Infiniti F50. Manual - part 98

TROUBLE DIAGNOSIS FOR SYMPTOMS

AT-277

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AT

A/T Does Not Shift: 2nd gear 

→

 1st gear

ECS0089R

SYMPTOM:

When shifted from 2M to 1M position in manual mode, does not downshift from 2nd to 1st gear.

DIAGNOSTIC PROCEDURE

1. 

CHECK SELF-DIAGNOSTIC RESULTS

Execute self-diagnosis.
Do the self-diagnostic results indicate PNP switch, ATF pressure switch 5?

YES

>> Check the malfunctioning system. Refer to 

AT-105, "DTC P0705 PARK/NEUTRAL POSITION

SWITCH"

 , 

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

 .

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 CONTROL LINKAGE

Check the control linkage.

●

Refer to 

AT-282, "Checking of A/T Position"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Adjust control linkage. Refer to 

AT-282, "Adjustment of

A/T Position"

 .

4. 

MANUAL MODE SWITCH

Check the manual mode switch. Refer to 

AT-215, "DTC P1815 MANUAL MODE SWITCH"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts.

SAT638A

SCIA1612E

AT-278

TROUBLE DIAGNOSIS FOR SYMPTOMS

5. 

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 6.

NG

>> GO TO 9.

6. 

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 7.

NG

>> Repair or replace damaged parts.

7. 

CHECK SYMPTOM

Check again.
OK or NG

OK

>> INSPECTION END

NG

>> GO TO 8.

8. 

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.

9. 

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 7.

NG

>> Repair or replace damaged parts.

SAT171B

TROUBLE DIAGNOSIS FOR SYMPTOMS

AT-279

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AT

Vehicle Does Not Decelerate By Engine Brake

ECS0089S

SYMPTOM:

No engine brake is applied when the gear is shifted from the 2nd to 1st gear.

DIAGNOSTIC PROCEDURE

1. 

CHECK SELF-DIAGNOSTIC RESULTS

Execute self-diagnosis.
Do the self-diagnostic results indicate PNP switch, ATF pressure switch 5?

YES

>> Check the malfunctioning system. Refer to 

AT-105, "DTC P0705 PARK/NEUTRAL POSITION

SWITCH"

 , 

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

 .

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 CONTROL LINKAGE

Check the control linkage.

●

Refer to 

AT-282, "Checking of A/T Position"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Adjust control linkage. Refer to 

AT-282, "Adjustment of

A/T Position"

 .

4. 

MANUAL MODE SWITCH

Check the manual mode switch. Refer to 

AT-215, "DTC P1815 MANUAL MODE SWITCH"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts.

SAT638A

SCIA1612E

AT-280

TROUBLE DIAGNOSIS FOR SYMPTOMS

5. 

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 6.

NG

>> GO TO 9.

6. 

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 7.

NG

>> Repair or replace damaged parts.

7. 

CHECK SYMPTOM

Check again.
OK or NG

OK

>> INSPECTION END

NG

>> GO TO 8.

8. 

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.

9. 

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 7.

NG

>> Repair or replace damaged parts.

SAT171B