Infiniti M45 (Y34). Manual - part 50

TROUBLE DIAGNOSIS

AT-85

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-258, 

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

 .

ON vehicle

1. Ignition switch and starter

PG-2

, 

SC-9

2. Control linkage adjustment

AT-305

3. PNP switch

AT-110

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

ON vehicle

1. Ignition switch and starter

PG-2

, 

SC-9

2. Control linkage adjustment

AT-305

3. PNP switch

AT-110

Engine stall.

ON vehicle

1. Fluid level and state

AT-52

2. Engine speed signal

AT-121

3. Turbine revolution sensor

AT-160

4. Torque converter clutch solenoid valve

AT-123

5. CAN communication line

AT-103

6. Control valve assembly

AT-312

OFF vehicle

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

AT-52, "Fluid Con-

dition Check"

 .)

AT-342

Engine stalls when 
select lever shifted 
“N” 

→

 “D”, “R”.

ON vehicle

1. Fluid level and state

AT-52

2. Engine speed signal

AT-121

3. Turbine revolution sensor

AT-160

4. Torque converter clutch solenoid valve

AT-123

5. CAN communication line

AT-103

6. Control valve assembly

AT-312

OFF vehicle

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

AT-52, "Fluid Con-

dition Check"

 .)

AT-342

Engine speed does 
not return to idle.
Refer to 

AT-291, 

"Engine Speed 
Does Not Return to 
Idle"

 .

ON vehicle

1. Fluid level and state

AT-52

2. ATF pressure switch 5 and direct clutch solenoid valve

AT-242

, 

AT-199

3. ATF pressure switch 1 and front brake solenoid valve

AT-234

, 

AT-189

4. Accelerator pedal position sensor

AT-152

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

AT-116

, 

AT-165

6. CAN communication line

AT-103

7. Control valve assembly

AT-312

OFF vehicle

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

AT-52, 

"Fluid Condition Check"

 .)]

AT-342

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

AT-52, "Fluid Condition 

Check"

 .)

AT-374

Symptom

Condition

Diagnostic Item

Reference page

AT-86

TROUBLE DIAGNOSIS

TCM Input/Output Signal Reference Values

ACS004I0

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.

2.0V

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 (ATF pres-
sure switch 3)

–

–

5

B

Ground

Always

0V

6

L

CAN H

–

–

7

R

CAN L

–

–

8

B/R

A/T fluid tempera-
ture sensor 1

When ATF temperature 0

°

C (32

°

F)

3.2V

When ATF temperature 20

°

C (68

°

F)

2.5V

When ATF temperature 80

°

C (176

°

F)

0.8V

9

W/B

Power supply
(Memory back-up)

Always

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 2.0V 

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 2.0V 

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

0V

TROUBLE DIAGNOSIS

AT-87

D

E

F

G

H

I

J

K

L

M

A

B

AT

12

Y/R

Power supply 
(out)

–

Battery voltage

–

0V

13

W/L

Low coast brake 
solenoid valve

When 

vehicle 
cruises

When the solenoid valve is operating (when running in M1-1 
gear or M2-2 gear)

Battery voltage

When the solenoid valve is not operating (when running in 
“D”)

0V

14

B

Ground

Always

0V

15

B/W

SEL4

–

–

16

W/G

SEL1 (ATF pres-
sure switch 2)

–

–

17

Y/B

A/T fluid tempera-
ture sensor 2

When ATF temperature about 0

°

C (32

°

F)

3.2V

When ATF temperature about 20

°

C (68

°

F)

2.4V

When ATF temperature about 80

°

C (176

°

F)

0.65V

19

R

Front brake sole-
noid valve

When 

vehicle 
cruises

When the solenoid valve is operating (other than 4th gear)

More than 2.0V 

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

0V

20

Y

TCC solenoid 
valve

When  lock-up

More than 2.0V 

When not lock-up

0V

21

G

Direct clutch sole-
noid valve

When the solenoid valve is operating (1st gear or 5th gear)

More than 2.0V

When the solenoid valve is not operating (2nd gear, 3rd 
gear, or 4th gear)

0V

22

P/B

SEL2 (ATF pres-
sure switch 5)

–

–

23

PU/W

K-line (CONSULT-
II signal)

The terminal is connected to the data link connector for CONSULT-II.

24

B

Ground

Always

0V

26

G/Y

PSC2 (ATF pres-
sure switch 6)

When 

vehicle 
cruises

When high and low reverse clutch solenoid valve ON.

0V

When high and low reverse clutch solenoid valve OFF.

Battery voltage

27

Y/B

Vehicle speed 
sensor A/T (revo-
lution sensor)

When running at 20 km/h (12 MPH), use the CONSULT-II 
pulse frequency measuring function.

185 (Hz)

30

R/W

PNP switch 1

Selector lever in “P” position.

Battery voltage

Selector lever in “N” position.

Less than 2.5V 

31

OR

PNP switch 2

Selector lever in “P” position.

Battery voltage

Selector lever in “D” position.

Less than 2.5V 

33

G/R

Power supply

–

Battery voltage

–

0V

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

AT-88

TROUBLE DIAGNOSIS

35

B/Y

PSB2 (ATF pres-
sure switch 1)

When 

vehicle 
cruises

When front brake solenoid valve OFF.

Battery voltage

When front brake solenoid valve ON.

0V

36

L/Y

Turbine revolution 
sensor 1

When running at 50 km/h (31 MPH) in 4th gear with the 
closed throttle position signal OFF, use the CONSULT-II 
pulse frequency measuring function.

1.3 (kHz)

38

SB

PNP switch 3

Selector lever in “D” position.

Battery voltage

Selector lever in “R” position.

Less than 2.5V 

39

BR

PNP switch 4

Selector lever in “D” position.

Less than 2.5V 

Selector lever in “P” position.

Battery voltage

40

Y/G

DATA BIT1

–

–

41

R

Back-up lamp 
relay

Selector lever in “R” position.

0V

Selector lever in other positions.

Battery voltage

42

G/R

Power supply

–

Battery voltage

–

0V

45

PU

Turbine revolution 
sensor 2

When 

vehicle 
cruises

When running at 20 km/h (12 MPH) in 1st gear with the 
closed throttle position signal OFF, use the CONSULT-II 
pulse frequency measuring function.

1.3 (kHz)

46

B

Ground

Always

0V

47

G/W

PNP switch 3 
(monitor)

Selector lever in “D” position.

Battery voltage

Selector lever in “R” position.

Less than 2.5V 

48

B/W

PNP relay
(Starter relay)

Selector lever in “N”, “ P” positions.

Battery voltage

Selector lever in other positions.

0V

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)