Diagnosis for Toyota 1ZZ engine

We can find out the fail of sensors form the engine diagnosis of the lab scope.


1. A black lead of a lab scope is touched the earth and a red lead is connected the sensor signals. And then, I watch the voltage, Hz and duty cycle from the sensors and outputs and I record the values.


Chart of Inputs and Outputs for Toyota 1ZZ

Measure the signals with a multimeter, set to the right setting, and record in the boxes.
  

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Coolant Temperature (THW or ECT) DC volts	Cold engine 3.639 v	Warmed-up engine 1.07 v
Throttle Position Sensor DC volts	Closed throttle 0.611 v	Open throttle 3.881 v
Crank or RPM sensor AC volts and Hertz	Idle rpm 0.03 v, 477.6 Hz	2500 rpm 0.05 v, 1.332 kHz
MAP sensor DC volts	Idle vacuum 0.547 v	No vacuum or key on engine off 1.801 v
Air Temperature (THA or IAT) DC volts	Cold engine 3.621 v	Warmed-up engine 3.07 v
O2 sensor DC volts	Idle 0.005 v	2500 rpm 0.847 v
CAM sensor AC volts & Hertz	Idle rpm 0.15 v, 22.14 Hz	2500 rpm 0.26 v, 58.42 Hz
Fuel Injector Duty cycle %	Idle 1.3%	Acceleration 6.8%
Idle Air Control Duty cycle %	Idle 41.4%	Cranking or 2500 41.4%

2. Diagnosis
A lecturer create a fault under this Toyota diagnosis. I found eight faults in this test.

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	Faulty sensor or output	Lab Scope	Engine Condition described
1	Injector #4	Wrong duty cycle in #4 cyl	The engine run roughly with vibration.
2	TPS	No voltage. When the throttle was closed and opened, the voltage does not go up and down.	The engine still run but the engine does not run appropriately, when I open the throttle. The sensor voltage dose tell the ECU wrong values for the fuel injection.
3	MAP Sensor	The voltage does not move	The engine does not run appropriately from the wrong signal of the vacuum sensor.
4	Crank Position Sensor	No frequency, AC voltage	The engine stopped completely. No fuel injection and ignition.
5	Cam Position Sensor	No frequency, AC voltage	The engine stopped completely. No fuel injection and ignition.
6	O2 Sensor	No voltage values in the idling and acceleration	The engine does not run appropriately from the wrong signal of O2 sensor.
7	Injector #4	Wrong duty cycle in #4 cyl	The engine run roughly with vibration.
8	Cam Position Sensor and injector #4	No frequency, AC voltage and no supplied voltage of injector #4	The engine stopped completely. No fuel injection and ignition. In addition, there were two problems in this engine.