Infiniti F50. Manual - part 43

TROUBLE DIAGNOSIS

AT-57

D

E

F

G

H

I

J

K

L

M

A

B

AT

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-60

 .

 With CONSULT-II

Read the gear position, throttle degree of opening, and vehicle speed.

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, 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-60

 .

 With CONSULT-II

Read the gear position, throttle degree of opening, and vehicle speed.

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, 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-60

 .

 With CONSULT-II

Read the gear position, throttle degree of opening, and vehicle speed.

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, then continue

the road test.

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-60

 .

 With CONSULT-II

Read the gear position, throttle degree of opening, and vehicle speed.

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, then continue

the road test.

AT-58

TROUBLE DIAGNOSIS

6. 

CHECK LOCK-UP

When releasing accelerator pedal from D5, check lock-up from D5 to L/U.

●

Refer to 

AT-60

 .

 With CONSULT-II

Select “TCC SOLENOID 0.00A” with the “MAIN SIGNAL” mode for A/T. Refer to 

AT-87, "CONSULT-II REF-

ERENCE 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, then continue

the road test.

7. 

CHECK LOCK-UP HOLD

Does it maintain lock-up status?

Yes

>> GO TO 8.

No

>> Enter a check mark at “A/T hold does not lock-up condition” on the diagnostics worksheet, 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 SOLENOID 0.00A” with the “MAIN SIGNAL” mode for A/T. Refer to 

AT-87, "CONSULT-II REF-

ERENCE VALUE"

 .

Does lock-up cancel?

Yes

>> GO TO 9.

No

>> Enter a check mark at “Lock-up is not released” on the diagnostics worksheet, then continue the

road test.

9. 

CHECK SHIFT DOWN D5 

→

 D4

Decelerate by pressing lightly on the brake pedal.

 With CONSULT-II

Read the gear position and engine speed.

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 Cruise test - Part 2 (Refer to 

AT-58

 ).

No

>> Enter a check mark at “A/T does not shift down” on the diagnostics worksheet, then continue the

road test. Go to Cruise test - Part 2 (Refer to 

AT-58

 ).

Cruise Test - Part 2

ECS0083C

Cruise test Part 2

1. 

CHECK STARTING FROM D1

1.

Move selector lever the “D” position.

2.

Accelerate at half throttle.

 With CONSULT-II

Read the gear position.
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, then

continue the road test.

TROUBLE DIAGNOSIS

AT-59

D

E

F

G

H

I

J

K

L

M

A

B

AT

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-60

  .

 With CONSULT-II

Read the gear position, throttle position and vehicle speed.

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, then con-

tinue 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-60

  .

 With CONSULT-II

Read the gear position, throttle position and vehicle speed.

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, then con-

tinue the road test.

4. 

CHECK SHIFT UP D3 

→

 D4 AND ENGINE BRAKE

When the transmission changes speed D3 

→

 D4, return the accelerator pedal.

Does the A/T shift up D3 

→

 D4 and apply the engine brake?

Yes

>> 1. Stop the vehicle.

2. Go to Cruise test - Part 3 (Refer to 

AT-59

 ).

No

>> Enter a check mark at “Vehicle does not shift D3 

→

 D4” on the diagnostics worksheet, then con-

tinue the road test. 

Cruise Test - Part 3

ECS0083D

Cruise test Part 3

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 check mark to “Cannot be changed to manual mode” on diagnostics

worksheet.

2. 

CHECK SHIFT DOWN

During manual mode driving, is downshift from 5

M

  

→

 4

M

  

→

 3

M

  

→

 2

M

  

→

 1

M

  performed?

 With CONSULT-II

Read the gear position.

Is downshifting correctly performed?

Yes

>> GO TO 3.

No

>> Enter a check mark at “Vehicle does not shift” at the corresponding position (5

M

  

→

 4

M

 , 4

M

  

→

 3

M

, 3

M

  

→

 2

M

 , 2

M

  

→

 1

M

 ) on the diagnostics worksheet, then continue the road test.

AT-60

TROUBLE DIAGNOSIS

3. 

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-87, "SELF-DIAGNOSTIC PROCEDURE (WITH

CONSULT-II)"

 , 

AT-97, "Diagnostic Procedure Without CONSULT-II"

 .

No

>> Enter a check mark at “Vehicle does not decelerate by engine brake” on the diagnostics work-

sheet, then continue trouble diagnosis.

Vehicle Speed When Shifting Gears

ECS0083E

●

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

Vehicle Speed When Performing and Releasing Complete Lock-up 

ECS0083F

●

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

●

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

Vehicle Speed When Performing and Releasing Slip Lock-up

ECS0083G

●

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

Symptom Chart

ECS0083H

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

Throttle position

Vehicle speed km/h (MPH)

D

1

 

→

D

2

D

2

 

→

D

3

D

3

 

→

D

4

D

4

 

→

D

5

D

5

 

→

D

4

D

4

 

→

D

3

D

3

 

→

D

2

D

2

 

→

D

1

Full throttle 

64 - 68

(40 - 42)

95 - 103

(59 - 64)

147 - 157

(91 - 98)

219 - 229

(136 - 142)

215 - 225

(134 - 140)

136 - 146

(85 - 91)

85 - 93

(53 - 58)

41 - 45

(25 - 28)

Half throttle 

22 - 26

(14 - 16)

59 - 67

(37 - 42)

100 - 110

(62 - 68)

153 - 163

(95 - 101)

102 - 112

(63 - 70)

55 - 65

(34 - 40)

38 - 46

(24 - 29)

11 - 15

(7 - 9)

Throttle position

Vehicle speed km/h (MPH)

Lock-up “ON”

Lock-up “OFF”

Closed throttle

71 - 79 (44 - 49)

53 - 61 (33 - 38)

Half throttle

191 - 199 (119 - 124)

136 - 144 (85 - 89)

Throttle position

Gear position

Vehicle speed km/h (MPH)

Slip lock-up “ON”

Slip lock-up “OFF”

Closed throttle

3rd 

27 - 35 (17 - 22)

24 - 32 (15 - 20)

4th 

39 - 47 (24 - 29)

36 - 44 (22 - 27)

5th 

48 - 56 (30 - 35)

45 - 53 (28 - 33)

Symptom

Condition

Diagnostic Item

Reference page

Shift point is high in 
D position.

ON vehicle

1. Vehicle speed sensor A/T and vehicle speed sensor MTR

AT-110

, 

AT-157

2. Accelerator pedal position sensor

AT-144

3. CAN communication line

AT-99

4. ATF temperature sensor

AT-146

5. Control valve assembly

AT-289

Shift point is low in 
D position.

ON vehicle

1. Vehicle speed sensor A/T and vehicle speed sensor MTR

AT-110

, 

AT-157

2. Accelerator pedal position sensor

AT-144

3. CAN communication line

AT-99

4. Control valve assembly

AT-289