Sensors
`66207`
The Oki 66207 MCU is used mainly in the OBD1 Civic Integra ECUs. It uses the NX8/200 core. Lots of useful documentation...
`C144`
C144 is a NPN switching transistor. It has been successfully replaced with C2785 (and its replacements).
`MAX233`
the Maxim MAX233 chip is commonly used to translate between TTL and RS232 levels during serial communication.
66k Assembler Routines
See: OBD1 Civ Teg Routines or ...
91PM7
Describe 91 PM7 here. bleh 91 PM7 Target Idle = setting the idle on a PM7
A143
Thanks again Javier (dohcvtec): A143====Panasonic NTE2362 === (Digikey 2SB1030ARACTND) (do not be fooled into believing...
Absolute Vacuum
Absolute vacuum only truly exists in deep space. It is the state where an object is surrounded by absolutely nothing.
Adding IAB Control to an OBD1 P28 ECU
Hardware modification guide to add Intake Air Bypass (IAB) secondary runner controls to an OBD1 Honda P28 Civic ECU.
Automatic Transmission Lockup Solenoid
the Automatic Transmission Lockup Solenoid is a solenoid present in automatic cars transmissions that causes the torque...
Back Links
The contents of all pages are searched to find links to the current page. The Back Links function also answers the quest...
C Carry Bit
In the 8051 architecture, "C" is the name of the carry bit. When an arithmetic operation overflows, the carry bit is set...
C2785
C2785 is a high speed NPN switching transistor Thanks to Javier (dohcvtec) for a handy C2785 replacement.
Chipping OBD1 Small Case
For a write up go to Chipping JDMP30
Clock Speed
Clock Speed refers to how fast the crystal oscillator driving the MCU is. It is important for calculating things based o...
Cylinder Position Sensor
The cylinder position (CYP) sensor and its role in injection timing.
Digi Key
DigiKey is one of the larger and more convenient mail order electronic part suppliers in the USA.
Disable VTEC VSS Check
bleh fuckup
Disable VTEC VSS Check P72
How to disable 25mph VSS check for VTEC engagement on P72: Author: Speedz Date: 082303 15:59 here's where its at in the...
Distributors
A distributor is a device that allows one Ignition Coil to provide spark to more than one (distribute) cylinder.
DIY
Do It Yourself. This website is based on the DIY concept. Everyhting is not laid out on a silver platter. Do It Yourself...
DOHC
Dual ~OverHead Cam motors have a seperate Cam Shaft for both Intake Valves and Exhaust Valves. See also SOHC.
DPFI
(Dual Point Fuel Injection) Please refer to the explanation of Dual Point.
Dual Point
Dual Point is used for refering to the DPFI ( DualPoint Fuel Injection) motors and ECUs. It is essencialy the next gener...
ECT
Engine Coolant Temperature
ECU Sensors
The input sensors a Honda ECU reads to run fuel and ignition.
Electrical Load Detector
Electronic Load Detector measures electrical load used to determine if the alternator should be in low or high output mo...
Electronic Advance
Electronic Advance refers to a motor setup where Spark Advance can be controlled electronically by the ECU.
Electronic Advance Distributors
Electronic Advance Distributors are distributors where the amount of Spark Advance can be controlled electronically by t...
Electronic Air Control Vale
See : Idle Air Control Valve
Engine Simulator
See Engine Sim
ERM
see Uber Data ERM
Fuel Octane
Fuel "Octane" is a measure of gasoline's resistance to Pre Ignition. the Gasoline FAQ explains all you ever wanted to kn...
Future Active
Future Active is a major electronic parts distributor. They sell both the 27SF256 and Aries lowprofile ZIF cheap.
Helms Manual
Helm Inc. http://web.archive.org/web/20260613155229/https://www/.helminc.com The distributor of the Honda Service Manual...
High Cam
in a VTEC motor, the High Cam is used at higher RPMs. This Cam Shaft is generally optimized for power and higherRPMs.
Honda PR3 ECU Reference Guide
Hardware and software reference guide for the OBD0 and OBD1 PR3 DOHC VTEC ECU used in B16A-equipped Integra and Civic mo...
IAB
Intake Air Butterflies a valve that opens and closes to switch between two available passages in the intake manifold.
IAT
See Intake Air Temperature Sensor
Idle Air Control Valve
The Idle air control valve, or IACV regulates the car's idle based on the coolant temperature. Target idle settings vs.
Intake Air Temperature Sensor
The intake air temperature (IAT) sensor and its effect on fueling.
IO
Input / Output lets a MCU talk to other things
JDM
Japanese Domestic Market cars produced for use in Japan Compare to: EDM, USDMNote: JDM OBD1 Civic Integra ECUs generally...
Kehein Indiana Precision Technology
Keihin Indiana Precision Technology (IPT) appear to have designed the Honda ECUs. They have a website.
Knock Replacement
This is one of Dave B's pet projects. The stock honda knock board leaves a lot to be desired. It would be nice to incorp...
Knock Sensor Voltages
Expected signal voltages from the knock sensor on a running engine.
latches
A logic gate that preserves the state of IO lines
Lego Zoo
I try to be cool... http://web.archive.org/web/20050205083030/http://home.insightbb.com:80/~legoz81/ [email protected] L...
Like Pages
Like Pages are pages which share an initial or final word with that page. See also Wiki:LikePages and Meat Ball:LikePage...
Low Cam
In a VTEC motor, the Low Cam is used at low RPMs. Generally, this Cam Shaft is optimized for fuel economy and a smooth i...
MPFI
Multi Port Fuel Injection refers to a fuel injection system with one injector per intake runner, and one intake runner p...
Multi Meter
A peice of test equipment used for measuring voltage, current, resistance, and possibly other electircal quantities and...
NEC uPD7004C Analog-to-Digital Converter
Technical specifications, pinout mapping, and channel routing for the NEC uPD7004C Analog-to-Digital Converter (ADC) chi...
OBD0 & OBD1 VTEC RPM Formula
RPM conversion formula for OBD0 and OBD1 VTEC activation values.
OBD0 8-Bit Rev Limit Formula
8-bit rev limit and engine speed restart formula for OBD0 VTEC Honda ECUs.
OBD0 Fuel
OBD0 fuel formula: a = 2 ^ Column Multiplier pulsewidth in ms = (Dec At Addy + (224/a))/(208/a)
OBD0 Honda PW0 ECU Reference Guide
A complete hardware and software reference guide for the JDM and European OBD0 PW0 DOHC VTEC ECU, featuring ROM address...
OBD0 Ignition Formula
Ignition timing conversion formula for OBD0 Honda ECUs.
OBD1 16bit RPM
If ''x'' is a 16bit RPM value, then: RPM(''x'') = 1875000/''x'' 16bit values are invariably stored in Little Endian form...
OBD1 8-Bit Ignition Advance Formula
Ignition timing advance conversion formula for 8-bit OBD1 Honda ECUs.
OBD1 8bit High Cam RPM
This formula is used to convert values in the high cam table scales to realworld RPMs. If ''x'' is an 8bit highcam scale...