Diagnostic Trouble Code (DTC) Information ECM-6814

Condition 

The diagnostic trouble code (DTC) is stored if the ratio between the measured boost pressure (measured value from the boost pressure sensor before the throttle) and the calculated boost pressure (calculated value after the throttle) is incorrect. The fault for "Signal too low" is diagnosed by the control module when the turbocharger (TC) control system is active, while the fault for "Signal too high" is diagnosed by the control module when the turbocharger (TC) control system is inactive.

Substitute Value 

Reduced boost pressure.

Possible Source 

Signal too high / Signal too low 

• Air leakage downstream of the turbocharger (TC) (between the turbocharger (TC) and the throttle unit)
• The boost pressure sensor has come loose (measures the atmospheric pressure)
• Damaged boost pressure sensor.
• Damaged check valve to crankcase ventilation.

Fault symptom[s] 

• Poor performance.