Ford EEC IV

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Ford EEC IV

  1. 1. Ford EEC IV Operation and Testing
  2. 2. Overview <ul><li>ECT </li></ul><ul><li>MAP/BARO </li></ul><ul><li>TPS </li></ul><ul><li>CKP/CMP </li></ul><ul><li>O2S </li></ul><ul><li>EGR Position </li></ul><ul><li>ACT </li></ul><ul><li>KS </li></ul><ul><li>BOO </li></ul><ul><li>AC </li></ul><ul><li>Power Steering </li></ul>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
  3. 3. Operating Modes <ul><li>Base Engine Strategy </li></ul><ul><li>MPG Lean Cruise </li></ul><ul><li>Modulator Strategy </li></ul><ul><li>Limited Operational Strategy </li></ul><ul><li>Adaptive Strategy </li></ul>
  4. 4. Base Engine Strategy <ul><li>Used to control warm engine running </li></ul><ul><ul><li>Open Loop starts at 130 o </li></ul></ul><ul><ul><li>Warm up mode sub modes </li></ul></ul><ul><ul><ul><li>Cranking </li></ul></ul></ul><ul><ul><ul><li>Closed-throttle </li></ul></ul></ul><ul><ul><ul><li>Part throttle (closed loop) </li></ul></ul></ul><ul><ul><ul><li>Wide-open throttle (WOT) </li></ul></ul></ul><ul><ul><li>PCM controls actuators for good driveability </li></ul></ul>
  5. 5. MPG Lean Cruise <ul><li>Some engines beginning 1988 </li></ul><ul><li>Certain criteria are met </li></ul><ul><li>Goes out of closed-loop fuel control </li></ul><ul><li>Very lean for economy at cruise </li></ul>
  6. 6. Modulator Strategy <ul><li>Conditions that require significant change from Base Engine Strategy </li></ul><ul><ul><li>Cold engine </li></ul></ul><ul><ul><li>Overheated engine </li></ul></ul><ul><ul><li>High altitude </li></ul></ul>
  7. 7. Limited Operational Strategy <ul><li>Component Failure </li></ul><ul><li>Protect other components </li></ul><ul><ul><li>Converter </li></ul></ul><ul><li>Substitute values from another sensor </li></ul><ul><ul><li>MAP TPS </li></ul></ul><ul><ul><li>ECT IAT </li></ul></ul><ul><ul><li>EGR Disable EGR </li></ul></ul>
  8. 8. Adaptive Strategy <ul><li>Started in 1985 </li></ul><ul><li>PCM has base map </li></ul><ul><li>Monitors operation and modifies base map </li></ul><ul><li>Compensates for wear etc. </li></ul><ul><ul><li>Dirty Injectors </li></ul></ul><ul><li>Are in response to O2S </li></ul><ul><li>Stored in KAM </li></ul>
  9. 9. Adaptive Strategy
  10. 10. Adaptive Strategy
  11. 11. Adaptive Strategy
  12. 12. Adaptive Strategy
  13. 13. Inputs <ul><li>ECT </li></ul><ul><li>MAP/BARO </li></ul><ul><li>TPS </li></ul><ul><li>CKP/CMP </li></ul><ul><li>O2S </li></ul><ul><li>EGR Position </li></ul><ul><li>ACT </li></ul><ul><li>KS </li></ul><ul><li>BOO </li></ul><ul><li>AC </li></ul><ul><li>Power Steering </li></ul>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
  14. 14. Engine Coolant Temp <ul><li>Thermistor </li></ul><ul><li>Voltage to PCM is 4.5 cold to .3 hot </li></ul><ul><li>Resistance 470K  cold to 1k  hot </li></ul><ul><li>Influences PCM’s calibrations for </li></ul><ul><ul><li>A/F Raito </li></ul></ul><ul><ul><li>Idle Speed </li></ul></ul><ul><ul><li>Thermactor Air </li></ul></ul><ul><ul><li>Canister Purge </li></ul></ul><ul><ul><li>Choke Voltage, Temp compensated accel pump </li></ul></ul><ul><ul><li>Upshift light </li></ul></ul>
  15. 15. Pressure Sensors <ul><li>MAP, BARO </li></ul><ul><li>Pressure-sensitive capacitor </li></ul><ul><li>Convert to frequency out </li></ul><ul><ul><li>100 Hz no load Idle </li></ul></ul><ul><ul><li>159 Hz atmospheric (WOT) </li></ul></ul><ul><li>Voltage will go from 0 to 5 at the frequency above </li></ul>
