INFINITI FX35 2004 Service Manual

AT-54
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
Judgement of Line Pressure Test
ROAD TEST
Description

The road test inspects 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 5
.
2. Check at idle. Refer to AT- 5 5
.
3. Cruise test

Inspect all the items from Part 1 to Part 3. Refer to AT- 5 7 , 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
complete.
Judgement Possible cause
Idle speedLow 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 positionPossible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
HighPossible 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
Stall speedOil 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 positionPossible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.

TROUBLE DIAGNOSIS
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Revision: 2004 November 2004 FX35/FX45
Check Before Engine is StartedACS007A8
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”. (Do not start engine.)
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 1 , "
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, carry out self-diagnostics and record all NG items on the diagnostics
worksheet. Refer to AT- 9 4
, AT- 1 0 3 .
NO >> 1. Turn ignition switch “OFF”.
2. Carry out the self-diagnostics and record all NG items on the diagnostics worksheet. Refer to
AT- 9 4
, AT- 1 0 3 .
3. Go to AT- 5 5 , "
Check at Idle" .
Check at Idle ACS007A9
1. CHECK STARTING THE ENGINE
1. Park vehicle on level surface.
2. Move selector lever to “P” or “N” position.
3. Turn ignition switch “OFF”.
4. Turn ignition switch “START”.
Does the engine start?
YES >> GO TO 2.
NO >> Stop the road test and go to AT- 1 9 3 , "
Engine Cannot Be Started In “P” or “N” Position" .
2. CHECK STARTING THE ENGINE
1. Turn ignition switch “ON”. (Do not start engine.)
2. Move selector lever in “D”, “M” or “R” position.
3. Turn ignition switch “START”.
Does the engine start in either position?
YES >> Stop the road test and go to AT- 1 9 3 , "Engine Cannot Be Started In “P” or “N” Position" .
NO >> GO TO 3.
3. CHECK “P” POSITION FUNCTIONS
1. Move selector lever to “P” position.
2. Turn ignition switch “OFF”.
3. Release the parking brake.
4. Push the vehicle forward or backward.
5. Engage the parking brake.
When you push the vehicle with disengaging the parking brake, does it move?
YES >> Enter a check mark at “In “P” position, Vehicle Moves When Pushed” on the diagnostics work-
sheet AT- 4 6
, then continue the road test.
NO >> GO TO 4.

AT-56
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
4. CHECK “N” POSITION FUNCTIONS
1. Start the engine.
2. Move selector lever to “N” position.
3. Release the parking brake.
Does vehicle move forward or backward?
YES >> Enter a check mark at “In “N” position Vehicle Moves” on the diagnostics worksheet AT- 4 6 , then
continue the road test.
NO >> GO TO 5.
5. CHECK SHIFT SHOCK
1. Engage the brake.
2. Move selector lever to “D” position.
When the transmission is shifted from
“N” to “D”, is there an excessive shock?
YES >> Enter a check mark at “Large Shock (“N” to “D” Position)” on the diagnostics worksheet AT- 4 6 ,
then continue the road test.
NO >> GO TO 6.
6. CHECK “R” POSITION FUNCTIONS
1. Engage the brake.
2. Move selector lever to “R” position.
3. Release the brake for 4 to 5 seconds.
Does the vehicle creep backward?
YES >> GO TO 7.
NO >> Enter a check mark at “Vehicle Does Not Creep Backward In “R” Position” on the diagnostics
worksheet AT- 4 6
, then continue the road test.
7. CHECK “D” POSITION FUNCTIONS
Inspect whether the vehicle moves forward when the transmission is put into the “D” position.
Does the vehicle creep forward in the
“D” positions?
YES >> Go to AT- 5 7 , "Cruise Test - Part 1" , AT- 6 0 , "Cruise Test - Part 2" and AT- 6 1 , "Cruise Test - Part 3"
.
NO >> Enter a check mark at “Vehicle Does not Creep Forward In “D” Position” on the diagnostics work-
sheet AT- 4 6
, then continue the road test. Go to AT- 5 7 , "Cruise Test - Part 1" , AT- 6 0 , "Cruise Test
- Part 2" and AT- 6 1 , "Cruise Test - Part 3" .

