Diagnostic Instructions

DTC Descriptors

DTC P2564: Turbocharger Boost Control Position Sensor Circuit Low Voltage

DTC P2565: Turbocharger Boost Control Position Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Turbocharger Vane Position Sensor 5-Volt Reference	P0107, P0698, P2564	P003A, P2563	P2564	P0106, P0699, P2565	P2563
Turbocharger Vane Position Sensor Signal Circuit	P2564	P2563	P2564	P2565	P2563
Turbocharger Vane Position Sensor Low Reference Circuit	--	P003A, P2563	P2565	--	P2563

Typical Scan Tool Data

TC Vane Position Sensor

Circuit	Short to Ground	Open	Short to Voltage
Parameter Normal Range: Varies, TC Vane Position Sensor Parameter Matches Desired TC Vane Position Parameter
5-Volt Reference Circuit	0%	--	100%
Turbocharger Vane Position Sensor Signal Circuit	0%	0%	100%
Low Reference Circuit	--	100%	--

Circuit/System Description

The position of the turbocharger vanes is controlled by the engine control module (ECM). The ECM commands the TC vane position solenoid to change the position of vanes in order to vary boost depending upon the load requirements of the engine. The TC vane position sensor provides the ECM with a signal voltage relative to position of the turbocharger vanes.

Conditions for Running the DTC

P2564

P2565

Conditions for Setting the DTC

P2564

The ECM detects that the turbocharger vane position sensor voltage is less than 0.28 volt for greater than 1 second.

P2565

The ECM detects that the turbocharger vane position sensor signal voltage is greater than 4.7 volts for greater than 1 second.

Action Taken When the DTC Sets

DTCs P2564 and P2565 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P2564 and P2565 are Type B DTCs.

Diagnostic Aids

Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories .

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Description and Operation

Electrical Information Reference

DTC Type Reference

Scan Tool Reference

Circuit/System Verification

1. If DTCs P0698 or P0699 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnostics.
2. Engine running, observe the scan tool TC Vane Position Sensor and the Desired Vane Position parameters.
3. Engine running, slowly increase the engine speed to 2,500 RPM, then return the engine speed to idle. The TC Vane Position Sensor parameter should remain near or equal to the Desired Vane Position parameter.
4. Engine running, observe the DTC information with a scan tool. DTCs P2564 or P2565 should not set.
5. Operate the vehicle within the Conditions for Running the DTC. 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 position sensor.
2. Ignition OFF, allow sufficient time for the control module to power down. This can be verified by a loss of communication between the control module and the scan tool.
3. Ignition OFF, test for less than 5 ohms between the low reference terminal C 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 control module.

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

⇒	If less than the specified range, test the 5-volt reference circuit for a an open/high resistance. If the circuit tests normal, replace the control module.

5. Verify the scan tool TC Vane Position Sensor parameter is less than 2 percent.

⇒	If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the control module.

6. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal D. Verify the scan tool TC Vane Position Sensor parameter is greater than 98 percent.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module.

7. If all circuits test normal, test the TC vane position sensor. Refer to Component Testing for instructions.

Component Testing

1. Ignition OFF, disconnect the harness connector at the TC vane position sensor.
2. Remove the TC vane position sensor.
3. Connect the TC vane position sensor harness connector.
4. Ignition ON, observe the scan tool TC Vane Position Sensor parameter for a smooth percentage change without any spikes or drop-outs while slowly depressing the button at the engine of the TC vane position sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.