Ford EEC IV
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Ford EEC IV

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Ford EEC IV Ford EEC IV Presentation Transcript

  • Ford EEC IV Operation and Testing
  • Overview
    • ECT
    • MAP/BARO
    • TPS
    • CKP/CMP
    • O2S
    • EGR Position
    • ACT
    • KS
    • BOO
    • AC
    • Power Steering
    PCM A/F Mixture Ignition Timing Idle Speed Thermactor Airflow Canister Purge EGR Flow TCC AC Fan WOT Cut Off Inlet Air Temp Fuel Pump Relay Turbo Boost
  • Operating Modes
    • Base Engine Strategy
    • MPG Lean Cruise
    • Modulator Strategy
    • Limited Operational Strategy
    • Adaptive Strategy
  • Base Engine Strategy
    • Used to control warm engine running
      • Open Loop starts at 130 o
      • Warm up mode sub modes
        • Cranking
        • Closed-throttle
        • Part throttle (closed loop)
        • Wide-open throttle (WOT)
      • PCM controls actuators for good driveability
  • MPG Lean Cruise
    • Some engines beginning 1988
    • Certain criteria are met
    • Goes out of closed-loop fuel control
    • Very lean for economy at cruise
  • Modulator Strategy
    • Conditions that require significant change from Base Engine Strategy
      • Cold engine
      • Overheated engine
      • High altitude
  • Limited Operational Strategy
    • Component Failure
    • Protect other components
      • Converter
    • Substitute values from another sensor
      • MAP TPS
      • ECT IAT
      • EGR Disable EGR
  • Adaptive Strategy
    • Started in 1985
    • PCM has base map
    • Monitors operation and modifies base map
    • Compensates for wear etc.
      • Dirty Injectors
    • Are in response to O2S
    • Stored in KAM
  • Adaptive Strategy
  • Adaptive Strategy
  • Adaptive Strategy
  • Adaptive Strategy
  • Inputs
    • ECT
    • MAP/BARO
    • TPS
    • CKP/CMP
    • O2S
    • EGR Position
    • ACT
    • KS
    • BOO
    • AC
    • Power Steering
    PCM A/F Mixture Ignition Timing Idle Speed Thermactor Airflow Canister Purge EGR Flow TCC AC Fan WOT Cut Off Inlet Air Temp Fuel Pump Relay Turbo Boost
  • Engine Coolant Temp
    • Thermistor
    • Voltage to PCM is 4.5 cold to .3 hot
    • Resistance 470K  cold to 1k  hot
    • Influences PCM’s calibrations for
      • A/F Raito
      • Idle Speed
      • Thermactor Air
      • Canister Purge
      • Choke Voltage, Temp compensated accel pump
      • Upshift light
  • Pressure Sensors
    • MAP, BARO
    • Pressure-sensitive capacitor
    • Convert to frequency out
      • 100 Hz no load Idle
      • 159 Hz atmospheric (WOT)
    • Voltage will go from 0 to 5 at the frequency above
  • Pressure Sensors
    • MAP used for BARO
      • PCM uses Key On before cranking and WOT for BARO calculations.
    • BARO used with Vane Airflow Sensors
    • Looks like MAP with collar
  • Throttle Position Sensor
    • Some adjustable, some not
    • Potentiometer
    • 3 wires, 5v reference, ground, signal
    • Two common problems
      • Bad spot, signal dropout
      • Bad ground
        • Full reference on signal
        • Biased high
  • Profile Ignition Pickup (PIP)
    • Hall Effect Switch
    • Engine speed and crank position
    • In distributor
    • One vane narrower for location
  • Profile Ignition Pickup (PIP)
    • On DIS sensor is on front of engine
    • One vane for each pair of companion cylinders
    • Most PIP signals go from .4v or less to battery voltage at 10 o BTDC
  • Cylinder Identification (CID)
    • Used with Distributorless Ignition
    • PIP doesn't know which stroke
    • Driven at cam speed
    • Also used for SFI
  • 4 Cylinder PIP CID
    • On DIS, 1 & 4 fire together
    • CID is on crank with PIP
  • Ignition Diagnostic Monitor
    • Used on TFI systems
    • Checks to see that spark occurred
    • Wire with 22k  from Tach wire to PCM
    • Makes sure SPOUT command is carried out
    • Makes sure timing advance is working
  • Knock Sensor (KS)
    • Piezoelectric type
    • Vibration sends signal to PCM
