P0120
DTC P0120
Circuit Description
The throttle body assembly contains the following components:
* The throttle blade
* The throttle actuator motor
* The throttle position (TP) sensor 1 and 2
* The throttle actuator control (TAC) module
The TAC system monitors the throttle position with 2 sensors. If the powertrain control module (PCM) receives a message from the TAC module that indicates TP sensor 1 voltage is outside a predetermined range, DTC P0120 will set.
DTC Descriptors
This diagnostic procedure supports the following DTC:
DTC P0120 Throttle Position (TP) Sensor 1 Circuit
Conditions for Running the DTC
* DTCs P0606, P2108, and U0107 are not set.
* The ignition switch is in the crank or the run position.
* The ignition voltage is more than 5.23 volts.
* The communications between the TAC module and the PCM must be valid.
Conditions for Setting the DTC
* The TP sensor 1 voltage is less than 0.376 volts or more than 4.506 volts.
* The PCM learns a minimum throttle position of more than 0.714 volts.
* The TP sensor reference voltage is less than 4.54 volts or more than 5.21 volts.
Action Taken When the DTC Sets
* The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
* The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or the Failure Records.
* The control module commands the TAC system to operate in the Reduced Engine Power mode.
* A message center or an indicator displays Reduced Engine Power.
* Under certain conditions the control module commands the engine OFF.
Conditions for Clearing the MIL/DTC
* The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
* A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
* A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
* Clear the MIL and the DTC with a scan tool.
Test
