylinder, Touch the cylinder # required.

  45. Trend Plots

  46. “Trend” Selected Cylinder #’s Peak Voltage “Peak Voltage” for each cylinder is being displayed on the right

  47. “Trend” Selected Dwell “Dwell Time” for each cylinder is now being displayed on the right

  48. “Trend” Selected Burn Voltage “Burn Voltage” for each cylinder is now being displayed on the right

  49. “Trend” Selected Burn Time “Burn Time” for each cylinder is now being displayed on the right

  50. 3 Dimensional Raster Patterns

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