2010 Cadillac CTS Sedan AWD V6-3.6L Page 1475
circuits/connections test normal, replace the vehicle speed sensor.
3. Measure for more than 10 ohms of resistance between the VSS high signal circuit terminal 66 and ground.
瀚慖f the value is less than the specified range, repair the short to ground.
4. Measure for more than 10 ohms of resistance between the VSS low signal circuit terminal 67 and ground.
瀚慖f the value is less than the specified range, repair the short to ground.
5. Reconnect the ECM connector. Disconnect the VSS connector.
6. Ignition ON, test the VSS high signal circuit terminal B for a short to voltage.
瀚慖f all circuits/connections test normal, test or replace the VSS.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Vehicle Speed Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Sensors and Switches - Computers and
Control Systems/Vehicle Speed Sensor/Service and Repair/Tremec 6-Speed - Manual Transmission)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming
P0506
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.
* DTC P0506 and P0507 run continuously once the above conditions are met for greater than 10 seconds.
