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 2 voltage is outside a predetermined range, the reference voltage is out of range, or an improper throttle blade minimum position was learned, DTC P0220 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0220 Throttle Position (TP) Sensor 2 Circuit
Conditions for Running the DTC
| • | DTCs P0606, P2107, P2108 are not set. |
| • | The ignition switch is in the crank or the run position. |
| • | The Ignition 1 Signal parameter 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 2 voltage is less than 0.282 volts or more than 4.6 volts for longer than 100 ms. This test occurs continuously. |
| OR |
| • | The PCM learns a minimum throttle position of less than 0.282 volts or more than 0.813 volts. This test occurs once per ignition cycle at power-up. |
| OR |
| • | The TP sensor reference voltage is between 4.54-5.21 volts for longer than 10 ms. This test runs continuously. |
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. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate voltage within the specified range? | 1.1-1.5 V | Go to Step 3 | Go to Step 5 |
3 | Fully depress the accelerator pedal. Does the scan tool indicate the voltage is within the specified values? | 3.7-4.2 V | Go to Step 4 | Go to Step 5 |
4 |
Did this DTC fail this ignition? | -- | Go to Step 5 | Go to Testing for Intermittent Conditions and Poor Connections |
5 | Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement? | -- | Go to Step 6 | -- |
6 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 7 |
7 |
Important: Be aware that repairing one individual condition may correct more than one DTC. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |
