Infiniti M45 (Y34). Manual - part 84

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

AT-221

D

E

F

G

H

I

J

K

L

M

A

B

AT

Wiring Diagram — AT — LC/B

ACS004AA

TCWA0133E

AT-222

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

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

Diagnostic Procedure

ACS004AB

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode for “A/T” with CONSULT-II.

3.

Read out the value of “ON OFF SOL” while driving.

 Without CONSULT-II

1.

Start engine.

2.

 Check voltage between TCM connector and ground.

OK or NG

OK >> GO 

TO 

6.

NG

>> GO TO 2.

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

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

Item name

Condition 

Display value

ON OFF SOL

Low coast brake solenoid 
valve operates.

ON

Other conditions

OFF

SCIA4575E

Item

 Con-

nector 

No.

 Terminal 

No.

 Condition

Data 

(Approx.)

Low 

coast 

brake 

solenoid 

valve

 F103

 13 (W/L) 

- Ground

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

SCIA4578E

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

AT-223

D

E

F

G

H

I

J

K

L

M

A

B

AT

2. 

CHECK LOW COAST BRAKE SOLENOID VALVE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect A/T unit assembly harness connector at the trans-
mission right side.

3.

Check the resistance between terminal and ground.

OK or NG

OK >> GO 

TO 

5.

NG

>> GO TO 3.

3. 

CHECK TERMINAL CORD ASSEMBLY

1.

Remove oil pan. Refer to 

AT-312, "Control Valve Assembly"

 .

2.

Disconnect A/T unit assembly harness connector and control valve assembly harness connector.

3.

Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.

4.

If OK, check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 4.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

4. 

CHECK VALVE RESISTANCE

Check valve resistance

●

Refer to 

AT-224, "Component Inspection"

 .

OK or NG

OK >> GO 

TO 

6.

NG

>> Replace the control valve assembly. Refer to 

AT-312, "Control Valve Assembly"

 .

Solenoid valve

Connector No.

Terminal No. 

Resistance (Approx.)

Low coast brake 
solenoid valve

F27

2 - Ground

20 - 40 

Ω

SCIA1835E

Item

Connector No.

Terminal No. (Wire color)

Continuity

A/T unit assembly 
harness connector

F27

2 (B/R)

Yes

Control valve assem-
bly harness connec-
tor

F301

4 (B/R)

SCIA3092E

AT-224

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

5. 

CHECK POWER SOURCE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect TCM connector.

3.

Check continuity between A/T unit assembly harness connector
and TCM connector.

4.

If OK, check harness for short to ground and short to power.

5.

Reinstall any part removed.

OK or NG

OK

>> GO TO 6.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

6. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-220, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 7.

7. 

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.

Component Inspection

ACS004AC

LOW COAST BRAKE SOLENOID VALVE
Resistance Check

1.

Turn ignition switch OFF.

2.

Remove oil pan. Refer to 

AT-312, "Control Valve Assembly"

 .

3.

Disconnect control valve assembly harness connector.

4.

Check resistance between terminal and ground.

5.

If NG, replace control valve assembly. Refer to 

AT-312, "Control

Valve Assembly"

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F103

13 (W/L)

Yes

A/T unit assembly harness 
connector

F27

2 (W/L)

SCIA1836E

Solenoid Valve

Connector No.

Terminal No. 

(Wire color)

Resistance 

(Approx.)

Low coast brake sole-
noid valve

F301

4 (W) - Ground

20 - 40 

Ω

SCIA3093E