DTC P0046, P2599, or P2958

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5877101 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 P0046 Turbocharger Boost Control Position Performance DTC P2599 Turbocharger Vane Position Performance - High Position DTC P2958 Cold Start Turbocharger/Supercharger Boost Control Position Performance Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performanc
Control — Terminal 1	P169E, P169F	P0045	P0048	P0046, P2598, P2599
Control — Terminal 2	P169E, P169F	P0045	P0048	P0046, P2598, 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

Component	Description
	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 P0046, P2958 DTC P003A, P0045-P0048, P0071–P0074, P0116–P0119, P0128, P111E, P169E, P169F, P16FA, P16FC, P2564, P2565 = Not set Engine ≠ Cranking Engine Coolant Temperature = Warmer than 0°C (32°F) Ignition and Start Signal = Greater than 11 V Turbocharger Vane Position Command = Steady State For greater than 1 s Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 1 s P2599 DTC P003A, P0045, P0047, P0048, P169E, P169F, P16FA, P16FC, P2564, P2565, U0656 = Not set DTC P0046 is set. Ignition and Start Signal = Greater than 11 V Ignition and Start Switch Signal = Off Greater than 2 s Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 1 s Conditions for Setting the DTC P0046 & P2958 Turbocharger/Supercharger Boost Control Position Sensor & Desired Turbocharger/Supercharger Boost Control Position = Not within 10% of each other — For greater than 8 s P2599 Turbocharger/Supercharger Boost Control Position Sensor & Desired Turbocharger/Supercharger Boost Control Position = Not within 25% of each other — More closed than desired & DTC P0046 is set. Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A — Additional actions taken: Reduced Engine Power = Active Warning Message = 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 A 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 DTC P003A, P0045, P0047, P0048, P100B, PP16FA, P16FC, P16B0, P16B1, P16B2, P169E, P169F, P2564, P2565, U0656 is not set. ⇒ If the DTC is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If the DTC is not set
3. Verify the scan tool parameter: Turbocharger/Supercharger Boost Control Position Sensor = 60–80% ⇒ If not in the specified range Refer to: Circuit/System Testing ⇓ If in the specified range
4. Clear the DTCs.
5. Engine » Idling
6. Verify the scan tool parameter: Turbocharger/Supercharger Boost Control Position Sensor = 70–100% ⇒ If not in the specified range Refer to: Circuit/System Testing ⇓ If in the specified range
7. Perform the scan tool control function: Turbocharger/Supercharger Boost Control Position » From 20 to 80% and back to 20%. Verify the difference between the following parameters is less than 16%: Desired Turbocharger/Supercharger Boost Control Position Turbocharger/Supercharger Boost Control Position Sensor ⇒ If the difference is greater than 15% Refer to: Circuit/System Testing ⇓ If the difference is less than 16%
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 is not set
9. All OK. Circuit/System Testing
10. Ignition/Vehicle » Off
11. Verify a condition does not exist with the component: Turbocharger @ M103 Turbocharger Vane Position Actuator Mechanically stuck control rod. — Visible Damage / Incorrect connection Blade — Mechanically stuck /Binding or Sticking @ Closed /Open Mechanically damaged — Debris /Visible Damage Refer to: Compressor Air Intake Turbocharger System Description ⇒ If a condition exists Replace the component: Turbocharger ⇓ If no conditions exist
12. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Variable Geometry Turbocharger Actuator Replacement — M103 Turbocharger Vane Position Actuator Compressor Air Intake Turbocharger Replacement For control module replacement, programming, and setup refer to: Control Module References Additional Procedures

Note

The DTC causing the Driver Information Center message/speed limitation to set must run and pass before the message/speed limitation will clear. This may require driving the vehicle. Additional Procedures

Note

The DTC causing the Driver Information Center message/speed limitation to set must run and pass before the message/speed limitation will clear. This may require driving the vehicle.

1. Ignition » On / Vehicle » In Service Mode
2. Turbocharger/Supercharger Boost Control Initial Position Learn — Perform only when the following component/system is replaced or serviced: Turbocharger
3. 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
4. All OK.