  16. 16. Pressure Sensors <ul><li>MAP used for BARO </li></ul><ul><ul><li>PCM uses Key On before cranking and WOT for BARO calculations. </li></ul></ul><ul><li>BARO used with Vane Airflow Sensors </li></ul><ul><li>Looks like MAP with collar </li></ul>
  17. 17. Throttle Position Sensor <ul><li>Some adjustable, some not </li></ul><ul><li>Potentiometer </li></ul><ul><li>3 wires, 5v reference, ground, signal </li></ul><ul><li>Two common problems </li></ul><ul><ul><li>Bad spot, signal dropout </li></ul></ul><ul><ul><li>Bad ground </li></ul></ul><ul><ul><ul><li>Full reference on signal </li></ul></ul></ul><ul><ul><ul><li>Biased high </li></ul></ul></ul>
  18. 18. Profile Ignition Pickup (PIP) <ul><li>Hall Effect Switch </li></ul><ul><li>Engine speed and crank position </li></ul><ul><li>In distributor </li></ul><ul><li>One vane narrower for location </li></ul>
  19. 19. Profile Ignition Pickup (PIP) <ul><li>On DIS sensor is on front of engine </li></ul><ul><li>One vane for each pair of companion cylinders </li></ul><ul><li>Most PIP signals go from .4v or less to battery voltage at 10 o BTDC </li></ul>
  20. 20. Cylinder Identification (CID) <ul><li>Used with Distributorless Ignition </li></ul><ul><li>PIP doesn't know which stroke </li></ul><ul><li>Driven at cam speed </li></ul><ul><li>Also used for SFI </li></ul>
  21. 21. 4 Cylinder PIP CID <ul><li>On DIS, 1 & 4 fire together </li></ul><ul><li>CID is on crank with PIP </li></ul>
  22. 22. Ignition Diagnostic Monitor <ul><li>Used on TFI systems </li></ul><ul><li>Checks to see that spark occurred </li></ul><ul><li>Wire with 22k  from Tach wire to PCM </li></ul><ul><li>Makes sure SPOUT command is carried out </li></ul><ul><li>Makes sure timing advance is working </li></ul>
  23. 23. Knock Sensor (KS) <ul><li>Piezoelectric type </li></ul><ul><li>Vibration sends signal to PCM </li></ul><ul><li>PCM retards timing 1/2 o per engine revolution </li></ul>
  24. 24. Intake Air Temp Sensor (IAT) <ul><li>Was called Air Charge Temp (ACT) before OBDII </li></ul><ul><li>Thermistor </li></ul><ul><li>Voltages and resistance same as ECT </li></ul><ul><li>A/F and advance </li></ul><ul><li>Used on most Fords </li></ul>
  25. 25. EGR Position (EVP) Feedback (PFE) <ul><li>EVP Linear Potentiometer </li></ul><ul><ul><li>only monitors position </li></ul></ul><ul><li>EVP Black and White physically interchangeable </li></ul><ul><li>PFE is like MAP but gives a voltage </li></ul><ul><ul><li>Measures exhaust pressure under EGR valve </li></ul></ul><ul><li>PFE measures flow used to </li></ul><ul><ul><li>Fine tune EGR position </li></ul></ul><ul><ul><li>Fine tune A/F ratio </li></ul></ul><ul><ul><li>Modify ignition timing </li></ul></ul>
  26. 26. Vane Air Flow (VAF) <ul><li>Used with VAT and BP to calculate Speed Density </li></ul>
  27. 27. Mass Airflow MAF <ul><li>Beginning in 1988 </li></ul><ul><li>Uses sample tube </li></ul><ul><li>Uses hot wire </li></ul><ul><li>Encased in Glass </li></ul><ul><li>200 o above ambient </li></ul><ul><li>A/F and Timing </li></ul>
  28. 28. Transmission Switches <ul><li>PCM knows if in gear, park or neutral </li></ul><ul><li>Affects Idle air control strategy </li></ul><ul><ul><li>For A/T because converter loads engine </li></ul></ul><ul><li>Response to rapid throttle closing </li></ul>
