4WD NISSAN NAVARA 2005 Repair Workshop Manual

TROUBLE DIAGNOSIS
TF-49
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Self-Diagnostic ProcedureEDS0031X
SELF-DIAGNOSTIC PROCEDURE (WITH CONSULT-II)
Refer toTF-45, "SELF-DIAG RESULT MODE".
SELF-DIAGNOSTIC PROCEDURE (WITHOUT CONSULT-II)
Description
If the engine starts when there is something wrong with the 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 begin trouble diagnosis, start the self-
diagnosis function. The 4WD warning lamp in the combination meter will flicker according to the self-diagnos-
tic results. As for the details of the 4WD warning lamp flickering patterns, refer toTF-49, "
Diagnostic Proce-
dure (A/T models)",TF-49, "Diagnostic Procedure (M/T models)".
Diagnostic Procedure (A/T models)
1. Warm up engine.
2. Turn ignition switch “ON” and “OFF” at least twice, and then turn ignition switch “OFF”.
3. Move A/T selector lever to “P” position.
4. Turn 4WD shift switch to “2WD” position.
5. Turn ignition switch “ON”. (Do not start engine.)
6. 4WD warning lamp ON.
If 4WD warning lamp does not turn ON, refer toTF-91, "
4WD Warning Lamp Does Not Turn ON".
7. Move A/T selector lever to “R” position.
8. Turn 4WD shift switch to “2WD”, “4H” and “2WD” in order.
9. Move A/T selector lever to “P” position.
10. Turn 4WD shift switch to “4H”, “2WD” and “4H” in order.
11. Move A/T selector lever to “N” position.
12. Turn 4WD shift switch to “2WD” position.
13. Move A/T selector lever to “P” position.
14. Read the flickering of 4WD warning lamp.
Refer toTF-50, "
Judgement Self-diagnosis".
Diagnostic Procedure (M/T models)
1. Warm up engine.
2. Turn ignition switch “ON” and “OFF” at least twice, and then turn ignition switch “OFF”.
3. Move M/T shift lever to neutral position.
4. Turn 4WD shift switch to “2WD” position.
5. Turn ignition switch “ON”. (Do not start engine.)
6. 4WD warning lamp ON.
If 4WD warning lamp does not turn ON, refer toTF-91, "
4WD Warning Lamp Does Not Turn ON".
7. Move M/T shift lever to any position other than neutral.
8. Turn 4WD shift switch to “2WD”, “4H” and “2WD” in order.
9. Move M/T shift lever to neutral position.
10. Turn 4WD shift switch to “4H”, “2WD” and “4H” in order.
11. Move M/T shift lever to any position other than neutral.
12. Turn 4WD shift switch to “2WD” position.
13. Move M/T shift lever to neutral position.
14. Read the flickering of 4WD warning lamp.
Refer toTF-50, "
Judgement Self-diagnosis".

TF-50
TROUBLE DIAGNOSIS
Judgement Self-diagnosis
When a malfunction is detected, the malfunction route is indicated by flickering of the 4WD warning lamp.
PDIA0227E
Flickering pattern Items Diagnostic item is detected when... Check item
2Output shaft revolution
signal (from TCM)
lMalfunction is detected in output shaft revolution signal
that is output from TCM through CAN communication.
lImproper signal is input while driving.TF-55, "
Output Shaft
Revolution Signal
(TCM)"
3Vehicle speed signal
[from ABS actuator and
electric unit (control
unit)]
lMalfunction is detected in vehicle speed signal that is
output from ABS actuator and electric unit (control unit)
through CAN communication.
lImproper signal is input while driving.TF-55, "
Vehicle Speed
Sensor (ABS)"
4 CAN communication Malfunction has been detected from CAN communication.TF-82, "CAN Commu-
nication Line"
5 AD converterAD converter system of transfer control unit is malfunction-
ing.TF-54, "Transfer Con-
trol Unit"
6 4LO switchImproper signal from 4LO switch is input due to open or
short circuit.TF-56, "4LO Switch"
7Engine speed signal
(from ECM)
lMalfunction is detected in engine speed signal that is out-
put from ECM through CAN communication.
lImproper signal is input while driving.TF-81, "
Engine Speed
Signal (ECM)"
8 Power supplyPower supply voltage for transfer control unit is abnormally
low while driving.TF-52, "
Power Supply
Circuit For Transfer
Control Unit"
9 4WD shift switchMore than two switch inputs are simultaneously detected
due to short circuit of 4WD shift switch.TF-59, "4WD Shift
Switch"
10 Wait detection switchImproper signal from wait detection switch is input due to
open or short circuit.TF-63, "Wait Detection
Switch"
11 Actuator motor
lMotor does not operate properly due to open or short cir-
cuit in actuator motor.
lMalfunction is detected in the actuator motor. (When
4WD shift switch is operated and actuator motor is not
operated.)
lMalfunction is detected in transfer shift high relay and
transfer shift low relay.TF-67, "
Actuator Motor"
12Actuator position
switch
lImproper signal from actuator position switch is input due
to open or short circuit.
lMalfunction is detected in the actuator position switch.TF-75, "
Actuator Posi-
tion Switch"
13 Transfer control device
lMalfunction is detected in transfer shut off relay 1 and
transfer shut off relay 2.
lMalfunction occurs in transfer control device drive circuit.TF-52, "
Power Supply
Circuit For Transfer
Control Unit",TF-78,
"Transfer Control
Device"
14 PNP switch signalWhen A/T PNP switch signal is malfunction or communica-
tion error between the vehicles.TF-66, "PNP Switch
Signal (TCM)"

TROUBLE DIAGNOSIS
TF-51
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TFNOTE:
If flickering pattern 12 or 13 is displayed, first erase self-diagnostic results. Flickering pattern 12 or 13 may be displayed after installing
transfer control unit or transfer assembly.
ERASE SELF-DIAGNOSIS
lIn order to make it easier to find the cause of hard-to-duplicate malfunctions, malfunction information is
stored into the control unit as necessary during use by the user. This memory is not erased no matter how
many times the ignition switch is turned ON and OFF.
lHowever, this information is erased by turning ignition switch “OFF” after performing self-diagnostics or by
erasing the memory using the CONSULT-II.
Repeats flickering
every 0.25 sec.Data erase displaylPower supply malfunction of memory back-up.
lBattery is disconnected for a long time.
lBattery performance is poor.TF-52, "
Power Supply
Circuit For Transfer
Control Unit"
Repeats flickering
every 2 to 5 sec.— Circuits that the self-diagnosis covers have no malfunction. —
No flickeringPNP switch or 4WD
shift switchPNP switch or 4WD shift switch circuit is shorted or open.TF-66, "
PNP Switch
Signal (TCM)"orTF-
59, "4WD Shift Switch"
Flickering pattern Items Diagnostic item is detected when... Check item

TROUBLE DIAGNOSIS FOR SYSTEM
TF-55
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2.PERFORM SELF-DIAGNOSIS (WITH CONSULT-II)
With CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Touch “ERASE”.
4. Turn ignition switch “OFF” and wait at least 10 seconds.
5. Perform the self-diagnosis again.
Is the
“CONTROL UNIT 1 [P1802]”,“CONTROL UNIT 2 [P1803]”,“CONTROL UNIT 3 [P1804]”or“CONTROL
UNIT 4 [P1809]”displayed?
YES >> Replace transfer control unit. Refer toTF-100, "Removal and Installation".
NO >>INSPECTION END
3.PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-II)
Without CONSULT-II
1. Perform the self-diagnosis and then erase self-diagnostic results. Refer toTF-49, "
SELF-DIAGNOSTIC
PROCEDURE (WITHOUT CONSULT-II)"andTF-51, "ERASE SELF-DIAGNOSIS".
2. Perform the self-diagnosis again.
Do the self-diagnostic results indicate AD converter?
YES >> Replace transfer control unit. Refer toTF-100, "Removal and Installation".
NO >>INSPECTION END
Output Shaft Revolution Signal (TCM)EDS00320
DIAGNOSTIC PROCEDURE
1.CHECK DTC WITH TCM
Perform self-diagnosis with TCM. Refer toAT-80, "
SELF-DIAGNOSTIC RESULT MODE".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer toTF-38, "
Transfer Control Unit Input/Output Signal Ref-
erence Values".
OK or NG
OK >> GO TO 3.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
3.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >>INSPECTION END
NG >> Perform self-diagnosis with TCM again. Refer toAT-80, "
SELF-DIAGNOSTIC RESULT MODE".
Vehicle Speed Sensor (ABS)EDS00321
DIAGNOSTIC PROCEDURE
1.CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer toBRC-18, "
Self-Diagnosis".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.

