TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics

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Technical Notes on the EEC-IV MCU Table of contents Eectch98TOC.fm TECHNICAL NOTES ON THE EEC-IV MCU ====================================== 1 INTRODUCTION =========================================================== 1 DISCLAIMER - - - - - - - - - - - - - - - - - - - - 1 PURPOSE - - - - - - - - - - - - - - - - - - - - - 1 Table 1: EFI Related Mailing Lists - - - - - - - - - - - - - - 1 OVERVIEW - - - - - - - - - - - - - - - - - - - - - 2 ACKNOWLEDGEMENTS / CONTRIBUTORS - - - - - - - - - - - - - 2 Table 2: Document Revision History - - - - - - - - - - - - - - 3 TABLE OF CONTENTS ====================================================== 4 HARDWARE =============================================================== 7 THE MICROPROCESSOR / MEMORY CHIP SET: - - - - - - - - - - - 7 Figure 1: 8061 Microprocessor - - - - - - - - - - - - - 7 Figure 2: 8061 Major Functional Units - - - - - - - - - - - 7 Figure 3: 8061 CPU - - - - - - - - - - - - - - - - - 8 Figure 4: 8061 High Input Unit - - - - - - - - - - - - - 8 Figure 5: High Speed Output Unit - - - - - - - - - - - - 9 Figure 6: Vector to Service Routine - - - - - - - - - - - 9 Figure 7: 8763 EPROM - - - - - - - - - - - - - - - - 9 Figure 8: 81C61 RAM - I/O - - - - - - - - - - - - - - 10 Table 3: EEC Chipset Nomenclature Legend - - - - - - - - - - - - 11 Table 4: 8061 CPU Pinout - - - - - - - - - - - - - - - - - - 11 Table 5: 8361 RAM/IO Pinout - - - - - - - - - - - - - - - - - 12 Table 6: 87C61 RAM/IO Pinout - - - - - - - - - - - - - - - - 12 Table 7: 8763 EPROM Pinout - - - - - - - - - - - - - - - - - 12 Table 8: 8061 Chipset Legend - - - - - - - - - - - - - - - - 13 8061 MEMORY MAP - - - - - - - - - - - - - - - - - 14 8061 INSTRUCTIONS, REGISTERS & INTERRUPTS - - - - - - - - - 14 Table 9: 8096-8061/5 Instruction Differences - - - - - - - - - - - 14 Table 10: 8096-8061 Op-Codes - - - - - - - - - - - - - - - - 14 Table 11: Op-Code Map 00-70 - - - - - - - - - - - - - - - - - 17 Table 12: Op-Code Map 80-FF - - - - - - - - - - - - - - - - - 17 Table 13: 8061 Interrupt Vectors and Priorities - - - - - - - - - - 17 Table 14: Register Map - - - - - - - - - - - - - - - - - - 18 ECM TEST PORT (J3) - - - - - - - - - - - - - - - - 19 Table 15: ECM Test Port (J3) Pinout - - - - - - - - - - - - - - 19 Figure 9: J3 Service Port Connector - - - - - - - - - - 19 ECM WIRING HARNESS - - - - - - - - - - - - - - - - 20 Table 16: ECM CABLE PINOUT - - - - - - - - - - - - - - - - - 20 Figure 10: EEC Main Connector - - - - - - - - - - - - 20 SOFTWARE ============================================================== 22 THE BASICS - - - - - - - - - - - - - - - - - - - 22 INTERNAL DIAGNOSTICS - - - - - - - - - - - - - - - - 22 FUEL CONTROL - - - - - - - - - - - - - - - - - - 22 IGNITION AND TIMING CONTROL: - - - - - - - - - - - - - 24 EEC-IV Technical Notes: Table of Contents last edited: 9/29/98
Technical Notes on the EEC-IV MCU Eectch98TOC.fm Knock Sensor - - - - - - - - - - - - - - - - - - - - 25 LIMITED OUTPUT STRATEGY (LOS) OPERATION - - - - - - - - - 25 FUNCTIONS / SCALARS / TABLES - - - - - - - - - - - - - 25 Table 17: EEC Functions - - - - - - - - - - - - - - - - - - 26 Table 18: EEC Scalars - - - - - - - - - - - - - - - - - - - 26 Table 19: Example Scalars from Calibrator Demo - - - - - - - - - - 27 A9L Constants & Locations - - - - - - - - - - - - - - - - 28 Table 20: EEC Tables - - - - - - - - - - - - - - - - - - - 28 Table 21: Accel Enrichment Fuel [lb/min] - - - - - - - - - - - - 28 Table 22: Startup Fuel Ratio - - - - - - - - - - - - - - - - 28 Base Fuel A:F Ratio: - - - - - - - - - - - - - - - - 29 Table 23: Base Fuel A:F Ratio - - - - - - - - - - - - - - - - 29 Table 24: Injector Timing - - - - - - - - - - - - - - - - - 29 Table 25: Injector Firing Order - - - - - - - - - - - - - - - 29 