Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition
If engine speed (RPM) is above 3500 rpm and the engine is operating at a high load, the control signal to the turbocharger (TC) control valve is at maximum and the boost pressure (from boost pressure sensor) is lower than a designated value (approximately 20 kPa (2.9 psi) under normal boost pressure - signal too low).
If the air mass (from mass air flow (MAF) sensor) is higher than a desired value (signal too high) it is interpreted as a fault and diagnostic trouble code (DTC) ECM-6806 is stored.

Substitute value
reduced boost pressure

Possible source

Signal too high:
- air leakage after turbocharger (TC)

Signal too low:
- hoses between turbocharger (TC) and turbocharger (TC) control valve respectively turbocharger (TC) control valve and pressure servo are loose or are blocked/damaged
- faulty turbocharger (TC) control valve
- faulty boost pressure control (BPC) valve pressure servo
- sticking boost pressure control (BPC) valve

Fault symptom[s]
- none