DTC P0506 or P0507 LTD without Turbocharger
Diagnostic Instructions
DTC Descriptors
DTC P0506: Idle Speed Low
DTC P0507: Idle Speed High
Circuit/System Description
The throttle actuator control (TAC) motor is controlled by the engine control module (ECM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the ECM commands
the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the ECM commands the throttle plate open allowing more air to pass the throttle plate.
Conditions for Running the DTC
| • | DTCs P0068, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0300, P0336, P0442, P0446, P0452, P0453, P0641, P0651, P1516, P2101, P2135, P2176 are not set. |
| • | The engine is operating for at least 2 seconds. |
| • | The engine coolant temperature (ECT) is more than -40°C (-40°F). |
| • | The intake air temperature (IAT) is more than -40°C (-40°F). |
| • | The barometric pressure (BARO) is more than 65 kPa. |
| • | The system voltage is between 9-18V. |
| • | The vehicle speed is less than 4.8 km/h (3 mph). |
| • | DTC P0506 and P0507 run continuously when the above conditions are met. |
Conditions for Setting the DTC
P0506
| • | The actual idle speed is approximately 150 RPM lower than the desired idle speed. |
| • | The above condition is present for 15 seconds. |
P0507
| • | The actual idle speed is approximately 100 RPM greater than the desired idle speed. |
| • | The above condition is present for 15 seconds. |
Action Taken When the DTC Sets
DTCs P0506 and P0507 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0506 and P0507 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- If there are any other DTCs set, diagnose those first.
- Using a scan tool compare the desired engine idle speed to the actual engine idle speed.
| • | Actual engine idle speed should be no greater than 150 RPM below desired. |
| • | Actual engine idle speed should be no greater than 100 RPM above desired. |
- 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.
Circuit/System Testing
- Inspect for any condition that can reduce idle speed by increasing engine load.
| • | Incorrect torque converter clutch (TCC) operation |
| • | Accessories that require additional torque to operate |
| • | Excessive deposits in the throttle body |
| • | Mechanical conditions that limit engine speed |
- Inspect for the following conditions:
| • | A faulty positive crankcase ventilation system |
Repair Instructions
Throttle Body Assembly Replacement
DTC P0506 or P0507 LDK with Turbocharger
Diagnostic Instructions
DTC Descriptors
DTC P0506: Idle Speed Low
DTC P0507: Idle Speed High
Circuit/System Description
The throttle actuator control (TAC) motor is controlled by the engine control module (ECM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the ECM commands
the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the ECM commands the throttle plate open allowing more air to pass the throttle plate.
Conditions for Running the DTC
| • | DTCs P0096, P0097, P0098, P0099, P0117, P0118, P0121, P0122, P0123, P0300, P0336, P0446, P0443, P0455, P0458, P0459, P0496, P2101, P2176 are not set. |
| • | The engine load is less than 40 percent manual transmission only. |
| • | Catalyst heating after a cold start is not active. |
| • | Intake air temperature greater than -10°C (+14°F). |
| • | The barometric pressure (BARO) is more than 65 kPa. |
| • | DTC P0506 and P0507 run continuously when the above conditions are met. |
Conditions for Setting the DTC
P0506
| • | The actual idle speed is approximately 100 RPM lower than the desired idle speed. |
| • | The above condition is present for 10 seconds. |
P0507
| • | The actual idle speed is approximately 200 RPM greater than the desired idle speed. |
| • | The above condition is present 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
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| • | Using a scan tool compare the desired engine idle speed to the actual engine idle speed. |
| • | Actual engine idle speed should be no greater than 100 RPM below desired. |
| • | Actual engine idle speed should be no greater than 200 RPM above desired. |
| • | 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. |
Circuit/System Testing
- If there are any other DTCs set, diagnose those first.
- Inspect for any condition that can reduce idle speed by increasing engine load.
| • | Incorrect torque converter clutch (TCC) operation |
| • | Accessories that require additional torque to operate |
| • | Excessive deposits in the throttle body |
| • | Mechanical conditions that limit engine speed |
- Inspect for the following conditions:
| • | A faulty positive crankcase ventilation System |
Repair Verification
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
