Input Signals
- Engine coolant temperature signal circuit
The E.F.I. engine coolant temperature sensor detects the engine coolant temperature and has a built-in thermistor whose resistance varies according to the engine coolant temperature. The engine coolant temperature is sent to TERMINAL THW of the ECM as a control signal.
- Intake air temperature signal circuit
The intake air temperature sensor is installed in the mass air flow meter and detects the intake air temperature, which is sent as a control signal to TERMINAL THA of the ECM.
- Oxygen sensor signal circuit
The oxygen density in the exhaust emissions is detected and is sent as a control signal from the oxygen sensors to TERMINALS OX1B and OX2B of the ECM.
- RPM signal circuit
The engine RPM is detected by the crankshaft position sensor installed in the cylinder block and the signal is sent to TERMINAL NE+ of the ECM as a control signal.
- Throttle position sensor signal circuit
The throttle body assembly detects the throttle valve opening angle as a control signal, which is sent to TERMINALS VTA1 and VTA2 of the ECM.
- Vehicle speed circuit
The speed sensor detects the vehicle speed, and the signal is sent from TERMINAL SP1 of the skid control ECU with actuator assembly to TERMINAL SPD of the ECM via the combination meter assembly.
- Battery signal circuit
Voltage is constantly applied to TERMINAL BATT of the ECM. When the engine switch is turn the engine switch on (IG), the voltage from the ECM startup power supply is applied to TERMINAL +B and +B2 of ECM via EFI relay.
- Intake air volume signal circuit
The intake air volume is detected by the mass air flow meter, and is sent as a control signal to TERMINAL VG of the ECM.
- Stop light switch signal circuit
The stop light switch assembly is used to detect whether the vehicle is braking or not, and the signal is sent to TERMINAL STP of the ECM as a control signal.
- Starter signal circuit
To confirm whether the engine is cranking, the voltage whish is being applied to the starter assembly when the engine is cranking is detected, and is sent to TERMINAL STA of the ECM as a control signal.
- Engine knock signal circuit
Engine knocking is detected by the knock control sensors, and is sent to TERMINALS KNK1 and KNK2 of the ECM as a control signal.
- Air fuel ratio signal circuit
The air fuel ratio is detected and sent as a control signal to TERMINALS A1A+, A2A+ of the ECM.