PRE-RELEASE
DTC P0506 or P0507 (LF1, LFW)
| DTC P0506 or P0507 (LF1, LFW) |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0506
Idle Speed Low
DTC P0507
Idle Speed High
| Circuit/System Description |
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 |
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DTCs P0068, P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171, P0172, P0174, P0175, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268. P0270, P0271, P0273, P0274, P0276, P0277, P0300-P0306, P0351-P0356, P0461-P0464, P0496, P0627, P0628, P0629, P0722, P1516, P2066-P2068, are not set.
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The barometric pressure (BARO) is greater than 70 kPa.
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The engine coolant temperature (ECT) is greater than 60°C (140°F).
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The engine run time is greater than 60 s.
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The ignition voltage is between 11-18 V.
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The transmission is not changing gears.
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The torque converter clutch (TCC) is not changing states.
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The intake air temperature (IAT) is warmer than -20°C (-4°F).
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The vehicle speed is less than 3 km/h (2 mph).
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The commanded engine speed is steady within 25 RPM.
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The engine is idling for greater than 5 s.
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The DTCs run when the above conditions are met.
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| Conditions for Setting the DTC |
P0506
The actual engine speed is 94 RPM less than the desired idle speed for 10 s.P0507
The actual engine speed is 188 RPM greater than the desired idle speed for 10 s.| Action Taken When the DTC Sets |
DTCs P0506 and P0507 are Type B DTCs.
| Conditions for Clearing the DTC |
DTCs P0506 and P0507 are Type B DTCs.
| Reference Information |
Schematic Reference
Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
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Ignition ON, observe the DTC information with a scan tool. Verify there are no other DTCs set.
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| 2. |
If a DTC is set, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
for further diagnosis.
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| 3. |
Idle the engine at the normal operating temperature. Compare the Desired Idle Speed to the actual Engine Speed with a scan tool. The actual Engine Speed should not be less than 100 RPM of the Desired Idle Speed or 200 RPM greater than the Desired Idle Speed.
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Let the engine idle within conditions for activating the DTC. DTCs P0506 or P0507 should not set.
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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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| Circuit/System Testing |
Verify none of the following conditions exist:
P0506
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Excess deposits in the Q38 throttle body. Refer to
Throttle Body Inspection and Cleaning
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Restricted exhaust
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Mechanical conditions that limits engine speed
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Parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition.
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If a condition is found, repair as necessary.
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P0507
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Vacuum leaks
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A throttle valve that does not close correctly
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Verify the correct operation of the crankcase ventilation system. Inspect for the following conditions:
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The routing of the positive crankcase ventilation (PCV) system
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Vacuum leaks in the PCV system-Refer to
Crankcase Ventilation System Inspection/Diagnosis
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If a condition is found, repair as necessary.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the repair.
Throttle Body Assembly Replacement (LAU) Throttle Body Assembly Replacement (LF1)
