P0506
DTC P0506 or P0507
DTC Descriptors
DTC P0506
- Idle Speed Low
DTC P0507
- Idle Speed High
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
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
P0506 or P0507
* The engine is idling.
* The engine run time is greater than 2 seconds.
* The evaporative emission (EVAP) purge flow is less than 100 percent.
* The barometric pressure (BARO) is greater than 72 kPa.
* The intake air temperature (IAT) is greater than -20°C (-4°F).
* The engine coolant temperature (ECT) is greater than -10°C (+14°F).
* The ignition voltage is between 11-16 volts.
* The DTCs run when the above conditions are met for 3 seconds.
Conditions for Setting the DTC
P0506
The actual engine speed is less than the desired idle speed by at least 100 RPM for 10 seconds.
P0507
The actual engine speed is more than the desired idle speed by at least 200 RPM for 10 seconds.
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 Electrical Diagrams
Connector End View Reference
* Engine Control Module (ECM) Connector End Views Engine Control Module (ECM) Connector End Views
* Engine Controls Connector End Views Engine Controls Connector End 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
Diagnostic Trouble Code (DTC) Type Definitions Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
* Scan Tool Data List Scan Tool Data List
* Scan Tool Data Definitions Scan Tool Data Definitions
* Scan Tool Output Controls Scan Tool Output Controls
Circuit/System Verification
1. Allow the engine to idle within the conditions for running the DTCs for 1 minute. DTCs P0506 or P0507 should not set.
2. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
Circuit/System Testing
Engine idling, command the engine speed up to 1,400 RPM, down to 600 RPM, up to 1,400 RPM with a scan tool. Verify that the engine speed is within 100 RPM of the commanded speed.
If the engine speed parameter is above the commanded speed, inspect for the following:
* The engine for vacuum leaks
* The throttle valve for the correct operation-A throttle valve that does not close correctly sets this DTC.
* The crankcase ventilation system for the correct operation-Inspect for the following conditions:
- The correct positive crankcase ventilation (PCV) valve is used.
- The routing of the PCV system
- Vacuum leaks in the PCV system
If the engine speed parameter is below the commanded speed, inspect for the following:
* Excess deposits in the throttle body
* A parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition
Repair Instructions
Important: Always perform the Diagnostic Repair Verification Diagnostic Repair Verification after completing the diagnostic procedure.
* Throttle Body Assembly Replacement Removal and Replacement
* Control Module References Control Module References for engine control module replacement, setup, and programming