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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 CTS 🢒 Accessories 🢒 Navigation Systems 🢒 DTC P0507

Circuit Description

The throttle actuator control (TAC) system uses vehicle electronics and components to calculate and control the position of the throttle plate. In order to decrease idle speed the TAC system closes the throttle plate, reducing air flow into the engine. In order to increase idle speed the TAC system opens the throttle plate allowing more air flow into the engine. If the actual idle RPM does not match the desired idle RPM within a calibrated time, this code sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0507 Idle Speed Low

Conditions for Running the DTC
    • DTCs P0068, P0641, P0651, P0455, P2135, P0107, P0108, P0112, P0113, P0117, P0118, P0125, P0171, P0172, P0200, P0300, P0336, P0440, P0442, P0446, P0452, P0453, P0502, P0503, P0120, P0220, P2101, P1516, or P2135 are not set.
    • The engine is operating for more than 60 seconds.
    • The engine coolant temperature (ECT) is more than 60°C (140°F).
    • The intake air temperature (IAT) is more than -10°C (14°F).
    • The barometric pressure (BARO) is more than 65 kPa.
    • The system voltage is between 9-18 volts.
    • The vehicle speed is less than 1.7 km/h (1 mph).
    • DTC P0507 runs continuously once the above conditions are met.

Conditions for Setting the DTC

The powertrain control module (PCM) detects the actual idle speed is 200 RPM more than the desired idle speed for 5 continuous seconds.

Action Taken When the DTC Sets
    • The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
    • The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data.

Conditions for Clearing the MIL/DTC
    • The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has run and passed.
    • The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
    • The DTC can be cleared by using a scan tool.

Diagnostic Aids

If the condition is intermittent, refer to Intermittent Conditions .

Test Description

The number below refers to the step number in the diagnostic table.

  1. This test determines whether the engine can achieve the commanded RPM. If the engine does not reach the commanded RPM, the test determines whether the RPM is too high or too low.

Step

Action

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Powertrain Control Module Connector End Views and Engine Controls Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Start the engine.
  2. Command the engine speed to 1,500 RPM, then to 500 RPM, and back to 1,500 RPM with a scan tool.
  3. Exit the RPM control function.

Does the engine speed correspond, within 200 RPM, with each command?

Go to Intermittent Conditions

Go to Step 3

3

Inspect for the following conditions:

    • Vacuum leaks
    • Excessive deposits in the throttle body
    • A faulty positive crankcase ventilation (PCV) valve

Did you find and correct the condition?

Go to Step 4

--

4
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. 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.

Did the DTC fail this ignition?

Go to Step 2

Go to Step 5

5

Important: Be aware that repairing 1 individual condition may correct more than 1 DTC.

Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?

Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information

System OK