Nissan Titan A60. Manual - part 924

TM-84

< DTC/CIRCUIT DIAGNOSIS >

P1731 1ST ENGINE BRAKING

P1731 1ST ENGINE BRAKING

Description

INFOID:0000000006159357

Fail-safe function to prevent sudden decrease in speed by engine brake other than at "1" position.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000006159358

On Board Diagnosis Logic

INFOID:0000000006159359

• This is not an OBD-II self-diagnostic item.

• Diagnostic trouble code “P1731” with CONSULT-III or 13th judgment flicker without CONSULT-III is detected

under the following conditions.

- When TCM does not receive the proper voltage signal from the sensor.

- When TCM monitors ATF pressure switch 2 and solenoid monitor value, and detects as irregular when

engine brake of 1GR acts other than at 1 position.

Possible Cause

INFOID:0000000006159360

• Harness or connectors

(The sensor circuit is open or shorted.)

• Low coast brake solenoid valve

• ATF pressure switch 2

DTC Confirmation Procedure

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NOTE:

If “DTC Confirmation Procedure” has been previously preformed, always turn ignition switch “OFF”

and wait at least 10 seconds before performing the next test.

After the repair, perform the following procedure to confirm the malfunction is eliminated.

 WITH CONSULT-III

1. Turn ignition switch “ON”. (Do not start engine.)

2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.

3. Start engine.

4. Drive vehicle and maintain the following conditions for at least 2 consecutive seconds.

ENGINE SPEED: 1,200 rpm

SLCT LVR POSI: “1” position 

GEAR: 1st  

5. If DTC is detected, go to 

TM-84, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006159362

1.

CHECK INPUT SIGNALS

With CONSULT-III

1. Start the engine.

2. Select “SELECTION FROM MENU” in “DATA MONITOR” for "TRANSMISSION" with CONSULT-III"

3. Drive vehicle in the “1” position (1GR), and confirm the ON/OFF actuation of “ATF PRES SW 2” and "ON

OFF SOL".

Item name

Condition 

Display value

ON OFF SOL

Low coast brake engaged. Refer to 

TM-10

.

ON

Low coast brake disengaged. Refer to 

TM-10

.

OFF

ATF PRES SW 2

Low coast brake engaged. Refer to 

TM-10

ON

Low coast brake disengaged. Refer to 

TM-10

.

OFF

P1731 1ST ENGINE BRAKING

TM-85

< DTC/CIRCUIT DIAGNOSIS >

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2.

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

TM-101, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3.

DETECT MALFUNCTIONING ITEM

Check the following items:

• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG

OK

>> Replace the control valve with TCM. Refer to 

TM-197, "Control Valve with TCM"

.

NG

>> Repair or replace damaged parts.

4.

CHECK DTC

Perform “DTC Confirmation Procedure”.

• Refer to 

TM-84, "DTC Confirmation Procedure"

.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

Item name

Condition 

Display value

ON OFF SOL

Low coast brake engaged. Refer to 

TM-10

.

ON

Low coast brake disengaged. Refer to 

TM-10

.

OFF

ATF PRES SW 2

Low coast brake engaged. Refer to 

TM-10

.

ON

Low coast brake disengaged. Refer to 

TM-10

.

OFF

TM-86

< DTC/CIRCUIT DIAGNOSIS >

P1752 INPUT CLUTCH SOLENOID

P1752 INPUT CLUTCH SOLENOID

Description

INFOID:0000000006159363

Input clutch solenoid valve is controlled by the TCM in response to signals sent from the transmission range

switch, output speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then

be shifted to the optimum position.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000006159364

On Board Diagnosis Logic

INFOID:0000000006159365

• This is an OBD-II self-diagnostic item.

• Diagnostic trouble code “P1752” with CONSULT-III or 5th judgment flicker without CONSULT-III is detected

under the following conditions.

- When TCM detects an improper voltage drop when it tries to operate the solenoid valve.

- When TCM detects as irregular by comparing target value with monitor value.

Possible Cause

INFOID:0000000006159366

• Harness or connectors

(The solenoid circuit is open or shorted.)

• Input clutch solenoid valve 

DTC Confirmation Procedure

INFOID:0000000006159367

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”

and wait at least 10 seconds before performing the next test.

After the repair, perform the following procedure to confirm the malfunction is eliminated.

 WITH CONSULT-III

1. Turn ignition switch “ON”. (Do not start engine.)

2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.

3. Start engine.

4. Drive vehicle and maintain the following conditions for at least 5 consecutive seconds.

ACCELE POSI: 1.5/8 - 2.0/8

SLCT LVR POSI: “D” position 

GEAR: 3rd 

⇒ 4th (I/C ON/OFF) 

Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving

conditions required for this test.

5. If DTC is detected go to 

TM-86, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “With CONSULT-III”.

Diagnosis Procedure

INFOID:0000000006159368

1.

CHECK INPUT SIGNAL

With CONSULT-III

1. Turn ignition switch “ON”. 

2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.

3. Start the engine.

4. Read out the value of “I/C SOLENOID” while driving.

Item name

Condition 

Display value (Approx.)

I/C SOLENOID

Input clutch disengaged. Refer to 

TM-86

.

0.6 - 0.8 A

Input clutch engaged. Refer to 

TM-86

.

0  -  0.05  A

P1752 INPUT CLUTCH SOLENOID

TM-87

< DTC/CIRCUIT DIAGNOSIS >

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2.

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

TM-101, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3.

DETECT MALFUNCTIONING ITEM

Check the following items:

• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG

OK

>> Replace the control valve with TCM. Refer to 

TM-197, "Control Valve with TCM"

.

NG

>> Repair or replace damaged parts.

4.

CHECK DTC

Perform “DTC Confirmation Procedure”.

• Refer to 

TM-86, "DTC Confirmation Procedure"

.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

Item name

Condition 

Display value (Approx.)

I/C SOLENOID

Input clutch disengaged. Refer to 

TM-86

.

0.6 - 0.8 A

Input clutch engaged. Refer to 

TM-86

.

0  -  0.05  A