DTC Chart

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

DTC	CONSULT	Diagnostic item is detected when...	Reference
[P1802]	CONTROL UNIT 1	Malfunction is detected in the memory (RAM) system of transfer control unit.	Refer to .
[P1803]	CONTROL UNIT 2	Malfunction is detected in the memory (ROM) system of transfer control unit.
[P1804]	CONTROL UNIT 3	Malfunction is detected in the memory (EEPROM) system of transfer control unit.
[P1807]	VHCL SPEED SEN.AT	Malfunction is detected in output shaft revolution signal that is output from TCM through CAN communication. Improper signal is input while driving.	Refer to .
[P1808]	VHCL SPEED SEN.ABS	Malfunction is detected in vehicle speed signal that is output from ABS actuator and electric unit (control unit) through CAN communication. Improper signal is input while driving.	Refer to .
[P1809]	CONTROL UNIT 4	AD converter system of transfer control unit is malfunctioning.	Refer to .
[P1810]	4L POSI SW TF	Improper signal from neutral-4LO switch is input due to open or short circuit.	Refer to .
[P1811]	BATTERY VOLTAGE	Power supply voltage for transfer control unit is abnormally low while driving.	Refer to .
[P1813]	4WD MODE SW	More than two switch inputs are simultaneously detected due to short circuit of 4WD shift switch.	Refer to .
[P1814]	4WD DETECT SWITCH	Improper signal from wait detection switch is input due to open or short circuit.	Refer to .
[P1816]	PNP SW/CIRC	When transmission range switch signal is malfunction or communication error between the control units.	Refer to .
[P1817]	SHIFT ACTUATOR	Motor does not operate properly due to open or short circuit in actuator motor. Malfunction is detected in the actuator motor. (When 4WD shift switch is operated and actuator motor is not operated) Malfunction is detected in transfer shift high relay and transfer shift low relay.	Refer to .
[P1818]	SHIFT ACT POSI SW	Improper signal from actuator position switch is input due to open or short circuit. Malfunction is detected in the actuator position switch.	Refer to .
[P1819]	SHIFT ACT CIR	Transfer control device actuator circuit is shorted or open. (Malfunctions are detected when transfer shift relay circuit is open/shorted or relay monitor circuit is open/shorted.) Malfunction occurs in transfer control device drive circuit. Malfunction is detected in transfer shut off relay.	Refer to .
[P1820]	ENGINE SPEED SIG	Malfunction is detected in engine speed signal that is output from ECM through CAN communication. Improper signal is input while driving.	Refer to .
[P1822]	DUTY SOLENOID	Proper voltage is not applied to clutch pressure solenoid valve due to open or short circuit.	Refer to .
[P1823]	2-4WD SOLENOID	Proper voltage is not applied to 2-4WD solenoid valve due to open or short circuit.	Refer to .
[P1824]	MOTOR RELAY	Motor does not operate properly due to open or short circuit in transfer motor or transfer motor relay.	Refer to .
[P1826]	OIL TEMP SEN	Signal voltage from transfer fluid temperature sensor is abnormally high (Transfer fluid temperature is abnormally low) while driving.	Refer to .
[P1827]	CLUTCH PRES SW	Improper signal from clutch pressure switch is input due to open or short circuit. Malfunction occurs in clutch pressure switch or hydraulic circuit.	Refer to .
[P1828]	LINE PRES SW	Improper signal from line pressure switch is input due to open or short circuit. Malfunction occurs in line pressure switch or hydraulic circuit.	Refer to .
[P1829]	THROTTLE POSI SEN	Malfunction is detected in accelerator pedal position signal that is output from ECM through CAN communication. Signal voltage from accelerator pedal position sensor is abnormally high or low.	Refer to .
[P1830]	ABS OP SIG	Malfunction is detected in ABS operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.	Refer to .
[P1831]	VDC OP SIG	Malfunction is detected in VDC operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.	Refer to .
[P1832]	TCS OP SIG	Malfunction is detected in TCS operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.	Refer to .
[U1000]	CAN COMM CIRCUIT	When transfer control unit is not transmitting or receiving CAN communication signal for 2 seconds or more.	Refer to
[U1010]	CONTROL UNIT (CAN)	Detecting error during the initial diagnosis of CAN controller of transfer control unit.	Refer to

CAUTION:

If CAN COMM CIRCUIT [U1000] or CONTROL UNIT (CAN) [U1010] is displayed with other DTCs, first perform the trouble diagnosis for CAN communication line.
If ABS OP SIG [P1830], VDC OP SIG [P1831] or TCS OP SIG [P1832] is displayed, first perform the trouble diagnosis for ABS system.
If VHCL SPEED SEN.AT [P1807] is displayed, first perform the trouble diagnosis for A/T system.

NOTE:

If SHIFT ACT POSI SW [P1818] or SHIFT ACT CIR [P1819] is displayed, first erase self-diagnostic results. (SHIFT ACT POSI SW [P1818] or SHIFT ACT CIR [P1819] may be displayed after installing transfer control unit or transfer assembly.)
If CL PRES SW [P1827] or LINE PRES SW [P1828] is displayed only while driving in reverse, check the continuity of R position on transmission range switch. When there is no malfunction found in the electrical system, check the hydraulic system.