Table 26: Base Spark [Deg BTDC] - - - - - - - - - - - - - - - 30 Table 27: Altitude Base Spark [Deg BTDC] - - - - - - - - - - - - 30 Table 28: Limp Mode Spark Table [Deg BTDC] - - - - - - - - - - - - 31 Table 29: Injector Output Port Table - - - - - - - - - - - - - - 31 Table 30: Load Scaling - - - - - - - - - - - - - - - - - - 31 Table 31: MAF Transfer Function - - - - - - - - - - - - - - - 32 Table 32: WOT Spark Advance vs RPM - - - - - - - - - - - - - - 32 Table 33: WOT Spark Advance vs. ECT - - - - - - - - - - - - - - 33 Table 34: WOT Spark Advance vs. ACT - - - - - - - - - - - - - - 33 Table 35: Accelerator Enrichment Multiplier vs TP - - - - - - - - - 33 Table 36: Open Loop Fuel Multiplier vs. ACT - - - - - - - - - - - 34 Table 37: Spark Advance vs. ACT - - - - - - - - - - - - - - - 34 Table 38: Spark Advance vs. BP - - - - - - - - - - - - - - - - 34 Table 39: Spark Advance Rate vs. RPM - - - - - - - - - - - - - - 35 Table 40: Minimum Low Speed Dwell - - - - - - - - - - - - - - - 35 Table 41: Minimum High Speed Dwell - - - - - - - - - - - - - - 35 Table 42: Maximum Dashpot Clip - - - - - - - - - - - - - - - - 35 Table 43: Sea Level Lugging O/L Fuel Multiplier - - - - - - - - - - 36 Table 44: Altitude Lugging O/L Fuel Multiplier - - - - - - - - - - 36 Table 45: Crank Fuel Pulse Width Multiplier - - - - - - - - - - - 36 Table 46: Cranking Fuel Pulse width vs. ECT - - - - - - - - - - - 36 Table 47: Injector Offset vs. Battery Voltage - - - - - - - - - - - 37 Table 48: Open Loop Fuel Multiplier vs. RPM - - - - - - - - - - - 37 Data Pointers - - - - - - - - - - - - - - - - - - - 38 Idle Speed Constants - - - - - - - - - - - - - - - - - 38 Table 49: A9L Idle Speed Addresses - - - - - - - - - - - - - - 38 Speed Limiters - - - - - - - - - - - - - - - - - - - 39 Rev Limiter - - - - - - - - - - - - - - - - - - - - 39 Half Fuel Limits - - - - - - - - - - - - - - - - - - 39 A9L Tables - - - - - - - - - - - - - - - - - - - - - 39 A9L Table Format Explanation - - - - - - - - - - - - - - - 43 DA1 Constants & Locations - - - - - - - - - - - - - - - - 45 SENSORS =============================================================== 46 EGO - - - - - - - - - - - - - - - - - - - - - 46 EGR - - - - - - - - - - - - - - - - - - - - - 46 ACT - - - - - - - - - - - - - - - - - - - - - 47 TFI / PIP - - - - - - - - - - - - - - - - - - - 47 Table 50: ACT Transfer Function - - - - - - - - - - - - - - - 47 KNOCK SENSOR - - - - - - - - - - - - - - - - - - 48 EEC-IV Technical Notes: Table of Contents last edited: 9/29/98
Page 1 and 2: TECHNICAL NOTES ON THE EEC-IV MCU I
Page 3: Eectch98-Intro.fm Below is a list o
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Page 9 and 10: High Speed Output Unit HOLDING REGI
Page 11 and 12: Eectch98-Part1.fm logic analyzer. T
Page 13 and 14: 8763 EPROM (IC-8) 8 GND RP4 20 CPU-
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Page 17 and 18: FC CLRVT CLRVT clear overflow trap
Page 19 and 20: 29 27 25 23 21 19 17 15 13 11 9 7 5
Page 21 and 22: No Mustang A9L '91 Ranger 2.3 '91 4
Page 23 and 24: Eectch98-Part2.fm some flow related
Page 25 and 26: 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
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Page 41 and 42: Eectch98-Part2.fm :17.25,18.5,18.5,
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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
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Eectch98-Part5.fm • Air Meter Pin
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RPM 800 1200 1600 2000 2400 2800 32
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Abbrev. Meaning DVOM Digital Volt/O
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diagrams and tips on hot-rodding EE
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TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics

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