P0506

DTC P0506 or P0507

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)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 P000A, P0010, P0016, P0068, P0071, P0072, P0073, P0101, P0102, P0103, P0116, P0117, P0118, P0119, P0121, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0261, P0262, P0264, P0265, P0335, P0336, P0340, P0341, P0365, P0366, P0443, P0459, P0496, P0501, P061A, P2088, P2089, P2100, P2101, P2122, P2123, P2127, P2128, P2138, P2227, P2228, P2229, P2301, P2304, P2307, P2310 are not set.
* The engine is operating at idle.
* The engine coolant temperature (ECT) is more than 50°C (122°F).
* The pulse width modulated (PWM) signal for canister purge is less than 90 percent.
* The transmission range is NOT in Reverse.
* The system voltage is more than 10 volts.
* The vehicle speed is equals 0.
* 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 15 seconds.



P0507
* The actual idle speed is approximately 200 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 (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Circuit/System Verification

1. If there are any other DTCs set, diagnose those first.
2. 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.

3. 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

1. 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
* Restricted exhaust
* Mechanical conditions that limit engine speed

2. Inspect for vacuum leaks.