VIN L

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) provide an overview of each diagnostic category.

DTC Descriptors
DTC P0506
- Idle Speed Low

DTC P0507
- Idle Speed High

Circuit/System Description

The engine control module (ECM) adjusts the fuel delivery in order to control crankshaft speed at idle. The ECM monitors the engine speed and will detect an out of range idle speed for the amount of fuel that is delivered.

Conditions for Running the DTC

* The engine is operating for greater than 180 s.
* The engine speed is greater than 300 RPM.
* The engine coolant temperature (ECT) is between -7 to +123°C (19-253°F).
* The vehicle speed is less than 3 km/h (2 mph).
* DTC P0506 and P0507 run continuously when the above conditions are met.

Conditions for Setting the DTC

P0506

The ECM detects the actual idle speed is below a predetermined speed for greater than 20 s.

P0507

The ECM detects the actual idle speed is above a predetermined speed for greater than 20 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 Views

Component Connector End Views (Connector End Views By Name)
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 (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify there are no other DTCs set.

• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.

2. Engine idling at the normal operating temperature. Compare the scan tool Desired Idle Speed parameter to the Engine Speed parameter. Both parameters should be within 200 RPM.
3. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Verify none of the following conditions exist:

P0506
* A crankcase overfill can cause oil to be forced through the positive crankcase ventilation (PCV) system.
* 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
* An outside source that has allowed oil or fuel to enter the air induction system.
* Fuel in engine oil being drawn into the engine.
* An aftermarket performance kit using an external fuel source.

• If a condition is found, repair as necessary.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.