Circuit Description
The engine control module (ECM) controls the throttle valve by applying a varying voltage to the throttle actuator control (TAC) motor. The ECM monitors the actual throttle valve position using throttle position (TP) sensor 1 and 2. The ECM amplifies the TP sensor 1 signal in order to obtain a more accurate signal. The ECM monitors the TP sensor 1 amplification output whenever the ignition is ON and a closed throttle test is performed. If the ECM detects the internal TP sensor 1 amplification output does not correlate with the TP sensor 1 signal voltage, this DTC sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2107 Throttle Actuator Control (TAC) Module Internal Circuit
Conditions for Running the DTC
| • | The vehicle speed is 0 km/h (0 mph). |
| • | The engine speed is less than 40 RPM. |
| • | The engine coolant temperature (ECT) is 5-85°C (41-185°F). |
| • | The intake air temperature (IAT) is 5-60°C (41-140°F). |
| • | The ignition 1 voltage is more than 10 volts. |
| • | The accelerator pedal position (APP) is less than 15 percent. |
| • | The ECM is performing the closed throttle test with the ignition ON and the engine OFF. |
| • | DTC P2107 runs once the above conditions are met during the throttle actuator control system initialization. |
Conditions for Setting the DTC
The ECM detects the internal TP sensor 1 amplification output does not correlate with the TP sensor 1 signal voltage.
Action Taken When the DTC Sets
| • | The control module stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. |
| • | The driver information center, if equipped, may display a message. |
Conditions for Clearing the DTC
| • | 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 non-emission related diagnostic. |
| • | Clear the DTC with a scan tool. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine 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 display DTC P2107 failed this ignition cycle? | Go to Step 4 | Go to Step 3 |
3 |
Did the DTC fail this ignition? | Go to Step 4 | Go to Intermittent Conditions |
4 | Replace the engine control module (ECM). Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 5 | -- |
5 |
Did the DTC fail this ignition? | Go to Step 2 | Go to Step 6 |
6 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | System OK | |
