INFINITI QX56 2006 Factory Service Manual
Manufacturer: INFINITI, Model Year: 2006, Model line: QX56, Model: INFINITI QX56 2006Pages: 3383, PDF Size: 51.76 MB
Page 3201 of 3383
TF-96
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
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.Te r m i n a l
Wire
color Item Condition Data (Approx.)
14 LG Transfer motor relay
Accelerator
pedal depressed
Vehicle stopped
Engine running
Brake pedal
depressed 4WD shift switch: 2WD
Battery voltage
4WD shift switch: AUTO or 4LO (A/T
selector lever “P ” or “ N” position) Battery voltage
(0V for approx.
2 sec. after
shifting to
“P ”
and “N ”.)
4WD shift switch: AUTO or 4LO (Except
for A/T selector lever “P ” or “N ” position) 0V
4WD shift switch: 4H (A/T selector lever
“ P ” position) Battery voltage
(0V for approx.
2 sec. after
shifting to
“P ”.)
4WD shift switch: 4H (Except for A/T
selector lever “P ” position) 0V
41 R Transfer motor relay monitor
Accelerator
pedal depressed
Vehicle stopped
Engine running
Brake pedal
depressed 4WD shift switch: 2WD
0V
4WD shift switch: AUTO or 4LO (A/T
selector lever “P ” or “ N” position) 0V
(Battery volt-
age for approx.
2 sec. after
shifting to
“P ”
and “N ”.)
4WD shift switch: AUTO or 4LO (Except
for A/T selector lever “P ” or “N ” position) Battery voltage
4WD shift switch: 4H (A/T selector lever
“ P ” position) 0V
(Battery volt-
age for approx.
2 sec. after
shifting to
“P ”.)
4WD shift switch: 4H (Except for A/T
selector lever “P ” position) Battery voltage
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TROUBLE DIAGNOSIS FOR SYSTEMTF-97
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Revision: November 2009 2006 QX56
DIAGNOSTIC PROCEDURE
1. CHECK TRANSFER MOTOR RELAY 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 “MOTOR RELAY” and “MOTOR RELAY
MON ”.
Without CONSULT-II
1. Start engine.
Monitored item Condition Display value
(Approx.)
MOTOR
RELAY
Accelerator
pedal depressed
Vehicle stopped
Engine running
Brake pedal
depressed 4WD shift switch: 2WD OFF
4WD shift switch: AUTO or
4LO (A/T selector lever
“P ” or
“ N ” position) OFF
("ON" for
approx. 2 sec.
after shifting to
“
P ” and “ N”.)
4WD shift switch: AUTO or
4LO (Except for A/T selector
lever “P ” or “N ” position) ON
4WD shift switch: 4H (A/T
selector lever “P ” position) OFF
("ON" for
approx. 2 sec.
after shifting to
“
P ”.)
4WD shift switch: 4H (Except
for A/T selector lever “ P” posi-
tion) ON
MOTOR
RELAY
MON
Accelerator
pedal depressed
Vehicle stopped
Engine running
Brake pedal
depressed 4WD shift switch: 2WD OFF
4WD shift switch: AUTO or
4LO (A/T selector lever
“P ” or
“ N ” position) OFF
("ON" for
approx. 2 sec.
after shifting to
“
P ” and “ N”.)
4WD shift switch: AUTO or
4LO (Except for A/T selector
lever “P ” or “N ” position) ON
4WD shift switch: 4H (A/T
selector lever “P ” position) OFF
("ON" for
approx. 2 sec.
after shifting to
“
P ”.)
4WD shift switch: 4H (Except
for A/T selector lever “ P” posi-
tion) ON
SDIA2734E
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TF-98
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
2. Check voltage between transfer control unit harness connector
terminal and ground.
OK or NG
OK >> GO TO 7.
NG >> GO TO 2.
Connector Terminal ConditionVoltage (Approx.)
E142 14 -
Ground
Accelera-
tor pedal
depressed
Ve h ic le
stopped
Engine
running
Brake
pedal
depressed 4WD shift switch:
2WD
Battery voltage
4WD shift switch:
AUTO or 4LO (A/T
selector lever “P ” or
“ N ” position) Battery voltage
(0V for approx. 2
sec. after shifting
to
“P ” and “ N”.)
4WD shift switch:
AUTO or 4LO
(Except for A/T
selector lever “P ” or
“ N ” position) 0V
4WD shift switch:
4H (A/T selector
lever “P ” position) Battery voltage
(0V for approx. 2
sec. after shifting
to
“P ”.)
