P0506

CIRCUIT DESCRIPTION
The idle speed is controlled by the Engine Control Module (ECM). The ECM will command the throttle valve motor to open or close the throttle valve in order to maintain the desired idle speed.

CONDITIONS FOR RUNNING THE DTC
^ One or more of the following DTCs are not set: P0110, P0115, P0116, P0411, P0440, P0442, P0443, P0446, P0455, P0500, P1120, P1220.
^ The Intake Air Temperature (IAT) is more than 0°C (32°F).
^ The Engine Coolant Temperature (ECT) is more than 80°C (176°F).
^ The engine load is less than 2 percent.
^ The Evaporative Emissions (EVAP) diagnostic is not running.
^ The EVAP is not purging.
^ Vehicle speed is 0 km/h (0 mph)
^ Secondary air diagnostic is not running.

CONDITIONS FOR SETTING THE DTC
The actual engine RPM is lower than the desired idle speed by at least 100 RPM.

ACTION TAKEN WHEN THE DTC SETS
The ECM illuminates the Malfunction Indicator Lamp (MIL) and records the operating conditions in the Freeze Frame on the second consecutive drive trip that the diagnostic runs and fails.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The ECM turns OFF the MIL after three consecutive drive trips that the diagnostic runs and passes.
^ A History DTC clears after forty consecutive warm-up cycles in which no failures are reported by this diagnostic or any other emission related diagnostic.
^ The scan tool clears the MIL/DTC.

DIAGNOSTIC AIDS
For an intermittent, refer to Symptoms. Symptom Related Diagnostic Procedures

TEST DESCRIPTION

Diagnostic Chart:

The numbers below refer to the step numbers on the diagnostic table.
2. If any of the listed DTCs are present correct the condition before returning to this table.
3. This test determines whether or not the engine can achieve the commanded RPM, and if not, whether the RPM is too high or too low.