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