2005 INFINITI FX35 sensor

TROUBLE DIAGNOSIS AT-55
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Revision: 2005 July 2005 FX
6. Start the engine, then measure the line pressure at both idle and
the stall speed.
CAUTION:

Keep the brake pedal pressed all the way down during
measurement.

When measuring the line pressure at the stall speed,
refer to AT- 5 2 , "
STALL TEST" .
7. After the measurements are complete, install the oil pressure detection plug and tighten to the specified torque.
CAUTION:

Do not reuse the O-ring.

Apply ATF to the O-ring.
Line Pressure
Judgement of Line Pressure Test
:7.3 N·m (0.74 kg-m, 65 in-lb)SAT493G
Engine speed Line pressure [kPa (kg/cm
2 , psi)]
“R” position “D”, “M” positions
At idle speed 425 - 465 (4.3 - 4.8, 62 - 67) 379 - 428 (3.9 - 4.4, 55 - 62)
At stall speed 1,605 - 1,950 (16.4 - 19.9, 233 - 283) 1,310 - 1,500 (13.4 - 15.3, 190 - 218)
Judgement Possible cause
Idle speed Low for all positions
(“P”, “R”, “N”, “D”,
“M”) Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example

Oil pump wear

Pressure regulator valve or plug sticking or spring fatigue

Oil strainer
oil pump
pressure regulator valve passage oil leak

Engine idle speed too low
Only low for a spe-
cific position Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
High Possible causes include a sensor malfunction or malfunction in the line pressure adjustment func-
tion.
For example

Accelerator pedal position signal malfunction

ATF temperature sensor malfunction

Line pressure solenoid malfunction (sticking in OFF state, filter clog, cut line)

Pressure regulator valve or plug sticking

AT-56
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
ROAD TEST
Description

The road test checks overall performance of the A/T and analyzes possible malfunction causes.

The road test is carried out in the following three stages.
1. Check before engine is started. Refer to AT- 5 6
.
2. Check at idle. Refer to AT- 5 7
.
3. Cruise test

Inspect all the items from Part 1 to Part 3. Refer to AT- 5 8 , AT- 6 0 , AT- 6 1 .

Before beginning the road test, check the test procedure and inspection items.

Test all inspection items until the symptom is uncovered. Diagnose NG items when all road tests are com-
plete.
Check Before Engine Is StartedACS002LZ
1. CHECK A/T CHECK INDICATOR LAMP
1. Park vehicle on level surface.
2. Move selector lever to “P” position.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
Does A/T CHECK indicator lamp light up for about 2 seconds?
YES >> GO TO 2.
NO >> Stop the road test and go to AT- 1 9 3 , "
A/T CHECK Indicator Lamp Does Not Come On" .
2. CHECK A/T CHECK INDICATOR LAMP
Does A/T CHECK indicator lamp flash for about 8 seconds?
YES >> For TCM fail-safe mode, perform self-diagnostics and record all NG items on the AT- 4 7 , "DIAG-
NOSTIC WORKSHEET" . Refer to AT- 9 3 , "SELF-DIAGNOSTIC RESULT MODE" , AT- 1 0 3 , "Diag-
nostic Procedure without CONSULT-II" .
NO >> 1. Turn ignition switch OFF.
2. Perform self-diagnostics and record all NG items on the AT- 4 7 , "
DIAGNOSTIC WORKSHEET"
. Refer to AT- 9 3 , "SELF-DIAGNOSTIC RESULT MODE" , AT- 1 0 3 , "Diagnostic Procedure with-
out CONSULT-II" .
3. Go to AT- 5 7 , "
Check at Idle" .
Stall speed Oil pressure does
not rise higher than
the oil pressure for
idle. Possible causes include a sensor malfunction or malfunction in the pressure adjustment function.
For example

Accelerator pedal position signal malfunction

TCM breakdown

Line pressure solenoid malfunction (shorting, sticking in ON state)

Pressure regulator valve or plug sticking

Pilot valve sticking or pilot filter clogged
The pressure rises,
but does not enter
the standard posi-
tion. Possible causes include malfunctions in the pressure supply system and malfunction in the pres-
sure adjustment function.
For example

Accelerator pedal position signal malfunction

Line pressure solenoid malfunction (sticking, filter clog)

Pressure regulator valve or plug sticking

Pilot valve sticking or pilot filter clogged
Only low for a spe-
cific position Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
Judgement Possible cause

AT-64
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
Symptom ChartACS0080Q

The diagnostics item numbers show the sequence for inspection. Check in order from Item 1.

