TPS Relationships
· cold 0.3mv
· crank 0.3mv
· idle 0.4mv
· rev 5.6mv
The Throttle Position Sensor differs in voltage every time the TPS is moved. This sensor is an important device on the throttle body and senses the angle of the throttle position which allows a controlled amount of air to flow through. Each time the throttle position is changed it sends a signal to the ECU which gets processed and controls the fuel injector and keeps them grounded for a longer period.
THW / ECU Relationships
· cold 0.0mv
· crank 0.0mv
· idle 0.3mv
· rev 0.4mv
The water temperature voltage increases during the motor is on idle and remains too slowly increase throughout the duration of the running time. 0.0mv when cold to 0.03mv at idle. In relationship to the THW and the ECU the THW detects the water temperature heat and sends the signal to the ECU which processes the temperature reading to determine how long the engine has been running for and also to see if the engine is overheating so the ECU can activate the radiator cooling fans.
ECU
THW
Injector Hz %
When I connected the multimeter in Hz to the fuel injector ports I obtained different reading for conditions when the engine was cold and not running 0.000Hz.When the engine is on crank 0.002Hz, 0.033Hz on idle and 0.052Hz on high revs.I also found out the reading for the duty cycle In the following list cold 2.3%, 4.5% on crank, 4.7% idle and 9.6% on high revs.
Fuel injector
Closed loop
The closed loop control system work during idle and cursing mode the system works on readings from the exhaust gasses such as HC, CO, NOx. During the closed loop the ECU controls air/fuel adjustments to keep it to a 14.7 ratio (stoichiometry). However in a open loop if the car would be running to rich the exhaust fumes could be giving of excess NOx which could damage the honeycomb inside the catalytic converter which removes harmful gas mixtures.
Catalytic Converter
Catalytic Converter