TF-56
TROUBLE DIAGNOSIS FOR SYSTEM
2.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer toTF-38, "
Transfer Control Unit Input/Output Signal Ref-
erence Values".
OK or NG
OK >> GO TO 3.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
3.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >>INSPECTION END
NG >> Perform self-diagnosis with ABS actuator and electric unit (control unit) again. Refer toBRC-18,
"Self-Diagnosis".
4LO SwitchEDS00322
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.Monitored item Content Condition Display value
4L POSI SW [ON/OFF] Condition of 4LO switch
lVehicle stopped
lEngine running
lFor A/T models, A/T
selector lever “N” posi-
tion with brake pedal
depressed.
lFor M/T models, M/T
shift lever neutral posi-
tion with clutch and
brake pedal depressed.4WD shift switch: 4LO ON
Except the above OFF
Te r m i n a lWire
colorItem Condition Data (Approx.)
24 Y 4LO switch
lVehicle stopped
lEngine running
lFor A/T models,
A/T selector
lever “N” position
with brake pedal
depressed.
lFor M/T models,
M/T shift lever
neutral position
with clutch and
brake pedal
depressed.4WD shift switch: 4LO 0V
Except the above Battery voltage

TROUBLE DIAGNOSIS FOR SYSTEM
TF-57
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TF
DIAGNOSTIC PROCEDURE
1.CHECK 4LO POSITION SWITCH SIGNAL
With CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Read out the value of “4L POSI SW”.
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector
terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
Condition Display value
lVehicle stopped
lEngine running
lFor A/T models, A/T selector
lever “N” position with brake
pedal depressed.
lFor M/T models, M/T shift lever
neutral position with clutch and
brake pedal depressed.4WD shift switch: 4LO ON
Except the above OFF
PDIA0220E
Connector Terminal ConditionVo l ta g e
(Approx.)
M10524 -
Ground
lVehicle stopped
lEngine running
lFor A/T models,
A/T selector lever
“N” position with
brake pedal
depressed.
lFor M/T models,
M/T shift lever
neutral position
with clutch and
brake pedal
depressed.4WD shift switch: 4LO 0V
Except the aboveBattery
voltage
SDIA3363E

TROUBLE DIAGNOSIS FOR SYSTEM
TF-59
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6.CHECK DTC
Perform the self-diagnosis, after driving the vehicle for a while.
OK or NG
OK >>INSPECTION END
NG >> Replace transfer control unit. Refer toTF-100, "
Removal and Installation".
COMPONENT INSPECTION
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect 4LO switch harness connector.
3. Remove 4LO switch. Refer toTF-21, "
Location of Electrical Parts".
4. Push and release 4LO switch and check continuity between
4LO switch terminals 12 and 13.
5. If NG, replace the 4LO switch. Refer toTF-21, "
Location of Elec-
trical Parts".
4WD Shift SwitchEDS00323
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.Terminal Condition Continuity
12 - 13Push 4LO switch Yes
Release 4LO switch No
PDIA0204E
Monitored item [Unit] Content Condition Display value
2WDSWITCH[ON/
OFF]Input condition from 4WD
shift switch4WD shift switch: 2WD ON
4WD shift switch: 4H and 4LO OFF
4H SWITCH [ON/OFF]Input condition from 4WD
shift switch4WD shift switch: 4H ON
4WD shift switch: 2WD and 4LO OFF
4L SWITCH [ON/OFF]Input condition from 4WD
shift switch4WD shift switch: 4LO ON
4WD shift switch: 2WD and 4H OFF
4WD MODE [2H/4H/4L]Control status of 4WD
(Output condition of 4WD
shift indicator lamp and
4LO indicator lamp)4WD shift switch
(Engine running)2WD 2H
4H 4H
4LO 4L
TerminalWire
colorItem Condition Data (Approx.)
14 G 4WD shift switch (2WD)
Ignition switch: ON4WD shift switch: 2WD Battery voltage
4WD shift switch: 4H and 4LO 0V
15 O 4WD shift switch (4H)4WD shift switch: 4H Battery voltage
4WD shift switch: 2WD and 4LO 0V
16 W 4WD shift switch (4LO)4WD shift switch: 4LO Battery voltage
4WD shift switch: 2WD and 4H 0V

