Infiniti M45 (Y34). Manual - part 77

 

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Infiniti M45 (Y34). Manual - part 77

 

 

DTC P1757 FRONT BRAKE SOLENOID VALVE

AT-193

D

E

F

G

H

I

J

K

L

M

A

B

AT

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

ACS00499

FRONT 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"

 .

Operation Check

Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal 8 and ground.

Solenoid Valve

Connector No.

Terminal No. 

(Wire color)

Resistance 

(Approx.)

Front brake solenoid 
valve

F301

8 (Y) - Ground

3 - 9 

SCIA3077E

SCIA3079E

AT-194

DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION

DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION

PFP:31940

Description

ACS0049A

Front brake solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehi-
cle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be
shifted to the optimum position.

This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.

CONSULT-II Reference Value

ACS004PK

On Board Diagnosis Logic

ACS0049B

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “FR/B SOLENOID FNCT” with CONSULT-II or P1759 without CONSULT-II is
detected under the following conditions.

When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
ATF pressure switch 1 is irregular during depressing accelerator pedal. (Other than during shift change)

When TCM detects that relation between gear position and condition of ATF pressure switch 1 is irregular
during releasing accelerator pedal. (Other than during shift change)

Possible Cause

ACS0049C

Harness or connectors
(The solenoid and switch circuits are open or shorted.)

Front brake solenoid valve 

ATF pressure switch 1

DTC Confirmation Procedure

ACS0049D

CAUTION:

Always drive vehicle at a safe speed.

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.

Start engine.

2.

Accelerate vehicle to maintain the following condition.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position 
Gear position: 3rd 

Þ

 4th Gear (FR/B ON/OFF)   

3.

Perform step “2” again.

4.

Turn ignition switch OFF, then perform step “1” to “3” again.

5.

Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II. If DTC (P1759) is detected, refer to 

AT-196, "Diagnostic Pro-

cedure"

 .

If DTC (P1757) is detected, go to 

AT-191, "Diagnostic Proce-

dure"

 .

If DTC (P1841) is detected, go to 

AT-236, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “With CONSULT-II”.

Item name

Condition 

Display value

ATF PRES SW 1

Front brake solenoid valve operates. 

ON

Other conditions

OFF

SAT014K

DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION

AT-195

D

E

F

G

H

I

J

K

L

M

A

B

AT

Wiring Diagram — AT — FR/BF

ACS0049E

TCWA0128E

AT-196

DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION

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

Diagnostic Procedure

ACS0049F

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 (3rd 

Þ

 4th gear), and confirm

the ON/OFF actuation of the “ATF PRES SW 1”.

 Without CONSULT-II

1.

Start engine.

2.

Accelerate vehicle in the “D” position (3rd 

Þ

 4th gear).

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

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

35

B/Y

PSB2 (ATF pres-
sure switch 1)

When front brake solenoid valve OFF.

Battery voltage

When front brake solenoid valve ON.

0V

Item name

Condition 

Display value

ATF PRES SW 1

Front brake solenoid 
valve operates. 

ON

Other conditions

OFF

PCIA0067E

Solenoid valve

Connector 

No.

Terminal No. 

(Wire color)

Voltage

Front brake solenoid 
valve

OFF

F104

35 (B/Y) - Ground

Battery voltage

ON

Approx. 0 V

PCIA0066E

 

 

 

 

 

 

 

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