P0033
P0033 00
System Bypass, charge air control, malfunction
Fault symptom
- CHECK ENGINE
- Limp home
On-board diagnosis
Type of diagnosis:
- Continuous
Enable criteria:
- Battery voltage must be between 11 - 16 V.
- NONE of the following DTCs must be detected:
- P0685, P0686, P0687
- Engine running.
- Engine speed less than 3500 rpm.
- Output to solenoid valve is inactive.
- The boost pressure should be more than the atmospheric pressure +35 kPa.
- Intake pressure should be less than or equal to 35 kPa.
- When the conditions are fulfilled, the values for boost pressure and air mass are stored for evaluation.
Fault criteria:
- When the average values for boost pressure and air mass exceed 1.3 kPa and 2.4 g/s, respectively.
Dependent:
- None
System reaction to a fault:
- Torque limited to max. 170 Nm.
- Boost pressure adaption is blocked and reset.
- Boost pressure control is blocked.
- The system continues to function with a calculated air mass instead of the value from the mass air flow sensor.
OK report:
- When the average value for boost pressure and air mass is below 0.6 kPa and 1.3 g/s, respectively.
Fault handling:
Type III
- (See section Fault handling III, "Other emission-related components and functions" for more information.)
Checking the wiring harness
- Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.
Diagnostic help
Diagnosis regards:
- The vacuum section of the system and the function of the valve.
- Tip!
- The by-pass function is checked when the accelerator pedal is rapidly released during moderate acceleration.
Functions in the diagnostic tool related to the fault:
Test value:
- Tachometer
- Absolute pressure sensor, charge air
- Manifold absolute pressure sensor
- Air Mass
- Atmospheric Pressure
- Charge Air Bypass Valve
Activation:
- Charge Air Bypass Valve
(See also description of readings/activations in diagnostic tool)