2006 INFINITI QX56 4WD
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TROUBLE DIAGNOSIS FOR SYSTEMTF-71
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Revision: November 2009 2006 QX56
DIAGNOSTIC PROCEDURE
1. CHECK ACTUATOR MOTOR 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 “SHIFT ACT1”, “SHIFT AC MON1 ”,
“SHIFT ACT2 ” and “SHIFT AC MON2 ”.
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector terminal and ground.
Monitored
item Condition Display
value
SHIFT ACT1
Vehicle stopped
Engine running
A/T selector lever “N ” posi-
tion
Brake pedal depressed 4WD shift switch: 4H
to 4LO (
“Wait ” func-
tion is operating.) ON
Except the above OFF
SHIFT AC
MON1
Vehicle stopped
Engine running
A/T selector lever “N ” posi-
tion
Brake pedal depressed 4WD shift switch: 4H
to 4LO (
“Wait ” func-
tion is operating.) ON
Except the above OFF
SHIFT ACT2
Vehicle stopped
Engine running
A/T selector lever “N ” posi-
tion
Brake pedal depressed 4WD shift switch:
4LO to 4H (
“Wait ”
function is operat-
ing.) ON
Except the above OFF
SHIFT AC
MON2
Vehicle stopped
Engine running
A/T selector lever “N ” posi-
tion
Brake pedal depressed 4WD shift switch:
4LO to 4H (
“Wait ”
function is operat-
ing.) ON
Except the above OFF
Connector Terminal ConditionVoltage
(Approx.)
E142 4 -
Ground
Vehicle stopped
Engine running
A/T selector lever
“ N ” position
Brake pedal
depressed 4WD shift switch: 4H
to 4LO (
“Wait ” function
is operating.) Battery
voltage
Except the above 0V
13 -
Ground
Vehicle stopped
Engine running
A/T selector lever
“ N ” position
Brake pedal
depressed 4WD shift switch: 4LO
to 4H (
“Wait ” function
is operating.) Battery
voltage
Except the above 0V
PDIA0223E
SDIA2705E
Page 3177 of 3383
TF-72
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
OK or NG
OK >> GO TO 7.
NG >> GO TO 2.
2. CHECK ACTUATOR MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “ OFF”. (Stay for at least 5 seconds.)
2. Remove transfer shift high relay and transfer shift low relay.
3. Check voltage between transfer shift high relay harness connec- tor E46 terminal 5 (A), transfer shift low relay harness connector
E47 terminal 5 (B) and ground.
4. Turn ignition switch “ ON”. (Do not start engine.)
5. Check voltage between transfer shift high relay harness connec- tor E46 terminal 5 (A), transfer shift low relay harness connector
E47 terminal 5 (B) 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. 57, located in the fuse block (J/B)]. Refer to PG-4, "POWER SUPPLY ROUTING
CIRCUIT" .
Harness for short or open between battery, transfer shift high relay harness connector terminal
5 and transfer shift low relay harness connector terminal 5.
E14333 -
Ground
Vehicle stopped
Engine running
A/T selector lever
“ N ” position
Brake pedal
depressed 4WD shift switch: 4H
to 4LO (
“Wait ” function
is operating.) Battery
voltage
Except the above 0V
42 -
Ground
Vehicle stopped
Engine running
A/T selector lever
“ N ” position
Brake pedal
depressed 4WD shift switch: 4LO
to 4H (
“Wait ” function
is operating.) Battery
voltage
Except the above 0V
Connector Terminal
ConditionVoltage
(Approx.)
Connector Terminal Voltage (Approx.)
E46 5 - Ground
Battery voltage
E47 5 - Ground
WDIA0310E
Connector Terminal Voltage (Approx.)
