clutch INFINITI QX56 2004 Factory Workshop Manual

AT-84
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
44
Slips/Will
Not
EngageVehicle cannot run in
all positions.ON vehicle1. Fluid level and stateAT-5 8
2. Line pressure testAT-5 9
3. PNP switchAT- 1 0 9
4. Control cable adjustmentAT- 2 3 4
5. Control valve with TCMAT- 2 4 1
OFF vehicle6. Oil pump assemblyAT- 2 9 07. Gear systemAT- 2 6 1
8. Output shaftAT- 2 7 3
45With selector lever in
“D” position, driving is
not possible.ON vehicle1. Fluid level and stateAT-5 8
2. Line pressure testAT-5 9
3. PNP switchAT- 1 0 9
4. Control cable adjustmentAT- 2 3 4
5. Control valve with TCMAT- 2 4 1
OFF vehicle6. Torque converterAT- 2 7 3
7. Oil pump assembly AT- 2 9 0
8. 1st one-way clutchAT- 3 0 0
9. Gear systemAT- 2 6 1
10. Reverse brakeAT- 2 7 3
11. 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
12. 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
46With selector lever in
“R” position, driving is
not possible.ON vehicle1. Fluid level and stateAT-5 8
2. Line pressure testAT-5 9
3. PNP switchAT- 1 0 9
4. Control cable adjustmentAT- 2 3 4
5. Control valve with TCMAT- 2 4 1
OFF vehicle6. Gear systemAT- 2 6 17. Output shaftAT- 2 7 3
8. Reverse brakeAT- 2 7 3
47 OthersShift point is high 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. ATF temperature sensorAT- 1 3 1
5. Control valve with TCMAT- 2 4 1
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

AT-92
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
ATF PRES SW 1Front brake engaged. Refer to AT- 2 1ON
Front brake disengaged. Refer to AT- 2 1
OFF
ATF PRES SW 2Low coast brake engaged. Refer to AT-2 1
ON
Low coast brake disengaged. Refer to AT- 2 1
OFF
ATF PRES SW 3Input clutch engaged. Refer to AT- 2 1
ON
Input clutch disengaged. Refer to AT- 2 1
OFF
ATF PRES SW 5Direct clutch engaged. Refer to AT- 2 1
ON
Direct clutch disengaged. Refer to AT- 2 1
OFF
ATF PRES SW 6High and low reverse clutch engaged. Refer to AT- 2 1
ON
High and low reverse clutch disengaged. Refer to AT- 2 1
OFF
I/C SOLENOIDInput clutch disengaged. Refer to AT- 2 1
0.6 - 0.8 A
Input clutch engaged. Refer to AT- 2 1
0 - 0.05 A
FR/B SOLENOIDFront brake engaged. Refer to AT- 2 1
0.6 - 0.8 A
Front brake disengaged. Refer to AT- 2 1
0 - 0.05 A
D/C SOLENOIDDirect clutch disengaged. Refer to AT- 2 1
0.6 - 0.8 A
Direct clutch engaged. Refer to AT- 2 1
0 - 0.05 A
HLR/C SOLHigh and low reverse clutch disengaged. Refer to AT- 2 1
0.6 - 0.8 A
High and low reverse clutch engaged. Refer to AT- 2 1
0 - 0.05 A
ON OFF SOLLow coast brake engaged. Refer to AT-2 1
ON
Low coast brake disengaged. Refer to AT- 2 1
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
THROTTLE 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

AT-118
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Revision: August 20072004 QX56
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP:31940
DescriptionUCS002E7

The torque converter clutch solenoid valve is activated, with the gear in D4 , D5 by the TCM in response
to signals sent from the vehicle speed sensor and accelerator pedal position sensor (throttle position sen-
sor). Torque converter clutch piston operation will then be controlled.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 1/8) in lock-up condition, the engine speed should not
change abruptly. If there is a big jump in engine speed, there is no lock-up.
CONSULT-II Reference ValueUCS002E8
On Board Diagnosis LogicUCS002E9

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “TCC SOLENOID/CIRC” with CONSULT-II or P0740 without CONSULT-II is
detected under the following conditions.
–When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
–When TCM detects as irregular by comparing target value with monitor value.
Possible CauseUCS002EA

Torque converter clutch solenoid valve

Harness or connectors
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureUCS002EB
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-II.
3. Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL SPEED SE: 80 km/h (50 MPH) or more
ACCELE POS: 0.5/8 - 1.0/8
SELECTOR LEVER: “D” position
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
4. If DTC is detected go to AT-119, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Item name Condition Display value (Approx.) (A)
TCC SOLENOIDWhen performing slip lock-up 0.2 - 0.4
When performing lock-up 0.4 - 0.6
BCIA0030E

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-119
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: August 20072004 QX56
Diagnostic ProcedureUCS002EC
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.
3. Start the engine.
4. Read out the value of “TCC SOLENOID” while driving.
OK or NG
OK >> GO TO 6.
NG >> GO TO 2.
2. CHECK TCM
Perform TCM input/output signals inspection. Refer to AT-90, "
TCM Input/Output Signal Reference Values" .
OK or NG
OK >> GO TO 3.
NG >> GO TO 5.
3. CHECK DTC
Perform “DTC Confirmation Procedure”.

Refer to AT- 11 8 , "DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 4.
4. DETECT MALFUNCTIONING ITEM
Check the following items:

The A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT - 2 4 1 , "Control Valve With TCM and A/T Fluid
Temperature Sensor 2" .
NG >> Repair or replace damaged parts.
5. DETECT MALFUNCTIONING ITEM
Check the following items:

Power supply and ground circuit for TCM.

The A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
Item name Condition Display value (Approx.)
TCC SOLENOIDWhen performing slip lock-up 0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
SCIA4793E

AT-120
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Revision: August 20072004 QX56
6. CHECK DTC
Perform “DTC Confirmation Procedure”.

Refer to AT-118, "DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.