The turbocharger pressure sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load, and turbocharger boost. The engine control module (ECM) supplies 5 volts to the turbocharger pressure sensor on the 5-volt reference circuit. The ECM provides a ground on the low reference circuit. The turbocharger pressure sensor provides a signal to the ECM on the signal circuit which is relative to the pressure changes in the manifold.

P0234

The actual turbocharger boost pressure is greater than the desired range for greater than 6 seconds.

P0299

The actual turbocharger boost pressure is less than the desired range for greater than 6 seconds.

DTCs P0234 and P0299 are Type B DTCs.

DTCs P0234 and P0299 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Turbocharger System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 24460-01 Cooling System Pressure Tester

1. Ignition ON, compare the scan tool boost pressure sensor parameter to the manifold absolute pressure (MAP) sensor parameter. Both parameters should be within 5 kPa.

⇒	If not within the specified range, refer to DTC P0069 for further diagnosis.

2. Observe the DTC information with a scan tool. Verify that DTC P0045, P0047, or P0048 is not set.

⇒	If any of the DTCs are set, refer to DTC P0045, P0047, or P0048 for further diagnosis.

3. Engine running, increase the engine speed to 2,000 RPM. Command the turbocharger boost solenoid from 0-100 percent and back to 0 percent with a scan tool. Verify the scan tool boost pressure sensor parameter increases and decreases with the scan tool commands.
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.

1. Inspect the intake, and the exhaust systems, for the following:

•	Leaks or restrictions

•	Damaged or missing components

•	Aftermarket components

⇒	If a condition is found, repair as necessary.

2. Ignition OFF, remove the turbocharger boost pressure sensor from the intake manifold.
3. Connect the J 24460-01 to the turbocharger boost pressure port with a suitable adapter. Engine running, observe the scan tool boost pressure parameter. Apply 6 psi to the boost pressure sensor. Verify the scan tool boost pressure sensor parameter responds to the applied pressure.

⇒	If the scan tool boost pressure sensor parameter does not increase with the applied pressure, replace the turbocharger boost sensor.

4. Inspect the turbocharger oil supply lines for a restriction.

⇒	If restricted, repair or replace as necessary.

5. If all other components test normal, test or replace the turbocharger.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.