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 Descriptor

DTC P2564 00: Turbocharger Boost Control Position Sensor Circuit Low Voltage
DTC P2565 00: Turbocharger Boost Control Position Sensor Circuit High Voltage

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
5-Volt Reference | P0641 | P2564 00 | P0641 | --
Signal | P2564 00 | P2564 00 | P2565 00 | --
Low Reference | -- | P2565 00 | -- | --

### Circuit/System Description

The turbocharger vane position sensor is mounted on the turbo charger vacuum actuator. A 5-V reference voltage and a low reference is supplied to the turbocharger vane position sensor. The sensor provides a signal to the engine control module (ECM) with the actual turbocharger control rod position.

### Conditions for Running the DTC

The ignition is ON or engine is running.

### Conditions for Setting the DTC

The ECM detects a short to ground or a short to Voltage for more than 1 s.

### Action Taken When the DTC Sets

DTCs P2564 and P2565 are Type A DTCs

### Conditions for Clearing the DTC

DTCs P2564 and P2565 are Type A DTCs

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Turbocharger System Description

#### 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 for scan tool information

### Circuit/System Verification

Ignition ON, observe the scan tool Turbocharger Vane Position Sensor. The reading should be between 0.5-4.5 V and change with.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B112 Turbocharger Vane Position Sensor.
2. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.

⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.

⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

4. Verify the scan tool Turbocharger Vane Position Sensor is greater than 4.8 V.

⇒ | If less than the specified range, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 2. Verify the scan tool Turbocharger Vane Position Sensor is less than 0.3 V.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

6. If all circuits test normal, test or replace the B112 Turbocharger Vane Position Sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

LINK X for sensor replacement