T8 / P0244 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Limp home
Charge Air Control Valve Circuit, Performance problem
Fault symptom
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
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On-board diagnosis
Type of diagnosis:
Enable criteria:
| General conditions for this DTC |
| Engine temperature above -7°C. |
| Lowest atmospheric pressure 72 kPa. |
| NONE of the following DTCs must be detected: |
| • | Engine temperature over 71°C. |
| • | Engine speed more than 1900 rpm. |
| • | Charge air pressure more than current atmospheric pressure + 39 kPa. |
| • | Throttle position 10% - 50%. |
Fault criteria:
| • | When the air mass is 250 mg/C higher than the requested value. |
| • | When the actual boost pressure is 20 to 25 kPa higher than requested. |
Dependent:
System reaction to a fault:
| Torque limited to max. 170Nm. |
OK report:
| Test 1 and Test 2 completed once and fault criteria not fulfilled. |
Fault handling:
| (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:
| Turbo system fault causing high boost pressure. |
| A check to ensure that the boost pressure is not excessive is made when the engine load is moderate and constant. |
Functions in the diagnostic tool related to the fault:
| • | Charge Air Absolute Pressure |
| • | Manifold Absolute Pressure |
| • | Atmosphere Absoslute Pressure |
| • | Charge Air Control Valve |
| • | Charge Air Control Valve |
| (See also description of readings/activations in diagnostic tool) |
