P0507
DTC P0506 or P0507 (LUW, LWE)
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 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, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0351, P0352, P0353, P0354, P0461, P0462, P0463, P0496, P0502, P0503, P0606, P0697, P06A3, P0806, P0807, P0808, P16F3, P2101, P2122, P2123, P2127, P2128, P2135, P2138 or P2771 are not set.
* The barometric pressure (BARO) is greater than 70 kPa.
* The engine runtime is greater than 60 s.
* The engine is idling for greater than 10 s.
* The torque converter clutch (TCC) is not changing states.
* The transmission is not changing gears.
* The intake air temperature (IAT) is greater than -20°C (-4°F).
* The engine coolant temperature (ECT) is between 60-120°C (140-248°F).
* The ignition voltage is between 11-32 V.
* The vehicle speed is less than 3.2 km/h (2 mph).
* The commanded engine speed is steady within 25 RPM.
* The DTCs run continuously when the above conditions are met for greater than 10 s.
Conditions for Setting the DTC
P0506
The ECM detects that the actual idle speed is approximately 91 RPM lower than the desired idle speed.
P0507
The ECM detects that the actual idle speed is approximately 182 RPM higher than desired idle speed.
Action Taken When the DTC Sets
DTC P0506 and P0507 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0506 and P0507 are Type B DTCs.
Diagnostic Aids
* A stalling condition can cause DTC P0506 to set.
* An intermittent vehicle speed sensor (VSS) signal can cause DTC P0507 to set.
* An intermittent clutch pedal position sensor signal, if equipped, can cause DTC P0506 to set.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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.
Note: The engine must run for greater than 60 s, then idle at a steady state for an additional 10 s before comparing the actual and desired engine speed parameters.
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 none of the following conditions exist:
P0506
* Excess deposits in the Q38 throttle body. Refer to Throttle Body Inspection and Cleaning Procedures.
* Restricted exhaust
* Mechanical conditions that limits engine speed
* Parasitic load on the engine-For example, a transmission condition, 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 following conditions:
- 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 Verification
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Throttle Body Inspection and Cleaning Procedures
* Throttle Body Assembly Replacement Removal and Replacement