INFINITI QX56 2007 Factory Service Manual

TROUBLE DIAGNOSIS
AT-81
< SERVICE INFORMATION >
D
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AT
N
O
P
60
OthersVehicle runs with
transmission in “N” po-
sition.
Refer to AT- 1 6 9 , "In
"N" Position, Vehicle
Moves".ON vehicle1. PNP switchAT- 9 9
2. Fluid level and stateAT- 5 1
3. Control cable adjustmentAT-208
4. Control valve with TCMAT-210
OFF vehicle5. Input clutchAT-262
6. Gear systemAT-228
7. Direct clutchAT-274
8. Reverse brakeAT-240
9. Forward one- way clutch (Parts behind drum support is im-
possible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT-240
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT-240
61Engine does not start
in “N” or “P” position.
Refer to AT- 1 6 8 , "En-
gine Cannot Be Start-
ed in "P" or "N"
Position".ON vehicle1. Ignition switch and starterPG-3
, SC-
9
2. Control cable adjustmentAT-208
3. PNP switchAT- 9 9
62Engine starts in posi-
tions other than “N” or
“P”.ON vehicle1. Ignition switch and starterPG-3
, SC-
9
2. Control cable adjustmentAT-208
3. PNP switchAT- 9 9
63 Engine stall.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT-109
3. Turbine revolution sensorAT-103
4. Torque converter clutch solenoid valveAT- 111
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT-210
OFF vehicle 7. Torque converterAT-240
64Engine stalls when se-
lect lever shifted “N” →
“D”, “R”.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT-109
3. Turbine revolution sensorAT-103
4. Torque converter clutch solenoid valveAT- 111
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT-210
OFF vehicle 7. Torque converterAT-240
No. Items Symptom Condition Diagnostic ItemReference
page

AT-82
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
TCM Input/Output Signal Reference Value
INFOID:0000000003532258
A/T ASSEMBLY HARNESS CONNECTOR TERMINAL LAYOUT
TERMINAL AND REFERENCE VALUES FOR TCM
Data are reference value and are measured between each terminal and ground.
65 OthersEngine speed does
not return to idle.
Refer to AT-191, "En-
gine Speed Does Not
Return to Idle".ON vehicle1. Fluid level and stateAT- 5 1
2. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 5 4,
AT- 1 3 8
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 0,
AT- 1 3 4
4. Accelerator pedal position sensorAT- 11 7
5. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT- 2 1 0
OFF vehicle8. Front brake (brake band)AT- 2 4 09. Direct clutchAT- 2 7 4
No. Items Symptom Condition Diagnostic ItemReference
page
SCIA1658E
Te r m i n a l
No.Wire
colorItem Condition Data (Pyrex.)
1PPower supply
(Memory back-up)Always Battery voltage
2PPower supply
(Memory back-up)Always Battery voltage
3 L CAN-H – –
4VK-line (CONSULT-
II signal)The terminal is connected to the data link connector for CONSULT-II. –
5 B Ground Always 0V
6Y/RPower supply– Battery voltage
–0V
7RBack-up lamp re-
laySelector lever in “R” position. 0V
Selector lever in other positions. Battery voltage
8 P CAN-L – –

TROUBLE DIAGNOSIS
AT-83
< SERVICE INFORMATION >
D
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PCONSULT-II Function (A/T)INFOID:0000000003532259
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II REFERENCE VALUE
NOTICE:
1. The CONSULT-II electrically displays shift timing and lock-up timing (that is, operation timing of each sole-
noid).
Check for time difference between actual shift timing and the CONSULT-II display. If the difference is
noticeable, mechanical parts (except solenoids, sensors, etc.) may be malfunctioning. Check mechanical
parts using applicable diagnostic procedures.
2. Shift schedule (which implies gear position) displayed on CONSULT-II 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 refers to the point where shifts start, and
- Gear position displayed on CONSULT-II indicates the point where shifts are completed.
3. Display of solenoid valves on CONSULT-II changes at the start of shifting, while gear position is displayed
upon completion of shifting (which is computed by TCM).
9 B/R Starter relaySelector lever in “N”,“ P” positions. Battery voltage
Selector lever in other positions. 0V
10 B Ground Always 0V Te r m i n a l
No.Wire
colorItem Condition Data (Pyrex.)
TCM diagnostic mode Description
WORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the TCM for setting the status
suitable for required operation, input/output signals are received from the TCM and received data is
displayed.
SELF-DIAG RESULTS Displays TCM self-diagnosis results.
DATA MONITOR Displays TCM input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
FUNCTION TEST Conducted by CONSULT-II instead of a technician to determine whether each system is “OK” or “NG”.
ECU PART NUMBER TCM part number can be read.
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 23.3 - 2.5 - 0.7 V
TCC SOLENOIDWhen perform slip lock-up 0.2 - 0.4 A
When perform lock-up 0.4 - 0.6 A
SLCT LVR POSISelector 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 drivingApproximately matches the
speedometer reading.
ENGINE SPEED Engine runningClosely matches the tachometer
reading.

