clutch INFINITI QX4 2005 Factory Workshop Manual

TROUBLE DIAGNOSIS
AT-77
D
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B
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Revision: October 20052005 QX56
48
OthersShift point is low in “D”
position.ON vehicle1. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8
,
AT- 1 3 3
2. Accelerator pedal position sensorAT- 1 2 3
3. CAN communication lineAT- 9 5
4. Control valve with TCMAT- 2 3 1
49Judder occurs during
lock-up.ON vehicle1. Fluid level and stateAT- 5 0
2. Engine speed signalAT- 11 3
3. Turbine revolution sensorAT- 1 3 1
4. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
5. Accelerator pedal position sensorAT- 1 2 3
6. CAN communication lineAT- 9 5
7. Torque converter clutch solenoid valveAT- 11 5
8. Control valve with TCMAT- 2 3 1
OFF vehicle 9. Torque converterAT- 2 6 2
50Strange noise in “R”
position.ON vehicle1. Fluid level and stateAT- 5 0
2. Engine speed signalAT- 11 3
3. CAN communication lineAT- 9 5
4. Control valve with TCMAT- 2 3 1
OFF vehicle5. Torque converterAT- 2 6 2
6. Oil pump assemblyAT- 2 8 0
7. Gear systemAT- 2 5 0
8. High and low reverse clutchAT- 2 9 4
9. Reverse brakeAT- 2 6 2
51Strange noise in “N”
position.ON vehicle1. Fluid level and stateAT- 5 0
2. Engine speed signalAT- 11 3
3. CAN communication lineAT- 9 5
4. Control valve with TCMAT- 2 3 1
OFF vehicle5. Torque converterAT- 2 6 26. Oil pump assemblyAT- 2 8 0
7. Gear systemAT- 2 5 0
52Strange noise in “D”
position.ON vehicle1. Fluid level and stateAT- 5 0
2. Engine speed signalAT- 11 3
3. CAN communication lineAT- 9 5
4. Control valve with TCMAT- 2 3 1
OFF vehicle5. Torque converterAT- 2 6 2
6. Oil pump assemblyAT- 2 8 0
7. Gear systemAT- 2 5 0
8. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page

AT-78
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
53
OthersVehicle dose not
decelerate by engine
brake.
Refer to AT-219,
"Vehicle Does Not
Decelerate By Engine
Brake" .ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT-5 0
3. Control cable adjustmentAT- 2 2 8
4. 1st position switchAT- 2 1 9
5. ATF pressure switch 5AT- 1 6 4
6. CAN communication lineAT-9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Input clutchAT- 2 8 49. High and low reverse clutchAT- 2 9 4
10. Direct clutchAT- 2 9 6
54Engine brake does
not operate in “2”
position.ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT-5 0
3. Control cable adjustmentAT- 2 2 8
5. ATF pressure switch 6AT- 1 6 6
6. CAN communication lineAT-9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Front brake (brake band)AT- 2 6 29. Input clutchAT- 2 8 4
10. High and low reverse clutchAT- 2 9 4
55Engine brake does
not operate in “1”
position.ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT-5 0
3. Control cable adjustmentAT- 2 2 8
4. 1st position switchAT- 2 1 9
5. ATF pressure switch 5AT- 1 6 4
6. CAN communication lineAT-9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Input clutchAT- 2 8 49. High and low reverse clutchAT- 2 9 4
10. Direct clutchAT- 2 9 6
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-79
D
E
F
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MA
B
AT
Revision: October 20052005 QX56
56
OthersMaximum speed low.ON vehicle1. Fluid level and stateAT- 5 0
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 1 2 3
4. CAN communication lineAT- 9 5
5. Direct clutch solenoid valveAT- 1 4 8
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. Input clutchAT- 2 8 4
10. Gear systemAT- 2 5 0
11. High and low reverse clutchAT- 2 9 4
12. Direct clutchAT- 2 9 6
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 6
, AT-1 7 .)AT- 2 6 2
14 Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 6
, AT- 1 7
.)AT- 2 6 2
57Extremely large
creep.ON vehicle1. Engine idle speed EC-77

2. CAN communication lineAT- 9 5
3. ATF pressure switch 5AT- 1 6 4
OFF vehicle 4. Torque converterAT- 2 6 2
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 8 1 , "
In
“P” Position, Vehicle
Moves When Pushed"
.ON vehicle1. PNP switchAT- 1 0 4
2. Control cable adjustmentAT- 2 2 8
OFF vehicle 3. Parking pawl componentsAT- 2 5 0
59Vehicle runs with
transmission in “P”
position.ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT- 5 0
3. Control cable adjustmentAT- 2 2 8
4. Control valve with TCMAT- 2 3 1
5. Parking pawl componentsAT- 2 5 0
OFF vehicle 6. Gear systemAT- 2 5 0
No. Items Symptom Condition Diagnostic ItemReference
page