E46 5 - Ground
Battery voltage
E47 5 - Ground
WDIA0311E
Page 3182 of 3383
TROUBLE DIAGNOSIS FOR SYSTEMTF-77
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Revision: November 2009 2006 QX56
Actuator Position SwitchEDS002ID
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
SHIFT POS SW1 [ON/
OFF] Condition of actuator posi-
tion switch 1
(Low)
Vehicle stopped
Engine running
A/T selector lever “
N”
position
Brake pedal depressed 4WD shift switch: 4LO
ON
4WD shift switch: 2WD,
AUTO or 4H OFF
SHIFT POS SW2 [ON/
OFF] Condition of actuator posi-
tion switch 2
(High)
Vehicle stopped
Engine running
A/T selector lever “
N”
position
Brake pedal depressed 4WD shift switch: 4H,
AUTO or 2WD
ON
4WD shift switch: 4LO OFF
Terminal Wire
color Item
ConditionData (Approx.)
27 W/L Actuator position switch 2
(High)
Vehicle stopped
Engine running
A/T selector
lever
“N ” position
Brake pedal
depressed 4WD shift switch: 4H, AUTO or 2WD 0V
4WD shift switch: 4LO
Battery voltage
44 LG/B Actuator position switch 1
(Low)
Vehicle stopped
Engine running
A/T selector
lever
“N ” position
Brake pedal
depressed 4WD shift switch: 4LO
0V
4WD shift switch: 2WD, AUTO or 4H Battery voltage
Page 3183 of 3383
TF-78
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
DIAGNOSTIC PROCEDURE
1. CHECK ACTUATOR 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 “SHIFT POS SW1” and “SHIFT POS
SW2 ”.
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.
Monitored item ConditionDisplay value
SHIFT POS SW1
Vehicle stopped
Engine running
A/T selector lever
“ N ” position
Brake pedal
depressed 4WD shift switch: 4LO ON
4WD shift switch:
2WD, AUTO or 4H
OFF
SHIFT POS SW2
Vehicle stopped
Engine running
A/T selector lever
“ N ” position
Brake pedal
depressed 4WD shift switch: 4H,
AUTO or 2WD
ON
4WD shift switch: 4LO OFF
Connector Terminal ConditionVoltage
(Approx.)
E143 27 -
Ground
Vehicle stopped
Engine running
A/T selector
lever “N ” position
Brake pedal
depressed 4WD shift switch: 4H,
AUTO or 2WD
0V
4WD shift switch: 4LO Battery
voltage
44 -
Ground
Vehicle stopped
Engine running
A/T selector
lever “N ” position
Brake pedal
depressed 4WD shift switch: 4LO 0V
4WD shift switch:
2WD, AUTO or 4H
Battery
voltage
SDIA2714E
SDIA2715E
Page 3186 of 3383
TROUBLE DIAGNOSIS FOR SYSTEMTF-81
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Revision: November 2009 2006 QX56
Transfer Control DeviceEDS003B3
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 Condition Display value
SHIFT AC MON1 [ON/
OFF] Check signal for transfer
control unit signal output
Vehicle stopped
Engine running
A/T selector lever “
N”
position
Brake pedal depressed 4WD shift switch: 4H to
4LO (
“Wait ” function is
operating.) ON
Except the above OFF
SHIFT AC MON2 [ON/
OFF] Check signal for transfer
control unit signal output
Vehicle stopped
Engine running
A/T selector lever “
N”
position
Brake pedal depressed 4WD shift switch: 4LO to
4H (
“Wait ” function is
operating.) ON
Except the above OFF
TerminalWire
color Item
ConditionData (Approx.)
