INFINITI QX56 2008 Factory Service Manual

TM-94
< COMPONENT DIAGNOSIS >
CLOSED THROTTLE POSITION AND WIDE OPEN THROTTLE POSITION CIR-
CUIT
CLOSED THROTTLE POSITION AND WIDE OPEN THROTTLE POSITION
CIRCUIT
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001604161
Diagnosis ProcedureINFOID:0000000001604162
1.CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to TM-32, "
CONSULT-III Function (TRANSMISSION)".
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to TM-38.
NO >> GO TO 2.
2.CHECK THROTTLE POSI TION SIGNAL CIRCUIT
With CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “ECU INPUT SIGNALS” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
3. Depress accelerator pedal and read out the value of “CLSD THL POS” and “W/O THL POS”.
OK or NG
OK >> INSPECTION END
NG >> Check the following items. If NG, repair or replace damaged parts. • Perform the self-diagnosis for “ENGINE” with CONSULT-III.
• Open circuit or short to ground or shor t to power in harness or connectors.
• Pin terminals for damage or loos e connection with harness connector.
Item nameCondition Display value
CLSD THL POS Released accelerator pedal.
ON
Fully depressed accelerator pedal. OFF
W/O THL POS Fully depressed accelerator pedal.
ON
Released accelerator pedal. OFF
Accelerator Pedal OperationMonitor Item
CLSD THL POS W/O THL POS
Released ONOFF
Fully depressed OFFON
Revision: March 2010 2008 QX56

BRAKE SIGNAL CIRCUITTM-95
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
BRAKE SIGNAL CIRCUIT
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001604163
Diagnosis ProcedureINFOID:0000000001604164
1.CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to TM-32, "
CONSULT-III Function (TRANSMISSION)".
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to TM-38, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK STOP LAMP SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “ECU INPUT SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Read out ON/OFF switching action of the “BRAKE SW”.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3.CHECK STOP LAMP SWITCH
Check continuity between stop lamp switch terminals 1 and 2.
Check stop lamp switch after adjusting brake pedal — refer to
BR-15, "
Inspection and Adjustment".
OK or NG
OK >> Check stop lamp switch circuit.
NG >> Repair or replace stop lamp switch.
Item name Condition Display value
BRAKE SW Depressed brake pedal.
ON
Released brake pedal. OFF
ConditionContinuity
When brake pedal is depressed Yes
When brake pedal is released No
AWDIA0165ZZ
Revision: March 2010 2008 QX56

TM-96
< COMPONENT DIAGNOSIS >
TOW MODE SWITCH
TOW MODE SWITCH
DescriptionINFOID:0000000001604165
When tow mode switch is “ON”, tow mode switch signals are sent to TCM from combination meter by CAN
communication line.Then it`s a tow mode condition.
Diagnosis ProcedureINFOID:0000000001604167
1.CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to TM-32, "
CONSULT-III Function (TRANSMISSION)".
Is any malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to TM-38.
NO >> GO TO 2.
2.CHECK POWER SOURCE
1. Turn ignition switch “ON”. (Do not start engine.)
2. Check the voltage between tow mode switch connector M258 terminal 1 and ground.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3.CHECK TOW MODE SWITCH
1. Turn ignition switch “OFF”.
2. Disconnect tow mode switch connector.
3. Check continuity between tow mode switch terminals 1 and 2.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace tow mode switch.
4.DETECT MALFUNCTIONING ITEM
Check the following items. If any items are damaged, repair or replace damaged parts.
• Harness for short or open between combination meter connector terminal 35 and tow mode switch connec- tor terminal 1.
• Harness for short or open between tow mode switch connector terminal 2 and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5.CHECK COMBINATION METER
Check the combination meter. Refer to MWI-4, "
Work Flow".
OK or NG
OK >> INSPECTION END
NO >> Repair or replace damaged parts.
Condition To w m o d e
switch Data (Approx.)
When ignition switch is turned to “ON” ON
0V
OFF Battery voltage
SCIA5156E
Condition Continuity
Tow mode switch “ON” Yes
Tow mode switch “OFF” No
SCIA5584E
Revision: March 2010 2008 QX56