Overhaul and check inside the A/T only if A/T fluid condition is NG. Refer to AT- 5 2 , "A/T Fluid Condition
Check" .
No. Items Symptom Condition Diagnostic Item Reference
page
1 Shift
Shock Large shock. (“N”
→
“D” position)
Refer to AT-197,
"Large Shock (“N” to
“D” Position)" . ON vehicle 1. Engine idle speed
EC-83
(for
VQ35DE)
or EC-774

(for
VK45DE)
2. Engine speed signal AT- 1 2 3
3. Accelerator pedal position sensorAT- 1 3 3
4. Control linkage adjustmentAT- 2 3 5
5. A/T fluid temperature sensorAT- 1 3 6
6. ATF pressure switch 1 and front brake solenoid valve AT- 1 7 5,
AT- 1 5 4
7. CAN communication line AT- 1 0 6
8. A/T fluid level and state AT- 5 2
9. Line pressure testAT- 5 4
10. Control valve with TCMAT- 2 4 3
OFF vehicle 11. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-18, "Cross-Sectional View (2WD Models)" or AT- 1 9 , "Cross-
Sectional View (AWD Models)" ) AT- 2 9 0
2
Shock is too large
when changing D1 →
D
2 or M1 → M2 . ON vehicle 1. Accelerator pedal position sensor
AT- 1 3 3
2. Control linkage adjustmentAT- 2 3 5
3. ATF pressure switch 5 and direct clutch solenoid valve AT- 1 7 9,
AT- 1 5 8
4. CAN communication line AT- 1 0 6
5. Engine speed signalAT- 1 2 3
6. Turbine revolution sensorAT- 1 4 1
7. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT- 1 4 3
8. A/T fluid level and state AT- 5 2
9. Control valve with TCMAT- 2 4 3
OFF vehicle 10. Direct clutch AT- 3 2 6

TROUBLE DIAGNOSIS AT-65
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Revision: 2005 July 2005 FX
3
Shift
Shock Shock is too large
when changing D2 →
D
3 or M2 → M3 . ON vehicle 1. Accelerator pedal position sensor
AT-133
2. Control linkage adjustmentAT-235
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valve AT-181,
AT-162
4. CAN communication line AT-106
5. Engine speed signalAT-123
6. Turbine revolution sensorAT-141
7. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT-143
8. A/T fluid level and state AT- 5 2
9. Control valve with TCMAT-243
OFF vehicle 10. High and low reverse clutch AT-323
4 Shock is too large
when changing D3 →
D
4 or M3 → M4 . ON vehicle 1. Accelerator pedal position sensor
AT-133
2. Control linkage adjustmentAT-235
3. ATF pressure switch 3 and input clutch solenoid valve AT-177,
AT-150
4. CAN communication line AT-106
5. Engine speed signalAT-123
6. Turbine revolution sensorAT-141
7. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT-143
8. A/T fluid level and state AT- 5 2
9. Control valve with TCMAT-243
OFF vehicle 10. Input clutch AT-313
5 Shock is too large
when changing D4 →
D
5 or M4 → M5 . ON vehicle 1. Accelerator pedal position sensor
AT-133
2. Control linkage adjustmentAT-235
3. ATF pressure switch 1 and front brake solenoid valve AT-175,
AT-154

4. CAN communication line AT-106
5. Engine speed signalAT-123
6. Turbine revolution sensorAT-141
7. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT-143
8. A/T fluid level and state AT- 5 2
9. Control valve with TCMAT-243
OFF vehicle 10. Front brake (brake band)
AT-27811. Input clutchAT-313
No. Items Symptom Condition Diagnostic Item Reference
page

