Infiniti M45 (Y34). Manual - part 83

DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION

AT-217

D

E

F

G

H

I

J

K

L

M

A

B

AT

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

Diagnostic Procedure

ACS004A5

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

Select “ECU INPUT SIGNALS” or “MAIN SIGNALS” in “DATA
MONITOR” mode for “A/T” with CONSULT-II.

3.

Accelerate vehicle in “D” position (2nd 

Þ

 3rd gear), and confirm

the ON/OFF actuation of the “ATF PRES SW 6”.

 Without CONSULT-II

1.

Start engine.

2.

Accelerate vehicle in “D” position (2nd 

Þ

 3rd gear).

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

11

R/L

High and low 
reverse clutch sole-
noid valve

When 
vehicle 
cruises

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

26

G/Y

PSC2 (ATF pres-
sure switch 6)

When high and low reverse clutch solenoid valve ON.

0V

When high and low reverse clutch solenoid valve OFF.

Battery voltage

Item name

Condition 

Display value

ATF PRES SW 6

High and low reverse 
clutch solenoid valve 
operates. 

OFF

Other conditions

ON

PCIA0067E

Solenoid valve

Connector 

No.

Terminal No. 

(Wire color)

Voltage

High and low reverse 
clutch solenoid valve

OFF

F104

26 (G/Y) - Ground

Battery voltage

ON

Approx. 0 V

PCIA0068E

AT-218

DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION

2. 

CHECK HARNESS BETWEEN TCM AND A/T UNIT ASSEMBLY HARNESS CONNECTOR

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 3.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

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.

5.

Reinstall any part removed.

OK or NG

OK

>> Replace the control valve assembly. Refer to 

AT-312,

"Control Valve Assembly"

 .

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F104

26 (G/Y)

Yes

A/T unit assembly harness 
connector

F26

4 (G/Y)

TCM

F103

11 (R/L)

Yes

A/T unit assembly harness 
connector

F27

3 (R/L)

SCIA3090E

Item

Connector No.

Terminal No. (Wire color)

Continuity

A/T unit assembly 
harness connector

F26

4 (Y)

Yes

Control valve assem-
bly harness connector

F302

11 (Y)

A/T unit assembly 
harness connector

F27

3 (B/W)

Yes

Control valve assem-
bly harness connector

F301

5 (B/W)

SCIA3091E

DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION

AT-219

D

E

F

G

H

I

J

K

L

M

A

B

AT

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-215, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 5.

5. 

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.

AT-220

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

DTC P1772 LOW COAST BRAKE SOLENOID VALVE

PFP:31940

Description

ACS004A6

Low coast brake solenoid valve is turned ON or OFF by the TCM in response to signals sent from the PNP
switch, vehicle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then
be shifted to the optimum position.

CONSULT-II Reference Value

ACS004PP

On Board Diagnosis Logic

ACS004A7

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “LC/B SOLENOID/CIRC” with CONSULT-II or P1772 without CONSULT-II is
detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

Possible Cause

ACS004A8

●

Harness or connectors
(The solenoid circuit is open or shorted.)

●

Low coast brake solenoid valve 

DTC Confirmation Procedure

ACS004A9

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

 WITH CONSULT-II

1.

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

2.

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

3.

Start engine.

4.

Maintain the following conditions for at least 5 consecutive sec-
onds.
Selector lever: “M” position 
Gear position: “M1-1st” or “M2-2nd” gear (LC/B ON/OFF)

5.

If DTC is detected, go to 

AT-222, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “With CONSULT-II”.

Item name

Condition 

Display value

ON OFF SOL

Low coast brake solenoid valve operates.

ON

Other conditions

OFF

SAT014K