Question about 2002 Nissan Xterra

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I have a 2002 nissan x trail currently off the road with a fault code of P0120 (Throttle position sensor) Both potentiometers read normal output voltage when throttle moved, however betwen the switch pins there is a fluctuating resistance of between 200-350 ohms in the throttle relaxed position. This goes to open circuit ( as it should do) when throttle is depressed, my question is - is this normal, if not what should it be and if it is correct what else could be causing the problem? Thanks in advance.

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  • Nissan Master
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If you can get a good scanner plugged into it, you can read the TPS as you slowly depress the throttle to see if it has a dead spot. This is the best way to view the TPS as well as the communication to the computer. You will see it "count" up on the scanner screen.

Posted on Oct 08, 2009

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What can cause the check engine light to be on?


Circuit Range Performance error.

When is the code detected? Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM. Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) P0121 CHEVROLET Description The throttle position sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM. Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

Read more: https://www.autocodes.com/p0121_chevrolet.html


https://www.autocodes.com/p0121_chevrolet.html

chevrolet code was P0121 Google Search

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1 Answer

Code po120


P0700: TCU Request For MIL On https://www.autocodes.com/p0700_kia.html

P0120: Throttle/Pedal Position Sensor/Switch 'A' Circuit https://www.autocodes.com/p0120.html

P1121: Throttle Position Sensor Signal Invalid https://www.autocodes.com/p1121_kia.html

P0122: Throttle/Pedal Position Sensor 'A' Circuit Low Input https://www.autocodes.com/p0122_kia.html

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I need to know the code po120


Throttle Position Sensor/Switch (TPS) A Circuit Malfunction
The TPS (Throttle Position Sensor) is a potentiometer that is mounted to the throttle body. It detects the throttle blade angle. As the throttle blade moves, the TPS sends a signal to the PCM (Powertrain Control Module). Usually a three wire sensor: A 5 volt reference from the PCM to the TPS, a ground from the PCM to the TPS, and a signal return from the TPS to the PCM. The TPS sends the throttle position information back to the PCM on this signal wire. When the throttle is closed the signal is near .45 volts. At WOT (Wide Open Throttle) the TPS signal voltage will approach a full 5 volts. When the PCM sees a voltage that is outside of normal operating range, P0120 will set. NOTE: The PCM knows that any large change in throttle position means a cooresponding change in manifold pressure (MAP). On some models the PCM will monitor MAP and TPS operation for comparison. Meaning that if the PCM sees a large percentage change in throttle position, it expects to see a cooresponding change in manifold pressure and vice versa. If it doesn't see this comparitive change, P0120 may set.

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Codes 32 75 12 22 on a check engine light


first code it's P0320 Possible causes
- Faulty Ignition/Distributor engine speed sensor
- Faulty Crankshaft Position sensor
- Ignition/Distributor engine speed sensor harness is open or shorted
- Ignition/Distributor engine speed sensor circuit poor electrical connection
- Low battery charge
- Faulty Engine Control Module (ECM)


Read more: http://engine-codes.com/p0320_ford.html#ixzz3DcwddSlp
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Read more: http://engine-codes.com/p0750_ford.html#ixzz3DcwoXS73
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- Faulty Throttle Position Sensor
- Throttle Position Sensor circuit is open or shorted
- Throttle Position Sensor poor electrical connection


Read more: http://engine-codes.com/p0120.html#ixzz3Dcx3VCPs
4- P0220 Possible causes
- Throttle Position Sensor (TPS) harness is open or shorted
- Throttle Position Sensor (TPS) circuit poor electrical connection
- Faulty Throttle Position Sensor (TPS)
- Fault Electric Throttle Control Actuator (or Throttle Body Motor)
- Accelerator Pedal Position Sensor (APP)


Read more: http://engine-codes.com/p0220.html#ixzz3DcxGUMl4

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Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement.


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Read more: http://engine-codes.com/p2135_ford.html#ixzz2LBgiF38q

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Read more: http://engine-codes.com/p0120.html#ixzz26UJQOULD

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Here is the definition. You may need to have someone check the accelerator pedal position sensor and the circuit.

P2138 NISSAN Description The Accelerator Pedal Position (APP) sensor is installed on the upper end of the accelerator pedal assembly. The sensor detects the accelerator position and sends a signal to the Engine Control Module (ECM).
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Read more: http://engine-codes.com/p2138_nissan.html#ixzz26J3D2x8s

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