Ecu
Honda OBD0/1 ECU Component List
Reference of the components on Honda/Acura OBD0 and OBD1 ECU boards: IDs, types, specs, and repair notes.
Honda ECU Identification and Compatibility FAQ
A foundational reference for identifying Honda ECU families, understanding compatibility, and navigating common ECU part...
OBD1 PR4 ECU Hardware Reference
Hardware layouts, component locations, and chipping instructions for the OBD1 Acura Integra PR4 ECU.
Guide to EPROM and Flash ROM Burners
A technical guide to selecting and using EPROM and Flash ROM burners for programming 27C256 and SST 27SF256 memory chips...
82C55 Programmable Peripheral Interface
Technical specifications and pinout mapping for the OKI MSM82C55A Programmable Peripheral Interface (PPI) chip used in H...
OBD1 Honda ECU Architecture and Memory Mapping
A technical overview of OBD1 Honda ECU hardware architecture, including memory mapping, I/O expander functionality, and...
OBD0 Acura Integra PR4 ECU Technical Reference
Technical overview of the hardware variations, barometric sensors, and unique I/O configurations of the OBD0 Acura Integ...
Honda ECU Component Sourcing Reference
Reference guide for historic supplier part numbers for electronic components used in the modification and repair of Hond...
Oki 66K Processor Resources
Comprehensive resource list for the Oki 66K processor family used in Honda OBD1 and OBD2 ECUs, including assemblers, dis...
Understanding ECU Binary (.bin) Files
An overview of binary (.bin) files used in Honda ECU tuning, explaining their structure as raw 8-bit data containers for...
Guide to Desoldering Stations for ECU Work
Technical guide to using professional desoldering stations for removing multi-pin DIP chips from double-sided ECU boards...
Honda PGM-FI Engine Control Unit (ECU) Identification
A guide to identifying Honda PGM-FI Engine Control Unit (ECU) variants, including manual versus automatic transmission a...
OBD0 DOHC ZC PM7 ECU Reference
Technical specifications, board layout documentation, and stock ROM binaries for the OBD0 DOHC ZC PM7 ECU.
OBD1 Prelude P14 ECU Guide
Hardware specifications, board layout differences, knock sensor configurations, and ROM files for the 1993–1995 OBD1 Pre...
ROM Emulator Technical Overview
ROM emulators function as real-time, rewritable memory replacements for ECU EPROM chips, allowing for on-the-fly data mo...
UV EPROM Erasure Procedures
Technical guide to using UV light for erasing EPROM chips with transparent windows for re-programming.
27C256 EPROM Specifications
Technical specifications, pinout diagrams, and speed requirements for the 27C256 EPROM chip used in OBD0 and OBD1 Honda...
28C256 EEPROM Pinout and ECU Compatibility
Technical specifications, pinout mapping, and socket modification instructions for using the 28C256 EEPROM chip in stand...
Desoldering Tools for ECU Modification
A technical overview of manual desoldering tools, including pumps, bulbs, and braids, for safe ECU component removal.
EPROMer5 Device Programmer Technical Guide
Technical overview and troubleshooting guide for the legacy EPROMer5 parallel-port device programmer used for 27C256 and...
EPROMer5 Parallel-Port EPROM Programmer
Technical reference and cross-reference documentation for the EPROMer5 parallel-port EPROM programmer.
Honda ECU Families & Generations
An overview of different generations and families of Honda engine control units (OBD0, OBD1, and OBD2) and their compati...
OBD1 Large-Case ECU Chipping Guide
A comprehensive technical guide for socketing and chipping large-case Honda OBD1 ECUs, covering required components and...
Soldering Guide for ECU Modifications
A comprehensive guide to professional soldering techniques, tool selection, and thermal management for modifying Honda E...
74HC373 Octal Latch IC
Technical overview of the 74HC373 octal latch IC, commonly used for external ROM interfacing in Honda ECU hardware.
OBD0 ECU Inter-Chip Communication and Memory Mapping
Technical documentation regarding the OBD0 ECU memory bus, peripheral address ranges, and chip-select logic for the OKI...
One Time Programmable (OTP) EPROM
An overview of One Time Programmable (OTP) EPROMs used in engine control units, detailing their permanent data storage c...
Red Loctite Thread-Locking Compound
Technical guidance on the application and removal of high-strength Red Loctite thread-locking compound for critical Hond...
Willem EPROM Programmer Guide
Configuring and using Willem EPROM programmers for burning SST 27SF512 and 27SF256 ROM chips for Honda OBD0 and OBD1 ECU...
Desoldering Tips & Best Practices
Practical tips, tricks, and best practices for desoldering components from delicate ECU circuit boards.
