2005 INFINITI QX4 transmission fluid

AT-30
A/T CONTROL SYSTEM
Revision: October 20052005 QX56
CAN CommunicationECS00CDX
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. For details, refer to LAN-5,
"CAN COMMUNICATION" .
Input/Output Signal of TCMECS00CDY
*1: Spare for vehicle speed sensor·A/T (revolution sensor)
*2: Spare for accelerator pedal position signal
*3: If these input and output signals are different, the TCM triggers the fail-safe function.
*4: CAN communicationsControl itemLine
pressure
controlVehicle
speed
controlShift
controlLock-up
controlEngine
brake
controlFail-safe
function
(*3)Self-diag-
nostics
function
InputAccelerator pedal position signal
(*4)XXXXXXX
Vehicle speed sensor A/T
(revolution sensor)XXXX XX
Vehicle speed sensor MTR
(*1) (*4)XXXX X
Closed throttle position signal
(*4)(*2) X (*2) X X (*2) X X
Wide open throttle position signal
(*4)(*2) X (*2) X (*2) X X
Turbine revolution sensor 1 X X X X X
Turbine revolution sensor 2
(for 4th speed only)XX X XX
Engine speed signals
(*4)XX
PNP switch XXXXXXX
A/T fluid temperature sensors 1, 2 X X X X X X X
ASCDOperation signal
(*4)XXXX
Overdrive cancel
signal
(*4)XXX
TCM power supply voltage signal X X X X X X
Out-
putDirect clutch solenoid (ATF pres-
sure switch 5)XX XX
Input clutch solenoid (ATF pressure
switch 3)XX XX
High and low reverse clutch sole-
noid (ATF pressure switch 6)XX XX
Front brake solenoid (ATF pressure
switch 1)XX XX
Low coast brake solenoid (ATF
pressure switch 2)XX XXX
Line pressure solenoid X X X X X X X
TCC solenoid X X X
Starte r re la yXX

AT-46
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
4❏ Perform all road tests and enter checks in required inspection items.AT-5 3
4-1.Check before engine is started
AT-5 4
❏ AT-180, "A/T CHECK Indicator Lamp Does Not Come On" .
❏ Perform self-diagnostics Enter checks for detected items. AT- 8 5
❏ AT- 9 5 , "DTC U1000 CAN COMMUNICATION LINE"
❏ AT- 9 9 , "DTC P0615 START SIGNAL CIRCUIT"
❏ AT- 1 0 3 , "DTC P0700 TCM"
❏ AT- 1 0 4 , "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏ AT- 1 0 8 , "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
❏ AT- 11 3 , "DTC P0725 ENGINE SPEED SIGNAL"
❏ AT- 11 5 , "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏ AT- 11 7 , "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏ AT- 11 9 , "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏ AT- 1 2 1 , "DTC P1702 TRANSMISSION CONTROL MODULE (RAM)"
❏ AT- 1 2 2 , "DTC P1703 TRANSMISSION CONTROL MODULE (ROM)"
❏ AT- 1 2 3 , "DTC P1705 THROTTLE POSITION SENSOR"
❏ AT- 1 2 6 , "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏ AT- 1 3 1 , "DTC P1716 TURBINE REVOLUTION SENSOR"
❏ AT- 1 3 3 , "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏ AT- 1 3 5 , "DTC P1730 A/T INTERLOCK"
❏ AT- 1 3 8 , "DTC P1731 A/T 1ST ENGINE BRAKING"
❏ AT- 1 4 0 , "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏ AT- 1 4 2 , "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT- 1 4 4 , "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏ AT- 1 4 6 , "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏ AT- 1 4 8 , "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏ AT- 1 5 0 , "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT- 1 5 2 , "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏ AT- 1 5 4 , "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
FUNCTION"
