Infiniti F50. Manual - part 74

 

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Infiniti F50. Manual - part 74

 

 

DTC P1757 FRONT BRAKE SOLENOID VALVE

AT-181

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Diagnostic Procedure

ECS00871

1. 

CHECK FRONT BRAKE SOLENOID VALVE CIRCUIT

1.

Turn ignition switch to “OFF” position.

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 

4.

NG

>> GO TO 2.

2. 

CHECK TERMINAL CORD ASSEMBLY

1.

Remove oil pan. Refer to 

AT-289, "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 3.

NG

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

3. 

CHECK VALVE RESISTANCE

Check valve resistance

Refer to 

AT-183, "Component Inspection"

 .

OK or NG

OK >> GO 

TO 

4.

NG

>> Replace the control valve assembly. Refer to 

AT-289, "Control Valve Assembly"

 .

Solenoid valve

Connector No.

Terminal No. 

(Wire color)

Resistance (Approx.)

Front brake solenoid 
valve

F27

5 (R) - Ground

 3 - 9 

SCIA1839E

Item

Connector No.

Terminal No. (Wire color)

Continuity

A/T unit assembly 
harness connector

F27

5 (W/R)

Yes

Control valve assem-
bly harness connec-
tor

F301

8 (W/R)

SCIA3076E

AT-182

DTC P1757 FRONT BRAKE SOLENOID VALVE

4. 

CHECK POWER SOURCE CIRCUIT

1.

Turn ignition switch to “OFF” position.

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 5.

NG

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

5. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-179, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

6. 

PERFORM TCM INSPECTION

1.

Perform TCM input/output signal inspection.

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.

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F103

19 (R)

Yes

A/T unit assembly harness 
connector

F27

5 (R)

SCIA1840E

DTC P1757 FRONT BRAKE SOLENOID VALVE

AT-183

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Component Inspection

ECS00A33

FRONT BRAKE SOLENOID VALVE
Resistance check

1.

Turn ignition switch “OFF”.

2.

Remove oil pan. Refer to 

AT-289, "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-289, "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-184

DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION

DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION

PFP:31940

Description

ECS00872

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.

On Board Diagnosis Logic

ECS00873

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

ECS00874

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

Front brake solenoid valve 

ATF pressure switch 1

DTC Confirmation Procedure

ECS00875

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 to “OFF” position, 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-186, "Diagnostic Pro-

cedure"

 .

If DTC (P1757) is detected, go to 

AT-181, "Diagnostic Procedure"

 .

If DTC (P1841) is detected, go to 

AT-221, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “With CONSULT-II”.

SAT014K

 

 

 

 

 

 

 

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