    • PCM retards timing 1/2 o per engine revolution
  • Intake Air Temp Sensor (IAT)
    • Was called Air Charge Temp (ACT) before OBDII
    • Thermistor
    • Voltages and resistance same as ECT
    • A/F and advance
    • Used on most Fords
  • EGR Position (EVP) Feedback (PFE)
    • EVP Linear Potentiometer
      • only monitors position
    • EVP Black and White physically interchangeable
    • PFE is like MAP but gives a voltage
      • Measures exhaust pressure under EGR valve
    • PFE measures flow used to
      • Fine tune EGR position
      • Fine tune A/F ratio
      • Modify ignition timing
  • Vane Air Flow (VAF)
    • Used with VAT and BP to calculate Speed Density
  • Mass Airflow MAF
    • Beginning in 1988
    • Uses sample tube
    • Uses hot wire
    • Encased in Glass
    • 200 o above ambient
    • A/F and Timing
  • Transmission Switches
    • PCM knows if in gear, park or neutral
    • Affects Idle air control strategy
      • For A/T because converter loads engine
    • Response to rapid throttle closing
  • Transmission Switches
    • AXOD uses 3 switches
      • Neutral Pressure NPS
      • Trans Hydraulic THS 3-2
      • Trans Hydraulic THS 4-3
    • AXOD Trans Temp TTS opens over 275 o F
      • Will apply TCC if temps get high like uphill climb
    Can tell which gear except if it is in 1 or 2
  • Transmission Switches
  • Transmission Switches
    • Manual Trans
      • Neutral Gear Switch NGS
      • Clutch Engaged Switch CES
      • Wired in parallel so both must be open for PCM to know car is in gear.
  • Brake On/Off BOO
    • In stop lamp switch
    • A4LD has PCM controlled converter lockup
    • Used on most models today
    • Increases idle when in gear and brakes are on
    • May disengage AC on prolonged idle
  • Vehicle Speed Sensor (VSS)
    • Speedometer output
      • Mechanical or electric speedometer.
    • 8 cycles per revolution
    • 128000 signals per mile
    • Used for
      • TCC lockup
      • Coolant fan control
      • Identify deceleration
  • Other Inputs
    • Power Steering Pressure Switch PSPS
      • Opens between 400 and 600 PSI
      • Increases idle speed
    • AC Demand (ACD)
    • AC Clutch Cycling Switch (ACCS)
      • PCM watches to increase idle speed
  • Outputs
    • ECT
    • MAP/BARO
    • TPS
    • CKP/CMP
    • O2S
    • EGR Position
    • ACT
    • KS
    • BOO
    • AC
    • Power Steering
    PCM A/F Mixture Ignition Timing Idle Speed Thermactor Airflow Canister Purge EGR Flow TCC AC Fan WOT Cut Off Inlet Air Temp Fuel Pump Relay Turbo Boost
  • Air / Fuel Mixture Control
    • Three types
      • Feedback Carburetors
      • Central Fuel Injection (TBI)
      • Electronic Fuel Injection (PFI)
        • Non Sequential
        • Group
        • Sequential
  • Feedback Carburetors
    • Motorcraft & Carter uses solenoid to bleed air into idle and main metering circuits
  • Holley Carburetors
    • Holley uses remote solenoid with similar idle control
  • Holley Carburetors
    • Uses vacuum diaphragm and valve for main metering control
  • Central Fuel Injection
    • Low Pressure System
      • Single injector
    • Low Pressure System
      • Two injectors
      • Alternates injectors
    • ECM grounds to turn on
    • Pulse Width Modulated
  • Central Fuel Injection
  • CFI Fuel Delivery
  • Port Fuel Injection (EFI)
  • Port Fuel Injection
    • Non-sequential (EFI)
    • Group or bank-to-bank
      • Two Groups
    • Sequential (SEFI)
      • Injectors pulsed one at a time in firing order
      • Used throughout product line by early 1990s
  • Injector Removal
  • Fuel Supply System
  • Fuel Supply System
    • Fuel Pump
      • In tank
      • Trucks may have a lift and pressure pump
      • Most are around 39 psi
      • Pressure relief at 100 psi
  • Fuel Supply System
    • Pressure regulator
      • Manifold pressure modified
      • Low of 30 around psi (deceleration)
      • High of 39 psi (WOT)
      • Turbocharged may go as high as 50 psi
      • CFI does not use manifold pressure.
