P0506
DTC P0506 or P0507
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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°C (140°F).
* The engine run time is greater than 60 s.
* The ignition voltage is between 11-32 V.
* The transmission is not changing gears.
* The torque converter clutch (TCC) is not changing states.
* The intake air temperature (IAT) is warmer than -20°C (-4°F).
* The vehicle speed is less than 3 km/h (2 mph).
* The commanded engine speed is steady within 25 RPM.
* The engine is idling for greater than 5 s.
* The DTCs run when the above conditions are met.
Conditions for Setting the DTC
P0506
The actual engine speed is 94 RPM less than the desired idle speed for 10 s.
P0507
The actual engine speed is 188 RPM greater than the desired idle speed for 10 s.
Action Taken When the DTC Sets
DTCs P0506 and P0507 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0506 and P0507 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector Views
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify there are no other DTCs set.
• If any other DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
• If no other DTCs are set
3. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %.
• 90 % or greater
Refer to Throttle Body Inspection and Cleaning Procedures.
• If less than 90 %
4. Engine Idling at the normal operating temperature.
5. Verify the actual Engine Speed is not 100 RPM less than the Desired Idle Speed.
• If 100 RPM less than the Desired Idle Speed
Refer to Circuit/System Testing
• If 100 RPM greater than the Desired Idle Speed
6. Verify the actual Engine Speed is not 200 RPM greater than the Desired Idle Speed.
• If 200 RPM greater than the Desired Idle Speed
Refer to Circuit/System Testing
• If 200 RPM less than the Desired Idle Speed
7. 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 data.
8. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing
• If the DTC does not set
9. All OK
Circuit/System Testing
Verify the conditions listed below do not exist:
P0506
* Restricted exhaust
* Mechanical conditions that limits engine speed
* Parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition.
• If 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 conditions listed below:
- The routing of the positive crankcase ventilation (PCV) system
- Vacuum leaks in the PCV system-Refer to Crankcase Ventilation System Inspection/Diagnosis Testing and Inspection.
• If a condition is found, repair as necessary.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Throttle Body Assembly Replacement Removal and Replacement