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Tahoe / Yukon Service Manual

DTC P0045, P0048, P006E, P169F, P16FA, or P16FC

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5758384 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 P0045 Turbocharger/Supercharger Boost Control Circuit DTC P0048 Turbocharger/Supercharger Boost Control Circuit High DTC P006E Turbocharger/Supercharger Boost Control High Control Circuit Low DTC P169F Turbocharger/Supercharger Boost Control Circuit Shorted DTC P16FA Turbocharger/Supercharger Boost Control Current Too High DTC P16FC Turbocharger/Supercharger Boost Control Driver Temperature Too High Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Control — Terminal 1 P0046 P0045 P0048 P0046, P2599
Control — Terminal 5 P0046 P0045 P0048 P0046, P2599

Circuit/System Description For an overview of the component/system, refer to: Compressor Air Intake Turbocharger System Description

Circuit Description
Control — Terminal 1 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.
M103 Turbocharger Vane Position Actuator The assembly has several functions: The component is actuated by a bidirectional DC motor. The component M103 contains a contactless inductive position sensor. A fixed transmitter coil excites a movable rotor, which in turn induces a current in a fixed receiver coil. The current varies with the angle of the rotor. Electronics inside the sensor convert the current into digital data which is transmitted via a serial data circuit to the control module K20.

Conditions for Running the DTC Ignition = On or Engine = Running Ignition Voltage = Greater than 11 V Engine ≠ Cranking Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P0045 Control Circuit = Open — For greater than 3 s P0048 Control Circuit = Circuit High Current — Greater than 8 A — For greater than 3 s P006E Control Circuit = System Voltage Low — Less than 6 V — For greater than 3 s P169F, P16FA Control Circuit = Circuit High Current — For greater than 3 s P16FC Control Circuit = Warmer than 170°C (338°F) — For greater than 3 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC Reduced Engine Power = Active Warning Message = Reduced Engine Power Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Diagnostic Aids A weak battery may cause this DTC to set. A high resistance condition on the component circuits may cause the DTC to set. 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. Verify DTC P0689, P0690, P16BC, P16BD, P16BF is not set. ⇒ If any of the DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If none of the DTCs are set
  3. Verify DTC P0045, P0047, P0048, P006E, P169F is not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC does not set
  4. Perform the scan tool control function: Turbocharger Vane Position » Increase & Decrease Verify the scan tool parameter: Turbocharger/Supercharger Boost Control Circuit High Test Status = Not Run or OK Turbocharger/Supercharger Boost Control Circuit Low Test Status = Not Run or OK Turbocharger/Supercharger Boost Control Circuit Open Test Status = Not Run or OK Turbocharger/Supercharger Boost Control Circuit Shorted Test Status = Not Run or OK ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  5. Perform the action while monitoring the parameter: Turbocharger/Supercharger Boost Control Circuit High Test Status = Not Run or OK Turbocharger/Supercharger Boost Control Circuit Low Test Status = Not Run or OK Turbocharger/Supercharger Boost Control Circuit Open Test Status = Not Run or OK Turbocharger/Supercharger Boost Control Circuit Shorted Test Status = Not Run or OK – Wiggle the harness and connector: M103 Turbocharger Vane Position Actuator – Wiggle the harness and connector: K20 Engine Control Module ⇒ If not the specified state Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s) ⇓ If the specified state
  6. 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
  7. All OK. Circuit/System Testing
  8. Ignition/Vehicle » Off
  1. Disconnect the electrical connector: M103 Turbocharger Vane Position Actuator
  2. Ignition » On / Vehicle » In Service Mode
  3. Test for 8 to 10 V between the test points: Control circuit terminal 1 & Ground Control circuit terminal 5 & Ground ⇒ If less than 8 V 4.1. Ignition/Vehicle » Off 4.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 4.3. Test for infinite resistance between the test points: Control circuit terminal 1 @ 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 4.4. Test for infinite resistance between the test points: Control circuit terminal 1 & Control circuit terminal 5 @ Component harness ⇒ If less than infinite resistance » Repair the short between the circuits. ⇓ If infinite resistance 4.5. Test for less than 2 Ω between the test points: Control circuit terminal 1 @ 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 4.1. Ignition/Vehicle » Off 4.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 4.3. Ignition » On / Vehicle » In Service Mode 4.4. Test for less than 1 V between the test points: Control circuit terminal 1 @ 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 1 & Control circuit terminal 5
  5. Perform the scan tool control function: Turbocharger Turbine Inlet Valve Actuator » Increase
  6. Verify the test lamp turns On. ⇒ If the test lamp does not turn On 7.1. Ignition/Vehicle » Off & Remove » Test lamp 7.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 7.3. Test for less than 2 Ω between the test points: Control circuit terminal 1 @ 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
  7. Test or replace the component: M103 Turbocharger Vane Position Actuator Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Variable Geometry Turbocharger Actuator Replacement — M103 Turbocharger Vane Position Actuator For control module replacement, programming, and setup refer to: Control Module References Additional Procedures Barometric Pressure Sensor Reset — Perform only when the following component/system is replaced or serviced: K20 Engine Control Module Turbocharger/Supercharger Boost Control Initial Position Learn — Perform only when the following component/system is replaced or serviced: – K20 Engine Control Module — Programmed / Replaced – Turbocharger — Cleaned / Replaced