AT-80
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
60
OthersVehicle runs with
transmission in “N”
position.
Refer to AT-182, "In
“N” Position, Vehicle
Moves" .ON vehicle1. PNP switchAT- 1 0 4
2. Fluid level and stateAT-5 0
3. Control cable adjustmentAT- 2 2 8
4. Control valve with TCMAT- 2 3 1
OFF vehicle5. Input clutchAT- 2 8 4
6. Gear systemAT- 2 5 0
7. Direct clutchAT- 2 9 6
8. Reverse brakeAT- 2 6 2
9. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT-1 6
, AT-1 7 .)AT- 2 6 2
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-1 6
, AT- 1 7
.)AT- 2 6 2
61Engine does not start
in “N” or “P” position.
Refer to AT-180, "Engine Cannot Be
Started In “P” or “N”
Position" .ON vehicle1. Ignition switch and starterPG-4
, SC-
10
2. Control cable adjustmentAT- 2 2 8
3. PNP switchAT- 1 0 4
62Engine starts in posi-
tions other than “N” or
“P”.ON vehicle1. Ignition switch and starterPG-4
, SC-
10
2. Control cable adjustmentAT- 2 2 8
3. PNP switchAT- 1 0 4
63 Engine stall.ON vehicle1. Fluid level and stateAT-5 0
2. Engine speed signalAT - 11 3
3. Turbine revolution sensorAT- 1 3 1
4. Torque converter clutch solenoid valveAT - 11 5
5. CAN communication lineAT-9 5
6. Control valve with TCMAT- 2 3 1
OFF vehicle 7. Torque converterAT- 2 6 2
64Engine stalls when
select lever shifted “N”
→ “D”, “R”.ON vehicle1. Fluid level and stateAT-5 0
2. Engine speed signalAT - 11 3
3. Turbine revolution sensorAT- 1 3 1
4. Torque converter clutch solenoid valveAT - 11 5
5. CAN communication lineAT-9 5
6. Control valve with TCMAT- 2 3 1
OFF vehicle 7. Torque converterAT- 2 6 2
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-81
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Revision: October 20052005 QX56
65 OthersEngine speed does
not return to idle.
Refer to AT- 2 0 9 ,
"Engine Speed Does
Not Return to Idle" .ON vehicle1. Fluid level and stateAT- 5 0
2. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 6 0,
AT- 1 4 4
4. Accelerator pedal position sensorAT- 1 2 3
5. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
6. CAN communication lineAT- 9 5
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Front brake (brake band)AT- 2 6 29. Direct clutchAT- 2 9 6
No. Items Symptom Condition Diagnostic ItemReference
page

AT-84
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
ATF PRES SW 1Front brake engaged. Refer to AT- 1 9ON
Front brake disengaged. Refer to AT- 1 9
OFF
ATF PRES SW 2Low coast brake engaged. Refer to AT-1 9
ON
Low coast brake disengaged. Refer to AT- 1 9
OFF
ATF PRES SW 3Input clutch engaged. Refer to AT- 1 9
ON
Input clutch disengaged. Refer to AT- 1 9
OFF
ATF PRES SW 5Direct clutch engaged. Refer to AT- 1 9
ON
Direct clutch disengaged. Refer to AT- 1 9
OFF
ATF PRES SW 6High and low reverse clutch engaged. Refer to AT- 1 9
ON
High and low reverse clutch disengaged. Refer to AT- 1 9
OFF
I/C SOLENOIDInput clutch disengaged. Refer to AT- 1 9
0.6 - 0.8 A
Input clutch engaged. Refer to AT- 1 9
0 - 0.05 A
FR/B SOLENOIDFront brake engaged. Refer to AT- 1 9
0.6 - 0.8 A
Front brake disengaged. Refer to AT- 1 9
0 - 0.05 A
D/C SOLENOIDDirect clutch disengaged. Refer to AT- 1 9
0.6 - 0.8 A
Direct clutch engaged. Refer to AT- 1 9
0 - 0.05 A
HLR/C SOLHigh and low reverse clutch disengaged. Refer to AT- 1 9
0.6 - 0.8 A
High and low reverse clutch engaged. Refer to AT- 1 9
0 - 0.05 A
ON OFF SOLLow coast brake engaged. Refer to AT-1 9
ON
Low coast brake disengaged. Refer to AT- 1 9
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 (Approx.)

