copyright 2002ast training a.s.t. training’s introduction to driver’s seat diagnostics
TRANSCRIPT
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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