Infiniti F50. Manual - part 93

TROUBLE DIAGNOSIS FOR SYMPTOMS

AT-257

D

E

F

G

H

I

J

K

L

M

A

B

AT

7. 

CHECK A/T FLUID CONDITION

1.

Remove oil pan. Refer to 

AT-289, "Control Valve Assembly"

 .

2.

Check A/T fluid condition.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 11.

8. 

DETECT MALFUNCTIONING ITEM

●

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to 

AT-60,

"Symptom Chart"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Repair or replace damaged parts.

9. 

CHECK SYMPTOM

Check again.
OK or NG

OK

>> INSPECTION END

NG

>> GO TO 10.

10. 

PERFORM TCM INSPECTION

1.

Perform TCM input/output signal inspection.

2.

If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace damaged parts.

11. 

DETECT MALFUNCTIONING ITEM

●

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to 

AT-60,

"Symptom Chart"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Repair or replace damaged parts.

SAT171B

AT-258

TROUBLE DIAGNOSIS FOR SYMPTOMS

A/T Does Not Shift: D

3

  

→

 D

4

ECS0089H

SYMPTOM:

●

The vehicle does not shift-up from the D

3

  to D

4

  gear at the specified speed.

●

The vehicle does not shift-up from the D

3

  to D

4

  gear unless A/T is warmed up.

DIAGNOSTIC PROCEDURE

1. 

CONFIRM THE SYMPTOM

Check if vehicle creeps forward in “D” position” and vehicle can be started from D

1.

OK or NG

OK

>> GO TO 2.

NG

>> Refer to 

AT-247, "Vehicle Does Not Creep Forward In “D” Position"

 , 

AT-251, "Vehicle Cannot Be

Started From D

1

"

 .

2. 

CHECK SELF-DIAGNOSTIC RESULTS

Execute self-diagnosis.

Do the self-diagnostic results indicate ATF pressure switch 1, ATF pressure switch 3, front brake solenoid
valve, input clutch solenoid valve, accelerator pedal position sensor, vehicle speed sensor A/T (revolution sen-
sor) and vehicle speed sensor MTR?

YES

>> Check the malfunctioning system. Refer to 

AT-219, "DTC P1841 ATF PRESSURE SWITCH 1"

 ,

AT-223, "DTC P1843 ATF PRESSURE SWITCH 3"

 , 

AT-170, "DTC P1752 INPUT CLUTCH

SOLENOID VALVE"

 , 

AT-179, "DTC P1757 FRONT BRAKE SOLENOID VALVE"

 , 

AT-144, "DTC

P1705 THROTTLE POSITION SENSOR"

 , 

AT-110, "DTC P0720 VEHICLE SPEED SENSOR A/T

(REVOLUTION SENSOR)"

 , 

AT-157, "DTC P1721 VEHICLE SPEED SENSOR MTR"

 .

NO

>> GO TO 3.

3. 

CHECK A/T FLUID LEVEL

Check A/T fluid level again. Refer to 

AT-14, "Checking A/T Fluid"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Refill ATF.

4. 

CHECK LINE PRESSURE

Check line pressure at the engine stall point. Refer to 

AT-52, "LINE

PRESSURE TEST"

 .

OK or NG

OK

>> GO TO 7.

NG  - 1 >> Line pressure high. GO TO 5.
NG  - 2 >> Line pressure low. GO TO 6.

SAT638A

SAT494G

TROUBLE DIAGNOSIS FOR SYMPTOMS

AT-259

D

E

F

G

H

I

J

K

L

M

A

B

AT

5. 

DETECT MALFUNCTIONING ITEM

1.

Control valve assembly. Refer to 

AT-289, "Control Valve Assembly"

 .

2.

Disassemble A/T. Refer to 

AT-307, "DISASSEMBLY"

 .

3.

Check the following items:

–

Oil pump assembly. Refer to 

AT-321, "Oil Pump"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace damaged parts.

6. 

DETECT MALFUNCTIONING ITEM

1.

Control valve assembly. Refer to 

AT-289, "Control Valve Assembly"

 .

2.

Disassemble A/T. Refer to 

AT-307, "DISASSEMBLY"

 .

3.

Check the following items:

–

Oil pump assembly. Refer to 

AT-321, "Oil Pump"

 .

–

Power train system. Refer to 

AT-307, "DISASSEMBLY"

 .

–

Transmission case. Refer to 

AT-307, "DISASSEMBLY"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace damaged parts.

7. 

CHECK A/T FLUID CONDITION

1.

Remove oil pan. Refer to 

AT-289, "Control Valve Assembly"

 .

2.

Check A/T fluid condition.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 11.

8. 

DETECT MALFUNCTIONING ITEM

●

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to 

AT-60,

"Symptom Chart"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Repair or replace damaged parts.

9. 

CHECK SYMPTOM

Check again.
OK or NG

OK

>> INSPECTION END

NG

>> GO TO 10.

SAT171B

AT-260

TROUBLE DIAGNOSIS FOR SYMPTOMS

10. 

PERFORM TCM INSPECTION

1.

Perform TCM input/output signal inspection.

2.

If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace damaged parts.

11. 

DETECT MALFUNCTIONING ITEM

●

Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to 

AT-60,

"Symptom Chart"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Repair or replace damaged parts.

A/T Does Not Shift: D

4

  

→

 D

5

ECS0089I

SYMPTOM:

●

The vehicle does not shift-up from the D

4

 to D

5

 gear at the specified speed.

●

The vehicle does not shift-up from the D

4

  to D

5

 gear unless A/T is warmed up.

DIAGNOSTIC PROCEDURE

1. 

CONFIRM THE SYMPTOM

Check if vehicle creeps forward in “D” position” and vehicle can be started from D

1.

OK or NG

OK

>> GO TO 2.

NG

>> Refer to 

AT-247, "Vehicle Does Not Creep Forward In “D” Position"

 ,

AT-251, "Vehicle Cannot Be

Started From D

1

"

 .

2. 

CHECK SELF-DIAGNOSTIC RESULTS

Execute self-diagnosis.

Do the self-diagnostic results indicate ATF pressure switch 1, ATF pressure switch 5, front brake solenoid
valve, direct clutch solenoid valve, accelerator pedal position sensor, turbine revolution sensor, vehicle speed
sensor A/T (revolution sensor) and vehicle speed sensor MTR?

YES

>> Check the malfunctioning system. Refer to 

AT-219, "DTC P1841 ATF PRESSURE SWITCH 1"

 ,

AT-227, "DTC P1845 ATF PRESSURE SWITCH 5"

 , 

AT-179, "DTC P1757 FRONT BRAKE

SOLENOID VALVE"

 , 

AT-188, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"

 , 

AT-144,

"DTC P1705 THROTTLE POSITION SENSOR"

 , 

AT-152, "DTC P1716 TURBINE REVOLUTION

SENSOR"

 , 

AT-110, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"

 ,

AT-157, "DTC P1721 VEHICLE SPEED SENSOR MTR"

 .

NO

>> GO TO 3.

3. 

CHECK A/T FLUID LEVEL

Check A/T fluid level again. Refer to 

AT-14, "Checking A/T Fluid"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Refill ATF.

SAT638A