TROUBLE DIAGNOSIS
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Revision: 2004 November 2004 FX35/FX45
Cruise Test - Part 1ACS007AA
1. CHECK STARTING OUT FROM D1
1. Drive the vehicle for about 10 minutes to warm up the engine oil and A/T fluid.
Appropriate temperature for the A/T fluid: 50 - 80°C (122 - 176°F)
2. Park the vehicle on a level surface.
3. Move selector lever to “P” position.
4. Start the engine.
5. Move selector lever to “D” position.
6. Press the accelerator pedal about half way down to accelerate the vehicle.
With CONSULT-II
Read off the gear positions. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
Start from D1?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle Cannot Be Started From D1” on the diagnostics worksheet AT- 4 6
,
then continue the road test.
2. CHECK SHIFT UP D1 → D2
Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D1 → D2) at the appropri-
ate speed.

Refer to AT- 6 2 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Read the gear position, throttle opening, and vehicle speed. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
Does the A/T shift up D1
→ D2 at the correct speed?
YES >> GO TO 3.
NO >> Enter a check mark at “A/T Does Not Shift:D1 → D2” on the diagnostics worksheet AT- 4 6
, then
continue the road test.
3. CHECK SHIFT UP D2 → D3
Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D2 → D3) at the appropri-
ate speed.

Refer to AT- 6 2 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Read the gear position, throttle opening, and vehicle speed. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
Does the A/T shift up D2
→ D3 at the correct speed?
YES >> GO TO 4.
NO >> Enter a check mark at “A/T Does Not Shift:D2 → D3” on the diagnostics worksheet AT- 4 6
, then
continue the road test.
4. CHECK SHIFT UP D3 → D4
Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D3 → D4) at the appropri-
ate speed.

Refer to AT- 6 2 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Read the gear position, throttle opening, and vehicle speed. Refer to Data AT- 9 7 , "
DATA MONITOR MODE" .
Does the A/T shift up D3
→ D4 at the correct speed?
YES >> GO TO 5.
NO >> Enter a check mark at “A/T Does Not Shift:D3 → D4” on the diagnostics worksheet AT- 4 6
, then
continue the road test.

AT-58
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
5. CHECK SHIFT UP D4 → D5
Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D4 → D5) at the appropri-
ate speed.

Refer to AT- 6 2 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Read the gear position, throttle opening, and vehicle speed. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
Does the A/T shift up D4
→ D5 at the correct speed?
YES >> GO TO 6.
NO >> Enter a check mark at “A/T Does Not Shift:D4 → D5” on the diagnostics worksheet AT- 4 6
, then
continue the road test.
6. CHECK LOCK-UP
When releasing accelerator pedal from D5, check lock-up from D5 to L/U.

Refer to AT- 6 2 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Select “TCC SOL 0.00A” with the “MAIN SIGNAL” mode for “A/T”. Refer to AT- 9 1 , "
CONSULT-II REFER-
ENCE VALUE" .
Does it lock-up?
YES >> GO TO 7.
NO >> Enter a check mark at “A/T Does Not Perform Lock-up” on the diagnostics worksheet AT- 4 6
, then
continue the road test.
7. CHECK LOCK-UP HOLD
Check hold lock-up.
With CONSULT-II
Select “TCC SOL 0.00A” with the “MAIN SIGNAL” mode for “A/T”. Refer to AT- 9 1 , "
CONSULT-II REFER-
ENCE VALUE" .
Does it maintain lock-up status?
YES >> GO TO 8.
NO >> Enter a check mark at “A/T Does Not Hold Lock-up Condition” on the diagnostics worksheet AT-
46 , then continue the road test.
8. CHECK LOCK-UP RELEASE
Check lock-up cancellation by depressing brake pedal lightly to decelerate.
With CONSULT-II
Select “TCC SOL 0.00A” with the “MAIN SIGNAL” mode for “A/T”. Refer to AT- 9 1 , "
CONSULT-II REFER-
ENCE VALUE" .
Does lock-up cancel?
YES >> GO TO 9.
NO >> Enter a check mark at “Lock-up Is Not Released” on the diagnostics worksheet AT- 4 6
, then con-
tinue the road test.

