Electronic D

Electronic D

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Question Answer
ABS Anti locking breaksComp controls breaking applications to prevent wheel lock up
PCM Powertrain control moduleCars main computer responsible to run the powertrain components
TCM Traction control moduleManages control for wheel slip
BCM Body control moduleManages cruise control, fuel data, twilight sensor, odometer
SCM Suspension control moduleControls ride stiffness and shock absorber
ECM Monitors all functions to ensure an engines optimal performance
ECT Coolant tempCoolant temp for loop status and coolant fan
CKP Crankshaft position Crank position for spark timing
RPM Engine speedDetects crankshaft speed
KS Knock sensorDetects detonation in engine
MAP Manifold Absolute PressureIntake manifold vacuum
MAF Mass air flow Flow rate of air entering the engine for fuel calculations
IAT Intake air tempIntake air temp for fuel calculations
BARO Barometric pressure Barometric pressure for fuel calculations
BPP Break pedal position Brake conditions for cruise control and shift lever lock
EVT
EGR valve positionHow much the EGR valve is open
O2S Exhaust gas oxygen Tells if engine is running rich or lean
TPS Throttle position sensor Position angle of the throttle plate
B+ System voltageBattery
PNP Park neutral position Tells if transmission is in park, neutral, or drive gear
TR Transmission Trams gear
VSS Vehicle speedVehicle wheel speed
Voltage signal characteristics Level, waveform, speed
Mechanical switches are Simplest sensorPassive sensor that provides an off and on digital signal
When a mechanical switch is on the power side of the circuit it reacts now It has to be closed for the voltage to flow
When a mechanical switch is on the ground side of the circuit it reacts how The switch must be closed to sense voltage
What is the purpose of the brake on off switch Mechanical switch that tells the computer to cycle off the cruse control or to release the torque converter clutch to prevent the engine from stalling
Piezoelectric sensors are used To sense detonation(shock waves)
Knock sensors produce what signal Ac analog signal
What does a map (manifold air pressure sensor) detects Pressure changes in the intake manifold
How does the computer use the map sensor signals AdJust ignition dry timing and air fuel ratio
Under what condition does the knock sensor produce a voltage signal Under pressure or strain
How does the computer use a knock sensor signals Retard ignition timing
What is a thermistors Are heat sensitive resistors that change there resistance and voltage signals as temperatures change
What does the iat intake air temperature sensor detect The temperature of the incoming air charge
ECT Engine cooling temperatureTemp of engine
Potentiometer is a Variable resistor
Where is the TPS throttle position sensor mountain On the side of the throttle body
When the throttle is close the TPS sensor sends a Low voltage signal to the computer
On the throttle is wide open with the TPS sends a A high voltage signal
In what 2 ways is a rheostat different than a potentiometer Instead of three contacts it only has 21 contact is fixed the other one slides across the resistorRheostat changes the current flow
What is a magnetic position sensor MPS A magnetic triggering device that produces a signal based on the principles of induction
What two elements increase in decrease depending depending on the wheel is rotating speed in a magnetic position sensor Amplitude or voltage and frequency
Which magnetic position sensor monitor is the rotation speed CKP crankshaft position
What magnetic position sensor signal to help the computer determine when to start sequential firing of the fuel injectors CMP
How are permanent magnet generator is different then hall affect sensors Permanent magnets generates active AC signal wave analogHall affects passive DC digital square wave
Tiss or toss sensors are mounted beside the Transmission case
What happens when a shutter blade blocks the magnetic field from the hall sensor Voltage goes up
What happens when the gap in the blade is between the magnet in the hall sensor Voltage goes down
In a hall sensor as the steel shutter turns what kind of voltage signal is sent to the computer D.C. Digital
Optical sensor, as the wheel rotates and a gap allows the light been through, the sensor sends what to the computer Low voltage signal
What is the purpose of an oxygen sensor To the tech the oxygen content in the exhaust system
If an engine is running rich it has More oxygen and 450 mV or higher
If an engine is running lean it has Less oxygen 450mV or less
Titania oxygen sensors or wideband O2 sensors contain Semi conductormaterial that changes resistance based on the oxygen content in exhaust
If an engine is running too rich the sensor resistance is Low
If an engine is running to lean the sensor resistance is High

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