With the ignition off, disconnect the block of the engine management system wiring harness from the throttle position sensor (see Removing the Throttle Position Sensor).
To check the power supply circuit of the sensor..
... we connect the tester probes to the terminals "A" and "B" of the block.
With the ignition on, the device should detect a voltage of 4.5–5.5 V.
In the absence of voltage, check the health of the circuit (open and short to ground) between terminal "M32" of the ECU harness block and terminal "A" of the wiring harness block ("+" power). We also check the circuit between the "M64" terminal of the ECU harness block and the "B" terminal of the block - sensor grounding.
We check the health of the circuit between the terminal "M6" of the ECU harness block and the terminal "C" of the wiring harness block.
If the circuits are working, and the voltage is not correct, the computer is faulty.
To check the sensor, we connect the block of the wiring harness to it.
From the side of the input of the wires into the block, we insert into its sockets corresponding to the conclusions "A" and "C", two pieces of wire (or needles), so that there is contact between them and the wire leads.
We connect the tester probes to the wire segments.
With the ignition on, we measure the voltage between terminals "A" and "C". For a working sensor, with the throttle closed, the voltage should be 3.9–4.9 V, and with the throttle open, it should be 0.1–0.9 V.
If the sensor output voltage is outside the specified ranges, the sensor must be replaced.