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Home >> Chevy Truck >> 2013 >> Express 4500 V8-6.6L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P2599

P2599




DTC P2598 or P2599

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptor

DTC P2598

-
Turbocharger Boost Control Position Performance - Low Position

DTC P2599

-
Turbocharger Boost Control Position Performance - High Position

Circuit/System Description

The position of the turbocharger vanes is controlled by the Engine Control Module (ECM). The ECM utilizes a turbocharger vane control solenoid valve to control the turbocharger vanes, and a turbocharger vane position sensor to verify the position of the vanes. The ECM will vary the boost dependent upon the load requirements of the engine. The turbocharger vane position sensor provides the ECM with a signal voltage relative to the vane position.

Conditions for Running the DTC

* DTC P003A, P006E, P006F, P0045, P0047, P0048, P2564, or P2565 is not set.

* The engine coolant temperature is between 70-123°C (158-253°F).

* The engine is running for greater than 30-210 s, depending on the engine coolant temperature at start.

* The turbocharger vane position learn procedure is not active and has completed and passed since the last clearing of fault code memory.

* The ambient air temperature is greater than -15°C (5°F).

* DTC P2598 and P2599 run continuously whenever the above conditions are met.

Conditions for Setting the DTC

P2598

The ECM detects that the difference between actual vane position and desired vane position is greater than 15 % for greater than 10 s.

P2599

The ECM detects that the difference between actual vane position and desired vane position is less than 15% for greater than 10 s.

Action Taken When the DTC Sets

* DTC P2598 and P2599 are Type B DTCs.

* Diesel Particulate Filter (DPF) Regeneration is Inhibited.

Conditions for Clearing the MIL/DTC

DTC P2598 and P2599 are Type B DTCs.

Diagnostic Aids

A restricted oil supply feed to the turbocharger may cause this DTC to set.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Turbocharger System Description Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, observe the scan tool DTC information. Verify DTC P06D2, P168C, P168D or P2263, is not set.

• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

2. Engine running, observe the scan tool TC Vane Position Sensor and the Desired TC Vane Position parameters. Command the TC vane position sensor in 5 % increments from 0-100 %. The parameters should remain within 2 % throughout the commanded range.

3. Engine running, observe the scan tool TC Vane Position Sensor and the Desired TC Vane Position parameters while slowly increasing the engine speed to 2,500 RPM and slowly returning to idle speed. The parameters should remain near or equal throughout the engine speed range.

4. 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.

Circuit/System Testing

1. Inspect the turbocharger for debris, sticking vanes, or damage. Refer to Turbocharger Cleaning and Inspection Turbocharger Cleaning and Inspection.

• If a condition is found, clean or replace the turbocharger as necessary.

2. Inspect the Q41 turbocharger vane position control solenoid valve and B112 turbocharger Vane Position Sensor for damage or sticking.

• If a condition is found, test or replace the affected component as necessary.

Component Testing

Turbocharger Vane Position Control Solenoid Valve

1. Ignition OFF, disconnect the harness connector at the Q41 turbocharger vane position control solenoid valve.

2. Measure the resistance across the Q41 turbocharger vane position control solenoid valve terminals. The resistance should be between 3-7 ohms.

• If greater than the specified range, replace the Q41 turbocharger vane position control solenoid valve.

3. Test for infinite resistance between each Q41 turbocharger vane position control solenoid valve terminal and the solenoid valve housing.

• If less than the specified range, replace the Q41 turbocharger vane position control solenoid valve.

4. Ignition OFF, remove the Q41 turbocharger vane position control solenoid valve.

5. Connect the Q41 turbocharger vane position control solenoid valve harness connector.

6. Ignition ON, command the TC Vane Pos. Cntrl. Solenoid ON. Depress and hold the CAM follower slightly at the tip of the TC solenoid valve while observing the slot closest to the CAM follower for the spool valve to move to the open position.

• If the spool valve did not move to the open position, replace the Q41 turbocharger vane position control solenoid valve.

Turbocharger Vane Position Sensor

1. Remove the B112 turbocharger vane position sensor.

2. Connect the B112 turbocharger vane position sensor harness connector.

Note:
It is normal for the TC Vane Position Sensor voltage to quickly return to approximately 4.9 V as the plunger reaches its fully depressed position.

3. Ignition ON, observe the scan tool TC Vane Position Sensor voltage while slowly depressing the plunger at the end of the B112 turbocharger vane position sensor. The voltage should decrease smoothly from approximately 4.9-0.2 V.

• If the TC Vane Position Sensor parameter drops out or spikes, replace the B112 turbocharger vane position sensor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Turbocharger Replacement Turbocharger Replacement

* Turbocharger Control Solenoid Valve Replacement Turbocharger Control Solenoid Valve Replacement

* Turbocharger Vane Position Sensor Replacement Turbocharger Vane Position Sensor Replacement

* If any service has been performed on the turbocharger or on the turbocharger components, a turbocharger relearn must be performed. Refer to Turbocharger Learn Testing and Inspection

* Control Module References Control Module References for ECM replacement, setup, and programming

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