TROUBLE DIAGNOSIS
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Revision: 2004 November 2004 FX35/FX45
9. CHECK SHIFT DOWN D5 → D4
Decelerate by pressing lightly on the brake pedal.
With CONSULT-II
Read the gear position and engine speed. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
When the A/T shift down D5
→ D4, does the engine speed drop smoothly back to idle?
YES >> 1. Stop the vehicle.
2. Go to AT- 6 0 , "
Cruise Test - Part 2" .
NO >> Enter a check mark at “Engine Speed Does Not Return To Idle” on the diagnostics worksheet,
then continue the road test. Go to Cruise test - Part 2 (Refer to AT- 6 0
).

AT-60
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
Cruise Test - Part 2ACS007AB
1. CHECK STARTING FROM D1
1. Move selector lever to “D” position.
2. Accelerate at half throttle.
With CONSULT-II
Read the gear position. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
Does it start from D1?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle Cannot Be Started From D1” on the diagnostics worksheet AT- 4 6
,
then continue the road test.
2. CHECK SHIFT UP D1 → D2
Press the accelerator pedal down all the way and inspect whether or not the transmission shifts up (D1 → D2)
at the correct speed.

Refer to AT- 6 2 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Read the gear position, throttle position and vehicle speed. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
Does the A/T shift up D1
→ D2 at the correct speed?
YES >> GO TO 3.
NO >> Enter a check mark at “Vehicle Does Not Shift D1 → D2” on the diagnostics worksheet AT- 4 6
,
then continue the road test.
3. CHECK SHIFT UP D2 → D3
Press the accelerator pedal down all the way and inspect whether or not the transmission shifts up (D2 → D3)
at the correct speed.

Refer to AT- 6 2 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Read the gear position, throttle position and vehicle speed. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
Does the A/T shift up D2
→ D3 at the correct speed?
YES >> GO TO 4.
NO >> Enter a check mark at “Vehicle Does Not Shift D2 → D3” on the diagnostics worksheet AT- 4 6
,
then continue the road test.
4. CHECK SHIFT UP D3 → D4 AND ENGINE BRAKE
When the transmission changes speed D3 → D4, return the accelerator pedal.
With CONSULT-II
Read the gear position. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
Does the A/T shift up D3
→ D4 and apply the engine brake?
YES >> 1. Stop the vehicle.
2. Go to AT- 6 1 , "
Cruise Test - Part 3" .
NO >> Enter a check mark at “Vehicle Does Not Shift D3 → D4” on the diagnostics worksheet AT- 4 6
,
then continue the road test. (Refer to AT- 6 1
).

TROUBLE DIAGNOSIS
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Revision: 2004 November 2004 FX35/FX45
Cruise Test - Part 3ACS007AC
1. MANUAL MODE FUNCTION
Move to manual mode from D position.
Does it switch to manual mode?
YES >> GO TO 2.
NO >> Continue road test and add checkmark to “Cannot Be Changed To Manual Mode” on diagnostics
worksheet AT- 4 6
.
2. CHECK SHIFT DOWN
During manual mode driving, is downshift from M5 → M4 → M3 → M2 → M1 performed?
With CONSULT-II
Read the gear position. Refer to AT- 9 7 , "
DATA MONITOR MODE" .
Is downshifting correctly performed?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle Does Not Shift” at the corresponding position (5th → 4th, 4th →
3rd, 3rd → 2nd, 2nd → 1st) on the diagnostics worksheet AT- 4 6
, then continue the road test.
3. CHECK ENGINE BRAKE
Check engine brake.
Does engine braking effectively reduce speed in M1 position?
YES >> 1. Stop the vehicle.
2. Carry out the self-diagnostics. Refer to AT- 9 4 , "
SELF-DIAGNOSTIC RESULT MODE" , AT- 1 0 3 ,
"Diagnostic Procedure Without CONSULT-II" .
NO >> Enter a check mark at “Vehicle Does Not Decelerate By Engine Brake” on the diagnostics work-
sheet AT- 4 6
, then continue trouble diagnosis.

