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Tahoe / Yukon Service Manual

DTC P0506 or P0507

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5152757 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P0506 Idle Speed Low DTC P0507 Idle Speed High Circuit/System Description For an overview of the component/system, refer to: Fuel System Description Conditions for Running the DTC DTC P0096–P099, P00E9, P00EA–P00EC, P0101, P0102, P0103, P0106–P0108, P0111– P0114, P0116–P0119, P0128, P0171, P0172, P0300, P0301–P0306, P0400, P0401, P0402, P0403, P0405, P0406, P042E, P042F, P0462, P0463, P0489, P0490, P049D, P062D, P0502, P0503, P0722, P0723, P0806, P0807, P0808, P140B, P140C, P2227–P2230, P2271, P227B– P227E = Not set Barometric Pressure = Greater than 70 kPa (10 PSI) { If equipped } Clutch Pedal = Not Pressed { If equipped } Clutch Pedal = Engaged Less than 12% { If equipped } Clutch Pedal = Engaged Greater than 75% Engine = Running — For greater than 1 min Engine = Idling — For greater than 5 s Engine Coolant Temperature = Greater than 60°C (140°F) Engine speed varies less than +/-25 RPM Ignition and Start Signal = 11 to 32 V Intake Air Temperature Sensor = Greater than −20°C (−4°F) Scan Tool Control Function = Inactive Torque Converter Clutch = Inactive Transmission = Not Shifting Vehicle Speed = Less than 1.6 km/h (1 MPH) Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 10 s Conditions for Setting the DTC P0506 Engine Speed = 75 RPM Less than desired — For greater than 10 s P0507 Engine Speed = 150 RPM Greater than desired — For greater than 10 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List 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 Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify no other DTCs are set. ⇒ If any other DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If no other DTCs are set
  3. Engine » Idling — At normal operating temperature.
  4. Verify the scan tool parameter: Engine Speed = −100 to +200 RPM of the Desired Idle Speed ⇓ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set. ⇓ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC does not set
  7. All OK. Circuit/System Testing P0506
  8. Verify the following conditions do not exist: Exhaust System — Restricted Mechanical Condition — Engine Speed = Limited Engine — Parasitic Load ⇒ If a condition exists Repair as necessary ⇓ If no conditions exist
  9. All OK. P0507
  10. Verify the following conditions do not exist: Fuel Injector — Leaking Engine Oil — Contamination / Fuel Aftermarket equipment/accessories: Fuel System ⇒ If a condition exists Repair as necessary ⇓ If no conditions exist
  11. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification