engine INFINITI QX56 2004 Factory Repair Manual

TROUBLE DIAGNOSIS
AT-83
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: August 20072004 QX56
41
Slips/Will
Not
Engage While accelerating in
5th, engine races or
slippage occurs.ON vehicle1. Fluid level and stateAT- 5 8
2. Line pressure testAT- 5 9
3. Accelerator pedal position sensorAT- 1 2 9
4. CAN communication lineAT- 1 0 3
5. ATF pressure switch 1 and front brake solenoid valveAT- 1 7 5,
AT- 1 5 1
6. Control valve with TCMAT- 2 4 1
OFF vehicle7. Torque converterAT- 2 7 3
8. Oil pump assemblyAT- 2 9 0
9. Front brake (brake band)AT- 2 7 3
10. Input clutchAT- 2 9 5
11. Gear systemAT- 2 6 1
12. High and low reverse clutchAT- 3 0 5
42 Slips at lock-up.ON vehicle1. Fluid level and stateAT- 5 8
2. Line pressure testAT- 5 9
3. Engine speed signalAT- 11 5
4. Turbine revolution sensorAT- 1 3 4
5. Torque converter clutch solenoid valveAT- 11 8
6. CAN communication lineAT- 1 0 3
7. Control valve with TCMAT- 2 4 1
OFF vehicle8. Torque converterAT- 2 7 39. Oil pump assemblyAT- 2 9 0
43No creep at all.
Refer toAT- 1 9 8 , "
Vehi-
cle Does Not Creep
Backward In “R” Posi-
tion" , AT-201, "Ve hi-
cle Does Not Creep
Forward In “D” Posi-
tion"
ON vehicle1. Fluid level and stateAT- 5 8
2. Line pressure testAT- 5 9
3. Accelerator pedal position sensorAT- 1 2 9
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 8 1,
AT- 1 5 7
5. PNP switchAT- 1 0 9
6. CAN communication lineAT- 1 0 3
7. Control cable adjustmentAT- 2 3 4
8. Control valve with TCMAT- 2 4 1
OFF vehicle9. Torque converterAT- 2 7 3
10. Oil pump assemblyAT- 2 9 0
11. 1st one-way clutchAT- 3 0 0
12. Gear systemAT- 2 6 1
13. Reverse brakeAT- 2 7 3
14. Direct clutchAT- 3 0 7
15. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 8
, AT-1 9 .)AT- 2 7 3
16. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-1 8
, AT - 1 9
.)AT- 2 7 3
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-85
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: August 20072004 QX56
48
OthersShift point is low in “D”
position.ON vehicle1. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 11 2
,
AT- 1 3 6
2. Accelerator pedal position sensorAT- 1 2 9
3. CAN communication lineAT- 1 0 3
4. Control valve with TCMAT- 2 4 1
49Judder occurs during
lock-up.ON vehicle1. Fluid level and stateAT- 5 8
2. Engine speed signalAT- 11 5
3. Turbine revolution sensorAT- 1 3 4
4. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 11 2,
AT- 1 3 6
5. Accelerator pedal position sensorAT- 1 2 9
6. CAN communication lineAT- 1 0 3
7. Torque converter clutch solenoid valveAT- 11 8
8. Control valve with TCMAT- 2 4 1
OFF vehicle 9. Torque converterAT- 2 7 3
50Strange noise in “R”
position.ON vehicle1. Fluid level and stateAT- 5 8
2. Engine speed signalAT- 11 5
3. CAN communication lineAT- 1 0 3
4. Control valve with TCMAT- 2 4 1
OFF vehicle5. Torque converterAT- 2 7 3
6. Oil pump assemblyAT- 2 9 0
7. Gear systemAT- 2 6 1
8. High and low reverse clutchAT- 3 0 5
9. Reverse brakeAT- 2 7 3
51Strange noise in “N”
position.ON vehicle1. Fluid level and stateAT- 5 8
2. Engine speed signalAT- 11 5
3. CAN communication lineAT- 1 0 3
4. Control valve with TCMAT- 2 4 1
OFF vehicle5. Torque converterAT- 2 7 36. Oil pump assemblyAT- 2 9 0
7. Gear systemAT- 2 6 1
52Strange noise in “D”
position.ON vehicle1. Fluid level and stateAT- 5 8
2. Engine speed signalAT- 11 5
3. CAN communication lineAT- 1 0 3
4. Control valve with TCMAT- 2 4 1
OFF vehicle5. Torque converterAT- 2 7 3
6. Oil pump assemblyAT- 2 9 0
7. Gear systemAT- 2 6 1
8. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-1 8
, AT - 1 9
.)AT- 2 7 3
No. Items Symptom Condition Diagnostic ItemReference
page

