2007 Liberty KJ Factory Service Manual 9 - ENGINE

P0105-TURBOCHARGER INLET PRESSURE SENSOR SIGNAL VOLTAGE TOO HIGH





For a complete wiring diagram Refer to Section 8W



Possible Causes
 
BOOST PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
 
BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
 
BOOST PRESSURE SENSOR GROUND CIRCUIT OPEN
 
BOOST PRESSURE SENSOR
 
POOR CONNECTOR TERMINAL CONTACT
 
ENGINE CONTROL MODULE (INTERNAL)
 
ENGINE CONTROL MODULE (SENSOR SIGNAL SHORTED TO VOLTAGE)
 




Diagnostic Test

1. CHECKING FOR CURRENT DTC

NOTE: If a P0234 or P0299 DTC is present with this DTC, diagnose P0234 or P0299 DTC before continuing.


NOTE: If DTC P0641, P0651 or P0697 is present with this DTC, diagnose DTCs P0641, P0651 or P0697 before diagnosing this DTC.


NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.


NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.


NOTE: Ensure all turbocharger inlet and outlet tubes are connected properly, without damage and restriction before continuing with this test. Also ensure the wastegate actuator and actuator rod are attached and functioning properly.


Turn the ignition on.
With the scan tool, erase ECM DTCs.
Cycle the ignition key on and off several times, leaving the key on for at least 10 seconds at a time.
With the scan tool, read ECM DTCs.

Did this DTC set again?

Yes


No

2. MEASURE THE BOOST PRESSURE SENSOR SIGNAL CIRCUIT VOLTAGE



Turn the ignition off.
Disconnect the Boost Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage between ground and the Boost Pressure Sensor Signal circuit.

Is the voltage above 1.0 volt?

Yes


No

3. BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE



Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage between ground and the Boost Pressure Sensor Signal circuit.

Is the voltage above 1.0 volt?

Yes


No

4. BOOST PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE



Measure the voltage between ground and the Boost Pressure Sensor Ground circuit.

NOTE: If the Sensor Ground circuit had a short to voltage on it, the ECM could be damaged. Retest the Fuel Pressure Sensor circuit.



Is the voltage above 1.0 volt?

Yes


No

5. BOOST PRESSURE SENSOR GROUND CIRCUIT OPEN



Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit.

Is the resistance below 10.0 ohms?

Yes


No

6. BOOST PRESSURE SENSOR



NOTE: Ensure all harness connectors are connected.


Turn the ignition on.
Measure the voltage of the Boost Pressure Sensor Signal circuit by back probing ECM harness connector C1, cavity 63.

Is the voltage above 4.85 volts?

Yes


No

7. POOR CONNECTOR TERMINAL CONTACT

With the scan tool, erase ECM DTCs.
With the scan tool, read ECM DTCs.

Did this DTC set again?

Yes


No