Copyright 2002AST Training A.S.T. Training’s Introduction to Driver’s Seat Diagnostics.
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Copyright 2002 AST Training A.S.T. Training’s Introduction to Driver’s Seat Diagnostics.
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Transcript of Copyright 2002AST Training A.S.T. Training’s Introduction to Driver’s Seat Diagnostics.
Copyright 2002 AST Training
A.S.T. Training’s
Introduction to Driver’s Seat Diagnostics.
Copyright 2002 AST Training
What is Driver’s seat diagnostics?
• What is drivers seat diagnostics
• What is needed to perform this
• Can anyone do this type of testing
Copyright 2002 AST Training
Equipment Needed
• Scan tool (s)• Lab scope • Your intelligence
Copyright 2002 AST Training
Where to begin
• Choosing an interface
• Mastering your scan tool
Copyright 2002 AST Training
6 Main Inputs
• The most important data stream parameters to understand are the following 6 main inputs. Temperature, Load, Demand, O2, Fuel trim and RPM.
• All systems rely on these!
Copyright 2002 AST Training
Temperature
• Coolant temperature
• Ambient temperature
• Air charge temperature
• Barometric pressure
Copyright 2002 AST Training
RPM
• Everything centers around this.
• It take approximately 3 seconds to set a code.
• This input is used in many PCM strategies.
Copyright 2002 AST Training
Load
• MAP• MAF• Vane Air Flow• Vacuum
Copyright 2002 AST Training
Demand
• Throttle position sensor.
Copyright 2002 AST Training
O2
• Oxygen sensor• Two types• Several strategies
Copyright 2002 AST Training
Fuel Trim
• Fuel trim• Short term• Long term• Integrator• Block learn
Copyright 2002 AST Training
Knock
• Test while cranking.
• Used to retard timing.
Copyright 2002 AST Training
Synchronization
• Crank re-learn• Set synch
Copyright 2002 AST Training
EGR Position
• Learn this value at idle.
• Look to see if open when commanded off.
Copyright 2002 AST Training
Future
• Multi-plexing• Re-flashing• Variable Valve
timing• Fuel content
analysis• Fuel pressure• Etc….
Copyright 2002 AST Training
What other modes?
• Failure records• Freeze frame• Mode six• Bi-directional
tests• Multi-plexing
Copyright 2002 AST Training
Failure Records
• Pass This Ignition Cycle
• Since Code Clearing
• DTC Monitor
Copyright 2002 AST Training
Freeze Frame
• Use this to qualify diagnosis process.
• Use to duplicate driving conditions while fault was present.
Copyright 2002 AST Training
Mode Six
• What is mode six ?
• Where is it located ?
• Will my tool do it?• How can this be
useful?
Copyright 2002 AST Training
Mode Six
• Real world example showing parameters.
Copyright 2002 AST Training
Misfire Counters
• Current Misfires• History Misfires• Put in Firing order
Copyright 2002 AST Training
Bi-directional tests
• Injector control• Fuel trim• EGR• EVAP• Ignition Coil• Cooling Fans• Relays• RPM• ETC…..
Copyright 2002 AST Training
Help Menus
• TSB• Connector
locations• Specifications• Schematics/pin-
outs
Copyright 2002 AST Training
Help Menus
• Code Tips• Symptom Tips• Prom Re-flashing• Yes the Snap-on
and OTC can do this.
Copyright 2002 AST Training
What else is out there
• P/C programs• Graphing
Copyright 2002 AST Training
Heads up stuff
• Chrysler• Strategies• Interpreted data
Copyright 2002 AST Training
Thank you
440-243-0503
Copyright 2002 AST Training
Copyright 2002 AST Training
Notes Page
Copyright 2002 AST Training
Check out some of our other products.
Be sure to visit our web sites at:
Sales: asttraining.comInformation:
asttraining.net
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