AT-66
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
6
Shift
Shock Shock is too large for
downshift when accel-
erator pedal is
pressed. ON vehicle 1. Accelerator pedal position sensor
AT- 1 3 3
2. Control linkage adjustmentAT- 2 3 5
3. CAN communication lineAT- 1 0 6
4. Engine speed signalAT- 1 2 3
5. Turbine revolution sensorAT- 1 4 1
6. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT- 1 4 3
7. A/T fluid level and state AT- 5 2
8. Control valve with TCMAT- 2 4 3
OFF vehicle 9. Front brake (brake band)
AT- 2 7 810. Input clutch AT- 3 1 3
11. High and low reverse clutchAT- 3 2 3
12. Direct clutchAT- 3 2 6
7 Shock is too large for
upshift when acceler-
ator pedal is released. ON vehicle 1. Accelerator pedal position sensor
AT- 1 3 3
2. Control linkage adjustmentAT- 2 3 5
3. Engine speed signalAT- 1 2 3
4. CAN communication lineAT- 1 0 6
5. Turbine revolution sensorAT- 1 4 1
6. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT- 1 4 3
7. A/T fluid level and state AT- 5 2
8. Control valve with TCMAT- 2 4 3
OFF vehicle 9. Front brake (brake band)
AT- 2 7 810. Input clutch AT- 3 1 3
11. High and low reverse clutch AT- 3 2 3
12. Direct clutch AT- 3 2 6
8 Shock is too large for
lock-up. ON vehicle 1. Accelerator pedal position sensor
AT- 1 3 3
2. Control linkage adjustmentAT- 2 3 5
3. Engine speed signalAT- 1 2 3
4. CAN communication lineAT- 1 0 6
5. Turbine revolution sensorAT- 1 4 1
6. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT- 1 4 3
7. Torque converter clutch solenoid valve AT- 1 2 5
8. A/T fluid level and state AT- 5 2
9. Control valve with TCMAT- 2 4 3
OFF vehicle 10. Torque converter AT- 2 9 0
No. Items Symptom Condition Diagnostic Item Reference
page

TROUBLE DIAGNOSIS AT-67
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Revision: 2005 July 2005 FX9 Shift
Shock Shock is too large
during engine brake. ON vehicle
1. Accelerator pedal position sensor
AT-133
2. Control linkage adjustmentAT-235
3. CAN communication lineAT-106
4. A/T fluid level and state AT- 5 2
5. Control valve with TCMAT-243
OFF vehicle 6. Front brake (brake band)
AT-2787. Input clutch AT-313
8. High and low reverse clutchAT-323
9. Direct clutch AT-326
10
No Up
Shift Gear does not change
from D
1 → D2 or from
M
1 → M2 .
Refer to AT-208, "
A/T
Does Not Shift: D1 →
D2" . ON vehicle 1. A/T fluid level and state
AT- 5 2
2. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT-143
3. ATF pressure switch 5 and direct clutch solenoid valve AT-179,
AT-158
4. Line pressure test AT- 5 4
5. CAN communication lineAT-106
6. Control valve with TCMAT-243
OFF vehicle 7. Direct clutch AT-326
11 Gear does not change
from D
2 → D3 or from
M
2 → M3 .
Refer to AT-210, "
A/T
Does Not Shift: D2 →
D3" . ON vehicle 1. A/T fluid level and state
AT- 5 2
2. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT-143
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valve AT-181,
AT-162
4. Line pressure test AT- 5 4
5. CAN communication lineAT-106
6. Control valve with TCMAT-243
OFF vehicle 7. High and low reverse clutch AT-323
12 Gear does not change
from D
3 → D4 or from
M
3 → M4 .
Refer to AT-212, "
A/T
Does Not Shift: D3 →
D4" . ON vehicle 1. A/T fluid level and state
AT- 5 2
2. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT-143
3. ATF pressure switch 3 and input clutch solenoid valve AT-177,
AT-150
4. ATF pressure switch 1 and front brake solenoid valve AT-175,
AT-154
5. Line pressure test AT- 5 4
6. CAN communication lineAT-106
7. Control valve with TCMAT-243
OFF vehicle 8. Input clutch AT-313
No. Items Symptom Condition Diagnostic Item Reference
page