4WD shift switch:
4H (Except for A/T
selector lever “P ”
position) 0V
E143 41 -
Ground
Accelera-
tor pedal
depressed
Ve h ic le
stopped
Engine
running
Brake
pedal
depressed 4WD shift switch:
2WD
0V
4WD shift switch:
AUTO or 4LO (A/T
selector lever “P ” or
“ N ” position) 0V
(Battery voltage
for approx. 2 sec.
after shifting to
“
P ” and “N ”.)
4WD shift switch:
AUTO or 4LO
(Except for A/T
selector lever “P ” or
“ N ” position) Battery voltage
4WD shift switch:
4H (A/T selector
lever “P ” position) 0V
(Battery voltage
for approx. 2 sec.
after shifting to
“
P ”.)
4WD shift switch:
4H (Except for A/T
selector lever “P ”
position) Battery voltage
SDIA2735E
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TROUBLE DIAGNOSIS FOR SYSTEMTF-99
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Revision: November 2009 2006 QX56
2. CHECK TRANSFER MOTOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Connect transfer control unit harness connector.
3. Disconnect transfer motor relay.
4. Check voltage between transfer motor relay harness connector terminals and ground.
5. Turn ignition switch “ON”. (Do not start engine.)
6. Check voltage between transfer motor relay harness connector terminals and ground.
OK or NG
OK >> GO TO 3.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.
20A fuse No. 58 located in the fuse and relay box. Refer to PG-4, "POWER SUPPLY ROUTING
CIRCUIT" .
10A fuse No. 26 located in the fuse and fusible link box. Refer to PG-4, "POWER SUPPLY
ROUTING CIRCUIT"
Harness for short or open between battery and transfer motor relay harness connector E154
terminal 5.
Harness for short or open between transfer shut off relay harness connector E69 terminal 5
and transfer motor relay harness connector E153 terminal 2.
Battery and ignition switch. Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT" .
3. CHECK TRANSFER MOTOR RELAY
1. Turn ignition switch “OFF”.
2. Remove transfer motor relay. Refer to TF-22, "
Location of Electrical Parts" .
3. Apply 12V direct current between transfer motor relay terminals 1 and 2.
4. Check continuity between relay terminals 3 and 5.
OK or NG
OK >> GO TO 4.
NG >> Replace the transfer motor relay.
Connector Terminal Voltage (Approx.)
E153 2 - Ground 0V
E154 5 - Ground Battery voltage
WDIA0169E
ConnectorTerminal Voltage (Approx.)
E153 2 - Ground
Battery voltage
E154 5 - Ground
WDIA0170E
Condition Continuity
12V direct current supply between terminals 1 and 2 Yes
OFF No
LDIA0098E
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TF-100
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
4. CHECK TRANSFER MOTOR CONTROL CIRCUIT
1. Turn ignition switch “ OFF”. (Stay for at least 5 seconds.)
2. Remove transfer motor relay. Refer to TF-22, "
Location of Electrical Parts" .
3. Disconnect transfer control unit harness connector and transfer motor.
4. Check continuity between the following terminals.
–Transfer control unit harness connector E142 terminal 14 and
transfer motor relay harness connector E153 terminal 1.
–Transfer control unit harness connector E142 terminal 41 and
transfer motor relay harness connector E154 terminal 3.
–Transfer control unit harness connector E142 terminal 41 and
transfer motor harness connector F57 terminal 14.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5. CHECK TRANSFER MOTOR GROUND CIRCUIT
1. Turn ignition switch “ OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer motor harness connector.
3. Check continuity between transfer motor harness connector F57 terminal 15 and ground.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
SDIA2738E
Continuity should exist.
WDIA0143E
Continuity should exist.
SDIA2740E
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Revision: November 2009 2006 QX56
6. CHECK TRANSFER MOTOR
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer motor harness connector.
3. Apply 12V direct current between transfer motor terminals 14 and 15.
Does transfer motor operate?
YES >> GO TO 7.
NO >> Replace transfer motor. Refer to TF-142, "
Removal and
Installation" .
7. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-54, "
TRANSFER CONTROL UNIT TERMINALS
AND REFERENCE VALUE" .
OK or NG
OK >> GO TO 8.
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.
8. 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 to TF-132, "
Removal and Installation" .
LDIA0097E
Page 3207 of 3383
TF-102
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
COMPONENT INSPECTION
Transfer Motor Relay
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove transfer motor relay. Refer to TF-22, "
Location of Electrical Parts" .
3. Apply 12V direct current between transfer motor relay terminals 1 and 2.
4. Check continuity between relay terminals 3 and 5.
5. If NG, replace transfer motor relay. Refer to TF-22, "
Location of
Electrical Parts" .
