P0299-TURBOCHARGER UNDERBOOST CONDITION
For a complete wiring diagram, refer to the Wiring Information.
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When Monitored:
With the engine running and the Powertrain Control Module (PCM) attempting to govern Turbocharger boost pressure.
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Set Condition:
The Boost Pressure Sensor indicates actual Turbocharger boost is less than the PCM set point for engine boost for 0.83 second.
Possible Causes |
|---|
| RESTRICTED AIR FILTER |
| INTAKE AIR RESTRICTION |
| INTAKE AIR LEAK |
| TURBOCHARGER ASSEMBLY |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Turn the ignition on. |
| 2. | With the scan tool, clear DTCs in the Powertrain Control Module (PCM). |
| 3. | Test drive the vehicle. |
| 4. | With the scan tool, select View DTCs. |
| NOTE: | If there are any EGR related DTCs, repair the EGR DTCs before continuing with this test. |
Is the status Active for this DTC?
Yes
- Go To 2
No
- Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Turn the ignition off. |
| 2. | 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 in accordance with the service information.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Go To 3
3. CHECK FOR INTAKE SYSTEM RESTRICTIONS
| NOTE: | Damaged, restricted or poorly connected intake and Turbocharger related tubes can cause this DTC to set. |
| 1. | Turn the ignition off. |
| 2. | Inspect all air intake, crankcase vent and turbocharger related hoses/tubes and connections. |
| 3. | Inspect the Charge Air Cooler hoses/tubes and connections. |
| 4. | Inspect the EGR Air Flow Control Valve to ensure the valve is not stuck in the closed position. |
Were any problems found?
Yes
- Repair or replace as necessary.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Go To 4
4. CHECK FOR INTAKE SYSTEM AIR LEAKS
| 1. | Remove the Crankcase Vent Heater. |
| 2. | Remove the Mass Air Flow Sensor from the turbocharger inlet tube. |
| 3. | Seal off and/or plug the turbocharger inlet tube where the MAF sensor was removed. |
| 4. | Connect the Evaporative Emissions Leak Detector (EELD) 8410 to the Crankcase Vent Heater port in the intake duct and begin injecting smoke into the intake system. |
| 5. | Observe all intake system components for evidence of smoke leakage. |
Is there evidence of smoke leakage?
Yes
- Repair or replace as necessary.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace the Turbocharger Assembly in accordance with the service information.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).