Infiniti M45 (Y34). Manual - part 71

DTC P1730 A/T INTERLOCK

AT-169

D

E

F

G

H

I

J

K

L

M

A

B

AT

TCWA0122E

AT-170

DTC P1730 A/T INTERLOCK

TCM terminals and data are reference value. Measured between each terminal and ground.

TCWA0123E

DTC P1730 A/T INTERLOCK

AT-171

D

E

F

G

H

I

J

K

L

M

A

B

AT

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

4

P/L

SEL3 (ATF pres-
sure switch 3)

–

–

–

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 (4MPH) or 
faster in 1st gear or 2nd gear]

More than 2.0V

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

 0V

13

W/L

Low coast brake 
solenoid valve

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

16

W/G

SEL1 (ATF pres-
sure switch 2)

–

–

–

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

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)

–

–

–

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

35

B/Y

PSB2 (ATF pres-
sure switch 1)

When front brake solenoid valve OFF.

Battery voltage

When front brake solenoid valve ON.

0V

40

Y/G

DATA BIT1

–

–

–

AT-172

DTC P1730 A/T INTERLOCK

Judgement of A/T Interlock

ACS001CV

When A/T Interlock is judged to be malfunctioning, the vehicle should be fixed in 2nd gear and should be set in
a condition in which it can travel.
When one of the following fastening patterns is detected, the fail-safe function in correspondence with the indi-
vidual pattern should be executed.

A/T INTERLOCK COUPLING PATTERN TABLE

●

: NG, X: OK

Diagnostic Procedure

ACS001CW

1. 

SELF-DIAGNOSIS

 With CONSULT-II

1.

Start engine.

2.

Select “DATA MONITOR” mode for “A/T” with CONSULT-II.

3.

Drive vehicle.

 Without CONSULT-II

1.

Drive vehicle.

2.

Stop vehicle and turn ignition switch OFF.

3.

Turn ignition switch ON. (Do not start engine.)

4.

Perform self-diagnosis. Refer to 

AT-101, "TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS)"

 .

 OK or NG

OK

>> GO TO 2.

NG

>> Check low coast brake solenoid valve circuit and function.Refer to 

AT-220, "DTC P1772 LOW

COAST BRAKE SOLENOID VALVE"

 , 

AT-226, "DTC P1774 LOW COAST BRAKE SOLENOID

VALVE FUNCTION"

 .

2. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-167, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

Gear position

ATF pressure switch output

Fail-safe 

function

Clutch pressure output pattern after fail-safe func-

tion

SW3 

(I/C)

SW6 

(HLR/

C)

SW5 

(D/C)

SW1 

(FR/B)

SW2 

(LC/B)

I/C

HLR/C

D/C

FR/B

LC/B

L/U

A/T interlock 
coupling pat-
tern

3rd

–

X

X

–

●

Held in 

2nd gear

OFF

OFF

ON

OFF

OFF

OFF

4th

–

X

X

–

●

Held in 

2nd gear

OFF

OFF

ON

OFF

OFF

OFF

5th

X

X

–

X

●

Held in 

2nd gear

OFF

OFF

ON

OFF

OFF

OFF

SAT014K