DTC P0506, P0507, or P050A (Without LF1, LFW)
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DTC P0506, P0507, or P050A (Without LF1, LFW)
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DTC P0506
Idle Speed Low
DTC P0507
Idle Speed High
DTC P050A
Cold Start Idle Air Control System Performance
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Circuit/System Description
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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. If the ECM detects the actual idle speed is not within a predetermined range of the desired idle speed, this DTC sets.
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Conditions for Running the DTC
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DTC P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, P0338, P2100-P2103 is not set.
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The engine load is less than 40 percent, for P0506.
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The engine coolant temperature (ECT) is warmer than 65°C (149°F), for P0506.
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The engine coolant temperature (ECT) is warmer than 69°C (156°F), for P0507.
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The intake air temperature (IAT) is warmer than -11°C (+13°F), for P0506.
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The engine speed is at idle.
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The engine is operating for greater than 100 s.
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The EVAP intrusive leak test is not enabled.
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The vehicle speed is 0 km/h (0 MPH).
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The cold start idle speed control is not active.
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The evaporative emission (EVAP) canister purge valve command less than 40 percent.
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A vehicle speed was detected prior to the diagnostic running.
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DTC P0506 and P0507 run continuously once the above conditions are met for greater than 10 s.
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Conditions for Setting the DTC
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P0506
The actual engine speed is less than the desired idle speed by at least 100 RPM for greater than 1 s or for a cumulative time of 4 s.
P0507
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The actual engine speed is greater than the desired idle speed by at least 200 RPM for greater than 1 s or for a cumulative time of 4 s.
OR
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The ECM detects 3 fuel cut-offs due to an engine over speed condition while the vehicle speed is zero.
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P050A
The actual engine speed is 100 RPM less or 200 RPM greater than the desired idle speed, for greater than 1 s or a cumulative of 4 s, during a cold start.
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Action Taken When the DTC Sets
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DTCs P0506, P0507, and P050A are Type B DTCs.
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Conditions for Clearing the DTC
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DTCs P0506, P0507, and P050A are Type B DTCs.
Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore.
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Observe the DTC information with a scan tool.
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2.
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If there are any throttle actuator control (TAC), throttle position (TP) sensor, accelerator pedal position (APP) sensor, or fuel rail pressure (FRP) regulator DTCs set, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
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Run the engine under the conditions for activating the diagnostic trouble codes for 1 minute. Diagnostic trouble codes P0506, P0507 or P050A must not be activated.
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4.
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Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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Engine operating, command the engine speed up to 1,400 RPM, down to 600 RPM, up to 1,400 RPM, and then exit using the scan tool. The engine speed should steadily increase and decrease as commanded.
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The throttle valve for the correct operation-A throttle valve that does not close correctly sets this DTC.
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Restricted air intake system
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The throttle body for damage and/or tampering
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Incorrect or malfunctioning PCV system
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Excess deposits in the throttle body
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A parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition
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Repair the condition as necessary.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