A/T SHIFT LOCK SYSTEMTM-97
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
A/T SHIFT LOCK SYSTEM
Wiring Diagram - A/ T Shift Lock SystemINFOID:0000000001696153
ABDWA0334GB
Revision: March 2010 2008 QX56

TM-98
< COMPONENT DIAGNOSIS >
A/T SHIFT LOCK SYSTEM
AADIA0077GB
Revision: March 20102008 QX56

A/T SHIFT LOCK SYSTEMTM-99
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
ABDIA0628GB
Revision: March 2010 2008 QX56

TM-100
< COMPONENT DIAGNOSIS >
A/T SHIFT LOCK SYSTEM
Terminals And Reference Values
INFOID:0000000001604171
SHIFT LOCK HARNESS CONNECTOR TERMINALS LAYOUT
SHIFT LOCK CONTROL UNIT INSPECTION TABLE
Data are reference values.
NOTE:
Confirm that the pointer swings only momentarily because the output time is so short. If the inspection is done with an oscillo scope, it
should be observed that the power source voltage lasts for 3.5 to 10 ms.
Component DescriptionINFOID:0000000001604172
SHIFT LOCK SOLENOID
AWDIA0043ZZ
TER-
MINAL NO. WIRE
COLOR ITEM
CONDITION VOLTAGE
(Approx.)
1Y/RPower source Ignition switch: “ON”
Battery voltage
Ignition switch: “OFF” Battery voltage
2 L/R Detent switch (key) Selector lever in “P” position
0V
Except above with ignition knob switch in “PUSHED” or “ON”
position Battery voltage
3GRDetent switch Selector lever in “P” position
0V
Except above Battery voltage
4 R/G Stop lamp switch Brake pedal applied
Battery voltage
Brake pedal released 0V
5 W/R Vehicle speed signal ——
6 G/R Ignition signal Ignition switch: “ON”
Battery voltage
Ignition switch: “OFF” 0V
7 R/W Shift lock solenoid Brake pedal applied with ignition knob switch in “ON” position 0V
Except above
Battery voltage
8 B Ground ——
9 R Key lock solenoid Selector lever in any position except “P”, and ignition knob
switch turned from “ON” to “OFF”
Battery voltage for ap-
prox. 0.1 sec. (Note)
Except above 0V
10 W/G Key unlock solenoid Ignition knob switch in “PUSHED” position.
Battery voltage for ap-
prox. 0.1 sec. (Note)
Except above 0V
Revision: March 2010 2008 QX56

A/T SHIFT LOCK SYSTEMTM-101
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
• Check operation by applying battery voltage to A/T shift selector terminal 9 and ground to terminal 10.
CAUTION:
Be sure to apply the voltage of the correct polarity to the
respective terminals. Otherwise, the part may be damaged.
DETENT SWITCH (KEY)
• Check continuity between terminals of the A/T shift selector.
DETENT SWITCH
• Check continuity between terminals of the A/T shift selector.
KEY LOCK SOLENOID
Key lock
• Check operation by applying battery voltage to key switch and igni-
tion knob switch terminal 6 and ground to terminal 5.
CAUTION:
Be careful not to cause burnout of the component.
Key unlock
AWDIA0700ZZ
Condition Terminal No. Continuity
When selector lever is “P” position. 5 - 6No
When selector lever is not “P” position. Yes
AWDIA0567ZZ
ConditionTerminal No. Continuity
When selector lever is “P” position. 3 - 4No
When selector lever is not “P” position. Yes
AWDIA0568ZZ
AWDIA0544ZZ
Revision: March 2010 2008 QX56