16 Y/R Power supply Ignition switch: ON
Battery voltage
Ignition switch: OFF 0V
22 Y/R Power supply Ignition switch: ON
Battery voltage
Ignition switch: OFF 0V
30 SB Shut off relay Ignition switch: ON
0V
Ignition switch: OFF Battery voltage
33 R/L Transfer shift high relay moni-
tor
Vehicle stopped
Engine running
A/T selector
lever
“N ” position
Brake pedal
depressed 4WD shift switch: 4H to 4LO (
“Wait ” func-
tion is operating.) Battery voltage
Except the above 0V
42 P/G Transfer shift low relay moni-
tor
Vehicle stopped
Engine running
A/T selector
lever
“N ” position
Brake pedal
depressed 4WD shift switch: 4LO to 4H (
“Wait ” func-
tion is operating.) Battery voltage
Except the above 0V
Page 3190 of 3383
TROUBLE DIAGNOSIS FOR SYSTEMTF-85
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Revision: November 2009 2006 QX56
7. 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
“SHIFT ACT CIR [P1819]” displayed?
YES >> Replace transfer control unit. Refer to TF-132, "Removal and Installation" .
NO >> Inspection End.
8. PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-II)
Without CONSULT-II
1. Perform the self-diagnosis and then erase self-diagnostic results. Refer to TF-50, "
SELF-DIAGNOSTIC
PROCEDURE (WITHOUT CONSULT-II)" and TF-53, "ERASE SELF-DIAGNOSIS" .
2. Perform the self-diagnosis again.
Do the self-diagnostic results indicate transfer control device?
YES >> Replace transfer control unit. Refer to TF-132, "Removal and Installation" .
NO >> Inspection End.
Engine Speed Signal (ECM)EDS002IF
DIAGNOSTIC PROCEDURE
1. CHECK DTC WITH ECM
Perform self-diagnosis with ECM. Refer to EC-118, "
SELF-DIAG RESULTS 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 to TF-35, "
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 ECM again. Refer to EC-118, "
SELF-DIAG RESULTS MODE" .
Page 3191 of 3383
TF-86
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
Clutch Pressure SolenoidEDS002IG
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 ConditionDisplay value
DUTY SOLENOID [%] Condition of clutch pres-
sure solenoid
Vehicle stopped
Engine running
A/T selector lever
“N ”
position
Brake pedal depressed 4WD shift switch: 2WD
4%
4WD shift switch: AUTO 96 - 4%
4WD shift switch: 4H or
4LO 4%
Te r m i n a lWire
color Item
ConditionData (Approx.)
10 L/W Transfer dropping resistor
Vehicle stopped
Engine running
A/T selector
lever “N ” position
Brake pedal
depressed 4WD shift switch: AUTO
4 - 14V
4WD shift switch: 2WD, 4H or 4LO Less than 1V
19 L Clutch pressure solenoid
valve
Vehicle stopped
Engine running
A/T selector
lever
“N ” position
Brake pedal
depressed 4WD shift switch: AUTO
1.5 - 3V
4WD shift switch: 2WD, 4H or 4LO Less than 1V
Page 3192 of 3383
TROUBLE DIAGNOSIS FOR SYSTEMTF-87
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Revision: November 2009 2006 QX56
DIAGNOSTIC PROCEDURE
1. CHECK CLUTCH PRESSURE 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 “DUTY SOLENOID”.
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector terminal and ground.
OK or NG
OK >> GO TO 7.
NG >> GO TO 2.
Condition Display value
Vehicle stopped
Engine running
A/T selector lever “N” position
Brake pedal depressed 4WD shift switch: 2WD 4%
4WD shift switch: AUTO 96 - 4%
4WD shift switch: 4H or
4LO
4%
SDIA2718E
Connector Terminal
ConditionVoltage
(Approx.)
E142 10 -
Ground
Vehicle stopped
Engine running
A/T selector lever
“ N ” position
Brake pedal
depressed 4WD shift switch:
AUTO
4 - 14V
4WD shift switch:
2WD, 4H or 4LO Less
than 1V
19 -
Ground
Vehicle stopped
Engine running
A/T selector lever
“ N ” position
Brake pedal
depressed 4WD shift switch:
AUTO
1.5 - 3V
4WD shift switch:
2WD, 4H or 4LO Less
than 1V
SDIA2719E