Infiniti M45 (Y34). Manual — part 98

TROUBLE DIAGNOSIS FOR SYMPTOMS

AT-277

D

E

F

G

H

I

J

K

L

M

A

B

AT

A/T Does Not Shift: D

2

→

D

3

ACS001FZ

SYMPTOM:

The vehicle does not shift-up from D

2

to D

3

gear at the specified speed.

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-268, "Vehicle Does Not Creep Forward in “D” Position"

,

AT-271, "Vehicle Cannot Be

Started From D

1

"

.

2.

CHECK SELF-DIAGNOSTIC RESULTS

Execute self-diagnosis.
Do the self-diagnostic results indicate ATF pressure switch 6, high and low reverse clutch solenoid valve,
accelerator pedal position sensor, vehicle speed sensor A/T (revolution sensor) and vehicle speed sensor
MTR?

YES

>> Check the malfunctioning system. Refer to

AT-246, "DTC P1846 ATF PRESSURE SWITCH 6"

,

AT-209, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"

,

AT-152, "DTC

P1705 THROTTLE POSITION SENSOR"

,

AT-116, "DTC P0720 VEHICLE SPEED SENSOR A/T

(REVOLUTION SENSOR)"

,

AT-165, "DTC P1721 VEHICLE SPEED SENSOR MTR"

.

NO

>> GO TO 3.

3.

CHECK A/T FLUID LEVEL

Check A/T fluid level. 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-53, "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

AT-278

TROUBLE DIAGNOSIS FOR SYMPTOMS

5.

DETECT MALFUNCTIONING ITEM

1.

Check control valve assembly. Refer to

AT-312, "Control Valve Assembly"

.

2.

Disassemble A/T. Refer to

AT-342, "DISASSEMBLY"

.

3.

Check the following items:

–

Oil pump assembly. Refer to

AT-357, "Oil Pump"

.

OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace damaged parts.

6.

DETECT MALFUNCTIONING ITEM

1.

Check control valve assembly. Refer to

AT-312, "Control Valve Assembly"

.

2.

Disassemble A/T. Refer to

AT-342, "DISASSEMBLY"

.

3.

Check the following items:

–

Oil pump assembly. Refer to

AT-357, "Oil Pump"

.

–

Power train system. Refer to

AT-342, "DISASSEMBLY"

.

–

Transmission case. Refer to

AT-342, "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-312, "Control Valve Assembly"

.

2.

Check A/T fluid condition. Refer to

AT-52, "Fluid Condition

Check"

.

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-63,

"Symptom Chart"

.

OK or NG

OK

>> GO TO 9.

NG

>> Repair or replace damaged parts.

9.

CHECK SYMPTOM

Check again. Refer to

AT-58, "Cruise Test - Part 1"

,

AT-60, "Cruise Test - Part 2"

.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 10.

SCIA5199E

TROUBLE DIAGNOSIS FOR SYMPTOMS

AT-279

D

E

F

G

H

I

J

K

L

M

A

B

AT

10.

CHECK TCM

1.

Check TCM input/output signal. Refer to

AT-86, "TCM Input/Output Signal Reference Values"

.

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-63,

"Symptom Chart"

.

OK or NG

OK

>> GO TO 9.

NG

>> Repair or replace damaged parts.

AT-280

TROUBLE DIAGNOSIS FOR SYMPTOMS

A/T Does Not Shift: D

3

→

D

4

ACS001G0

SYMPTOM:

●

The vehicle does not shift-up from D

3

to D

4

gear at the specified speed.

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-268, "Vehicle Does Not Creep Forward in “D” Position"

,

AT-271, "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-234, "DTC P1841 ATF PRESSURE SWITCH 1"

,

AT-238, "DTC P1843 ATF PRESSURE SWITCH 3"

,

AT-179, "DTC P1752 INPUT CLUTCH

SOLENOID VALVE"

,

AT-189, "DTC P1757 FRONT BRAKE SOLENOID VALVE"

,

AT-152, "DTC

P1705 THROTTLE POSITION SENSOR"

,

AT-116, "DTC P0720 VEHICLE SPEED SENSOR A/T

(REVOLUTION SENSOR)"

,

AT-165, "DTC P1721 VEHICLE SPEED SENSOR MTR"

.

NO

>> GO TO 3.

3.

CHECK A/T FLUID LEVEL

Check A/T fluid level. 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-53, "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