Sensors 1 Flashcards
Where is the throttle position sensor located
Adjacent to the throttle level
What is the voltage on a throttle position sensor at idle
Roughly 0.5 volts
What is the voltage of the throttle position sensor at WOT
4.5 volts
What does the PCM adjust with the throttle position sensor
Fuel mixture and ignition timing
What is a common fault with throttle position sensors
Burns a hole in the resister and causes a hesitation
What does the ECT measure
Engine temperature
What is the mixture of air to fuel when car is cold
Rich to prevent stalling
Where is the engine coolant temp sensor located
Near the thermostat housing
Negative temperature coefficient
Decreases in resistance as the temperature of the sensor increases
What does a stepped resister do
Broadens the range of the ECT
How many wires are there on a throttle position sensor
3 wire potentiometer
What will a broken ECT read
-40 degrees F
How many wires on an ECT
2
What does a heated oxygen sensor measure
Oxygen content of the exhaust
Pre-CAT adjusts…..
Fuel mixture
Post-CAT monitors…..
CAT efficiency
Pre cat volts
.1 to .9 volts .9 being rich
Post cat volts
.4 to .6
Zirconia HO2 sensor has how many wires
1
Titania HO2 sensor has how many wires
4
What can cause a false lean code
Exhaust leak
What happens to HO2 sensors over time
Get lazy and slow
What does a wide band O2 sensor read and how many wires
The air to fuel ratio and 5wires
Closed loop is above how many degrees
160
