TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics

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Abbrev. Meaning OCC Output Circuit Check OHC Over Head Camshaft (engine type) OSC Output State Check PCM Powertrain Control Module PFE Pressure Feedback EGR sensor or circuit PFI Port Fuel Injection PIP Profile Ignition Pickup PSPS Power Steering Pressure Switch PWR GND Power Ground circuit (see also GND) RWD Rear Wheel Drive SC Super Charged (engine type) SIG RTN Signal Return circuit SIL Shift Indicator Light SPOUT Spark Output Signal from ECA SS Shift Solenoid circuit STAR Self Test Automatic Readout (test equipment) STI Self Test Input circuit STO Self Test Output circuit TAB/TAD Thermactor Air Bypass/Diverter Tandem solenoid valves TAPS Throttle Angle Position Sensor (see TP/TPS) TFI Thick Film Ignition system (see DIS, EDIS) TGS Top Gear Switch (cancels SIL operation in top gear) THS Transmission Hydraulic Switch TP/TPS Throttle Position Sensor TTS Transmission Temperature Switch VAF Vane Air Flow sensor or circuit VAT Vane Air Temperature VBATT Vehicle Battery Voltage VM Vane Meter VOM Analog Volt/Ohm Meter VPWR Vehicle Power supply voltage (regulated 10-14 volts) VREF Voltage Reference (ECA supplied reference voltage 4-6 volts) VSC Vehicle Speed Control sensor or signal VSS Vehicle Speed Sensor or signal WAC WOT A/C Cut-off switch or circuit WOT Wide Open Throttle Table 64: EEC Related Terms EEC-IV REFERENCE SOURCES: Eectch98-Part6.fm The Engine/Emissions Diagnosis manual, available for specific models and years, covers all emissions related maintenance procedures. It is available from Helm, Inc., (800) 782-4356. "How to Understand, Service, and Modify Ford Fuel Injection and Electronic Engine Control", by Charles O. Probst, published by Robert Bentley of Cambridge, MA, USA, ISBN 0-8376-0301-3. It is available from a Ford Motorsports dealers and Classic Motorbooks at (800) 826-6600. It gives an overview of the sensors, actuators, and control algorithms used by the EEC-IV, step-by-step diagnostic procedures, wiring EEC-IV Technical Notes: Reference 78 last edited: 9/29/98
diagrams and tips on hot-rodding EEC-IV cars. Eectch98-Part6.fm SAE paper #820900, "EEC-IV Tomorrow’s Electronic Engine Controls Today", David Hagen & Dennis Wilkie, Ford Motor Co., Dearborn, MI Intel 8096 (MCS-96) literature. One document, available from their web site, is "27006102.pdf" entitled "APPLICATION NOTE; AP-248; Using The 8096"; Order Number: 270061-002. There are many other related documents available from Intel -- including the use of the A-D converter, the implementation of "fuzzy logic", instrumenting and controlling automotive applications, and other topics. AFTER-MARKET SUPPLIERS: Connectors for the EEC are apparently proprietary also, though some have said they are available through Amp, Farnell and DigiKey. There seem to be two channels of ECM availability: 1 - OEMs and the companies they authorize, who together provide remanufactured ECMs through dealer channels; 2 - and those involved in the remanufacturing of ECMs for the true automotive aftermarket. - A1 Cardone - Echlin - Micro-Tech Automotive - Standard Motor Parts Some of these companies catalog and offer product (or repair service) on almost 800 different ECM configurations for Ford-made vehicles in the model years from 1977- 1993. Some of these are consolidations of applications, where units have proven and tested to be comparable. Foreign made vehicles sold under the Ford nameplate would add to this population of ECMs, since the above count is only Ford units. For an idea of what the EEC does, and what can be done with it, get a demo of Mike Wesley’s calibrator for the EEC-IV at: http://www.tiac.net/users/goape/index.htm EEC-IV Technical Notes: Reference 79 last edited: 9/29/98
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TECHNICAL NOTES ON THE EEC-IV MCU I
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Eectch98-Intro.fm Below is a list o
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Technical Notes on the EEC-IV MCU E
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Figure: 8061 Microprocessor Figure:
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High Speed Output Unit HOLDING REGI
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Eectch98-Part1.fm logic analyzer. T
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8763 EPROM (IC-8) 8 GND RP4 20 CPU-
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0B nu 0C SHRL SHRDW logical right s
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FC CLRVT CLRVT clear overflow trap
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29 27 25 23 21 19 17 15 13 11 9 7 5
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No Mustang A9L '91 Ranger 2.3 '91 4
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Eectch98-Part2.fm some flow related
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Eectch98-Part2.fm mation and has th
Page 27 and 28: Scalar A9L Idle Speed Neutral Idle
Page 29 and 30: T I M E 45.00 0 0 0 0 0 0 0 0 0 0 3
Page 31 and 32: values. Divide them by 4 to convert
Page 33 and 34: ECT Advance -256 2 86 3 120 0 200 0
Page 35 and 36: RPM Seconds/ Degree 0 2.0000 0 2.00
Page 37 and 38: ECT Pulse Width (mS) 150 2.35546875
Page 39 and 40: Eectch98-Part2.fm (Note that, in In
Page 41 and 42: Eectch98-Part2.fm :17.25,18.5,18.5,
Page 43 and 44: min]:0.00341796875,0.0029296875,0.0
Page 45 and 46: A0 0F 0F A0 29 00 00 29 00 00 00 00
Page 47 and 48: Eectch98-Part3.fm would be equivale
Page 49 and 50: InHg is barometric pressure. TempF
Page 51 and 52: L/min Lo meter AFM1 AFM2 Hi meter A
Page 53 and 54: Eectch98-Part4.fm put the next byte
Page 55 and 56: Eectch98-Part4.fm goes to an HSO po
Page 57 and 58: Eectch98-Part5.fm • Air Meter Pin
Page 59 and 60: Eectch98-Part5.fm be better off wit
Page 61 and 62: RPM 800 1200 1600 2000 2400 2800 32
Page 63 and 64: Eectch98-Part5.fm 16d (Table 1). Al
Page 65 and 66: Eectch98-Part5.fm To achieve the EP
Page 67 and 68: Eectch98-Part5.fm only way out of n
Page 69 and 70: Eectch98-Part5.fm not cutting it up
Page 71 and 72: Eectch98-Part5.fm · Boost Retard S
Page 73 and 74: Eectch98-Part6.fm engine vehicle ye
Page 75 and 76: Eectch98-Part6.fm engine vehicle ye
Page 77: Abbrev. Meaning DVOM Digital Volt/O
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TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics

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