The 4WD ECU gets current pressure from a pressure which is installed at the coupling. And it controls a Motor Pump in order to generate a target oil pressure which will be tranfering a torque into rear wheels.
If the 4WD ECU detects that the power voltage is lower than a normal value, it sets P1826 and lets a warning lamp turn on.
Item
Detecting Condition
Possible cause
DTC Strategy
Checking power voltage of pressure sensor
Short in the circuit
Internal error in the coupling
Enable conditions
IG ON or Engine ON
Threshold value
The supply voltage of pressure sensor <= 4,75V
Detecting time
1 second
Fail Safe
Prohibition for 4WD control
Fig.1) Idle state