        • High pressure 38-40 psi
        • Low pressure 14.5 psi
  • Fuel Supply System
    • Fuel Pump Relay PCM Controlled
    • Turns on with key for 1-2 seconds or until PIP signal is present.
    • Inertia Switch is in series with pump
  • Thick Film Integrated (TFI-IV)
    • Thick film refers to the type of semi-conductor
    • Controls spark primary
    • Sends PIP to PCM
    • PCM modifies and sends back SPOUT
    • SPOUT tells TFI when to turn primary on and off.
    • In distributor or “Closed Bowl”
  • Thick Film Integrated (TFI-IV)
  • Thick Film Integrated (TFI-IV) Closed Bowl TFI Module Octane rod can change base timing while keeping rotor right.
  • Distributorless Ignition
    • PCM controls dwell and timing
    • DIS module is like TFI module
    • Also uses SPOUT
      • Now called Spark Angle Word (SAW)
    • 1991 second generation using Reluctance instead of Hall sensors
    • 35 teeth on crank 36 minus1 for position
  • Distributorless Ignition
    • Base Timing Check
      • Remove SPOUT/SAW jumper
      • 10 o
      • Self check adds 20 o
    • Octane adjustment jumper looks like SPOUT
      • Retards 3 o to 4 o and can be left out
  •  
  • Spout Connectors
  • Idle Speed
    • Carbs & CFI use
      • Throttle kicker
      • DC motor idle speed control (ISC)
        • Idle Tracking Switch
          • Senses closed throttle
          • PCM then operates ISC
    • Act as Idle Dashpot
  • EFI Idle Speed Control
    • Air bypass solenoid
      • PCM Controlled
      • Duty Cycle pintle valve
      • Also a dashpot
  • Thermactor Air Management
    • Thermactor Air Bypass (TAB)
    • Thermactor Air Diverter (TAD)
    • PCM Controlled
  • Thermactor Air Management
    • CTS Below 50 o TAB grounded
      • Sends air to atmosphere
    • Between 50 and 190 Bypass valve sends air to diverter and to manifold
    • Over 190 closed loop and air goes to Cat
    • Bypass at idle, WOT, and with failing O2S
  • Open Loop Tip
    • The fastest way to see if vehicle is in open loop is to see where the air is going
    • Cat = Closed Loop
    • Atmosphere or manifold = Closed Loop
    • Provided thermactor system is working
  • Canister Purge
    • Three types
    • Constant purge with no PCM control
    • PCM controlled in-line solenoid
    • PCM controlled with temperature controlled vacuum valve
  • Canister Purge/Heat Control To valve that warms intake manifold
  • EGR Control
    • EGR Control and EGR Vent
    • 2 solenoids that are “dithered”
  • EGR Control
    • EGR Shutoff Solenoid
      • Uses one solenoid
      • Controls ported vacuum
    • EGR Shutoff Solenoid with Backpressure Transducer
      • One solenoid
      • Strength of vacuum controlled by transducer
      • Does not have EVP sensor
  • EGR Control
    • Vacuum Regulator
    • Introduced in 1985 and is used for most applications
  • EEC IV Diagnosis
    • Codes follow self test
    • Codes can be read
      • Manually
        • Watch MIL
        • Hook up meter
      • Star II
      • Other scan tool
    Notice the safety glasses 
  • Slow and Fast Codes
    • Slow codes can be read with pulsing meter or MIL
    • Fast codes can be read by scan tool
    • Fast codes precede slow and look like a momentary flashing.
  • Diagnostic Connector
  • KOEO Self Test Procedures
    • Engine warm
    • Turn off for 10 seconds
    • KOEO, then ground STI
    • Test will run, then read codes
    • All accessories off
    • 2.5L and 4.9L hold clutch fully in.
  • KOEO Self Test Codes
  • KOER Self Test Procedures
    • Engine warm 2000 RPM 2 min
    • Turn off for 10 seconds
    • KOER, then ground STI
    • Test will run, then read ID codes
    • Push brake and turn steering wheel
    • After code 10 (or 1 flash) snap WOT
  • KOER Self Test Codes
  • Computed Timing
    • Pull SPOUT/SAW
      • Check for 10 o with timing light
    • Reinstall SPOUT/SAW
    • Run KOER self test
      • At end of last code, 20 o will be added to base timing for 2 min.
  • Other Tests
    • Continuous monitor (wiggle)
      • After last code, deactivate and reactivate self test
      • Wiggle wires etc. Fault will display
    • SEFI Cylinder Balance
    • KOER after last code, tip throttle and release.
  •