DTC P0506 or P0507. Chevrolet Epica 2006

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2006 🢒 Epica 🢒 DTC 🢒 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

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.

Conditions for Running the DTC

P0506 or P0507:

•

DTCs P0030, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, P0058, P0102, P0103, P0107, P0108, P0121, P0122, P0123, P0130, P0131, P0132, P0133, P0134, P0136, P0137, P0138, P0139, P0140, P0150, P0151, P0152, P0153, P0154, P0156, P0157, P0158, P0159, P0160, P0221, P0222, P0223, P0230, P0261, P0262, P0263, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0335, P0336, P0337, P0351, P0352, P0353, P0354, P0355, P0356, P0443, P0458, P0459, or P0500 are not set.

•	The engine is idling.

•	The EVAP purge flow is less than 8 kg/h.

•	The throttle is closed for more than 3 seconds.

•	The vehicle speed is 0 km/h (0 mph).

•	The engine coolant temperature (ECT) is between 74-142°C (165-288°F).

•	The ignition voltage is between 10-26 volts.

•	The mass air flow (MAF) is less than 240 mg/stk.

•	The DTCs run when the above conditions are met for 3 seconds.

Conditions for Setting the DTC

P0506

The actual engine speed is less than the desired idle speed by at least 100 RPM for 3 seconds.

P0507

The actual engine speed is more than the desired idle speed by at least 200 RPM for 3 seconds.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

•	Engine Control Module Connector End Views

•	Engine Controls Connector End Views

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

Scan Tool Reference

•	Scan Tool Data List

•	Scan Tool Data Definitions

•	Scan Tool Output Controls

Circuit/System Verification

Allow the engine to idle within the conditions for running the DTCs for 1 minute. DTCs P0506 or P0507 should not set.
If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

If DTC P0506 is set, inspect for the following:

•	Excess deposits in the throttle body

•	A parasitic load on the engine. For example, a transmission condition, a belt driven accessory condition.

If DTC P0507 is set, inspect for the following:

•	The engine for vacuum leaks

•	The throttle valve for the correct operation. A throttle valve that does not close correctly sets this DTC.

•	The crankcase ventilation system for the correct operation. Inspect for the following conditions:

-	The correct positive crankcase ventilation (PCV) valve is used

-	The routing of the PCV system

-	Vacuum leaks in the PCV system

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Throttle Body Assembly Replacement

•	Control Module References for engine control module replacement, setup, and programming