Charge air temperature
Check the charge air temperature sensor, coolant temperature sensor, charge air pressure sensor, fuel supply pressure sensor and fan speed sensor, along with the connectors and electrical cables in the circuit.The conditions under which the control unit carries out the test are:Charge air temperature above 3°C.The difference between the charge air temperature and the outdoor temperature should be less than 10°C for 10 seconds.The control unit must carry out the test in four successive cycles. This means that the power must be switched off and on with the starter key four times, at 10 second intervals.You can go into fault code monitoring and look at the fault code. There you can see whether the conditions under which the control unit verifies that the fault is rectified have been met. When the conditions have been met and the test is carried out, the fault code status is displayed during the test. If the fault code is pending, the control unit has detected a fault. If the fault has been rectified, the fault code becomes inactive. Clear the fault code.If the fault has been rectified, the fault code becomes inactive. Clear the fault code.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
The charge air temperature is noticeably lower than the outside temperature when they should be the same. The value from the charge air temperature sensor is not plausible.
Possible causes: The temperature shown by the outdoor temperature sensor is too high. The temperature shown by the charge air temperature sensor is too low.Fault in the circuit of the charge air pressure sensor, coolant temperature sensor, fuel supply pressure sensor or fan speed sensor.