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Tahoe / Yukon Service Manual

DTC P2006, P20F8, or P295A

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5903615 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 P2006 Intake Manifold Runner Control Valve Stuck Closed DTC P20F8 Intake Manifold Runner Control Valve Control Circuit Performance DTC P295A Cold Start Intake Manifold Runner Control Valve Control Circuit Performance Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Control — Terminal 4 P10C1 P2008 2010 P2006, P20F8, P295A
Control — Terminal 5 P10C1 P2008 2010 P2006, P20F8, P295A

Circuit/System Description

Circuit Description
Control — Terminal 4 The output circuit is switched from ground to 12 V to activate the component. The output is PWM controlled.
Control — Terminal 5 The output circuit is switched from ground to 12 V to activate the component. The output is PWM controlled.
Component Description
K20 Engine Control Module The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.
Component Description
Q22 Intake Manifold Tuning Solenoid Valve The valve is actuated by a 12 V DC motor. A spring is used to keep the valve in the open position. The valve actuator motor moves the valve in the closed direction. The more current flows through the motor, the more the valve closes. Not Activated = Open

Conditions for Running the DTC P2006 DTC P10C1, P10EC, P10ED, P2008, P2010, P2016, P2017, P201B, U064F = Not set DTC P20F8 is set. Intake Manifold Runner Control Valve Command = 0% — Greater than 2 s Frequency the DTC runs = Continuously — After the running conditions are met P20F8 DTC P0071–P0074, P0116–P0119, P10C1, P10EC, P10ED, P2008, P2010, P2016, P2017, P201B, U064F = Not set Ambient Air Temperature = Warmer than −19°C (−2°F) Engine Coolant Temperature Warmer than 30°C (86°F) Engine ≠ Cranking Ignition Voltage = Greater than 11 V Intake Manifold Runner Control Valve Command = Greater than 0% Intake Manifold Runner Control Valve Command = Stable — Greater than 1 s Frequency the DTC runs = Continuously — After the running conditions are met P295A DTC P0071–P0074, P0116–P0119, P10C1, P10EC, P10ED, P2008, P2010, P2016, P2017, P201B, U064F = Not set Ambient Air Temperature = Warmer than −19°C (−2°F) Engine Coolant Temperature Colder than 30°C (86°F) Engine ≠ Cranking Ignition Voltage = Greater than 11 V Intake Manifold Runner Control Valve Command = Greater than 0% Intake Manifold Runner Control Valve Command = Stable — Greater than 1 s Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P2006 Intake Manifold Runner Control Valve Position ≠ Desired Intake Manifold Runner Control Valve Position — Greater than 50% P20F8, P295A Intake Manifold Runner Control Valve Position ≠ Desired Intake Manifold Runner Control Valve Position — Greater than 10% — For greater than 6 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Reduced Engine Power = Active P16 Instrument Cluster = Reduced Engine Power Warning Message = Service Emission System /Service Exhaust Fluid System 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. Engine » Idling
  2. Perform the scan tool control function: Intake Manifold Runner Control Valve » Increase & Decrease Perform the action while monitoring the parameter: Intake Manifold Runner Control Valve Control Circuit High Test Status = Not Run or Okay Intake Manifold Runner Control Valve Control Circuit Low Test Status = Not Run or Okay Intake Manifold Runner Control Valve Control Circuit Open Test Status = Not Run or Okay Intake Manifold Runner Control Valve Control Circuit Shorted Test Status = Not Run or Okay ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  3. Perform the scan tool control function: Intake Manifold Runner Control Valve » Increase & Decrease Perform the action while monitoring the parameter: Intake Manifold Runner Control Valve Position Variance
  4. Verify the scan tool parameter: Intake Manifold Runner Control Valve Position Variance = Less than 10% ⇒ If 10% or greater Refer to: Circuit/System Testing ⇓ If less than 10%
  5. Ignition Off » For greater than 1 min
  6. Ignition » On / Vehicle » In Service Mode
  7. Verify the scan tool parameter: Intake Manifold Runner Control Valve Position Variance = Less than 10% ⇒ If 10% or greater Refer to: Circuit/System Testing ⇓ If less than 10%
  8. 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. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC does not set
  9. All OK. Circuit/System Testing
  10. Ignition/Vehicle » Off
  11. Verify the following conditions do not exist: Blade @ Q22 Intake Manifold Tuning Solenoid Valve Binding or Sticking @ Open/Close — Position Closed @ Engine Off Coking /Debris / Dirty / Visible Damage Open/Close — Without spring pressure ⇒ If a condition exists » Repair or replace as necessary ⇓ If no condition exists
  1. Disconnect the electrical connector: Q22 Intake Manifold Tuning Solenoid Valve
  2. Ignition » On / Vehicle » In Service Mode
  3. Test for 8 to 10 V between the test points: Control circuit terminal 4 @ & Ground Control circuit terminal 5 @ & Ground ⇒ If less than 8 V 5.1. Ignition/Vehicle » Off 5.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 5.3. Test for infinite resistance between the test points: Control circuit terminal 4 @ Component harness & Ground Control circuit terminal 5 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 5.4. Test for infinite resistance between the test points: Control circuit terminal 4 & Control circuit terminal 5 @ Component harness ⇒ If less than infinite resistance » Repair the short between the circuits. ⇓ If infinite resistance 5.5. Test for less than 2 Ω between the test points: Control circuit terminal 4 @ Component harness & The other end of the circuit @ Control module harness Control circuit terminal 5 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇒ If greater than 10 V 5.1. Ignition/Vehicle » Off 5.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 5.3. Ignition » On / Vehicle » In Service Mode 5.4. Test for less than 1 V between the test points: Control circuit terminal 4 @ Component harness & Ground Control circuit terminal 5 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K20 Engine Control Module ⇓ If between 8 and 10 V
  4. Connect a test lamp between the test points: Control circuit terminal 4 & Control circuit terminal 5 @ Component harness
  5. Perform the scan tool control function: Intake Manifold Runner Control Valve » Increase & Decrease
  6. Verify the test lamp turns On and Off. ⇒ If the test lamp does not turn On and Off 8.1. Ignition/Vehicle » Off Remove » Test Lamp 8.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 8.3. Test for less than 2 Ω between the test points: Control circuit terminal 4 @ Component harness & The other end of the circuit @ Control module harness Control circuit terminal 5 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇓ If the test lamp turns On and Off
  7. Test or replace the component: Q22 Intake Manifold Tuning Solenoid Valve Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Intake Manifold Replacement — Q22 Intake Manifold Tuning Solenoid Valve For control module replacement, programming, and setup refer to: Control Module References Additional Procedures
  1. Ignition » On / Vehicle » In Service Mode
  2. Verify that all scan tool Event Data parameters under the following data list displays No: Exhaust Gas Recirculation System Malfunction Warning Event Data ⇒ If not the specified state Operate the vehicle within the Conditions for Running the DTC for the DTC identified by the Event Data parameter displaying Yes. ⇓ If the specified state
  3. All OK.