TM-102
< COMPONENT DIAGNOSIS >
A/T SHIFT LOCK SYSTEM
• Check operation by applying battery voltage to key switch and igni-tion knob switch terminal 5 and ground to terminal 6.
CAUTION:
Be careful not to cause burnout of the component.
IGNITION KNOB SWITCH
• Check continuity between terminals of the key switch and ignition
knob switch.
STOP LAMP SWITCH
• Check continuity between stop lamp switch terminals 1 and 2.
Check stop lamp switch after adjusting brake pedal.
AWDIA0545ZZ
Condition Terminal No. Continuity
Switch pushed 1 - 2Ye s
Switch released No
AWDIA0546ZZ
ConditionTerminal No. Continuity
When brake pedal is depressed 1 -2Ye s
When brake pedal is released No
AWDIA0165ZZ
Revision: March 2010 2008 QX56

TCM
TM-103
< ECU DIAGNOSIS >
C EF
G H
I
J
K L
M A
B
TM
N
O P
ECU DIAGNOSIS
TCM
Reference ValueINFOID:0000000001604173
REFERENCE VALUES
NOTICE:
1. The CONSULT-III electrically displays shift timi ng and lock-up timing (that is, operation timing of each
solenoid).
Check for time difference between actual shift timi ng and the CONSULT-III display. If the difference is
noticeable, mechanical parts (except solenoids, sens ors, etc.) may be malfunctioning. Check mechanical
parts using applicable diagnostic procedures.
2. Shift schedule (which implies gear position) display ed on CONSULT-III and that indicated in Service Man-
ual may differ slightly. This occurs because of the following reasons:
- Actual shift schedule has more or less tolerance or allowance,
- Shift schedule indicated in Service Manual re fers to the point where shifts start, and
- Gear position displayed on CONSULT-III indicates the point where shifts are completed.
3. Display of solenoid valves on CONSULT-III changes at the start of shifting, while gear position is displayed upon completion of shifting (which is computed by TCM).
Item name Condition Display value (Approx.)
ATF TEMP SE 1 0°C (32 ° F) - 20 °C (68 °F) - 80 °C (176 °F) 3.3 - 2.7 - 0.9 V
ATF TEMP SE 2 3.3 - 2.5 - 0.7 V
TCC SOLENOID When perform slip lock-up
0.2 - 0.4 A
When perform lock-up 0.4 - 0.6 A
SLCT LVR POSI Selector lever in
“N”,“P” position. N/P
Selector lever in “R” position. R
Selector lever in “D” position. D
Selector lever in “4” position. 4
Selector lever in “3” position. 3
Selector lever in “2” position. 2
Selector lever in “1” position. 1
VHCL/S SE·A/T During driving Approximately matches the
speedometer reading.
ENGINE SPEED Engine running Closely matches the tachometer
reading.
LINE PRES SOL During driving 0.2 - 0.6 A
INPUT SPEED During driving (lock-up ON) Approximately matches the en-
gine speed.
VHCL/S SE·MTR During driving Approximately matches the
speedometer reading.
ATF PRES SW 2 Low coast brake engaged. Refer to
TM-9
ON
Low coast brake disengaged. Refer to TM-9
OFF
I/C SOLENOID Input clutch disengaged. Refer to
TM-9
0.6 - 0.8 A
Input clutch engaged. Refer to TM-9
0 - 0.05 A
FR/B SOLENOID Front brake engaged. Refer to
TM-9
0.6 - 0.8 A
Front brake disengaged. Refer to TM-9
0 - 0.05 A
D/C SOLENOID Direct clutch disengaged. Refer to
TM-9
0.6 - 0.8 A
Direct clutch engaged. Refer to TM-9
0 - 0.05 A
HLR/C SOL High and low reverse clutch disengaged. Refer to
TM-9
0.6 - 0.8 A
High and low reverse clutch engaged. Refer to TM-9
0 - 0.05 A
Revision: March 2010 2008 QX56