AT-86
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
53
OthersVehicle dose not
decelerate by engine
brake.
Refer to AT-230,
"Vehicle Does Not
Decelerate By Engine
Brake" .ON vehicle1. PNP switchAT- 1 0 9
2. Fluid level and stateAT-5 8
3. Control cable adjustmentAT- 2 3 4
4. 1st position switchAT- 2 3 0
5. ATF pressure switch 5AT- 1 8 1
6. CAN communication lineAT- 1 0 3
7. Control valve with TCMAT- 2 4 1
OFF vehicle8. Input clutchAT- 2 9 59. High and low reverse clutchAT- 3 0 5
10. Direct clutchAT- 3 0 7
54Engine brake does
not operate in “2”
position.ON vehicle1. PNP switchAT- 1 0 9
2. Fluid level and stateAT-5 8
3. Control cable adjustmentAT- 2 3 4
5. ATF pressure switch 6AT- 1 8 4
6. CAN communication lineAT- 1 0 3
7. Control valve with TCMAT- 2 4 1
OFF vehicle8. Front brake (brake band)AT- 2 7 39. Input clutchAT- 2 9 5
10. High and low reverse clutchAT- 3 0 5
55Engine brake does
not operate in “1”
position.ON vehicle1. PNP switchAT- 1 0 9
2. Fluid level and stateAT-5 8
3. Control cable adjustmentAT- 2 3 4
4. 1st position switchAT- 2 3 0
5. ATF pressure switch 5AT- 1 8 1
6. CAN communication lineAT- 1 0 3
7. Control valve with TCMAT- 2 4 1
OFF vehicle8. Input clutchAT- 2 9 59. High and low reverse clutchAT- 3 0 5
10. Direct clutchAT- 3 0 7
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-87
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: August 20072004 QX56
56
OthersMaximum speed low.ON vehicle1. Fluid level and stateAT- 5 8
2. Line pressure testAT- 5 9
3. Accelerator pedal position sensorAT- 1 2 9
4. CAN communication lineAT- 1 0 3
5. Direct clutch solenoid valveAT- 1 5 7
6. Control valve with TCMAT- 2 4 1
OFF vehicle7. Torque converterAT- 2 7 3
8. Oil pump assemblyAT- 2 9 0
9. Input clutchAT- 2 9 5
10. Gear systemAT- 2 6 1
11. High and low reverse clutchAT- 3 0 5
12. Direct clutchAT- 3 0 7
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 8
, AT-1 9 .)AT- 2 7 3
14 Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-1 8
, AT - 1 9
.)AT- 2 7 3
57Extremely large
creep.ON vehicle1. Engine idle speed EC-32

2. CAN communication lineAT- 1 0 3
3. ATF pressure switch 5AT- 1 8 1
OFF vehicle 4. Torque converterAT- 2 7 3
58With selector lever in
“P” position, vehicle
does not enter parking
condition or, with
selector lever in
another position, park-
ing condition is not
cancelled.
Refer to AT- 1 9 3 , "
In
“P” Position, Vehicle
Moves When Pushed"
.ON vehicle1. PNP switchAT- 1 0 9
2. Control cable adjustmentAT- 2 3 4
3. Parking pawl componentsAT- 2 6 1
59Vehicle runs with
transmission in “P”
position.ON vehicle1. PNP switchAT- 1 0 9
2. Fluid level and stateAT- 5 8
3. Control cable adjustmentAT- 2 3 4
4. Control valve with TCMAT- 2 4 1
5. Parking pawl componentsAT- 2 6 1
OFF vehicle 6. Gear systemAT- 2 6 1
No. Items Symptom Condition Diagnostic ItemReference
page