AT-84
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure".
SELF-DIAGNOSTIC RESULT MODE
Operation Procedure
After performing SELF-DIAGNOSTIC RESULT MODE, place check marks for results on the AT-44, "How To
Perform Trouble Diagnosis for Quick and Accurate Repair". Reference pages are provided following the items.
Display Items List
LINE PRES SOL During driving 0.2 - 0.6 A
TURBINE REV During driving (lock-up ON)Approximately matches the en-
gine speed.
VHCL/S SE·MTR During drivingApproximately matches the
speedometer reading.
ATF PRES SW 1Front brake engaged. Refer to AT- 2 0
ON
Front brake disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 2Low coast brake engaged. Refer to AT- 2 0
ON
Low coast brake disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 3Input clutch engaged. Refer to AT- 2 0
ON
Input clutch disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 5Direct clutch engaged. Refer to AT- 2 0
ON
Direct clutch disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 6High and low reverse clutch engaged. Refer to AT- 2 0
ON
High and low reverse clutch disengaged. Refer to AT- 2 0
OFF
I/C SOLENOIDInput clutch disengaged. Refer to AT- 2 0
0.6 - 0.8 A
Input clutch engaged. Refer to AT- 2 0
0 - 0.05 A
FR/B SOLENOIDFront brake engaged. Refer to AT- 2 0
0.6 - 0.8 A
Front brake disengaged. Refer to AT- 2 0
0 - 0.05 A
D/C SOLENOIDDirect clutch disengaged. Refer to AT- 2 0
0.6 - 0.8 A
Direct clutch engaged. Refer to AT- 2 0
0 - 0.05 A
HLR/C SOLHigh and low reverse clutch disengaged. Refer to AT- 2 0
0.6 - 0.8 A
High and low reverse clutch engaged. Refer to AT- 2 0
0 - 0.05 A
ON OFF SOLLow coast brake engaged. Refer to AT- 2 0
ON
Low coast brake disengaged. Refer to AT- 2 0
OFF
STARTER RELAYSelector lever in “N”,“P” position. ON
Selector lever in other position. OFF
ACCELE POSIReleased accelerator pedal. 0.0/8
Fully depressed accelerator pedal. 8/8
CLSD THL POSReleased accelerator pedal. ON
Fully depressed accelerator pedal. OFF
W/O THL POSFully depressed accelerator pedal. ON
Released accelerator pedal. OFF
BRAKE SWDepressed brake pedal. ON
Released brake pedal. OFF Item name Condition Display value (Approx.)

