2010 Cadillac CTS Sedan AWD V6-3.0L Page 1466
4. 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
Verify none of the following conditions exist:
P0506
* Excess deposits in the Q38 throttle body. Refer to Throttle Body Inspection and Cleaning (See: Powertrain Management/Fuel Delivery and
Air Induction/Throttle Body/Service and Repair/Procedures).
* Restricted exhaust
* Mechanical conditions that limits engine speed
* Parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition.
瀚慖f a condition is found, repair as necessary.
P0507
* Vacuum leaks
* A throttle valve that does not close correctly
* Verify the correct operation of the crankcase ventilation system. Inspect for the following conditions:
- The routing of the positive crankcase ventilation (PCV) system
- Vacuum leaks in the PCV system-Refer to Crankcase Ventilation System Inspection/Diagnosis (See: Powertrain Management/Emission
Control Systems/Positive Crankcase Ventilation/Testing and Inspection).
瀚慖f a condition is found, repair as necessary.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Throttle Body Assembly Replacement (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and
Repair/Removal and Replacement)Throttle Body Assembly Replacement (LLT) (See: Powertrain Management/Fuel Delivery and Air
Induction/Throttle Body/Service and Repair/Removal and Replacement)
P0507
DTC P0506 or P0507 (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
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.
Conditions for Running the DTC
* DTCs P0068, P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171, P0172, P0174, P0175, P0222, P0223,
P0261, P0262, P0264, P0265, P0267, P0268. P0270, P0271, P0273, P0274, P0276, P0277, P0300-P0306, P0351-P0356, P0461-P0464,
P0496, P0627, P0628, P0629, P0722, P1516, P2066-P2068, are not set.
* The barometric pressure (BARO) is greater than 70 kPa.
* The engine coolant temperature (ECT) is greater than 60掳C (140掳F).