  29. 29. Transmission Switches <ul><li>AXOD uses 3 switches </li></ul><ul><ul><li>Neutral Pressure NPS </li></ul></ul><ul><ul><li>Trans Hydraulic THS 3-2 </li></ul></ul><ul><ul><li>Trans Hydraulic THS 4-3 </li></ul></ul><ul><li>AXOD Trans Temp TTS opens over 275 o F </li></ul><ul><ul><li>Will apply TCC if temps get high like uphill climb </li></ul></ul>Can tell which gear except if it is in 1 or 2
  30. 30. Transmission Switches
  31. 31. Transmission Switches <ul><li>Manual Trans </li></ul><ul><ul><li>Neutral Gear Switch NGS </li></ul></ul><ul><ul><li>Clutch Engaged Switch CES </li></ul></ul><ul><ul><li>Wired in parallel so both must be open for PCM to know car is in gear. </li></ul></ul>
  32. 32. Brake On/Off BOO <ul><li>In stop lamp switch </li></ul><ul><li>A4LD has PCM controlled converter lockup </li></ul><ul><li>Used on most models today </li></ul><ul><li>Increases idle when in gear and brakes are on </li></ul><ul><li>May disengage AC on prolonged idle </li></ul>
  33. 33. Vehicle Speed Sensor (VSS) <ul><li>Speedometer output </li></ul><ul><ul><li>Mechanical or electric speedometer. </li></ul></ul><ul><li>8 cycles per revolution </li></ul><ul><li>128000 signals per mile </li></ul><ul><li>Used for </li></ul><ul><ul><li>TCC lockup </li></ul></ul><ul><ul><li>Coolant fan control </li></ul></ul><ul><ul><li>Identify deceleration </li></ul></ul>
  34. 34. Other Inputs <ul><li>Power Steering Pressure Switch PSPS </li></ul><ul><ul><li>Opens between 400 and 600 PSI </li></ul></ul><ul><ul><li>Increases idle speed </li></ul></ul><ul><li>AC Demand (ACD) </li></ul><ul><li>AC Clutch Cycling Switch (ACCS) </li></ul><ul><ul><li>PCM watches to increase idle speed </li></ul></ul>
  35. 35. Outputs <ul><li>ECT </li></ul><ul><li>MAP/BARO </li></ul><ul><li>TPS </li></ul><ul><li>CKP/CMP </li></ul><ul><li>O2S </li></ul><ul><li>EGR Position </li></ul><ul><li>ACT </li></ul><ul><li>KS </li></ul><ul><li>BOO </li></ul><ul><li>AC </li></ul><ul><li>Power Steering </li></ul>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
  36. 36. Air / Fuel Mixture Control <ul><li>Three types </li></ul><ul><ul><li>Feedback Carburetors </li></ul></ul><ul><ul><li>Central Fuel Injection (TBI) </li></ul></ul><ul><ul><li>Electronic Fuel Injection (PFI) </li></ul></ul><ul><ul><ul><li>Non Sequential </li></ul></ul></ul><ul><ul><ul><li>Group </li></ul></ul></ul><ul><ul><ul><li>Sequential </li></ul></ul></ul>
  37. 37. Feedback Carburetors <ul><li>Motorcraft & Carter uses solenoid to bleed air into idle and main metering circuits </li></ul>
  38. 38. Holley Carburetors <ul><li>Holley uses remote solenoid with similar idle control </li></ul>
  39. 39. Holley Carburetors <ul><li>Uses vacuum diaphragm and valve for main metering control </li></ul>
  40. 40. Central Fuel Injection <ul><li>Low Pressure System </li></ul><ul><ul><li>Single injector </li></ul></ul><ul><li>Low Pressure System </li></ul><ul><ul><li>Two injectors </li></ul></ul><ul><ul><li>Alternates injectors </li></ul></ul><ul><li>ECM grounds to turn on </li></ul><ul><li>Pulse Width Modulated </li></ul>
  41. 41. Central Fuel Injection
  42. 42. CFI Fuel Delivery
  43. 43. Port Fuel Injection (EFI)