ECU Definition Codes
A reference table of Honda and Acura OBD0, OBD1, and OBD2 ECU part numbers, their markets, and corresponding code design...
EETools ChipMax Device Programmer
Technical overview and usage guide for the EETools ChipMax universal device programmer, focusing on EPROM and EEPROM sup...
Honda Distributor Ignitor Replacement for Aftermarket Ignition
Replace the internal Honda distributor ignitor with a solid-state circuit to provide a clean trigger signal for aftermar...
Honda ECU Hardware Architecture
An overview of Honda ECU hardware architecture, including PCB families, MCU specifications, and common hardware modifica...
Locking Pliers (Vise-Grips) for Automotive Hardware
An overview of the locking pliers (vise-grip) and their essential role in automotive hardware removal and modification o...
OKI M6260A Engine Control Counter IC
Technical reference for the OKI M6260A Engine Control Counter IC, a custom timing and I/O coprocessor used in Honda OBD0...
USDM vs. Canadian OBD0 PM6 ECU Differences and ELD Bypass
Technical guide for identifying hardware differences between USDM and Canadian OBD0 PM6 ECUs and resolving Code 20 CEL b...
Chipping OBD2 Honda ECUs (OKI 66507 / 66P507)
Hardware guide for chipping OBD2 Honda ECUs by replacing the OKI 66507 processor with a programmed 66P507 OTP microcontr...
Honda ECU Chipping Visual Reference Guide
Comprehensive visual guides for chipping OBD0 and OBD1 Honda ECUs, including PM6, big-case, small-case, and 1988-1989 va...
Honda ECU EPROM Compatibility Reference
A technical reference for EPROM compatibility in OBD0 and OBD1 Honda ECUs, including common chip types and pin-compatibi...
Honda ECU Microcontroller (MCU) Overview
An overview of microcontroller (MCU) units used in Honda ECUs, defining their role as integrated CPUs with onboard memor...
Intel 8051 Development Reference
A technical reference for Intel 8051 architecture development, including recommended assemblers, disassemblers, and deve...
Sourcing Memory Chips for Honda OBD0 and OBD1 ECUs
A technical guide for selecting compatible 32 KB memory chips for Honda OBD0 and OBD1 ECU chipping, covering flash, EPRO...
ECU Control Software Overview
An overview of ECU Control software for real-time Honda engine management, data logging, and tuning.
OBD0 PR3 ECU Automatic to Manual Conversion
Step-by-step procedure to convert an OBD0 PR3 ECU from automatic to manual transmission by relocating the R68 resistor.
PM6 ECU (OBD0) Hardware and Code Reference
Detailed hardware specifications, pinouts, and codebase support for the OBD0 PM6 Civic/CRX Si SOHC ECU.
Soldering Iron Selection and Usage Guidelines
A guide to selecting and using soldering equipment for ECU modification, focusing on ESD safety, temperature control, an...
Using and Modifying Bulb-Style Desoldering Irons
A guide to using and modifying budget-friendly bulb-style desoldering irons for ECU chipping and through-hole solder rem...
Chipping the JDM OBD1 P30 ECU
Hardware modification guide for socketing, chipping, and converting JDM square-case OBD1 P30 ECUs to manual transmission...
Chipping the OBD0 PM6 ECU (1988–1991 Civic/CRX Si)
Step-by-step hardware guide to chipping the OBD0 PM6 ECU (1988–1991 Civic/CRX Si) to accept external EPROMs and custom t...
Easy-RTP v1.0 OBD1 Installation Guide
Technical installation procedure for integrating the Easy-RTP v1.0 module into OBD1 P28 and P30 ECUs.
FLASH Memory Architecture
An overview of FLASH memory technology, explaining its sector-based erase and write operations in the context of automot...
Honda ECU Internal ROM Architecture
An overview of internal ROM memory storage within Honda ECU microcontrollers and its function in engine management syste...
Latch Logic and ECU Implementation
An overview of latching logic gates, such as the 74HC373, used to hold and preserve the state of I/O lines in ECU hardwa...
PL2 ECU Hardware Reference
Technical overview and internal hardware documentation for the PL2 ECU used in Acura and Rover V6 (C25/C27) applications...
SST27SF256 Flash Memory Reference
The SST27SF256 is an electrically-erasable CMOS flash memory chip serving as a direct, cost-effective replacement for th...
Thread-Locking Compound Selection and Application
A technical guide on the application of medium-strength thread-locking compounds for securing Honda engine hardware and...
Converting Intel HEX Files to Binary (BIN)
Learn how to convert Intel HEX files to binary (BIN) format for ECU tuning and ROM programming using the hex2bin utility...