Diagnostic Trouble Code (DTC) Information

Condition

Fig 1: Identifying Camshaft Reset Valve (Continuous Variable Valve Timing (CVVT))

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) ECM-6400 is stored if the engine control module (ECM) registers a fault in the signal cable to the camshaft reset valve.

Substitute Value

shutting off the variable camshaft.

Possible Source

Signal too high:

short-circuit to supply voltage in the signal cable
defective camshaft reset valve.

Signal too low:

short-circuit to ground in the signal cable
short-circuit to ground in the voltage supply cable
defective camshaft reset valve
contact resistance.

Signal missing:

defective camshaft reset valve
open-circuit in the signal cable
open-circuit in the voltage supply cable.

Fault symptom[s]

malfunction indicator lamp (MIL) lit
uneven idling.