For 1990-2009 cars

### Diagnostic Instructions

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

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

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC P2263 5A: Turbocharger Boost System Performance Not Plausible
DTC P2263 5B: Turbocharger Boost System Performance Malfunction
DTC P2263 61: Turbocharger Boost System Performance Stuck

### Circuit/System Description

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 V 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.

### Conditions for Running the DTC

• | The engine is running.

• | The DTCs run continuously when the above conditions are met.

### Conditions for Setting the DTC

The actual turbocharger boost pressure is out of the desired range for greater than 200 s.

### Action Taken When the DTC Sets

DTC P2263 is a Type C DTC.

### Conditions for Clearing the DTC

DTC P2263 is a Type C DTC.

### Reference Information

#### Schematic Reference

LINK 164816

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

LINK 1846576 Turbocharger System Description

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

LINK 1803340

#### Scan Tool Reference

Control Module References for scan tool information

#### Special Tools

EN-23738-A Mityvac

For equivalent regional tools, refer to Special Tools.

### Circuit/System Verification

1. Ignition ON, compare the scan tool boost pressure sensor parameter to the barometric pressure sensor parameter. Both parameters should be within 5 kPa (0.73 PSI).

⇒ | If not within the specified range, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

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

⇒ | If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

3. Engine running, increase the engine speed to 2 000 RPM. Command the turbocharger boost solenoid from ON and OFF 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.

### Circuit/System Testing

1. Inspect the fuel tank for the right fuel content
2. 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.

3. Disconnect the vacuum source from the Q41 Turbocharger Vane Position Control Solenoid Valve
4. Connect the EN-23738-A Mityvac to the Q41 Turbocharger Vane Position Control Solenoid Valve vacuum supply hose. Engine running, verify the vacuum is greater than -50 kPa (-7.25 PSI).

⇒ | If less than the specified range, inspect the vacuum supply hose and filter for a leak or restriction. If the supply hose is normal, replace the vacuum pump.

5. Connect the vacuum source to the Q41 Turbocharger Vane Position Control Solenoid Valve. Connect the EN-23738-A Mityvac to the Q41 Turbocharger Vane Position Control Solenoid Valve vacuum port. Engine running, command the Turbocharger Vane Position OFF with a scan tool. Verify the vacuum is 0 kPa (0 PSI).

⇒ | If greater than the specified range, replace the Q41 Turbocharger Vane Position Control Solenoid Valve.

6. Command the Turbocharger Vane Position ON with a scan tool. Verify the vacuum is greater than -50 kPa (-7.25 PSI).

⇒ | If less than the specified range, replace the Q41 Turbocharger Vane Position Control Solenoid Valve.

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

⇒ | If restricted, repair or replace as necessary.

8. If all other components test normal, replace the turbocharger.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Vacuum Pump Assembly Replacement

• | LINK 161724

• | Turbocharger Replacement

• | Control Module References for ECM replacement, setup, and programming