Infiniti F50. Manual - part 95

TROUBLE DIAGNOSIS FOR SYMPTOMS

AT-265

D

E

F

G

H

I

J

K

L

M

A

B

AT

A/T Does Not Hold Lock-up Condition

ECS0089K

SYMPTOM:

The lock-up condition cannot be maintained for more than 30 seconds.

DIAGNOSTIC PROCEDURE

1. 

CHECK SELF-DIAGNOSTIC RESULTS

Execute self-diagnosis.
Do the self-diagnostic results indicate torque converter clutch solenoid valve, engine speed signal, turbine rev-
olution sensor, CAN communication?

YES

>> Check the malfunctioning system. Refer to 

AT-117, "DTC P0740 TORQUE CONVERTER

CLUTCH SOLENOID VALVE"

 , 

AT-115, "DTC P0725 ENGINE SPEED SIGNAL"

 , 

AT-152, "DTC

P1716 TURBINE REVOLUTION SENSOR"

 , 

AT-99, "DTC U1000 CAN COMMUNICATION LINE"

.

NO

>> GO TO 2.

2. 

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 3.

NG

>> Refill ATF.

3. 

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 4.

NG

>> GO TO 7.

4. 

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 5.

NG

>> Repair or replace damaged parts.

5. 

CHECK SYMPTOM

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

SAT638A

SAT171B

AT-266

TROUBLE DIAGNOSIS FOR SYMPTOMS

6. 

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.

7. 

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 5.

NG

>> Repair or replace damaged parts.

TROUBLE DIAGNOSIS FOR SYMPTOMS

AT-267

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AT

Lock-up Is Not Released

ECS0089L

SYMPTOM:

The lock-up condition cannot be cancelled even after releasing the accelerator pedal.

DIAGNOSTIC PROCEDURE

1. 

CHECK SELF-DIAGNOSTIC RESULTS

Execute self-diagnosis.
Do the self-diagnostic results indicate torque converter clutch solenoid valve, engine speed signal, turbine rev-
olution sensor, CAN communication?

YES

>> Check the malfunctioning system. Refer to 

AT-117, "DTC P0740 TORQUE CONVERTER

CLUTCH SOLENOID VALVE"

 , 

AT-115, "DTC P0725 ENGINE SPEED SIGNAL"

 , 

AT-152, "DTC

P1716 TURBINE REVOLUTION SENSOR"

 , 

AT-99, "DTC U1000 CAN COMMUNICATION LINE"

.

NO

>> GO TO 2.

2. 

CHECK SYMPTOM

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

3. 

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.

AT-268

TROUBLE DIAGNOSIS FOR SYMPTOMS

Engine Speed Does Not Return To Idle

ECS0089M

SYMPTOM:

When a shift-down is performed, the engine speed does not smoothly return to the idling speed.

DIAGNOSTIC PROCEDURE

1. 

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 2.

NG

>> Refill ATF.

2. 

CHECK SELF-DIAGNOSTIC RESULTS

Execute self-diagnosis.

Do the self-diagnostic results indicate front brake solenoid valve, direct clutch solenoid valve, ATF pressure
switch 1, ATF pressure switch 5, 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-179, "DTC P1757 FRONT BRAKE SOLENOID

VALVE"

 , 

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

 , 

AT-219, "DTC P1841 ATF

PRESSURE SWITCH 1"

 , 

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

 , 

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 CONDITION

1.

Remove oil pan. Refer to 

AT-289, "Control Valve Assembly"

 .

2.

Check A/T fluid condition.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 7.

4. 

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 5.

NG

>> Repair or replace damaged parts.

5. 

CHECK SYMPTOM

Check again.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

SAT171B