AT-68
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
13 No Up
Shift Gear does not change
from D
4 → D5 or from
M
4 → M5 .
Refer to AT-215, "
A/T
Does Not Shift: D4 →
D5" . ON vehicle 1. A/T fluid level and state
AT- 5 2
2. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT- 1 4 3
3. ATF pressure switch 1 and front brake solenoid valve AT- 1 7 5,
AT- 1 5 4
4. ATF pressure switch 5 and direct clutch solenoid valve AT- 1 7 9,
AT- 1 5 8
5. Turbine revolution sensor AT- 1 4 1
6. Line pressure test AT- 5 4
7. CAN communication lineAT- 1 0 6
8. Control valve with TCMAT- 2 4 3
OFF vehicle 9. Front brake (brake band)
AT- 2 9 010. Input clutchAT- 3 1 3
14
No Down
Shift In “D” or “M” position,
does not downshift to
4th gear. ON vehicle 1. A/T fluid level and state
AT- 5 2
2. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT- 1 4 3

3. ATF pressure switch 1 and front brake solenoid valve AT- 1 7 5
,
AT- 1 5 4
4. ATF pressure switch 5 and direct clutch solenoid valve AT- 1 7 9,
AT- 1 5 8
5. CAN communication line AT- 1 0 6
6. Line pressure test AT- 5 4
7. Control valve with TCMAT- 2 4 3
OFF vehicle 8. Front brake (brake band)
AT- 2 9 09. Input clutchAT- 3 1 3
15 In “D” or “M” position,
does not downshift to
3rd gear. ON vehicle 1. A/T fluid level and state
AT- 5 2
2. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT- 1 4 3
3. ATF pressure switch 3 and input clutch solenoid valve AT- 1 7 7,
AT- 1 5 0
4. ATF pressure switch 1 and front brake solenoid valve AT- 1 7 5,
AT- 1 5 4
5. CAN communication line AT- 1 0 6
6. Line pressure test AT- 5 4
7. Control valve with TCMAT- 2 4 3
OFF vehicle 8. Input clutch AT- 3 1 3
No. Items Symptom Condition Diagnostic Item Reference
page

TROUBLE DIAGNOSIS AT-69
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Revision: 2005 July 2005 FX16
No Down
Shift In “D” or “M” position,
does not downshift to
2nd gear. ON vehicle 1. A/T fluid level and state
AT- 5 2
2. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT-143

3. ATF pressure switch 6, high and low reverse clutch sole-
noid valve AT-181
,
AT-162
4. CAN communication line AT-106
5. Line pressure test AT- 5 4
6. Control valve with TCMAT-243
OFF vehicle 7. High and low reverse clutch AT-323
17 In “D” or “M” position,
does not downshift to
1st gear. ON vehicle 1. A/T fluid level and state
AT- 5 2
2. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT-143
3. ATF pressure switch 5 and direct clutch solenoid valve AT-179,
AT-158
4. CAN communication line AT-106
5. Line pressure test AT- 5 4
6. Control valve with TCMAT-243
OFF vehicle 7. Direct clutch AT-326
18 Slips/Will
Not
Engage When “D” or “M” posi-
tion, remains in 1st
gear. ON vehicle
1. A/T fluid level and state
AT- 5 2
2. Vehicle speed sensor A/T and vehicle speed sensor MTR AT- 11 8,
AT-143
3. Direct clutch solenoid valve AT-158
4. Line pressure test AT- 5 4
5. CAN communication lineAT-106
6. Control valve with TCMAT-243
OFF vehicle 7. 3rd one-way clutch
AT- 3 11
8. 1st one-way clutchAT-318
9. Gear systemAT-278
10. Reverse brakeAT-290
11. Forward one-way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 8 , "
Cross-Sectional View (2WD Models)" or AT- 1 9 ,
"Cross-Sectional View (AWD Models)" ) AT-290
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT-18,
"Cross-Sectional View (2WD Models)" or AT-19, "Cross-
Sectional View (AWD Models)" ) AT-290
No. Items Symptom Condition Diagnostic Item
Reference
page