Nissan Titan. Manual - part 604

 

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Nissan Titan. Manual - part 604

 

 

P1772 LOW COAST BRAKE SOLENOID

TM-99

< 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-105, "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-201, "Control Valve with TCM"

.

NG

>> Repair or replace damaged parts.

4.

CHECK DTC

Perform “DTC Confirmation Procedure”.

• Refer to 

TM-98, "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-98

ON

Low coast brake disengaged. Refer to 

TM-98

OFF

TM-100

< DTC/CIRCUIT DIAGNOSIS >

P1774 LOW COAST BRAKE SOLENOID

P1774 LOW COAST BRAKE SOLENOID

Description

INFOID:0000000009885852

• Low coast brake solenoid valve is turned “ON” or “OFF” by the TCM in response to signals sent from the

transmission range switch, output speed sensor and accelerator pedal position sensor (throttle position sen-

sor). 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 malfunc-

tion such as control valve sticking, improper solenoid valve operation.

CONSULT Reference Value in Data Monitor Mode

INFOID:0000000009885853

On Board Diagnosis Logic

INFOID:0000000009885854

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

• Diagnostic trouble code “P1774” with CONSULT or 7th judgment flicker without CONSULT 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 2 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 2 is irregular

during releasing accelerator pedal. (Other than during shift change)

Possible Cause

INFOID:0000000009885855

• Harness or connectors

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

• Low coast brake solenoid valve 

• ATF pressure switch 2

DTC Confirmation Procedure

INFOID:0000000009885856

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

1. Start engine.

2. Accelerate vehicle to maintain the following conditions. 

Floor shift models:

SLCT LVR POSI: “1” or “2” position 

GEAR: “1st” or “2nd” (LC/B ON/OFF)

Column shift models:

MANUAL MODE SW: ON 

GEAR: “1st” or “2nd” (LC/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 “TRANSMISSION” with CONSULT. If DTC (P1774) is detected,

refer to 

TM-101, "Diagnosis Procedure"

.

If DTC (P1772) is detected, go to 

TM-98, "Diagnosis Procedure"

.

Item name

Condition 

Display value

ON OFF SOL

Low coast brake engaged. Refer to 

TM-100

ON

Low coast brake disengaged. Refer to 

TM-100

OFF

ATF PRES SW 2

Low coast brake engaged. Refer to 

TM-100

ON

Low coast brake disengaged. Refer to 

TM-100

OFF

P1774 LOW COAST BRAKE SOLENOID

TM-101

< DTC/CIRCUIT DIAGNOSIS >

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

 WITH GST

Follow the procedure “With CONSULT”.

Diagnosis Procedure

INFOID:0000000009885857

1.

CHECK INPUT SIGNALS

With CONSULT

1. Start the engine.

2. Select “SELECTION FROM MENU” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT.

3. Drive vehicle in the “1” or “2” position (“1

1

” or “2

2

” gear) and confirm the ON/OFF actuation of the “ATF

PRES SW 2” and “ON OFF SOL”.

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-105, "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-201, "Control Valve with TCM"

.

NG

>> Repair or replace damaged parts.

4.

CHECK DTC

Perform “DTC Confirmation Procedure”.

• Refer to 

TM-100, "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-100

ON

Low coast brake disengaged. Refer to 

TM-100

OFF

ATF PRES SW 2

Low coast brake engaged. Refer to 

TM-100

ON

Low coast brake disengaged. Refer to 

TM-100

OFF

TM-102

< DTC/CIRCUIT DIAGNOSIS >

P1815 M-MODE SWITCH

P1815 M-MODE SWITCH

Description

INFOID:0000000009885858

When an impossible pattern of switch signals is detected, this is judged to be an irregularity.

CONSULT Reference Value in Data Monitor Mode

INFOID:0000000009885859

On Board Diagnosis Logic

INFOID:0000000009885860

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

• Diagnostic trouble code “P1815” with CONSULT is detected when TCM monitors Manual mode, Non manual

mode, Up or Down switch signal, and detects as irregular when impossible input pattern occurs 1 second or

more.

Possible Cause

INFOID:0000000009885861

• Harness or connectors

(The switch circuits are open or shorted.)

• Mode select switch (Into A/T shift selector)

• Position select switch (Into A/T shift selector)

DTC Confirmation Procedure

INFOID:0000000009885862

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

1. Turn ignition switch ON.

2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT.

3. Start engine.

4. Move selector lever to “M” position.

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

MANU MODE SW: ON

6. If DTC is detected, go to 

TM-102, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009885863

1.

CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis. Is a malfunction in the CAN communication indicated in the results?
Yes or No

Yes

>> Check CAN communication line. Refer to 

TM-48, "Description"

.

No

>> GO TO 2.

2.

CHECK MANUAL MODE SWITCH CIRCUIT

Item name

Condition

Display Value

MANU MODE SW

Manual shift gate position (neutral)

ON

Other than the above

OFF

NON M-MODE SW

Manual shift gate position

OFF

Other than the above

ON

UP SW LEVER

Select lever: + side

ON

Other than the above

OFF

DOWN SW LEVER

Select lever: - side

ON

Other than the above

OFF

 

 

 

 

 

 

 

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