Chevrolet Trax: DTC P0506 OR P0507

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• 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 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, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0171, P0172, P0201-P0204, P0220, P0222, P0223, P0300-P0304, P0351-P0354, P0461- P0463, P0496, P0606, P0722, P0723, P1516, P2066-P2068, P2101, P2135 are not set.
• The engine is operating for at least 60 s.
• The barometric pressure (BARO) is greater than 70 kPa (11 psi).
• The engine coolant temperature (ECT) is greater than 60ºC (140ºF).
• The system voltage is between 11-32 V.
• The transmission is not changing gears.
• The torque converter clutch (TCC) is not changing states.
• The intake air temperature (IAT) is warmer than -20ºC (-4ºF).
• The vehicle speed is less than 3 km/h (2 mph).
• The commanded engine speed is steady within 25 RPM.
• The engine is idling for greater than 5 s.
• A scan tool output control is not active.
• DTC P0506 and P0507 run continuously when the above conditions are met for greater than 10 s.

Conditions for Setting the DTC

P0506

The actual idle speed is approximately 91 RPM lower than the desired idle speed.

P0507

The actual idle speed is approximately 182 RPM greater than the desired idle speed.

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.

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 (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Throttle Actuator Control (TAC) System Description

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify no other DTCs set.

• If any other DTC is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

• If no other DTC is 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 .

• 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

P0506

1. Verify the conditions listed below do not exist.

• 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.

• If a condition is not found

2. All OK.

P0507

1. Verify the conditions listed below do not exist.

• Vacuum leaks
• A throttle valve that does not close correctly
• Verify the correct operation of the crankcase ventilation system. Inspect for the conditions listed below:

• Improper routing of the positive crankcase ventilation (PCV) system
• Vacuum leaks in the PCV system.
• If a condition is found

Repair as necessary.

• If a condition is not found

2. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Throttle Body Assembly Replacement

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