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
.
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
.
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
.
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
.
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
With CONSULT-II
Select “TCC SOLENOID 0.00A” with the “MAIN SIGNAL” mode for A/T. Refer to
.
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
.
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
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
).
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
.
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
.
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
).
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
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
,
2. Accelerator pedal position sensor
3. CAN communication line
4. ATF temperature sensor
5. Control valve assembly
Shift point is low in
D position.
ON vehicle
1. Vehicle speed sensor A/T and vehicle speed sensor MTR
,
2. Accelerator pedal position sensor
3. CAN communication line
4. Control valve assembly
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