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A.S.T. Training Presents:

A.S.T. Training Presents:. Quick Check Diagnostics. What are the average shop’s dilemmas ?. No profit in driveability work. How to Diagnose today’s vehicles. High cost of equipment. Who should do driveability work. Charging for diagnostic time. Do I really want to do driveability work?.

melanie-mccoy
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A.S.T. Training Presents:

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  1. A.S.T. TrainingPresents: Quick Check Diagnostics

  2. What are the average shop’s dilemmas? • No profit in driveability work. • How to Diagnose today’s vehicles. • High cost of equipment. • Who should do driveability work. • Charging for diagnostic time. • Do I really want to do driveability work?

  3. Tonight’s Seminar Agenda • Discuss Necessary vs optional equipment. • Discuss hypothetical problem vehicles and gather current diagnostic procedures. • Discuss in detail, highly profitable, new diagnostic procedures. • Follow Quick Check Diagnostics Worksheets.

  4. Necessary Volt Ohm Meter Scan Tool Information Source Lab Scope Low Amp Probe Fuel Pressure gauge Automotive Common Sense Optional Ignition Scope Gas Analyzer Equipment

  5. Diagnostic Job #1 1999 Volvo Customer Complaint: Battery Goes Dead after 2 days of sitting. Service Manager: Charged customer 1 hour diagnostic time. This charge does not include repairing the vehicle. What would you do in your shop?

  6. 3 Possible Tests • Check TSB’s • Test Battery • Check For Drain on Battery What Else Would You Do?

  7. What Could Happen • Technician checks for drain on battery the conventional way by removing the negative battery cable and installing his amp meter in series with the cable and battery post. He finds an excessive draw and identifies the cause of the fault to be a faulty mercury switch inside the trunk, which keeps the trunk light illuminated. • Customer comes to pay his bill and pick up vehicle. • Vehicle will not start. • Vehicle gets towed to dealer to re-flash prom. Several hundred dollar charge is applied to you!

  8. Quick Check Test Several late model vehicles will have unwanted effects if we disconnect the battery cables. To perform a safe parasitic draw test, be sure to use an inductive low amp probe! Almost .6 amp drain

  9. Diagnostic Job # 2 1989 Buick Century Customer Complaint: Runs rough / No Power & Check Engine light on. Service Manager: Charges 1 hour diagnostic time and promises to call before repairs are performed. Technician: Found trouble codes 34 MAP sensor high & 45 Rich exhaust What would you do?

  10. Possible Diagnostic Steps • Diagnose trouble codes • Perform fuel and ignition system tests • Search for quick tips. (troubleshooter) • Perform engine mechanical tests Vacuum Compression Cylinder Leakage How long might this take ?

  11. Quick Check Tests Relative Compression Vacuum Waveform

  12. Diagnostic Job # 3 1992 Ford Taurus Customer Complaint: Intermittent cut out hot. Service Manager: Charges customer 1 hour diagnostic time, and tells you that the vehicle has been fine for several weeks now……. Technician: Hates service manager’s guts! What would you do ?

  13. Possible Steps • Drive car and park outside…no problem showing up. • Perform scan tool diagnostics • Hook up a bunch of equipment and drive or run vehicle until problem shows up. • Perform ignition and fuel systems conventional testing. • Guess at what is most likely the cause • Go home sick……

  14. Quick Check Tests Bad Fuel Pump Wave Current Ramping

  15. Lab Scope Tests Quick Check Tests

  16. Old Test Vs. New Test 2 wire hook up. 15 second test Labor Intense

  17. Conventional Test Vs. Quick Check Test Vacuum Gauge and Cylinder Leakage Tests. View intake and exhaust valves instantly

  18. Quick Check Tests Battery Drain We need to know if there is a drain on the battery, but if we disconnect the cable and use our amp meter, we may turn on some unwanted lights. What can we do? Attach your low amp probe around the negative battery cable. Remember to zero your probe! This calculates to over a half an amp drain, using the 10mv = 1 amp scale.

  19. Quick Check Test Primary Ignition Psychic Tech

  20. Real World Future Failures Ignition Module Troubles

  21. Fuel Pump Crystal Ball Bad Pump Good Pump

  22. Fuel Starvation Pressure Transducer If you think that your vehicle is running out of fuel, try using a pressure transducer. If you see a gradual decline all the way to a point of stalling then you are on the right track. What else can you use one of these for?

  23. Fuel Injector Problems Missing Ramp = Open Injector Abnormally High Ramp = Shorted Injector

  24. Secondary Pattern Quick Interpretations What does this mean ?

  25. “No Clue” Ignition Diagnostics 1-2-3-4-5-6 1-2-3-4-5-6 Spark Tester Installed Offending Cylinder

  26. Testing The Analog To Digital Converter Should Have A Steady-Flat Line TPS Harness: Reference/Return Shorted

  27. Diagnostic Approach • Listen to the complaint. • Formulate an attack plan. • Think like the PCM. { strategies } • Compile best diagnostic tests for problem at hand. • Check reference materials. Example: TSB & Silver Bullets • Follow analytical diagnostic procedure like the ones provided here. Capitalize on the power of your scope!

  28. Quick Check DiagnosticsChart # 1

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