Infiniti F50. Manual - part 43

 

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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

 

 

 

 

 

 

 

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