❏ AT- 1 5 6 , "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏ AT- 1 5 8 , "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏ AT- 1 6 0 , "DTC P1841 ATF PRESSURE SWITCH 1"
❏ AT- 1 6 2 , "DTC P1843 ATF PRESSURE SWITCH 3"
❏ AT- 1 6 4 , "DTC P1845 ATF PRESSURE SWITCH 5"
❏ AT- 1 6 6 , "DTC P1846 ATF PRESSURE SWITCH 6"
4-2.Idle inspection
AT-5 4
❏ AT-180, "Engine Cannot Be Started In “P” or “N” Position"
❏ AT-181, "In “P” Position, Vehicle Moves When Pushed"
❏ AT-182, "In “N” Position, Vehicle Moves"
❏ AT-183, "Large Shock (“N” to “D” Position)"
❏ AT-187, "Vehicle Does Not Creep Backward In “R” Position"
❏ AT-190, "Vehicle Does Not Creep Forward In “D” Position"
4-3.Driving tests
AT-5 5
Part 1
❏ AT-192, "
Vehicle Cannot Be Started From D1"
❏ AT-195, "A/T Does Not Shift: D1 → D2"
❏ AT-197, "A/T Does Not Shift: D2 → D3"
❏ AT-199, "A/T Does Not Shift: D3 → D4"
❏ AT-202, "A/T Does Not Shift: D4 → D5"
❏ AT-204, "A/T Does Not Perform Lock-up"
❏ AT-206, "A/T Does Not Hold Lock-up Condition"
❏ AT-208, "Lock-up Is Not Released"
❏ AT-209, "Engine Speed Does Not Return to Idle"

TROUBLE DIAGNOSIS
AT-47
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
44-3Part 2
AT- 5 7
❏ AT-192, "Vehicle Cannot Be Started From D1"
❏ AT-195, "A/T Does Not Shift: D1 → D2"
❏ AT-197, "A/T Does Not Shift: D2 → D3"
❏ AT-199, "A/T Does Not Shift: D3 → D4"
Part 3
AT- 5 8
❏ AT-210, "A/T Does Not Shift: 5th gear → 4th gear"
❏ AT-213, "A/T Does Not Shift: 4th gear → 3rd gear"
❏ AT-214, "A/T Does Not Shift: 3rd gear → 2nd gear"
❏ AT-216, "A/T Does Not Shift: 2nd gear → 1st gear"
❏ AT-219, "Vehicle Does Not Decelerate By Engine Brake"
❏ Perform self-diagnostics Enter checks for detected items. AT- 8 5
❏ AT-95, "DTC U1000 CAN COMMUNICATION LINE"
❏ AT-99, "DTC P0615 START SIGNAL CIRCUIT"
❏ AT-103, "DTC P0700 TCM"
❏ AT-104, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏ AT-108, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
❏ AT-113, "DTC P0725 ENGINE SPEED SIGNAL"
❏ AT-115, "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏ AT-117, "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏ AT-119, "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏ AT-121, "DTC P1702 TRANSMISSION CONTROL MODULE (RAM)"
❏ AT-122, "DTC P1703 TRANSMISSION CONTROL MODULE (ROM)"
❏ AT-123, "DTC P1705 THROTTLE POSITION SENSOR"
❏ AT-126, "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏ AT-131, "DTC P1716 TURBINE REVOLUTION SENSOR"
❏ AT-133, "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏ AT-135, "DTC P1730 A/T INTERLOCK"
❏ AT-138, "DTC P1731 A/T 1ST ENGINE BRAKING"
❏ AT-140, "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏ AT-142, "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT-144, "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏ AT-146, "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏ AT-148, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏ AT-150, "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT-152, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏ AT-154, "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
FUNCTION"
❏ AT-156, "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏ AT-158, "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏ AT-160, "DTC P1841 ATF PRESSURE SWITCH 1"
❏ AT-162, "DTC P1843 ATF PRESSURE SWITCH 3"
❏ AT-164, "DTC P1845 ATF PRESSURE SWITCH 5"
❏ AT-166, "DTC P1846 ATF PRESSURE SWITCH 6"
5❏ Inspect each system for items found to be NG in the self-diagnostics and repair or replace the malfunction
parts.