TF-60
TROUBLE DIAGNOSIS FOR SYSTEM
DIAGNOSTIC PROCEDURE
1.CHECK 4WD SHIFT SWITCH SIGNAL
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select “DATA MONITOR” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Read out ON/OFF switching action of the “2WD SWITCH”, “4H
SWITCH”, “4L SWITCH” while operating 4WD shift switch.
Without CONSULT-II
1. Turn ignition switch “ON”.
2. Check voltage between transfer control unit harness connector
terminals and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
SDIA2382E
Connector Terminal ConditionVoltage
(Approx.)
M10514 - Ground4WD shift switch: 2WD Battery voltage
4WD shift switch: 4H and 4LO 0V
15 - Ground4WD shift switch: 4H Battery voltage
4WD shift switch: 2WD and 4LO 0V
16 - Ground4WD shift switch: 4LO Battery voltage
4WD shift switch: 2WD and 4H 0V
SDIA3365E

TROUBLE DIAGNOSIS FOR SYSTEM
TF-61
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TF
2.CHECK 4WD SHIFT SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect 4WD shift switch harness connector.
3. Check voltage between 4WD shift switch harness connector ter-
minal 1 and ground.
4. Turn ignition switch “ON”. (Do not start engine.)
5. Check voltage between 4WD shift switch harness connector ter-
minal 1 and ground.
OK or NG
OK >> GO TO 3.
NG >> 1. Check harness for short or open between 4WD shift
switch harness connector M51 terminal 1 and transfer
shut off relay 2 harness connector E85 terminal 5 and
10A fuse (No. 64 located in the fuse and relay box). If any items are damaged, repair or replace
damaged parts.
2. Perform trouble diagnosis for power supply circuit. Refer toTF-52, "
Power Supply Circuit For
Transfer Control Unit".
3.CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER CONTROL UNIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the 4WD shift switch harness connector.
3. Check continuity between the following terminals.
–Transfer control unit harness connector M105 terminal 14 and
4WD shift switch harness connector M51 terminal 3.
–Transfer control unit harness connector M105 terminal 15 and
4WD shift switch harness connector M51 terminal 5.
–Transfer control unit harness connector M105 terminal 16 and
4WD shift switch harness connector M51 terminal 6.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
Connector Terminal Voltage (Approx.)
M51 1 - Ground 0V
SDIA2803E
Connector Terminal Voltage (Approx.)
M51 1 - Ground Battery voltage
SDIA2802E
Continuity should exist.
SDIA3366E

TF-62
TROUBLE DIAGNOSIS FOR SYSTEM
4.CHECK 4WD SHIFT SWITCH
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove 4WD shift switch harness connector.
3. Operate 4WD shift switch and check continuity between 4WD
shift switch terminals.
OK or NG
OK >> GO TO 5.
NG >> Replace 4WD shift switch.
5.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer toTF-38, "
Transfer Control Unit Input/Output Signal Ref-
erence Values".
OK or NG
OK >> GO TO 6.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
6.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >>INSPECTION END
NG >> Replace transfer control unit. Refer toTF-100, "
Removal and Installation".
COMPONENT INSPECTION
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove 4WD shift switch harness connector.
3. Operate 4WD shift switch and check continuity between 4WD
shift switch terminals.
4. If NG, replace the 4WD shift switch.
Terminal Condition Continuity
1-34WD shift switch: 2WD Yes
4WD shift switch: 4H and 4LO No
1-54WD shift switch: 4H Yes
4WD shift switch: 2WD and 4LO No
1-64WD shift switch: 4LO Yes
4WD shift switch: 2WD and 4H No
SDIA2805E
Terminal Condition Continuity
1-34WD shift switch: 2WD Yes
4WD shift switch: 4H and 4LO No
1-54WD shift switch: 4H Yes
4WD shift switch: 2WD and 4LO No
1-64WD shift switch: 4LO Yes
4WD shift switch: 2WD and 4H No
SDIA2805E