Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURES - P0234-BOOST PRESSURE SENSOR NEGATIVE DEVIATION
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 |
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 DRB 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. Turn the ignition on.With the DRBIII®, erase ECM DTCs.Test drive the vehicle.Monitor the DRBIII® for ECM DTCs.Did this DTC set again?Yes --> Go To 2No --> Test Complete. |
All |
| 2 | Turn the ignition off. Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause air flow restriction. Were any of these problems found? Yes --> Replace the Air Filter element. Perform ROAD TEST VERIFICATION - VER-2 . No --> Go To 3 |
All |
| 3 |
NOTE:
Inspect all air intake and turbocharger related tubes for damage, restriction or poor connection. Any of these conditions can cause a this DTC to set. Turn the ignition off.Inspect all air intake and turbocharger related tubes and connections.Were any problems found?Yes --> Repair or replace as necessary.Perform ROAD TEST VERIFICATION - VER-2 .No --> Go To 4 |
All |
| 4 | Turn the ignition off. Refer to Symptom List: P0234-BOOST PRESSURE SENSOR NEGATIVE DEVIATION; P0299-BOOST PRESSURE SENSOR POSITIVE DEVIATION to check the turbocharger vacuum supply system. Were any problems found? Yes --> Repair as necessary Perform ROAD TEST VERIFICATION - VER-2 . No --> Go To 5 |
All |
| 5 | Turn the ignition off. Remove the Inlet Pressure Sensor. Connect smoke machine 84-04 to the Inlet Pressure Sensor port in the intake duct and begin injecting smoke into the intake system. Observe all intake system components for evidence of smoke leakage. Is there evidence of smoke leakage? Yes --> Repair or replace as necessary. Perform ROAD TEST VERIFICATION - VER-2 . No --> Go To 6 |
All |
| 6 | Turn the ignition off. Replace the Boost Pressure Actuator in accordance with the Service Information.
NOTE:
Ensure the ECM and Boost Pressure Actuator harness connectors are connected. Test drive the vehicle. With the DRB, check for this DTC to set again. Did this DTC set again? Yes --> Replace the Turbocharger assembly in accordance with the Service Information. Perform ROAD TEST VERIFICATION - VER-2 . No --> Replace the Boost Pressure Actuator. Perform ROAD TEST VERIFICATION - VER-2 . |
All |