Post on 01-Jan-2016
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
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Equipment Needed
• Scan tool (s)• Lab scope • Your intelligence
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Where to begin
• Choosing an interface
• Mastering your scan tool
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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!
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Temperature
• Coolant temperature
• Ambient temperature
• Air charge temperature
• Barometric pressure
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RPM
• Everything centers around this.
• It take approximately 3 seconds to set a code.
• This input is used in many PCM strategies.
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Load
• MAP• MAF• Vane Air Flow• Vacuum
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Demand
• Throttle position sensor.
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O2
• Oxygen sensor• Two types• Several strategies
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Fuel Trim
• Fuel trim• Short term• Long term• Integrator• Block learn
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Knock
• Test while cranking.
• Used to retard timing.
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Synchronization
• Crank re-learn• Set synch
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EGR Position
• Learn this value at idle.
• Look to see if open when commanded off.
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Future
• Multi-plexing• Re-flashing• Variable Valve
timing• Fuel content
analysis• Fuel pressure• Etc….
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What other modes?
• Failure records• Freeze frame• Mode six• Bi-directional
tests• Multi-plexing
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Failure Records
• Pass This Ignition Cycle
• Since Code Clearing
• DTC Monitor
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Freeze Frame
• Use this to qualify diagnosis process.
• Use to duplicate driving conditions while fault was present.
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Mode Six
• What is mode six ?
• Where is it located ?
• Will my tool do it?• How can this be
useful?
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Mode Six
• Real world example showing parameters.
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Misfire Counters
• Current Misfires• History Misfires• Put in Firing order
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Bi-directional tests
• Injector control• Fuel trim• EGR• EVAP• Ignition Coil• Cooling Fans• Relays• RPM• ETC…..
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Help Menus
• TSB• Connector
locations• Specifications• Schematics/pin-
outs
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Help Menus
• Code Tips• Symptom Tips• Prom Re-flashing• Yes the Snap-on
and OTC can do this.
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What else is out there
• P/C programs• Graphing
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Heads up stuff
• Chrysler• Strategies• Interpreted data
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Thank you
440-243-0503
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Copyright 2002 AST Training
Notes Page
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