Circuit Description
The commanded throttle position is compared to the actual throttle position. Both values should be within a calibrated range of each other. The engine control module (ECM) continuously monitors the commanded and actual throttle positions. If the ECM detects that the difference in these values are greater than the calibrated range, DTC P2101 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2101 Throttle Actuator Position Performance
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The system is not in Battery Saver Mode. |
| • | DTC P0068 is not set. |
| • | The battery voltage is more than 8 volts. |
| • | DTC P2101 runs continuously when the above conditions are met. |
Conditions for Setting the DTC
The difference between the predicted and the actual throttle position is more than a calibrated amount for more than 0.6 second.
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. |
Diagnostic Aids
| • | Inspect for a condition in which the throttle valve may have been held open. |
| • | Inspect for conditions in which ice may have formed in the throttle bore. |
| • | If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections . |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module Connector End Views | ||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||
2 | Observe the DTC information. Are DTCs P0120, P0220 or P2135 also set? | -- | Go to Step 3 | |||||||
Did you find any of these conditions with the throttle body? | -- | Go to Step 11 | Go to Step 4 | |||||||
4 |
Important: Disconnecting the throttle body connector will cause additional codes to set.
Is the voltage more than the specified value for both circuits? | 11 V | Go to Step 8 | Go to Step 5 | ||||||
5 | Is the voltage less than the specified value? | 2 V | Go to Step 7 | Go to Step 6 | ||||||
6 | Test the TAC motor control circuit that measured above the specified value for a short to voltage. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 8 | ||||||
7 | Test the TAC motor control circuit that measured below the specified value for a short to ground. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 | ||||||
8 | Test the TAC motor control 1 and TAC motor control 2 circuits for high resistance. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 9 | ||||||
9 | Test for a poor connection or terminal tension at the throttle body connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 11 | ||||||
10 | Test for a poor connection or terminal tension at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 12 | ||||||
11 | Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||
12 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||
13 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 14 | ||||||
14 | Observe the Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |||||||