  44. 44. Port Fuel Injection <ul><li>Non-sequential (EFI) </li></ul><ul><li>Group or bank-to-bank </li></ul><ul><ul><li>Two Groups </li></ul></ul><ul><li>Sequential (SEFI) </li></ul><ul><ul><li>Injectors pulsed one at a time in firing order </li></ul></ul><ul><ul><li>Used throughout product line by early 1990s </li></ul></ul>
  45. 45. Injector Removal
  46. 46. Fuel Supply System
  47. 47. Fuel Supply System <ul><li>Fuel Pump </li></ul><ul><ul><li>In tank </li></ul></ul><ul><ul><li>Trucks may have a lift and pressure pump </li></ul></ul><ul><ul><li>Most are around 39 psi </li></ul></ul><ul><ul><li>Pressure relief at 100 psi </li></ul></ul>
  48. 48. Fuel Supply System <ul><li>Pressure regulator </li></ul><ul><ul><li>Manifold pressure modified </li></ul></ul><ul><ul><li>Low of 30 around psi (deceleration) </li></ul></ul><ul><ul><li>High of 39 psi (WOT) </li></ul></ul><ul><ul><li>Turbocharged may go as high as 50 psi </li></ul></ul><ul><ul><li>CFI does not use manifold pressure. </li></ul></ul><ul><ul><ul><li>High pressure 38-40 psi </li></ul></ul></ul><ul><ul><ul><li>Low pressure 14.5 psi </li></ul></ul></ul>
  49. 49. Fuel Supply System <ul><li>Fuel Pump Relay PCM Controlled </li></ul><ul><li>Turns on with key for 1-2 seconds or until PIP signal is present. </li></ul><ul><li>Inertia Switch is in series with pump </li></ul>
  50. 50. Thick Film Integrated (TFI-IV) <ul><li>Thick film refers to the type of semi-conductor </li></ul><ul><li>Controls spark primary </li></ul><ul><li>Sends PIP to PCM </li></ul><ul><li>PCM modifies and sends back SPOUT </li></ul><ul><li>SPOUT tells TFI when to turn primary on and off. </li></ul><ul><li>In distributor or “Closed Bowl” </li></ul>
  51. 51. Thick Film Integrated (TFI-IV)
  52. 52. Thick Film Integrated (TFI-IV) Closed Bowl TFI Module Octane rod can change base timing while keeping rotor right.
  53. 53. Distributorless Ignition <ul><li>PCM controls dwell and timing </li></ul><ul><li>DIS module is like TFI module </li></ul><ul><li>Also uses SPOUT </li></ul><ul><ul><li>Now called Spark Angle Word (SAW) </li></ul></ul><ul><li>1991 second generation using Reluctance instead of Hall sensors </li></ul><ul><li>35 teeth on crank 36 minus1 for position </li></ul>
  54. 54. Distributorless Ignition <ul><li>Base Timing Check </li></ul><ul><ul><li>Remove SPOUT/SAW jumper </li></ul></ul><ul><ul><li>10 o </li></ul></ul><ul><ul><li>Self check adds 20 o </li></ul></ul><ul><li>Octane adjustment jumper looks like SPOUT </li></ul><ul><ul><li>Retards 3 o to 4 o and can be left out </li></ul></ul>
  55. 56. Spout Connectors
  56. 57. Idle Speed <ul><li>Carbs & CFI use </li></ul><ul><ul><li>Throttle kicker </li></ul></ul><ul><ul><li>DC motor idle speed control (ISC) </li></ul></ul><ul><ul><ul><li>Idle Tracking Switch </li></ul></ul></ul><ul><ul><ul><ul><li>Senses closed throttle </li></ul></ul></ul></ul><ul><ul><ul><ul><li>PCM then operates ISC </li></ul></ul></ul></ul><ul><li>Act as Idle Dashpot </li></ul>
  57. 58. EFI Idle Speed Control <ul><li>Air bypass solenoid </li></ul><ul><ul><li>PCM Controlled </li></ul></ul><ul><ul><li>Duty Cycle pintle valve </li></ul></ul><ul><ul><li>Also a dashpot </li></ul></ul>
  58. 59. Thermactor Air Management <ul><li>Thermactor Air Bypass (TAB) </li></ul><ul><li>Thermactor Air Diverter (TAD) </li></ul><ul><li>PCM Controlled </li></ul>
