Make Toyota
Signal Name TSP
Volt/division/range 1V
Time/division/range 200 ms
Draw the pattern below:
Explain the operation of the sensor or device using the Graph:
(Use arrows at different points, and describe what happens there)
Arrow B = Represent at the idle voltage.
Arrow C = Where is the TSP opening and increase voltage.
Arrow D = Where the throttle body is wide open in this is the minimum voltage .
Arrow E = Where the throttle body is closing and reduces the voltage.
Explain in detail an electrical fault that would make this unit operate incorrectly
Sludgation or dirt will effect the operation of this unit.
Explain why this condition would cause this unite to malfunction/ Use mathematical equations to back up your explanation.
The throttle body does not react to the voltage increase, because of the dirt and it stuck, and will not give the right voltage and ECU will get the wrong voltage reading and the engine may run rough (lean or reach) it will depend on the voltage.
Calculation:
If we have excessive voltage drop of the TPS to the ECU will not get a proper return voltage.
Ie: If variable resistor is 1K ohms and the resistance in PCM is 1000 ohms then the total current will be:
V=5 V
IT = V/R = 5/2000 ohms = 0.0025 A
The voltage drop in variable resistor is:
V = IR = 0.0025A *1000 = 2.5 V
This is the signal voltage the ECU, will get. If there is excessive voltage drop due to dirt, bad earth, this 2.5 V drop will decrease and the ECU will get wrong signal.
Explain how this condition would affect the operation of the vehicle?
As we open the throttle, the voltage increases accordingly, but if there is bad sensor if will drop in voltage .
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