DTC P0234 or P0299
| DTC P0234 or P0299 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0234
Engine Overboost
DTC P0299
Engine Underboost
| Diagnostic Fault Information |
| Circuit | Short to Ground | High resistance | Open | Short to Voltage | Signal Performance |
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5 V Reference
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P0107, P0193, P0236, P0642
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P0236, P0237
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P0107, P0236
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P0036, P0193, P0236, P050A, P0606, P0643
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P0236
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Intake air pressure signal
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P0237
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P0236, P0237
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P0238
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P0238
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P0234, P0236, P0299
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Low Reference
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-
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P0234, P0236, P0238
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P0098, P0099, P0238
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-
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-
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| Typical Scan Tool Data |
Boost Pressure Sensor
| Circuit | Short to Ground | Open | Short to Voltage |
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Parameter Normal Range:
BARO to 240 kPa
Operating Conditions: Engine Running at various operating conditions |
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5 V Reference
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20-80 kPa
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30-80 kPa
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20-80 kPa
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Boost Pressure Sensor
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0 kPa
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276 kPa
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276 kPa
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Low Reference
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-
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276 kPa
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-
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| Circuit Description |
The intake air pressure sensor is integrated with the intake air temperature (IAT) sensor 2. The intake air pressure sensor measures the range of pressures between the turbocharger and the throttle body. The sensor used on this engine is a three atmosphere sensor. Pressure in this portion of the induction system is affected by engine speed, throttle opening, turbocharger boost pressure, intake air temperature (IAT), barometric pressure (BARO), and the efficiency of the charge air cooler.
The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes, on the intake air pressure signal circuit. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the BARO. When the vehicle is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa. The least pressure that occurs is when the vehicle is idling or decelerating, and it is equal to the BARO.
| Conditions for Running the DTCs |
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DTC P0010, P0013, P0014, P0016, P0017, P0018, P0033, P0034, P0035, P00C0, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0121, P0122, P0123, P0128, P0222, P0223, P0234, P0236, P0237, P0238, P0243, P0245, P0246, P0299, P0606, P16F3, P2227, P2228, P2229, P2230 or P2261 is not set.
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The driver requested boost pressure level exceeds the level of the base boost pressure.
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The engine speed is between 1600-6000 RPM.
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The desired boost pressure is between 140-300 kPa.
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The Barometric Pressure (BARO) is between 60-120 kPa.
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The Engine Coolant Temperature (ECT) is between -40-120°C (-40-248°F).
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The Intake Air Temperature (IAT) is between -40-80°C (-40-176°F)
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The turbocharger wastegate is not under output device control.
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The turbocharger bypass valve is not under output device control.
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The DTCs run continuously when the above conditions have been met.
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| Conditions for Setting the DTC |
P0234
The ECM detects that the actual boost pressure is greater than the desired boost pressure by a calibrated amount for greater than 1.5 s.P0299
The ECM detects that the actual boost pressure is less than the desired boost pressure by a calibrated amount for greater than 1.5 s.| Action Taken When the DTC Sets |
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DTCs P0234 and P0299 are Type B DTCs.
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An indicator will illuminate.
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The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.
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| Conditions for Clearing the MIL/DTC |
DTCs P0234 and P0299 are Type B DTCs.
| Diagnostic Aids |
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The charge air cooler is connected to the turbocharger and to the throttle body by flexible duct work that requires the use of special high torque fastening clamps. These clamps cannot be substituted. In order to prevent any type of air leak when servicing the ductwork, the tightening specifications and proper positioning of the clamps is critical and must be strictly adhered to.
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Use a solution of dish soap and water in a spray bottle to pinpoint any air leaks.
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| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Turbocharger System Description
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
Ignition ON, command the Turbocharger Bypass Solenoid Valve ON and OFF with a scan tool. A click should be heard and felt in response to the commands.
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| 2. |
Command the Turbocharger Wastegate Solenoid between 20-90 % with a scan tool. A series of clicks should be heard and felt in response to the commands.
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| 3. |
Ignition ON, observe the scan tool MAP Sensor, Boost Pressure Sensor and BARO Sensor parameters. Compare the parameters to the
Altitude Versus Barometric Pressure
table. The parameters should be within the specified range displayed in the table for the specific altitude.
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| 4. |
Compare the scan tool MAP Sensor parameter to the Boost Pressure Sensor parameter during a WOT acceleration at the time of the 1-2 shift. The values read off should be between 20 kPa.
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| 5. |
Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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| Circuit/System Testing |
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Verify the integrity of the entire air induction and exhaust systems, including all turbocharger components, by inspecting for the following conditions:
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Damaged components
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Hairline fractures of the boost pressure sensor housing
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Hairline fractures of the MAP sensor housing
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Loose or improper installation
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An air flow restriction
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Vacuum line restrictions
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Vacuum leaks
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An air leak between the turbocharger and the throttle body, including the charge air cooler assembly.
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Verify that an exhaust leak does not exist, including the mating surface area between the turbocharger and the exhaust manifold.
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Verify that restrictions do not exist in the exhaust system. Refer to
Restricted Exhaust
.
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If a condition is found, repair or replace the affected component as necessary.
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| 2. |
If all inspections are normal, test or replace the B65 intake air pressure and temperature sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Intake Air Pressure and Temperature Sensor Replacement
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Control Module References
for ECM replacement, setup, and programming
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