display INFINITI QX56 2006 Factory Service Manual

TF-70
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
Actuator MotorEDS003B2
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
SHIFT ACT1 [ON/OFF] Output condition to
actuator motor (High)

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 MON1 [ON/OFF] Check signal for trans-
fer 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 ACT2 [ON/OFF] Output condition to
actuator motor (Low)

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
SHIFT AC MON2 [ON/OFF] Check signal for trans-
fer 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
Te r m i n a lWire
color Item
ConditionData (Approx.)
4 Y/L Transfer shift high relay

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
13 G/B Transfer shift low relay

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
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

TROUBLE DIAGNOSIS FOR SYSTEMTF-71
CE F
G H
I
J
K L
M A
B
TF
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

TROUBLE DIAGNOSIS FOR SYSTEMTF-77
CE F
G H
I
J
K L
M A
B
TF
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

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

TROUBLE DIAGNOSIS FOR SYSTEMTF-81
CE F
G H
I
J
K L
M A
B
TF
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

TROUBLE DIAGNOSIS FOR SYSTEMTF-85
CE F
G H
I
J
K L
M A
B
TF
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" .

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

TROUBLE DIAGNOSIS FOR SYSTEMTF-87
CE F
G H
I
J
K L
M A
B
TF
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

TROUBLE DIAGNOSIS FOR SYSTEMTF-91
CE F
G H
I
J
K L
M A
B
TF
Revision: November 2009 2006 QX56
2-4WD SolenoidEDS002IH
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.
DIAGNOSTIC PROCEDURE
1. CHECK 4WD SHIFT SWITCH SYSTEM
Perform self-diagnosis. Refer to TF-50, "
Self-diagnostic Procedure" .
Is the "4WD MOD SW [P1814]" (with CONSULT-II) or "Flickering pattern: 16 (without CONSULT-II) detected?
YES >> Perform trouble diagnosis for 4WD shift switch. Refer to TF-62, "4WD Shift Switch" .
NO >> GO TO 2.
Monitored item Content ConditionDisplay value
2-4WD SOL [ON/OFF] Condition of 2-4WD shift
solenoid valve

Vehicle stopped

Engine running

A/T selector lever “
N”
position

Brake pedal depressed 4WD shift switch: 2WD
OFF
4WD shift switch: AUTO ON
4WD shift switch: 4H
4WD shift switch: 4LO
4WD shift switch: AUTO
( “ Wait ” function is operat-
ing.) OFF
4WD shift switch: 4H
( “ Wait ” function is operat-
ing.) OFF
2-4WD SOL MON [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: 2WD
OFF
4WD shift switch: AUTO ON
4WD shift switch: 4H
4WD shift switch: 4LO
4WD shift switch: AUTO
( “ Wait ” function is operat-
ing.) OFF
4WD shift switch: 4H
( “ Wait ” function is operat-
ing.) OFF
Terminal
Wire
color Item
ConditionData (Approx.)
1 GR 2-4WD shift solenoid valve

Vehicle stopped

Engine running

A/T selector
lever “N ” position

Brake pedal
depressed 4WD shift switch: 2WD 0V
4WD shift switch: AUTO, 4H or 4LO Battery voltage

TF-92
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: November 20092006 QX56
2. CHECK 2-4WD SHIFT SOLENOID 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 “2-4WD SOL” and “2-4WD SOL MON ”.
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 3.
Monitored item Condition Display
value
2-4WD SOL

Vehicle stopped

Engine running

A/T selector lever “N ”
position

Brake pedal
depressed 4WD shift switch: 2WD OFF
4WD shift switch: AUTO
ON
4WD shift switch: 4H
4WD shift switch: 4LO
4WD shift switch: AUTO
( “Wait ” function is operat-
ing.) OFF
4WD shift switch: 4H ( “Wait ”
function is operating.) OFF
2-4WD SOL
MON

Vehicle stopped

Engine running

A/T selector lever “N ”
position

Brake pedal
depressed 4WD shift switch: 2WD OFF
4WD shift switch: AUTO
ON
4WD shift switch: 4H
4WD shift switch: 4LO
4WD shift switch: AUTO
( “Wait ” function is operat-
ing.) OFF
4WD shift switch: 4H ( “Wait ”
function is operating.) OFF
SDIA2727E
Connector Terminal
ConditionVoltage
(Approx.)
E142 1 -
Ground

Vehicle stopped

Engine running

A/T selector lever
“ N ” position

Brake pedal
depressed 4WD shift switch:
2WD
0V
4WD shift switch:
AUTO, 4H or 4LO Battery
voltage
SDIA2728E