Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
DTC Descriptors
DTC P0120: Throttle Position (TP) Sensor 1 CircuitDTC P0220: Throttle Position (TP) Sensor 2 Circuit
DTC P2135: Throttle Position (TP) Sensor 1-2 Correlation
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
TP Sensor 1 Signal | P0122 | P0122, P2135, | P0123 | P0068, P0121 |
TP Sensor 1 and 2 5-Volt Reference | P0651 | P0122, P0222, P2135 | P0651, P2135 | -- |
TP Sensor 1 and 2 Low Reference | -- | P0123, P0223, P2135 | -- | -- |
TP Sensor 2 Signal | P0222 | P0223, P2135 | P0223 | P0068, P0121 |
Typical Scan Tool Data
TP Sensor 1
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine Running Parameter Normal Range: 0.38-4.51 V | |||
TP Sensor 1 Signal | 0 V | 0 V | 5 V |
TP Sensor 5-Volt Reference | 0 V | 0 V | 5 V |
TP Sensor Low Reference | -- | 5 V | -- |
TP Sensor 2
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine Running Parameter Normal Range: 0.28-4.60 V | |||
TP Sensor 2 Signal | 0 V | 5 V | 5 V |
TP Sensor 5-Volt Reference | 0 V | 0 V | 5 V |
TP Sensor Low Reference | -- | 5 V | -- |
Circuit/System 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.
Conditions for Running the DTC
P0120 and P0220
| • | DTCs P0606, P2108, U0107 are not set. |
| • | The system voltage is more than 5.23 volts. |
| • | The ignition is in the Crank or Run position. |
| • | DTCs P0120 and P0220 run continuously when the above conditions are met. |
P2135
| • | The system voltage is more than 5.23 volts. |
| • | The ignition is in the Crank or Run position. |
| • | DTCs P0606, P2108, U0107 are not set. |
| • | DTC P2135 runs continuously when the above conditions are met. |
Conditions for Setting the DTC
P0120
| • | TP sensor 1 voltage is less than 0.376 volt or more than 4.506 volts. |
| • | The PCM learns a minimum throttle position of more than 0.714 volt. |
| • | The TP sensor reference voltage is less than 4.54 volts or more than 5.21 volts. |
P0220
| • | The TP sensor 2 voltage is less than 0.282 volt or more than 4.6 volts. |
| • | The PCM learns a minimum throttle position of more than 0.813 volt. |
| • | The TP sensor reference voltage is less than 0.5 volt. |
P2135
| • | The throttle position indicated by TP sensor 1 disagrees with the throttle position indicated by TP sensor 2 by more than 6 percent. |
| OR |
| • | The PCM learned minimum throttle position of TP sensor 1 disagrees with the learned minimum throttle position of TP sensor 2. |
| OR |
| • | The PCM detects that the TP sensor 1 signal circuit is shorted to the TP sensor 2 signal circuit. |
Action Taken When the DTC Sets
| • | DTCs P0120, P0220, and P2135 are Type A DTCs. |
| • | The control module commands the TAC system to operate in the Reduced Engine Power mode. |
Conditions for Clearing the MIL/DTC
DTCs P0120, P0220, and P2135 are Type A DTCs.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Throttle Actuator Control (TAC) System Description
Electrical Information Reference
| • | Circuit Testing |
| • | Wiring Repairs |
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Turn ON the ignition with your foot off the accelerator pedal. Observe the TP sensor 1 voltage parameter on the scan tool. The reading should be between 0.38-0.71 volt.
- Ignition ON, observe the TP sensor 2 voltage parameter on the scan tool. The reading should be between 0.28-0.81 volt.
- Ignition ON, observe the scan tool TP sensor 1 voltage parameter. The reading should be between 0.71-4.51 volts and change with accelerator pedal input.
- Ignition ON, observe the scan tool TP sensor 2 voltage parameter. The reading should be between 0.81-4.60 volts and change with accelerator pedal input.
- Ignition ON, observe the scan tool TP sensor 1 and 2 parameter. The scan tool should indicate Agree.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Replace the throttle body.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
