The 4WD ECU makes a Motor Pump(Actuator) turn round for generating an oil pressure. And then it presses a multiple disk clutch and transfers the generated torque into rear wheels. Its torque value varies according to a pressure status.
If the 4WD ECU detects that there is an open in the control circuit, it sets P1822 and lets a warning lamp turn on.
Item
Detecting Condition
Possible cause
DTC Strategy
Monitoring voltage in the motor pump circuit
Poor connection
Open in the circuit
Internal error in the coupling
Enable conditions
IG " ON "
Threshold value
Open in the motor driving circuit
Detecting time
0.3 second
Fail Safe
Prohibition for 4WD control