P0507

DTC P0506, P0507, or P050A (Without LF1, LFW)

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

DTC P050A
- Cold Start Idle Air Control System Performance

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. If the ECM detects the actual idle speed is not within a predetermined range of the desired idle speed, this DTC sets.

Conditions for Running the DTC

P0506 and P0507
* DTC P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0221, P0222, P0223, P0442, P0443, P0446, P0455, P0458, P0459, P0496, or P0700 is not set.
* The engine is operating for greater than 4 seconds.
* The engine load is between 32-75 percent, for P0506 or manual transmission only.
* The engine coolant temperature (ECT) is warmer than -11°C (+13°F).
* The intake air temperature (IAT) is warmer than -11°C (+13°F).
* The vehicle speed is 0 km/h (0 mph) and accelerator pedal position (APP) input is at 0 percent.
* The EVAP intrusive leak test is not enabled.
* The cold start idle speed control is not active.
* The evaporative emission (EVAP) canister purge valve command less than 40 percent.
* A vehicle speed was detected prior to the diagnostic running.
* DTC P0506 and P0507 run continuously once the above conditions are met for greater than 10 seconds.

P050A
* DTC P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0221, P0222, P0223, P0442, P0443, P0446, P0455, P0458, P0459, P0496, or P0700 is not set.
* The engine load is between 70-90 percent, for under speed or manual transmission only.
* The vehicle speed is 0 km/h (0 mph) and accelerator pedal position (APP) input is at 0 percent.
* The engine coolant temperature (ECT) is colder than 65°C (149°F).
* The catalyst cold start heating strategy is active.
* DTC P050A runs once an ignition cycle when the conditions above have been met for 7 seconds.

Conditions for Setting the DTC

P0506

The actual engine speed is less than the desired idle speed by at least 100 RPM for greater than 4 seconds.

P0507
* The actual engine speed is greater than the desired idle speed by at least 200 RPM for greater than 4 seconds.
OR
* The ECM detects 3 fuel cut-offs due to an engine over speed condition while the vehicle speed is zero.

P050A

The actual engine speed is 100 RPM less or 200 RPM greater than the desired idle speed during a cold start, for greater than 4 seconds.

Action Taken When the DTC Sets

DTCs P0506, P0507, and P050A are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0506, P0507, and P050A are Type B DTCs.

Diagnostic Aids

Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

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. Observe the DTC information with a scan tool.

• If there are any throttle actuator control (TAC), throttle position (TP) sensor, accelerator pedal position (APP) sensor, or fuel rail pressure (FRP) regulator DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

2. Operate the engine within the conditions for running the DTCs for 1 minute. DTC P0506, P0507, or P050A should not set.
3. Operate the vehicle within the Conditions for Running the DTC to verify 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

Engine operating, command the engine speed up to 1,400 RPM, down to 600 RPM, up to 1,400 RPM, and then exit using the scan tool. The engine speed should steadily increase and decrease as commanded.

If the idle does not increase or decrease steadily, verify that none of the following conditions is present:

* Vacuum leaks
* The throttle valve for the correct operation-A throttle valve that does not close correctly sets this DTC.
* Restricted air intake system
* The throttle body for damage and/or tampering
* Incorrect or malfunctioning PCV system
* Excess deposits in the throttle body
* A parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition

• Repair the condition as necessary.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.