Judgement Self-diagnosis

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

When a malfunction is detected, the malfunction route is indicated by flickering of the 4WD warning lamp.

Fig 1: Identifying 4WD Warning Lamp Flickering Pattern For 2 And 3

FLICKERING PATTERN OR FLICKERING CONDITION

Flickering pattern or flickering condition	Items	Malfunction	Check items
2	Output shaft revolution signal (from TCM)	Malfunction is detected in output shaft revolution signal that is output from TCM through CAN communication. Improper signal is input while driving.	"OUTPUT SHAFT REVOLUTION SIGNAL (TCM) "
3	Clutch pressure solenoid signal	Proper voltage is not applied to clutch pressure solenoid valve due to open or short circuit.	"CLUTCH PRESSURE SOLENOID "
4	2-4WD solenoid signal	Proper voltage is not applied to 2-4WD solenoid valve due to open or short circuit.	"2-4WD SOLENOID "
5	Transfer motor	Transfer motor does not operate properly due to open or short circuit in transfer motor or transfer motor relay.	"TRANSFER MOTOR "
6	Vehicle speed signal (from 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.	"VEHICLE SPEED SENSOR (ABS) "
7	CAN communication	Malfunction has been detected from CAN communication line.	"CAN COMMUNICATION LINE "
8	AD converter	AD converter system of transfer control unit is malfunctioning.	"POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT "
9	Transfer fluid temperature	Signal voltage from transfer fluid temperature sensor is abnormally high (Transfer fluid temperature is abnormally low) while driving.	"TRANSFER FLUID TEMPERATURE "
10	Neutral-4LO switch	Improper signal from neutral-4LO switch is input due to open or short circuit.	"NEUTRAL-4LO SWITCH "
11	Clutch pressure switch	Improper signal is input due to open or short circuit. Malfunction occurs in clutch pressure switch or hydraulic circuit.	"CLUTCH PRESSURE SWITCH "
12	Line pressure switch	Improper signal is input due to open or short circuit. Malfunction occurs in line pressure switch or hydraulic circuit.	"LINE PRESSURE SWITCH "
13	Engine speed signal (from ECM)	Malfunction is detected in engine speed signal that is output from ECM through CAN communication. Improper signal is input while driving.	"ENGINE SPEED SIGNAL (ECM) "
14	Accelerator pedal position sensor (from ECM)	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.	"ACCELERATOR CONTROL SYSTEM "
15	Power supply	Power supply voltage for transfer control unit is abnormally low while driving.	"POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT "
16	4WD shift switch	More than two switch inputs are simultaneously detected due to short circuit of 4WD shift switch.	"4WD SHIFT SWITCH "
17	ABS operation signal (from ABS)	Malfunction is detected in ABS operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.	"ABS OPERATION SIGNAL (ABS) "
18	Wait detection switch	Improper signal from wait detection switch is input due to open or short circuit.	"WAIT DETECTION SWITCH "
19	Actuator motor	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.	"ACTUATOR MOTOR ", "POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT "
20	Actuator position switch	Improper signal from actuator position switch is input due to open or short circuit. Malfunction is detected in the actuator position switch.	"ACTUATOR POSITION SWITCH "
21	Actuator circuit	Transfer control device actuator circuit is shorted or open. (Malfunctions are detected when motor relay circuit is open/shorted or relay transfer shift circuit is open/ shorted.) Malfunction occurs in transfer control device drive circuit.	"TRANSFER CONTROL DEVICE "
21	Actuator circuit	Malfunction is detected in transfer shut off relay.	"POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT "
22	VDC operation signal (from VDC)	Malfunction is detected in VDC operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.	"VDC OPERATION SIGNAL (ABS) "
23	TCS operation signal (from TCS)	Malfunction is detected in TCS operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.	"TCS OPERATION SIGNAL (ABS) "
24	PNP switch signal (from TCM)	When A/T PNP switch signal is malfunction or communication error between the vehicles.	"PNP SWITCH SIGNAL (TCM) "
Repeats flickering every 2 to 5 sec.	-	Circuits that the self-diagnosis covers have no malfunction.	-
Repeats flickering every 0.25 sec.	Data erase display	Power supply failure of memory back-up. Battery performance is poor.	"POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT "
No flickering	PNP switch or 4WD shift switch	PNP switch or 4WD shift switch circuit is shorted or open.	"PNP SWITCH SIGNAL (TCM) ", "4WD SHIFT SWITCH "

CAUTION:

If "CAN communication" is displayed with other DTCs, first perform the trouble diagnosis for CAN communication line.
If "ABS operation signal", "VDC operation signal" or "TCS operation signal" is displayed, first perform the trouble diagnosis for ABS system.
If "Output shaft revolution signal" is displayed, first perform the trouble diagnosis for A/T system.

NOTE:

If "actuator position switch" or "actuator circuit" is displayed, first erase self-diagnostic results. ("Actuator position switch" or "actuator circuit" may be displayed after installing transfer control unit or transfer assembly.)
If "clutch pressure switch" or "line pressure switch" is displayed only while driving in reverse, check the continuity of "R" position on A/T PNP switch. When there is nothing wrong with the electrical system, check the hydraulic system.