P0299-BOOST PRESSURE SENSOR POSITIVE DEVIATION
((This code needs to be cancelled by a scanner.))
For a complete wiring diagram Refer to Section 8W
² When Monitored:
With the engine running.
² Set Condition:
The Boost Pressure Sensor indicates actual turbocharger boost is greater than the ECM setpoint.
Possible Causes
AIR FILTER
AIR RESTRICTION
CHECKING FOR AIR LEAKS
CHECKING THE BOOST CONTROL VACUUM SUPPLY
BOOST PRESSURE ACTUATOR
TURBOCHARGER
Diagnostic Test
1. CHECK FOR ACTIVE 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.
NOTE: If DTC P0401 or P0402 is present with this DTC, diagnose P0401 or P0402 before diagnosing this DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Test drive the vehicle.
Monitor the scan tool for ECM DTCs.
NOTE: A clogged Boost Pressure Solenoid Air Filter can cause this DTC to set. Inspect this filter and replace as necessary before continuing with this test.
Did this DTC set again?
Yes >> Go To 2
No >> Test Complete.
2. AIR FILTER
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 the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No >> Go To 3
3. AIR RESTRICTION
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, crankcase vent and turbocharger related tubes and connections.
Were any problems found?
Yes >> Repair or replace as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No >> Go To 4
4. CHECKING THE BOOST CONTROL VACUUM SUPPLY
Turn the ignition off.
Refer to symptom Checking The Boost Control Vacuum Supply to check the turbocharger vacuum supply system.
Were any problems found?
Yes >> Repair as necessary
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No >> Go To 5
5. CHECKING FOR AIR LEAKS
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 the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No >> Go To 6
6. BOOST PRESSURE ACTUATOR
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 scan tool, check for this DTC to set again.
Did this DTC set again?
Yes >> Replace the Turbocharger assembly in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No >> Replace the Boost Pressure Actuator.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING
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