  59. 60. Thermactor Air Management <ul><li>CTS Below 50 o TAB grounded </li></ul><ul><ul><li>Sends air to atmosphere </li></ul></ul><ul><li>Between 50 and 190 Bypass valve sends air to diverter and to manifold </li></ul><ul><li>Over 190 closed loop and air goes to Cat </li></ul><ul><li>Bypass at idle, WOT, and with failing O2S </li></ul>
  60. 61. Open Loop Tip <ul><li>The fastest way to see if vehicle is in open loop is to see where the air is going </li></ul><ul><li>Cat = Closed Loop </li></ul><ul><li>Atmosphere or manifold = Closed Loop </li></ul><ul><li>Provided thermactor system is working </li></ul>
  61. 62. Canister Purge <ul><li>Three types </li></ul><ul><li>Constant purge with no PCM control </li></ul><ul><li>PCM controlled in-line solenoid </li></ul><ul><li>PCM controlled with temperature controlled vacuum valve </li></ul>
  62. 63. Canister Purge/Heat Control To valve that warms intake manifold
  63. 64. EGR Control <ul><li>EGR Control and EGR Vent </li></ul><ul><li>2 solenoids that are “dithered” </li></ul>
  64. 65. EGR Control <ul><li>EGR Shutoff Solenoid </li></ul><ul><ul><li>Uses one solenoid </li></ul></ul><ul><ul><li>Controls ported vacuum </li></ul></ul><ul><li>EGR Shutoff Solenoid with Backpressure Transducer </li></ul><ul><ul><li>One solenoid </li></ul></ul><ul><ul><li>Strength of vacuum controlled by transducer </li></ul></ul><ul><ul><li>Does not have EVP sensor </li></ul></ul>
  65. 66. EGR Control <ul><li>Vacuum Regulator </li></ul><ul><li>Introduced in 1985 and is used for most applications </li></ul>
  66. 67. EEC IV Diagnosis <ul><li>Codes follow self test </li></ul><ul><li>Codes can be read </li></ul><ul><ul><li>Manually </li></ul></ul><ul><ul><ul><li>Watch MIL </li></ul></ul></ul><ul><ul><ul><li>Hook up meter </li></ul></ul></ul><ul><ul><li>Star II </li></ul></ul><ul><ul><li>Other scan tool </li></ul></ul>Notice the safety glasses 
  67. 68. Slow and Fast Codes <ul><li>Slow codes can be read with pulsing meter or MIL </li></ul><ul><li>Fast codes can be read by scan tool </li></ul><ul><li>Fast codes precede slow and look like a momentary flashing. </li></ul>
  68. 69. Diagnostic Connector
  69. 70. KOEO Self Test Procedures <ul><li>Engine warm </li></ul><ul><li>Turn off for 10 seconds </li></ul><ul><li>KOEO, then ground STI </li></ul><ul><li>Test will run, then read codes </li></ul><ul><li>All accessories off </li></ul><ul><li>2.5L and 4.9L hold clutch fully in. </li></ul>
  70. 71. KOEO Self Test Codes
  71. 72. KOER Self Test Procedures <ul><li>Engine warm 2000 RPM 2 min </li></ul><ul><li>Turn off for 10 seconds </li></ul><ul><li>KOER, then ground STI </li></ul><ul><li>Test will run, then read ID codes </li></ul><ul><li>Push brake and turn steering wheel </li></ul><ul><li>After code 10 (or 1 flash) snap WOT </li></ul>
  72. 73. KOER Self Test Codes
  73. 74. Computed Timing <ul><li>Pull SPOUT/SAW </li></ul><ul><ul><li>Check for 10 o with timing light </li></ul></ul><ul><li>Reinstall SPOUT/SAW </li></ul><ul><li>Run KOER self test </li></ul><ul><ul><li>At end of last code, 20 o will be added to base timing for 2 min. </li></ul></ul>
  74. 75. Other Tests <ul><li>Continuous monitor (wiggle) </li></ul><ul><ul><li>After last code, deactivate and reactivate self test </li></ul></ul><ul><ul><li>Wiggle wires etc. Fault will display </li></ul></ul><ul><li>SEFI Cylinder Balance </li></ul><ul><li>KOER after last code, tip throttle and release. </li></ul>

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