Infiniti F50. Manual - part 49

TROUBLE DIAGNOSIS

AT-81

D

E

F

G

H

I

J

K

L

M

A

B

AT

Extremely large 
creep.

ON vehicle

1. Engine idle speed

EC-34

2. CAN communication line

AT-99

3. ATF pressure switch 5

AT-227

OFF vehicle

4. Torque converter (ATF condition “NG” only. Refer to 

AT-51, "Fluid con-

dition check"

 .)

AT-307

With selector lever 
in P position, vehi-
cle does not enter 
parking condition 
or, with selector 
lever in another 
position, parking 
condition is not 
cancelled.
Refer to 

AT-240, "In 

“P” Position, Vehi-
cle Moves When 
Pushed"

 .

ON vehicle

1. PNP switch

AT-105

2. Control linkage adjustment

AT-282

OFF vehicle

3. Parking pawl components (ATF condition “NG” only. Refer to 

AT-51, 

"Fluid condition check"

 .)

AT-299

Vehicle runs with 
transmission in “ P” 
position.

ON vehicle

1. PNP switch

AT-105

2. Fluid level and state

AT-51

3. Control linkage adjustment

AT-282

4. Control valve assembly

AT-289

OFF vehicle

5. Parking pawl components (ATF condition “NG” only. Refer to 

AT-51, 

"Fluid condition check"

 .)

AT-299

6. Gear system (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-299

Vehicle runs with 
transmission in “N” 
position.
Refer to 

AT-241, "In 

“N” Position, Vehi-
cle Moves"

 .

ON vehicle

1. PNP switch

AT-105

2. Fluid level and state

AT-51

3. Control linkage adjustment

AT-282

4. Control valve assembly

AT-289

OFF vehicle

5. Input clutch (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-326

6. Gear system (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-299

7. Direct clutch (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-337

8. Reverse brake (ATF condition “NG” only. Refer to 

AT-51, "Fluid condi-

tion check"

 .)

AT-307

9. Forward one-way clutch* (ATF condition “NG” only. Refer to 

AT-51, 

"Fluid condition check"

 .)

AT-307

10. Low coast brake* (ATF condition “NG” only. Refer to 

AT-51, "Fluid 

condition check"

 .)

AT-307

Symptom

Condition

Diagnostic Item

Reference page

AT-82

TROUBLE DIAGNOSIS

Vehicle cannot run 
in all positions.

ON vehicle

1. Fluid level and state

AT-51

2. Line pressure test

AT-52

3. PNP switch

AT-105

4. Control linkage adjustment

AT-282

5. Control valve assembly

AT-289

OFF vehicle

6. Oil pump assembly (ATF condition “NG” only. Refer to 

AT-51, "Fluid 

condition check"

 .)

AT-321

7. Gear system (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-299

8. Output shaft (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-307

With selector lever 
in D position, driv-
ing is not possible.

ON vehicle

1. Fluid level and state

AT-51

2. Line pressure test

AT-52

3. PNP switch

AT-105

4. Control linkage adjustment

AT-282

5. Control valve assembly

AT-289

OFF vehicle

6. Torque converter (ATF condition “NG” only. Refer to 

AT-51, "Fluid con-

dition check"

 .)

AT-307

7. Oil pump assembly (ATF condition “NG” only. Refer to 

AT-51, "Fluid 

condition check"

 .)

AT-321

8. 1st one-way clutch (ATF condition “NG” only. Refer to 

AT-51, "Fluid 

condition check"

 .)

AT-331

9. Gear system (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-299

10. Reverse brake (ATF condition “NG” only. Refer to 

AT-51, "Fluid condi-

tion check"

 .)

AT-307

11. Forward one-way clutch* (ATF condition “NG” only. Refer to 

AT-51, 

"Fluid condition check"

 .)

AT-307

12. Forward brake* (ATF condition “NG” only. Refer to 

AT-51, "Fluid con-

dition check"

 .)

AT-307

With selector lever 
in R position, driv-
ing is not possible.

ON vehicle

1. Fluid level and state

AT-51

2. Line pressure test

AT-52

3. PNP switch

AT-105

4. Control linkage adjustment

AT-282

5. Control valve assembly

AT-289

OFF vehicle

6. Gear system (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-299

7. Output shaft (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-307

8. Reverse brake (ATF condition “NG” only. Refer to 

AT-51, "Fluid condi-

tion check"

 .)

AT-307

Can not be 
changed to manual 
mode.
Refer to 

AT-270, 

"Cannot Be 
Changed to Manual 
Mode"

 .