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-115
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Revision: October 20052005 QX56
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP:31940
DescriptionECS00CFN

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 ValueECS00CFO
On Board Diagnosis LogicECS00CFP

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0740 TCC SOLENOID/CIRC” with 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 CauseECS00CFQ

Torque converter clutch solenoid valve

Harness or connectors
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureECS00CFR
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- 11 6 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
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
BCIA0030E

AT-116
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Revision: October 20052005 QX56
Diagnostic ProcedureECS00CFS
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.
3. Start engine.
4. Read out the value of “TCC SOLENOID” while driving.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 6 8 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. DETECT MALFUNCTIONING ITEM
Check the following items:

The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT-231, "Control Valve With TCM and A/T Fluid
Temperature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform “DTC Confirmation Procedure”.

Refer to AT-115, "DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
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

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
AT-117
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Revision: October 20052005 QX56
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)PFP:31940
DescriptionECS00CFT
This malfunction is detected when the A/T does not shift into 5th gear position or the torque converter clutch
does not lock-up as instructed by the TCM. This is not only caused by electrical malfunction (circuits open or
shorted) but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation,
etc.
CONSULT-II Reference ValueECS00CFU
On Board Diagnosis LogicECS00CFV

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0744 A/T TCC S/V FNCTN” with CONSULT-II is detected under the following
conditions.
–When A/T cannot perform lock-up even if electrical circuit is good.
–When TCM detects as irregular by comparing difference value with slip rotation.
Possible CauseECS00CFW

Harness or connectors
(The solenoid circuit is open or shorted.)

Torque converter clutch solenoid valve

Hydraulic control circuit
DTC Confirmation ProcedureECS00CFX
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. Start engine and Select “TCC S/V FNCTN CHECK” of “DTC
WORK SUPPORT” mode for “A/T” with CONSULT-II and touch
“START”.
2. Accelerate vehicle to more than 80 km/h (50 MPH) and maintain
the following condition continuously until “TESTING” has turned
to “COMPLETE”. (It will take approximately 30 seconds after
“TESTING” shows.)
ACCELE POSI: More than 1.0/8 (at all times during step 4)
TCC SOLENOID: 0.4 - 0.6 A
Selector lever: “D” position
[Reference speed: Constant speed of more than 80 km/h (50
MPH)]
–Make sure “GEAR” shows “5”.
–For shift schedule, refer to AT- 3 2 2 , "Vehicle Speed When Performing and Releasing Complete
Lock-up" .
–If “TESTING” does not appear on CONSULT-II for a long time, select “SELF-DIAG RESULTS”. In
case a 1st trip DTC other than P0744 is shown, refer to applicable “TROUBLE DIAGNOSIS FOR
DTC”.
3. Make sure that “OK” is displayed. (If “NG” is displayed, refer to “DIAGNOSTIC PROCEDURE”.)
Refer to AT- 11 8 , "
Diagnostic Procedure" .
Refer to shift schedule, AT-322, "
Vehicle Speed When Performing and Releasing Complete Lock-up" .
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
BCIA0030E

AT-136
DTC P1730 A/T INTERLOCK
Revision: October 20052005 QX56
Judgement of A/T InterlockECS00CH9
When A/T Interlock is judged to be malfunctioning, the vehicle should be fixed in 2nd gear, and should be set
in a condition in which it can travel.
When one of the following fastening patterns is detected, the fail-safe function in correspondence with the indi-
vidual pattern should be performed.
A/T INTERLOCK COUPLING PATTERN TABLE

: NG, X: OK
Diagnostic ProcedureECS00CHA
1. SELF-DIAGNOSIS
With CONSULT-II
1. Drive vehicle.
2. Stop vehicle and turn ignition switch “OFF”.
3. Turn ignition switch “ON”.
4. Select “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II.
OK or NG
OK >> GO TO 2.
NG >> Check low coast brake solenoid valve circuit and func-
tion. Refer to AT-156, "
DTC P1772 LOW COAST
BRAKE SOLENOID VALVE" , AT - 1 5 8 , "DTC P1774
LOW COAST BRAKE SOLENOID VALVE FUNCTION" .
2. CHECK DTC
Perform “DTC Confirmation Procedure”.

Refer to AT-135, "DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 3.
3. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 6 8 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
Gear positionATF pressure switch output
Fail-safe
functionClutch pressure output pattern after fail-safe func-
tion
SW3
(I/C)SW6
(HLR/
C)SW5
(D/C)SW1
(FR/B)SW2
(LC/B)I/C HLR/C D/C FR/B LC/B L/U
A/T interlock
coupling pat-
tern3rd – X X –
Held in
2nd gearOFF OFF ON OFF OFF OFF
4th – X X –
Held in
2nd gearOFF OFF ON OFF OFF OFF
5th X X – X
Held in
2nd gearOFF OFF ON OFF OFF OFF
BCIA0031E