TROUBLE DIAGNOSIS
AT-85
< SERVICE INFORMATION >
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AT
N
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X: Applicable, —: Not applicable
Items (CONSULT-II
screen terms)Malfunction is detected when...TCM self-di-
agnosisOBD-II (DTC)
“A/T” with
CONSULT-IIMIL indicator
lamp*1, “EN-
GINE” with
CONSULT-II or
GST
CAN COMM CIRCUIT • When a malfunction is detected in CAN communications U1000 U1000
STARTER RELAY/
CIRC• If this signal is ON other than in P or N position, this is judged to be a
malfunction.
(And if it is OFF in P or N position, this too is judged to be a malfunction.)P0615 —
TCM • TCM is malfunctioning. P0700 P0700
PNP SW/CIRC• PNP switch 1-4 signals input with impossible pattern
• “P” position is detected from N position without any other position being
detected in between.P0705 P0705
TURBINE REV S/CIRC• TCM does not receive the proper voltage signal from the sensor.
• TCM detects an irregularity only at position of 4th gear for turbine revo-
lution sensor 2.P0717 P0717
VEH SPD SEN/CIR AT
(Revolution sensor)• Signal from vehicle speed sensor A/T (Revolution sensor) not input due
to cut line or the like
• Unexpected signal input during running
• After ignition switch is turned ON, unexpected signal input from vehicle
speed sensor MTR before the vehicle starts movingP0720 P0720
ENGINE SPEED SIG • TCM does not receive the CAN communication signal from the ECM. P0725 —
TCC SOLENOID/CIRC • Normal voltage not applied to solenoid due to cut line, short, or the like P0740 P0740
A/T TCC S/V FNCTN• A/T cannot perform lock-up even if electrical circuit is good.
• TCM detects as irregular by comparing difference value with slip rota-
tion.P0744 P0744*2
L/PRESS SOL/CIRC• Normal voltage not applied to solenoid due to cut line, short, or the like
• TCM detects as irregular by comparing target value with monitor value.P0745 P0745
TP SEN/CIRC A/T• TCM does not receive the proper accelerator pedal position signals (in-
put by CAN communication) from ECM.P1705 P1705
ATF TEMP SEN/CIRC• During running, the ATF temperature sensor signal voltage is exces-
sively high or lowP1710 P0710
VEH SPD SE/CIR·MTR• Signal (CAN communication) from vehicle speed sensor MTR not input
due to cut line or the like
• Unexpected signal input during runningP1721 —
A/T INTERLOCK• Except during shift change, the gear position and ATF pressure switch
states are monitored and comparative judgement made.P1730 P1730
A/T 1ST E/BRAKING• Each ATF pressure switch and solenoid current is monitored and if a
pattern is detected having engine braking 1st gear other than in the "1"
position, a malfunction is detected.P1731 —
I/C SOLENOID/CIRC• Normal voltage not applied to solenoid due to functional malfunction,
cut line, short, or the like
• TCM detects as irregular by comparing target value with monitor value.P1752 P1752
I/C SOLENOID FNCTN • TCM detects that actual gear ratio is irregular, and relation between
gear position and condition of ATF pressure switch 3 is irregular during
depressing accelerator pedal. (Other than during shift change)
• TCM detects that relation between gear position and condition of ATF
pressure switch 3 is irregular during releasing accelerator pedal. (Other
than during shift change)P1754 P1754*2
FR/B SOLENOID/CIRC• Normal voltage not applied to solenoid due to functional malfunction,
cut line, short, or the like
• TCM detects as irregular by comparing target value with monitor value.P1757 P1757

AT-86
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
*1: Refer to EC-63, "Malfunction Indicator Lamp (MIL)".
*2:These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL.
DATA MONITOR MODE
Display Items List
FR/B SOLENOID FNCT• TCM detects that actual gear ratio is irregular, and relation between
gear position and condition of ATF pressure switch 1 is irregular during
depressing accelerator pedal. (Other than during shift change)
• TCM detects that relation between gear position and condition of ATF
pressure switch 1 is irregular during releasing accelerator pedal. (Other
than during shift change)P1759 P1759*2
D/C SOLENOID/CIRC• Normal voltage not applied to solenoid due to cut line, short, or the like
• TCM detects as irregular by comparing target value with monitor value.P1762 P1762
D/C SOLENOID
FNCTN• TCM detects that actual gear ratio is irregular, and relation between
gear position and condition of ATF pressure switch 5 is irregular during
depressing accelerator pedal. (Other than during shift change)
• TCM detects that relation between gear position and condition of ATF
pressure switch 5 is irregular during releasing accelerator pedal. (Other
than during shift change)P1764 P1764*2
HLR/C SOL/CIRC• Normal voltage not applied to solenoid due to functional malfunction,
cut line, short, or the like
• TCM detects as irregular by comparing target value with monitor value.P1767 P1767
HLR/C SOL FNCTN• TCM detects that actual gear ratio is irregular, and relation between
gear position and condition of ATF pressure switch 6 is irregular during
depressing accelerator pedal. (Other than during shift change)
• TCM detects that relation between gear position and condition of ATF
pressure switch 6 is irregular during releasing accelerator pedal. (Other
than during shift change)P1769 P1769*2
LC/B SOLENOID/CIRC• Normal voltage not applied to solenoid due to functional malfunction,
cut line, short, or the likeP1772 P1772
LC/B SOLENOID FNCT• TCM detects an improper voltage drop when it tries to operate the so-
lenoid valve.
• Condition of ATF pressure switch 2 is different from monitor value, and
relation between gear position and actual gear ratio is irregular.P1774 P1774*2
ATF PRES SW 1/CIRC• TCM detects that actual gear ratio is normal, and relation between gear
position and condition of ATF pressure switch 1 is irregular during de-
pressing accelerator pedal. (Other than during shift change)P1841 —
ATF PRES SW 3/CIRC• TCM detects that actual gear ratio is normal, and relation between gear
position and condition of ATF pressure switch 3 is irregular during de-
pressing accelerator pedal. (Other than during shift change)P1843 —
ATF PRES SW 5/CIRC• TCM detects that actual gear ratio is normal, and relation between gear
position and condition of ATF pressure switch 5 is irregular during de-
pressing accelerator pedal. (Other than during shift change)P1845 —
ATF PRES SW 6/CIRC• TCM detects that actual gear ratio is normal, and relation between gear
position and condition of ATF pressure switch 6 is irregular during de-
pressing accelerator pedal. (Other than during shift change)P1846 —
NO DTC IS DETECTED
FURTHER TESTING
MAY BE REQUIRED• No NG item has been detected. X X Items (CONSULT-II
screen terms)Malfunction is detected when...TCM self-di-
agnosisOBD-II (DTC)
“A/T” with
CONSULT-IIMIL indicator
lamp*1, “EN-
GINE” with
CONSULT-II or
GST