ON vehicle

1. Manual mode switch

AT-215

2. Turbine revolution sensor

AT-152

3. CAN communication line

AT-99

Symptom

Condition

Diagnostic Item

Reference page

TROUBLE DIAGNOSIS

AT-83

D

E

F

G

H

I

J

K

L

M

A

B

AT

*: Parts behind Drum Support is impossible to perform inspection by disassembly. 

Engine does not 
start in “N” or “P” 
position.
Refer to 

AT-239, 

"Engine Cannot Be 
Started In “P” or “N” 
Position"

 .

ON vehicle

1. Ignition switch and starter

PG-2

, 

SC-22

2. Control linkage adjustment

AT-282

3. PNP switch

AT-105

Engine starts in 
positions other than 
“N” or “P”.

ON vehicle

1. Ignition switch and starter

PG-2

, 

SC-22

2. Control linkage adjustment

AT-282

3. PNP switch

AT-105

Engine stall.

ON vehicle

1. Fluid level and state

AT-51

2. Engine speed signal

AT-115

3. Turbine revolution sensor

AT-152

4. Torque converter clutch solenoid valve

AT-117

5. CAN communication line

AT-99

6. Control valve assembly

AT-289

OFF vehicle

7. Torque converter (ATF condition “NG” only. Refer to 

AT-51, "Fluid con-

dition check"

 .)

AT-307

Engine stalls when 
select lever shifted 
“N” 

→

 “D”, “R”.

ON vehicle

1. Fluid level and state

AT-51

2. Engine speed signal

AT-115

3. Turbine revolution sensor

AT-152

4. Torque converter clutch solenoid valve

AT-117

5. CAN communication line

AT-99

6. Control valve assembly

AT-289

OFF vehicle

7. Torque converter (ATF condition “NG” only. Refer to 

AT-51, "Fluid con-

dition check"

 .)

AT-307

Engine speed does 
not return to idle.
Refer to 

AT-268, 

"Engine Speed 
Does Not Return To 
Idle"

 .

ON vehicle

1. Fluid level and state

AT-51

2. ATF pressure switch 5 and direct clutch solenoid valve

AT-227

, 

AT-188

3. ATF pressure switch 1 and front brake solenoid valve

AT-219

, 

AT-179

4. Accelerator pedal position sensor

AT-144

5. Vehicle speed sensor A/T and vehicle speed sensor MTR

AT-110

, 

AT-157

6. CAN communication line

AT-99

7. Control valve assembly

AT-289

OFF vehicle

8. Front brake [brake band (ATF condition “NG” only. Refer to 

AT-51, 

"Fluid condition check"

 .)]

AT-307

9. Direct clutch (ATF condition “NG” only. Refer to 

AT-51, "Fluid condition 

check"

 .)

AT-337

Symptom

Condition

Diagnostic Item

Reference page

AT-84

TROUBLE DIAGNOSIS

TCM Input/Output Signal Reference Values

ECS0083I

TCM TERMINAL CONNECTOR LAYOUT 

TCM INSPECTION TABLE

Data are reference value and are measured between each terminal and ground.

SCIA0495E

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

1

B/Y

Line pressure 
solenoid valve

After warming up the engine, release your foot from the 
accelerator pedal.

2V

After warming up the engine, press the accelerator pedal all 
the way down.

0.7V

2

W

Power supply

–

Battery voltage

(A/T PV IGN 
relay)

Measure 3 seconds after switching “OFF” the ignition 
switch.

0V

3

W

Power supply
(A/T PV IGN 
relay)

–

Battery voltage

Measure 3 seconds after switching “OFF” the ignition 
switch.

0V

4

P/L

SEL3 (pressure 
switch 3)

–

–

–

5

B

Ground

–

–

–

6

LG/B

CAN H

–

–

–

7

P/B

CAN L

–

–

–

8

B/R

Fluid temperature 
sensor 1

When ATF temperature 0

°

C (32

°

F)

2.2V

When ATF temperature 20

°

C (68

°

F)

1.8V

When ATF temperature 80

°

C (176

°

F)

0.6V

9

W/B

Power supply
(Memory back-up)

–

Battery voltage

10

R/W

Input clutch sole-
noid valve

When 

vehicle 
cruises

When the solenoid valve operating (in 1st gear, 2nd gear, or 
3rd gear)

More than 2V 

When the solenoid valve is not operating (4th gear or 5th 
gear)

0V

11

R/L

High and low 
reverse clutch 
solenoid valve

When the solenoid valve operating [6 km/h (4 MPH) or 
faster in 1st gear or 2nd gear]

More than 2V 

When the solenoid valve is not operating [6 km/h (4 MPH) 
or slower in 1st gear or 3rd, 4th, or 5th gear]

0V