FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Chevy Truck >> 2010 >> Express 3500 V8-6.6L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0048 >> VIN 6

VIN 6




DTC P0047 or P0048

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 Descriptors
DTC P0047
- Turbocharger Boost Control Solenoid Control Circuit Low Voltage

DTC P0048
- Turbocharger Boost Control Solenoid Control Circuit High Voltage

Diagnostic Fault Information





Circuit/System Description

The positions of the turbocharger vanes are controlled by the engine control module (ECM). The ECM utilizes a turbocharger vane control solenoid to control the turbocharger vanes and a turbocharger vane position sensor to verify the vanes position. The ECM will vary the boost dependant upon the load requirements of the engine. The vane control solenoid has a high control circuit and a low control circuit. The ECM uses a pulse width modulation on the low control circuit to control the solenoid.

Conditions for Running the DTC

* The engine run time is greater than 60 seconds.
* DTCs P0047 and P0048 run continuously when the above condition is met.

Conditions for Setting the DTC

* The ECM detects that the commanded state of the driver and the actual state of the control circuits do NOT match.
* The above condition exists for equal to or greater than 4 seconds.

Action Taken When the DTC Sets

DTCs P0047 and P0048 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0047 and P0048 are Type B DTCs.

Diagnostic Aids

If there is a loss of ignition voltage to the ECM terminal X1-76 this DTC may set. Verify this circuit is not shorted to ground or open. Verify the supply fuse for this circuit is not open.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

* Turbocharger System Description (Description and Operation)
* Turbocharger Learn (Testing and Inspection)

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 (Programming and Relearning) for scan tool information
Special Tools

J 34730-405 Injector Test Lamp

Circuit/System Verification

1. Verify that DTCs P0652, P0653, P0698, P0699, P2564, or P2565 are not set.

• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

2. Engine running, increase the engine speed to 1,500 RPM and maintain. Command the TC Vane Pos. Ctrl. Solenoid ON and OFF with a scan tool while observing the Vane Position Sensor parameter. The TC Vane Position Sensor parameter should increase to 95-97 percent and decrease to near 0 percent when changing between the commanded states.
3. Engine running, observe the TC Vane Position Sensor and the Desired TC Vane Position parameters with a scan tool. Slowly increase the engine speed from idle to 2,500 RPM, and slowly return the engine to idle speed. The TC Vane Position Sensor parameter should remain near or equal to the Desired TC Vane Position parameter throughout the engine speed range.
4. Engine running, observe the TC Vane Position Sensor and the Desired TC Vane Position parameters while increasing the TC vane position in 5 percent increments from 0-100 percent with a scan tool. The parameters should remain within 2 percent of each other during the entire range.
5. Operate the vehicle within the Conditions for Running the DTC to verify that 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. Ignition OFF, disconnect the harness connector at the TC vane control solenoid.
2. Ignition ON, verify that a test lamp illuminates between the TC high control circuit terminal A and ground.

• If the test lamp does not illuminate, test the high control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

Note: When the engine coolant temperature is less than 70°C (158°F), the test lamp will change brightness when commanded with a scan tool. When the ECM is attempting a TC Learn, the test lamp will flash ON and OFF without commands from a scan tool.

3. Connect the J 34730-405 between the high control circuit terminal A and the low control circuit terminal B.
4. Engine running, engine coolant temperature (ECT) sensor 1 must be less than 70°C (158°F). Command the TC Vane Pos. Ctrl. Solenoid ON and OFF with a scan tool. The test lamp should illuminate and change from bright to dim when changing between the commanded states.

• If the test lamp does not illuminate, test the low control circuit terminal B for an open/high resistance or a short to voltage. If the circuits test normal, replace the ECM.
• If the test lamp remains illuminated, test the low control circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.

5. Ignition OFF, test for a resistance between 2-7 ohm across the terminals of the TC vane control solenoid.

• If the resistance is not within the specified range, replace the TC vane position solenoid.

6. Test for infinite resistance between each terminal and the TC vane control solenoid housing.

• If less than infinite resistance, replace the TC vane control solenoid.

7. If all circuits test normal, replace the TC vane control solenoid.

Repair Instructions

* Turbocharger Control Solenoid Valve Replacement (Turbocharger Control Solenoid Valve Replacement)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming

Repair Verification

1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Turn OFF the ignition for 90 seconds.
5. Duplicate the Conditions for Running the DTC and use the freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic procedure.
6. If any service has been performed on the turbocharger or on the turbocharger components, a turbocharger relearn must be performed. Failure to perform the turbocharger learn procedure may cause this DTC to set. Refer to Turbocharger Learn (Testing and Inspection).

pro multis Credits:Operation CHARM About Operation CHARM