TROUBLE DIAGNOSIS
AT-87
< SERVICE INFORMATION >
D
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X: Standard, —: Not applicable
Monitored item (Unit)Monitor Item Selection
Remarks ECU IN-
PUT SIG-
NALSMAIN SIG-
NALSSELEC-
TION
FROM
MENU
VHCL/S SE·A/T (km/h) X X X Revolution sensor
VHCL/S SE·MTR (km/h) X — X
ACCELE POSI (0.0/8) X — X Accelerator pedal position signal
THROTTLE POSI (0.0/8) X X XDegree of opening for accelerator recognized by
the TCM
For fail-safe operation, the specific value used
for control is displayed.
CLSD THL POS (ON-OFF display) X — X
Signal input with CAN communications
W/O THL POS (ON-OFF display) X — X
BRAKE SW (ON-OFF display) X — X Stop lamp switch
GEAR — X XGear position recognized by the TCM updated
after gear-shifting
ENGINE SPEED (rpm) X X X
TURBINE REV (rpm) X X X
OUTPUT REV (rpm) X X X
GEAR RATIO — X X
TC SLIP SPEED (rpm) — X XDifference between engine speed and torque
converter input shaft speed
F SUN GR REV (rpm) — — X
F CARR GR REV (rpm) — — X
ATF TEMP SE 1 (V) X — X
ATF TEMP SE 2 (V) X — X
ATF TEMP 1 (°C) — X X
ATF TEMP 2 (°C) — X X
BATTERY VOLT (V) X — X
ATF PRES SW 1 (ON-OFF display) X X X (for FR/B solenoid)
ATF PRES SW 2 (ON-OFF display) X X X (for LC/B solenoid)
ATF PRES SW 3 (ON-OFF display) X X X (for I/C solenoid)
ATF PRES SW 5 (ON-OFF display) X X X (for D/C solenoid)
ATF PRES SW 6 (ON-OFF display) X X X (for HLR/C solenoid)
PNP SW 1 (ON-OFF display) X — X
PNP SW 2 (ON-OFF display) X — X
PNP SW 3 (ON-OFF display) X — X
PNP SW 4 (ON-OFF display) X — X
SLCT LVR POSI — X XSelector lever position is recognized by the TCM.
For fail-safe operation, the specific value used
for control is displayed.
1 POSITION SW (ON-OFF display) X — X 1st position switch
OD CONT SW (ON-OFF display) X — X 4th position switch