Transfer Motor
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Remove transfer motor. Refer to TF-142, "
Removal and Installation" .
3. Apply 12V direct current between transfer motor terminals 14 and 15.
4. If transfer motor does not operate, replace transfer motor. Refer to TF-142, "
Removal and Installation" .
Transfer Fluid TemperatureEDS002IJ
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. Condition
Continuity
12V direct current supply between terminals 1 and 2 Yes
OFF No
LDIA0098E
LDIA0097E
Monitored item [Unit]Content ConditionDisplay value
(Approx.)
FLUID TEMP SE [V] Condition of transfer fluid
temperature Transfer fluid temperature approx. 20 - 80
°C (68 -
176° F) 1.1 - 0.3V
Te r m i n a lWire
color Item
ConditionData (Approx.)
28 B/G Sensor ground Always0V
31 G Transfer fluid temperature
sensor
Ignition switch: ONTransfer fluid temperature approx. 20°C
(68
°F) 1.1V
Transfer fluid temperature approx. 80°C
(176 °F) 0.3V
Page 3208 of 3383
TROUBLE DIAGNOSIS FOR SYSTEMTF-103
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Revision: November 2009 2006 QX56
DIAGNOSTIC PROCEDURE
1. CHECK TRANSFER FLUID TEMPERATURE SENSOR 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 “FLUID TEMP SE”.
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector terminals and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER TERMINAL CORD
ASSEMBLY 1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and transfer terminal cord assembly harness connec- tor.
3. Check continuity between the following terminals.
–Transfer control unit harness connector E143 terminal 28 and
transfer terminal cord assembly harness connector F56 terminal
3.
–Transfer control unit harness connector E143 terminal 31 and
transfer terminal cord assembly harness connector F56 terminal
2.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
Condition Display value
(Approx.)
Transfer fluid temperature approx. 20 - 80 °C (68 - 176°F) 1.1 - 0.3V
SDIA2741E
Connector Terminal ConditionData
(Approx.)
E143 28 -
Ground Always
0V
31 -
Ground Ignition switch:
ON Transfer fluid temperature
approx. 20
°C (68°F) 1.1V
Transfer fluid temperature
approx. 80 °C (176°F) 0.3V
SDIA2742E
Continuity should exist.
SDIA2743E
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TF-104
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
3. CHECK TRANSFER FLUID TEMPERATURE SENSOR
1. Turn ignition switch “ OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer terminal cord assembly harness connector.
3. Check resistance between transfer terminal cord assembly ter- minals 2 and 3.
OK or NG
OK >> GO TO 4.
NG >> Replace transfer fluid temperature sensor. Refer to TF-
22, "Location of Electrical Parts" .
4. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-54, "
TRANSFER CONTROL UNIT TERMINALS
AND REFERENCE VALUE" .
OK or NG
OK >> GO TO 5.
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.
5. 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 to TF-132, "
Removal and Installation" .
COMPONENT INSPECTION
1. Turn ignition switch “OFF ”. (Stay for at least 5 seconds.)
2. Disconnect transfer terminal cord assembly harness connector.
3. Check resistance between transfer terminal cord assembly har- ness connector F56 terminals 2 and 3.
4. If NG, replace the transfer fluid temperature sensor. Refer to TF-
22, "Location of Electrical Parts" .
Temperature °C (°F) Resistance (Approx.)
20 (68) 2.5 k\b
80 (176) 0.3 k\b
WDIA0188E
Temperature °C (°F) Resistance (Approx.)
20 (68) 2.5 k\b
80 (176) 0.3 k\b
WDIA0188E
Page 3210 of 3383
TROUBLE DIAGNOSIS FOR SYSTEMTF-105
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Revision: November 2009 2006 QX56
Clutch Pressure SwitchEDS002IK
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 [Unit]
Content ConditionDisplay value
CL PRES SW [ON /
OFF] Condition of clutch pres-
sure switch
Vehicle stopped
Engine running
A/T selector lever “
D” position
4WD shift switch: AUTO or 4H ( “Wait ” function is not
operating.) ON
Vehicle stopped
Engine running
4WD shift switch: 2WD (
“Wait ” function is not oper-
ating.) OFF
Terminal
Wire
color Item
ConditionData (Approx.)
34 BR Clutch pressure switch
Vehicle stopped
Engine running
A/T selector
lever “D ” position 4WD shift switch: AUTO or 4H (
“Wait ”
function is not operating.) 0V
Vehicle stopped
Engine running4WD shift switch: 2WD (
“Wait ” function is
not operating.) Battery voltage