2010 Cadillac CTS Sedan AWD V6-3.6L Page 1477
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Engine operating, command the engine speed up to 1,400 RPM, down to 600 RPM, up to 1,400 RPM, and then exit using the scan tool. The engine
speed should steadily increase and decrease as commanded.
If the idle does not increase or decrease steadily, verify that none of the following conditions is present:
* Vacuum leaks
* The throttle valve for the correct operation-A throttle valve that does not close correctly sets this DTC.
* Restricted air intake system
* The throttle body for damage and/or tampering
* Incorrect or malfunctioning PCV system
* Excess deposits in the throttle body
* A parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition
瀚慠epair the condition as necessary.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
P0507
DTC P0506, P0507, or P050A (Without LF1)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0506
- Idle Speed Low
DTC P0507
- Idle Speed High
DTC P050A
- Cold Start Idle Air Control System Performance
Circuit/System Description
The throttle actuator control (TAC) motor is a DC motor that is part of the throttle body assembly. The TAC motor drives the throttle valve. The
engine control module (ECM) controls the TAC motor based on throttle position sensor input. The idle speed is controlled by the ECM based on
various inputs. The ECM commands the TAC motor to open or close the throttle valve in order to maintain the desired idle speed. If the ECM
detects the actual idle speed is not within a predetermined range of the desired idle speed, this DTC sets.
Conditions for Running the DTC
P0506 and P0507
* DTC P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0221, P0222, P0223, P0442, P0443, P0446, P0455,
P0458, P0459, P0496, or P0700 is not set.
* The engine is operating for greater than 4 seconds.
* The engine load is between 32-75 percent, for P0506 or manual transmission only.
* The engine coolant temperature (ECT) is warmer than -11掳C (+13掳F).
* The intake air temperature (IAT) is warmer than -11掳C (+13掳F).
* The vehicle speed is 0 km/h (0 mph) and accelerator pedal position (APP) input is at 0 percent.
* The EVAP intrusive leak test is not enabled.
* The cold start idle speed control is not active.
* The evaporative emission (EVAP) canister purge valve command less than 40 percent.
* A vehicle speed was detected prior to the diagnostic running.