AT-88
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
POWERSHIFT SW (ON-OFF display) X — X
Not mounted but displayed. HOLD SW (ON-OFF display) X — X
MANU MODE SW (ON-OFF display) X — X
NON M-MODE SW (ON-OFF display) X — X
UP SW LEVER (ON-OFF display) X — X
DOWN SW LEVER (ON-OFF display) X — X
SFT UP ST SW (ON-OFF display) — — X
SFT DWN ST SW (ON-OFF display) — — X
ASCD-OD CUT (ON-OFF display) — — X
ASCD-CRUISE (ON-OFF display) — — X
ABS SIGNAL (ON-OFF display) — — X
ACC OD CUT (ON-OFF display) — — X
ICC (Intelligent cruise control)
ACC SIGNAL (ON-OFF display) — — X
TCS GR/P KEEP (ON-OFF display) — — X
TCS SIGNAL 2 (ON-OFF display) — — X
TCS SIGNAL 1 (ON-OFF display) — — X
TCC SOLENOID (A) — X X
LINE PRES SOL (A) — X X
I/C SOLENOID (A) — X X
FR/B SOLENOID (A) — X X
D/C SOLENOID (A) — X X
HLR/C SOL (A) — X X
ON OFF SOL (ON-OFF display) — — X LC/B solenoid
TCC SOL MON (A) — — X
L/P SOL MON (A) — — X
I/C SOL MON (A) — — X
FR/B SOL MON (A) — — X
D/C SOL MON (A) — — X
HLR/C SOL MON (A) — — X
ONOFF SOL MON (ON-OFF display) — — X LC/B solenoid
P POSI IND (ON-OFF display) — — X
R POSI IND (ON-OFF display) — — X
N POSI IND (ON-OFF display) — — X
D POSI IND (ON-OFF display) — — X
4TH POSI IND (ON-OFF display) — — X
3RD POSI IND (ON-OFF display) — — X
2ND POSI IND (ON-OFF display) — — X
1ST POSI IND (ON-OFF display) — — X
MANU MODE IND (ON-OFF display) — — X
Not mounted but displayed.
POWER M LAMP (ON-OFF display) — — X
F-SAFE IND/L (ON-OFF display) — — XMonitored item (Unit)Monitor Item Selection
Remarks ECU IN-
PUT SIG-
NALSMAIN SIG-
NALSSELEC-
TION
FROM
MENU

TROUBLE DIAGNOSIS
AT-89
< SERVICE INFORMATION >
D
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AT
N
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P
DTC WORK SUPPORT MODE
Display Items List
ATF WARN LAMP (ON-OFF display) — — X
BACK-UP LAMP (ON-OFF display) — — X
STARTER RELAY (ON-OFF display) — — X
PNP SW3 MON (ON-OFF display) — — X
C/V CLB ID1 — — X
C/V CLB ID2 — — X
C/V CLB ID3 — — X
UNIT CLB ID1 — — X
UNIT CLB ID2 — — X
UNIT CLB ID3 — — X
TRGT GR RATIO — — X
TRGT PRES TCC (kPa) — — X
TRGT PRES L/P (kPa) — — X
TRGT PRES I/C (kPa) — — X
TRGT PRE FR/B (kPa) — — X
TRGT PRES D/C (kPa) — — X
TRG PRE HLR/C (kPa) — — X
SHIFT PATTERN — — X
DRV CST JUDGE — — X
START RLY MON — — X
NEXT GR POSI — — X
SHIFT MODE — — X
MANU GR POSI — — X
VEHICLE SPEED (km/h) — XX Vehicle speed recognized by the TCM.
Voltage (V) — — XDisplays the value measured by the voltage
probe.
Frequency (Hz) — — X
The value measured by the pulse probe is dis-
played. DUTY-HI (high) (%) — — X
DUTY-LOW (low) (%) — — X
PLS WIDTH-HI (ms) — — X
PLS WIDTH-LOW (ms) — — XMonitored item (Unit)Monitor Item Selection
Remarks ECU IN-
PUT SIG-
NALSMAIN SIG-
NALSSELEC-
TION
FROM
MENU
DTC work support itemDescription Check item
I/C SOL FUNCTN CHECK* — —
FR/B SOL FUNCTN CHECK* — —
D/C SOL FUNCTN CHECK* — —
HLR/C SOL FUNCTN CHECK* — —

AT-90
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
*: Do not use, but displayed.LC/B SOL FUNCTN CHECK* — —
TCC SOL FUNCTN CHECKFollowing items for “TCC solenoid function (lock-up) ” can be con-
firmed.
• Self-diagnosis status (whether the diagnosis is being conducted
or not)
• Self-diagnosis result (OK or NG)• TCC solenoid valve
•Hydraulic control circuit DTC work support item Description Check item