AT-88
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
60
OthersVehicle runs with
transmission in “N”
position.
Refer to AT-194, "In
“N” Position, Vehicle
Moves" .ON vehicle1. PNP switchAT- 1 0 9
2. Fluid level and stateAT-5 8
3. Control cable adjustmentAT- 2 3 4
4. Control valve with TCMAT- 2 4 1
OFF vehicle5. Input clutchAT- 2 9 5
6. Gear systemAT- 2 6 1
7. Direct clutchAT- 3 0 7
8. Reverse brakeAT- 2 7 3
9. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT-1 8
, AT- 1 9 .)AT- 2 7 3
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 8
, AT- 1 9
.)AT- 2 7 3
61Engine does not start
in “N” or “P” position.
Refer to AT-192, "Engine Cannot Be
Started In “P” or “N”
Position" .ON vehicle1. Ignition switch and starterPG-4
, SC-
10
2. Control cable adjustmentAT- 2 3 4
3. PNP switchAT- 1 0 9
62Engine starts in posi-
tions other than “N” or
“P”.ON vehicle1. Ignition switch and starterPG-4
, SC-
10
2. Control cable adjustmentAT- 2 3 4
3. PNP switchAT- 1 0 9
63 Engine stall.ON vehicle1. Fluid level and stateAT-5 8
2. Engine speed signalAT - 11 5
3. Turbine revolution sensorAT- 1 3 4
4. Torque converter clutch solenoid valveAT - 11 8
5. CAN communication lineAT- 1 0 3
6. Control valve with TCMAT- 2 4 1
OFF vehicle 7. Torque converterAT- 2 7 3
64Engine stalls when
select lever shifted “N”
→ “D”, “R”.ON vehicle1. Fluid level and stateAT-5 8
2. Engine speed signalAT - 11 5
3. Turbine revolution sensorAT- 1 3 4
4. Torque converter clutch solenoid valveAT - 11 8
5. CAN communication lineAT- 1 0 3
6. Control valve with TCMAT- 2 4 1
OFF vehicle 7. Torque converterAT- 2 7 3
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-89
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: August 20072004 QX56
65 OthersEngine speed does
not return to idle.
Refer to AT- 2 2 0 ,
"Engine Speed Does
Not Return to Idle" .ON vehicle1. Fluid level and stateAT- 5 8
2. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 8 1,
AT- 1 5 7

3. ATF pressure switch 1 and front brake solenoid valveAT- 1 7 5
,
AT- 1 5 1
4. Accelerator pedal position sensorAT- 1 2 9
5. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 11 2,
AT- 1 3 6
6. CAN communication lineAT- 1 0 3
7. Control valve with TCMAT- 2 4 1
OFF vehicle8. Front brake (brake band)AT- 2 7 39. Direct clutchAT- 3 0 7
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-91
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: August 20072004 QX56
CONSULT-II Function (A/T)UCS002D8
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).
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 TESTConducted 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
AT F T E M P S E 1
0°C (32° F) - 20°C (68°F) - 80°C (176°F)3.2 - 2.5 - 0.8 V
AT F T E M P S E 23.2 - 2.4 - 0.65 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 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
TURBINE REV During driving (lock-up ON) Approximately matches the
engine speed.
VHCL/S SE·MTR During driving Approximately matches the
speedometer reading.

TROUBLE DIAGNOSIS
AT-93
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: August 20072004 QX56
CONSULT-II SETTING PROCEDURE
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.

For details, refer to the separate “CONSULT-II Operations Man-
ual”.
1. Turn ignition switch “OFF”.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data
link connector, which is located in instrument lower panel on
driver side.
3. Turn ignition switch “ON”. (Do not start engine.)
4. Touch “START (NISSAN BASED VHCL)”.
5. Touch “A/T”.
If “A/T” is not indicated, go to GI-39, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
6. Perform each diagnostic test mode according to each service
procedure.
SELF-DIAGNOSTIC RESULT MODE
Operation Procedure
1. Perform “CONSULT-II SETTING PROCEDURE” Refer to AT-93, "CONSULT-II SETTING PROCEDURE"
.
2. Touch “SELF-DIAG RESULTS”.
Display shows malfunction experienced since the last erasing
operation.
BBIA0369E
BCIA0029E
BCIA0030E
BCIA0031E

AT-94
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
Display Items List
X: Applicable, —: Not applicable
Items (CONSULT-II
screen terms)Malfunction is detected when...TCM self-
diagnosisOBD-II (DTC)
“A/T” with
CONSULT-IIMIL indicator
lamp*1,
“ENGINE” 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 malfunc-
tion.)P0615 —
TCM

TCM is malfunctioning. P0700 P0700
PNP SW/CIRC

PNP switch 1-4 signals input with impossible pattern

PNP switch 3 monitor terminal cut line

“P” position is detected from N position without any other position
being detected in between.P0705 P0705
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
TCM·RAM

TCM memory (RAM) is malfunctioning. P1702 —
TCM·ROM

TCM memory (ROM) is malfunctioning. P1703 —
TP SEN/CIRC A/T

TCM does not receive the proper accelerator pedal position signals
(input 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
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.P1716 P1716
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 M1
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

TROUBLE DIAGNOSIS
AT-95
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: August 20072004 QX56
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
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
solenoid 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
depressing 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
depressing 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
depressing accelerator pedal. (Other than during shift change)P1845 — Items (CONSULT-II
screen terms)Malfunction is detected when...TCM self-
diagnosisOBD-II (DTC)
“A/T” with
CONSULT-IIMIL indicator
lamp*1,
“ENGINE” with
CONSULT-II or
GST