AT-62
TROUBLE DIAGNOSIS
Revision: 2004 November 2004 FX35/FX45
Vehicle Speed When Shifting GearsACS007AD
2WD MODELS

At half throttle, the accelerator opening is 4/8 of the full opening.
AW D M OD E LS

At half throttle, the accelerator opening is 4/8 of the full opening.

At half throttle, the accelerator opening is 4/8 of the full opening. Engine model VQ35DE
Throttle positionVehicle speed km/h (MPH)
D
1 →D2D2 →D3D3 →D4D4 →D5D5 →D4D4 →D3D3 →D2D2 →D1
Full throttle 68 - 72
(42 - 45)106 - 114
(66 - 71)164 - 174
(102 - 108)235 - 245
(146 - 152)231 - 241
(144 - 150)154 - 164
(96 - 102)89 - 97
(55 - 60)37 - 43
(23 - 27)
Half throttle 54 - 58
(34 - 36)83 - 91
(52 - 57)126 - 136
(78 - 85)158 - 168
(98 - 104)103 - 113
(64 - 70)74 - 84
(46 - 52)34 - 42
(21 - 26)11 - 1 5
(7 - 9)
Engine model VQ35DE
Throttle positionVehicle speed km/h (MPH)
D
1 →D2D2 →D3D3 →D4D4 →D5D5 →D4D4 →D3D3 →D2D2 →D1
Full throttle 62 - 66
(39 - 41)96 - 104
(60 - 65)149 - 159
(93 - 99)213 - 223
(132 - 139)209 - 219
(130 - 136)121 - 131
(75 - 81)81 - 89
(50 - 55)39 - 43
(24 - 27)
Half throttle 49 - 53
(30 - 33)75 - 83
(47 - 52)114 - 124
(71 - 77)141 - 151
(88 - 94)94 - 104
(58 - 65)66 - 76
(41 - 47)31 - 39
(19 - 24)11 - 1 5
(7 - 9)
Engine model VK45DE
Throttle positionVehicle speed km/h (MPH)
D
1 →D2D2 →D3D3 →D4D4 →D5D5 →D4D4 →D3D3 →D2D2 →D1
Full throttle 64 - 68
(40 - 42)98 - 106
(61 - 66)152 - 162
(94 - 101)219 - 229
(136 - 142)215 - 225
(134 - 140)136 - 146
(85 - 91)85 - 93
(53 - 58)41 - 45
(25 - 28)
Half throttle 31 - 35
(19 - 22)59 - 67
(37 - 42)100 - 110
(62 - 68)166 - 176
(103 - 109)107 - 117
(66 - 73)65 - 75
(40 - 47)38 - 46
(24 - 29)12 - 16
(7 - 10)

TROUBLE DIAGNOSIS
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Revision: 2004 November 2004 FX35/FX45
Vehicle Speed When Performing and Releasing Complete Lock-up ACS007AE
2WD MODELS

At closed throttle, the accelerator opening is less than 1/8 condition.

At half throttle, the accelerator opening is 4/8 of the full opening.
AWD MODELS

At closed throttle, the accelerator opening is less than 1/8 condition.

At half throttle, the accelerator opening is 4/8 of the full opening.

At closed throttle, the accelerator opening is less than 1/8 condition.

At half throttle, the accelerator opening is 4/8 of the full opening. Engine model VQ35DE
Throttle positionVehicle speed km/h (MPH)
Lock-up “ON” Lock-up “OFF”
Closed throttle 63 - 73 (39 - 45) 40 - 48 (25 - 30)
Half throttle 196 - 204 (122 - 127) 153 - 161 (95 - 100)
Engine model VQ35DE
Throttle positionVehicle speed km/h (MPH)
Lock-up “ON” Lock-up “OFF”
Closed throttle 59 - 67 (37 - 42) 56 - 64 (35 - 40)
Half throttle 178 - 186 (111 - 116) 139 - 147 (86 - 91)
Engine model VK45DE
Throttle positionVehicle speed km/h (MPH)
Lock-up “ON” Lock-up “OFF”
Closed throttle 66 - 74 (41 - 46) 53 - 61 (33 - 38)
Half throttle 191 - 199 (119 - 124) 136 - 144 (85 - 89)