Infiniti QX4 (R50). Manual

Trouble Diagnosis without CONSULT-II

NBTF0011

DESCRIPTION

NBTF0011S01

If the engine starts when there is something wrong with the all-
mode 4WD system, the 4WD warning lamp turns ON or flickers in
the combination meter. When the system functions properly, the
warning lamp turns ON when the ignition switch is turned to “ON”,
and it turns OFF after engine starts.
To locate the cause of a problem, start the self-diagnosis function.
The 4WD warning lamp in the combination meter will indicate the
problem area by flickering according to the self-diagnostic results.
As for the details of the 4WD warning lamp flickering patterns, refer
to TF-29.

IDX

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

Trouble Diagnosis without CONSULT-II

TF-27

INDICATIONS OF 4WD WARNING LAMP

NBTF0011S03

Flickering pattern or flick-

ering condition

Malfunction

Check items

Front revolution sensor circuit is shorted or open.

Revolution sensor (front) circuit,
TF-61.

Rear revolution sensor circuit is shorted or open.

Revolution sensor (rear) [Refer to
AT-111, “DTC P0720 Vehicle Speed
Sensor·A/T (Revolution sensor)”.]

4WD solenoid valve circuit is shorted or open.

4WD solenoid valve circuit, TF-64.

2-4WD shift solenoid valve circuit is shorted or 2WD switch of
4WD shift switch is shorted.

2-4WD shift solenoid valve circuit or
4WD shift switch circuit, TF-66.

Transfer motor relay circuit is shorted or open.

Transfer motor relay circuit, TF-70.

Power supply voltage of throttle position sensor is improper. Or
A/D converter of transfer control unit functions improperly.

Throttle position sensor (Refer to
AT-176, “DTC P1705 Throttle Posi-
tion Sensor”.)

Transfer fluid temperature sensor circuit is open.

Transfer fluid temperature sensor
circuit, TF-73.

Neutral-4LO switch circuit is shorted or open.

Neutral-4LO switch circuit, TF-76.

2-4WD shift solenoid valve circuit, 2WD switch of 4WD shift
switch circuit or clutch pressure switch circuit is shorted or open.

2-4WD shift solenoid valve circuit,
4WD shift switch circuit or clutch
pressure switch circuit, TF-66, 80.

Line pressure switch circuit is shorted or open.

Line pressure switch circuit, TF-83.

Engine speed signal circuit is shorted or open.

Engine speed signal (Refer to
AT-116, “DTC P0725 Engine Speed
Signal”.)

Throttle position sensor circuit is shorted or open.

Throttle position sensor (Refer to
AT-176, “DTC P1705 Throttle Posi-
tion Sensor”.)

Failure in power supply circuit of transfer control unit.

Power supply of transfer control unit

4WD shift switch circuit is shorted.

4WD shift switch circuit, TF-66.

ABS operation signal circuit is shorted.

ABS operation signal circuit, TF-86.

ATP switch, wait detection switch or neutral-4LO switch circuit is
shorted or open.

ATP switch, wait detection switch or
neutral-4LO switch circuit*, TF-76.

Transfer control device actuator motor is faulty. (Abnormalities
are detected when actuator motor fails to operate while shifting
from “4H” to “4LO” or vice versa.)

Actuator motor and motor circuit,
TF-115, 89.

Transfer control device actuator motor arm position sensing
switch is faulty.

Actuator motor arm position sensing
switch and sensing switch circuit,
TF-115, 92.

Transfer control device actuator circuit is faulty (Abnormalities
are detected when motor relay circuit is open/shorted or relay
monitor circuit is open/shorted.)

Actuator motor, actuator motor arm
position sensing switch and their
associated circuits, TF-114, 115 and
94.

Repeats flickering every
2 to 5 sec.

Circuits that the self-diagnosis covers have no malfunction.

—

Repeats flickering every
0.25 sec.

Power supply failure of memory back-up.

Battery is disconnected for a long time.

Battery performance is poor.

Data erase/display circuit, TF-88.

IDX

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

Trouble Diagnosis without CONSULT-II (Cont’d)

TF-29

Infiniti QX4 (R50). Manual - part 566