ECU

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US Models have the following input sensors: US Models have the following input sensors:
-HO2S Left oxygen sensor+*HO2S Left oxygen sensor <br>
HO2S Right oxygen sensor HO2S Right oxygen sensor
-MAP sensor+MAP sensor <br>
-CKP 1 crank sensor position 1+CKP 1 crank sensor position 1 <br>
-CYP 2 crank sensor position 2+CYP 2 crank sensor position 2 <br>
-CYP 1 cylinder sensor position 1+CYP 1 cylinder sensor position 1 <br>
-CYP 2 cylinder sensor position 2+CYP 2 cylinder sensor position 2 <br>
-KS Left Knock Sensor+KS Left Knock Sensor <br>
-KS Right Knock Sensor+KS Right Knock Sensor <br>
-EGR valve lift sensor+EGR valve lift sensor <br>
-Atmospheric pressure/barometer+Atmospheric pressure/barometer <br>
-VSS Speed sensor+VSS Speed sensor <br>
-TPS Throttle position+TPS Throttle position <br>
-PSP Power Steering Pressure (idle up)+PSP Power Steering Pressure (idle up) <br>
-ECT Engine coolant temp+ECT Engine coolant temp <br>
-IAT Air Intake temp+IAT Air Intake temp <br>
-Ignition timing adjuster+Ignition timing adjuster <br>
-Clutch switch, negative input+Clutch switch, negative input <br>
-Neutral switch, +Neutral switch, <br>
-Brake switch, positive input+Brake switch, positive input <br>
-Starter signal, positive input+Starter signal, positive input <br>
-Service check connector, negative input+Service check connector, negative input <br>
Outputs Outputs
-Main relay+Main relay <br>
-Reverse lockout relay+Reverse lockout relay <br>
-EGR control solenoid (pwm), negative output+EGR control solenoid (pwm), negative output <br>
-Fuel pressure regulator solenoid, negative output+Fuel pressure regulator solenoid, negative output <br>
-VIS high solenoid+VIS high solenoid <br>
-Vis low solenoid+Vis low solenoid <br>
-Pair valve solenoid+Pair valve solenoid <br>
-MIL Check engine light+MIL Check engine light <br>
-Fuel Injectors 1-6, negative switched output+Fuel Injectors 1-6, negative switched output <br>
-Ignition control module+Ignition control module <br>
-Left and Right oxygen sensor heaters+Left and Right oxygen sensor heaters <br>
-IAC Idle Air Control Valve+IAC Idle Air Control Valve <br>
-Alternator Field+Alternator Field <br>
-Oxygen sensor heaters+Oxygen sensor heaters <br>
-Fan control unit+Fan control unit <br>
-A/C clutch+A/C clutch <br>
-Tachometerf+Tachometer <br>
-EVAP purge solenoid valve+EVAP purge solenoid valve <br>

Revision as of 22:13, 2 March 2009

Hardware

The Legend is equipped with a 16bit ECU manufactured by Matsushita Industries in Japan (better known for it's subsidiary in the US, Panasonic) for Honda Motor Company. It is equivalent to other Honda OBD1 setups in that it uses the same wiring connectors and wiring layout. Unlike the OBD1 Civic and Integras, there is no external provision for code scanning or datalogging. On automatic transmission cars, the transmission control unit (TCU) is integrated on a separate daughter board in the ECU case. When equipped with an automatic, the engine computer is referred to by Honda as a PCM (power train control module) instead on an ECM (engine control module).

US Models have the following input sensors:

  • HO2S Left oxygen sensor

HO2S Right oxygen sensor MAP sensor
CKP 1 crank sensor position 1
CYP 2 crank sensor position 2
CYP 1 cylinder sensor position 1
CYP 2 cylinder sensor position 2
KS Left Knock Sensor
KS Right Knock Sensor
EGR valve lift sensor
Atmospheric pressure/barometer
VSS Speed sensor
TPS Throttle position
PSP Power Steering Pressure (idle up)
ECT Engine coolant temp
IAT Air Intake temp
Ignition timing adjuster
Clutch switch, negative input
Neutral switch,
Brake switch, positive input
Starter signal, positive input
Service check connector, negative input

Outputs Main relay
Reverse lockout relay
EGR control solenoid (pwm), negative output
Fuel pressure regulator solenoid, negative output
VIS high solenoid
Vis low solenoid
Pair valve solenoid
MIL Check engine light
Fuel Injectors 1-6, negative switched output
Ignition control module
Left and Right oxygen sensor heaters
IAC Idle Air Control Valve
Alternator Field
Oxygen sensor heaters
Fan control unit
A/C clutch
Tachometer
EVAP purge solenoid valve


The ECU went through a major revision in 1993 with a revised main board and auto transmission board. The coding in the chip changed

Main Board Layout

IC 401 Microprocessor (MCU)

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