P0506

DTC P0506

DESCRIPTION
The DTC P0506 Idle Speed Low diagnostic monitors the engine speed. The powertrain control module (PCM) controls the throttle actuator control (TAC) motor in order to regulate the air flow through the throttle body. The amount of air flowing through the throttle body determines the engine speed. If there is a malfunction in the TAC system or other engine control system, DTC P0506 can set.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC.
DTC P0506 Idle Speed Low

CONDITIONS FOR RUNNING THE DTC
- DTCs P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0171, P0172, P0174, P0175, P0222, P0223, P0300-P0306, P0401, P0404, P0507, P1128, P1129, P2100, P2101, P2108, P2122, P2123, P2127, P2128, P2135, P2138, P2176, P2227, P2228, P2229, P2413, and U0107 are not set.
- Battery voltage is at least 10.5 volts.
- Intake air temperature (IAT) is at least 69°C (156°F).
- Engine coolant temperature (ECT) is at least 0°C (32°F).
- The engine has been running at least 15 seconds.
- Engine is running in Closed Loop at idle
- The throttle valve is fully closed
- The vehicle is in PARK with all engine accessories turned OFF
- DTC P0506 runs once per drive cycle when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
- The actual engine speed is 100 RPM less than the desired engine speed.
- The above condition exists for more than 20 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The PCM illuminates the malfunction indicator lamp (MIL) after 2 consecutive ignition cycles in which the diagnostic runs with the fault active.
- The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Freeze Frame buffer.

CONDITIONS FOR CLEARING THE MIL/DTC
- The MIL turns OFF after 3 consecutively passing trips without a fault present.
- A history DTC clears after 40 consecutive warm-up cycles without a fault.
- Perform the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS
Any malfunction that can cause a low idle condition can cause a DTC P0506 to set. For an intermittent malfunction refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-7:

The numbers below refer to the step numbers in the diagnostic table.
1. The Diagnostic System Check-Computers and Control Systems prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.