6❏ Perform all road tests and enter the checks again for the required items.AT- 5 3
7❏ For any remaining NG items, perform the “diagnostics procedure” and repair or replace the malfunction parts.
See the chart for diagnostics by symptoms. (This chart also contains other symptoms and inspection proce-
dures.)AT- 6 0
8❏ Erase the results of the self-diagnostics from the TCM.AT- 3 8

AT-70
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
30
Slips/Will
Not
engageNo shock at all or the
clutch slips when
vehicle changes
speed D
4 → D5 .ON vehicle1. Fluid level and stateAT-5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 6 0,
AT- 1 4 4
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
5. CAN communication lineAT-9 5
6. Line pressure testAT-5 1
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. Front brake (brake band)AT- 2 6 2
11. Input clutchAT- 2 8 4
12. Gear systemAT- 2 5 0
13. High and low reverse clutchAT- 2 9 4
31When you press the
accelerator pedal and
shift speed D5 → D4
the engine idles or the
transmission slips.ON vehicle1. Fluid level and stateAT-5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 6 0,
AT- 1 4 4
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
5. CAN communication lineAT-9 5
6. Line pressure testAT-5 1
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. Input clutchAT- 2 8 4
11. Gear systemAT- 2 5 0
12. High and low reverse clutchAT- 2 9 4
13. Direct clutchAT- 2 9 6
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-71
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
32
Slips/Will
Not
engageWhen you press the
accelerator pedal and
shift speed D4 → D3
the engine idles or the
transmission slips.ON vehicle1. Fluid level and stateAT- 5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 3 and input clutch solenoid valveAT- 1 6 2,
AT- 1 4 0
4. ATF pressure switch 1 and front brake solenoid valveAT- 1 6 0,
AT- 1 4 4
5. CAN communication lineAT- 9 5
6. Line pressure testAT- 5 1
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converter AT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. 3rd one-way clutchAT- 2 8 2
11. Gear systemAT- 2 5 0
12. High and low reverse clutchAT- 2 9 4
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
33When you press the
accelerator pedal and
shift speed D3 → D2
the engine idles or the
transmission slips.ON vehicle1. Fluid level and stateAT- 5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT- 1 6 6,
AT- 1 5 2
4. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
5. CAN communication lineAT- 9 5
6. Line pressure testAT- 5 1
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. 3rd one-way clutchAT- 2 8 2
11. Gear systemAT- 2 5 0
12. Direct clutchAT- 2 9 6
13. 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-72
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
34
Slips/Will
Not
EngageWhen you press the
accelerator pedal and
shift speed D2 → D1
the engine idles or the
transmission slips.ON vehicle1. Fluid level and stateAT-5 0
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 3
3. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 4,
AT- 1 4 8
4. CAN communication lineAT-9 5
5. Line pressure testAT-5 1
6. Control valve with TCMAT- 2 3 1
OFF vehicle7. Torque converterAT- 2 6 2
8. Oil pump assemblyAT- 2 8 0
9. 3rd one-way clutchAT- 2 8 2
10. 1st one-way clutchAT- 2 8 9
11. Gear systemAT- 2 5 0
12. Reverse brakeAT- 2 6 2
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
35With selector lever in
“D” position, accelera-
tion is extremely poor.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. PNP switchAT- 1 0 4
6. Control cable adjustmentAT- 2 2 8
7. Control valve with TCMAT- 2 3 1
OFF vehicle8. Torque converterAT- 2 6 2
9. Oil pump assemblyAT- 2 8 0
10. 1st one-way clutchAT- 2 8 9
11. Gear systemAT- 2 5 0
12. Reverse brakeAT- 2 6 2
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
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-79
D
E
F
G
H
I
J
K
L
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