P0507

DTC P0507

CIRCUIT DESCRIPTION
The throttle actuator control (TAC) motor is controlled by the engine control module (ECM). The DC motor located in the throttle body drives the throttle plate. In order to decrease idle speed, the ECM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the ECM commands the throttle plate open allowing more air to pass the throttle plate. If the actual idle RPM does not match the desired idle RPM within a calibrated time, this DTC will set.

CONDITIONS FOR RUNNING THE DTC
- DTCs P0112, P0113, P0117, P0118, P0120, P0122, P0123, P0125, P0128, P0220, P0222, P0223, P0442, P0446, P0452, P0453, P0455, P0502, P2135 are not set.
- The engine is operating for at least 2 seconds.
- The engine coolant temperature (ECT) is more than 81°C (178°F).
- The intake air temperature (IAT) is more than 32°C (90°F).
- The vehicle speed is 0 mph.

CONDITIONS FOR SETTING THE DTC
- The actual idle speed is approximately 200 RPM greater than the desired idle speed.
- The above condition is present for 2 seconds.

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.OR
- Under certain conditions the control module commands the engine OFF.
- The message center displays Reduced Engine Power.

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 DESCRIPTION

Steps 1 - 5:

The number below refers to the step number on the diagnostic table.
2. This test determines whether the engine can achieve the commanded RPM.